WO2024225367A1 - Pump device and pump system - Google Patents
Pump device and pump system Download PDFInfo
- Publication number
- WO2024225367A1 WO2024225367A1 PCT/JP2024/016205 JP2024016205W WO2024225367A1 WO 2024225367 A1 WO2024225367 A1 WO 2024225367A1 JP 2024016205 W JP2024016205 W JP 2024016205W WO 2024225367 A1 WO2024225367 A1 WO 2024225367A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- purge gas
- motor
- tank
- piping
- liquid fuel
- Prior art date
Links
- 238000010926 purge Methods 0.000 claims abstract description 165
- 230000007797 corrosion Effects 0.000 claims abstract description 48
- 238000005260 corrosion Methods 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims description 154
- 239000000463 material Substances 0.000 claims description 103
- 239000007788 liquid Substances 0.000 claims description 78
- 239000000446 fuel Substances 0.000 claims description 76
- 239000002737 fuel gas Substances 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 10
- 238000001784 detoxification Methods 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 113
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 76
- 229910001873 dinitrogen Inorganic materials 0.000 description 62
- 229910021529 ammonia Inorganic materials 0.000 description 24
- 230000001681 protective effect Effects 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000003949 liquefied natural gas Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Definitions
- the present invention relates to a pump device and a pump system for pumping corrosive liquid fuel materials such as liquid ammonia.
- Submerged motor pumps have traditionally been used as pumping devices for pumping liquid fuel materials (see, for example, Patent Document 1).
- Conventional submerged motor pumps have a structure in which the stator and rotor of the motor are filled with liquid fuel, and are capable of pumping insulating liquids such as liquefied natural gas (LNG, LPG).
- LNG liquefied natural gas
- liquid ammonia which does not emit carbon dioxide when burned, has been attracting attention as a liquid fuel material.
- liquid ammonia is corrosive, but pumping corrosive liquid fuel materials such as liquid ammonia has not been taken into consideration in conventional pump devices.
- the motor of the pump device is changed to a canned motor (see Patent Document 2, for example), in which the stator and rotor of the motor are sealed like a can.
- the pump device In a pump device using a canned motor, the pump device is installed in liquid ammonia, etc., so it is necessary to protect the electrical system components of the pump device from corrosion by liquid ammonia, etc. In addition, if liquid ammonia, etc., enters the storage room for electrical system components such as the motor winding room of the pump device, it is necessary to detect this. Furthermore, even if liquid ammonia, etc., enters the storage room for electrical system components of the pump device, it is necessary to protect the electrical system components from corrosion by liquid ammonia, etc.
- the present invention has been made against the above background.
- the object of the present invention is to provide a pump device that can detect when corrosive liquid fuel material has entered the storage chamber for electrical system components of the pump device and can protect the electrical system components of the pump device from corrosion.
- One aspect of the present invention is a pump device that pumps liquid fuel material from inside a tank in which the corrosive liquid fuel material is stored, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor casing that covers a motor of the pump device inside the tank, a motor that is installed within the motor casing and generates a driving force for the pump device, a motor cable that is connected to a power supply device that is installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and connected to the motor casing inside the tank, and a purge pipe that is installed outside the tank.
- the purge gas piping is connected to the gas supply unit and through which the purge gas supplied from the purge gas supply unit flows; a pressure adjustment unit is installed in the purge gas piping and maintains a constant pressure inside the purge gas piping; a pressure sensor is installed in the purge gas piping and detects changes in the pressure of the purge gas inside the purge gas piping; and a flow rate sensor is installed in the purge gas piping and detects changes in the flow rate of the purge gas inside the purge gas piping.
- the purge gas piping is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping.
- a pump system comprising a tank for storing a corrosive liquid fuel material, and a pump device for pumping the liquid fuel material from the tank, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor casing that covers a motor of the pump device inside the tank, a motor that is installed within the motor casing and generates a driving force for the pump device, a motor cable that is connected to a power supply device that is installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and ...
- the motor casing is provided with a purge gas pipe connected to a purge gas supply unit installed in the motor casing and through which purge gas supplied from the purge gas supply unit flows, a pressure adjustment unit installed in the purge gas pipe and maintaining a constant pressure inside the purge gas pipe, a pressure sensor installed in the purge gas pipe and detecting a change in the pressure of the purge gas inside the purge gas pipe, and a flow rate sensor installed in the purge gas pipe and detecting a change in the flow rate of the purge gas inside the purge gas pipe.
- the purge gas pipe is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas pipe through the other of the motor cable protection tube or the tank internal piping.
- FIG. 1 is an explanatory diagram showing a configuration of a pump device according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the pump device according to the embodiment of the present invention.
- FIG. 3 is an explanatory diagram showing the flow of nitrogen gas (when the ammonia concentration is less than a threshold value) in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing the flow of nitrogen gas (when the ammonia concentration is equal to or higher than a threshold) in the embodiment of the present invention.
- the pump device of the present invention is a pump device that pumps up a liquid fuel material from inside a tank in which a corrosive liquid fuel material is stored, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor that generates a driving force for the pump device inside the tank, a motor casing that covers the motor, a motor cable that is connected to a power supply device installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and a purge gas supply unit that is connected to a purge gas supply unit installed outside the tank.
- the purge gas piping includes a purge gas piping through which the purge gas supplied from flows, a pressure adjustment unit installed in the purge gas piping to keep the pressure inside the purge gas piping constant, a pressure sensor installed in the purge gas piping to detect changes in the pressure of the purge gas inside the purge gas piping, and a flow rate sensor installed in the purge gas piping to detect changes in the flow rate of the purge gas inside the purge gas piping.
- the purge gas piping is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping.
- the pump device is installed inside the tank that stores the corrosive liquid fuel material (e.g., liquid ammonia), but since the motor of the pump device is covered by a motor casing made of a material that is corrosion-resistant to the liquid fuel material (e.g., stainless steel), the pump device can be appropriately protected from corrosion.
- the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores the corrosive liquid fuel material, but since the motor cable is covered by a motor cable protective tube made of a material that is corrosion-resistant to the liquid fuel material, the motor cable can be appropriately protected from corrosion.
- the purge gas (e.g., nitrogen gas, etc.) supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing through the other of the motor cable protection tube or the tank internal piping to the purge gas piping.
- the purge gas can be circulated using the motor cable protection tube and the tank internal piping, so the inside of the motor casing can be purged more effectively with the purge gas than when the purge gas cannot be circulated. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the pump device can be appropriately protected from corrosion by purging.
- the inside of the motor cable protection tube can also be effectively purged with the purge gas. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the motor cable can be appropriately protected from corrosion by purging.
- the pressure inside the purge gas piping is kept constant by the pressure adjustment unit. If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (e.g., ammonia gas) is generated from the liquid fuel material, and the pressure inside the purge gas piping changes.
- the pressure sensor can detect the change in the pressure of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
- the flow sensor can detect the change in the flow rate of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
- the pump device of the present invention may also include a detector that is installed in the purge gas piping and detects whether fuel gas vaporized from the liquid fuel material has entered the inside of the purge gas piping.
- a detector can detect whether or not fuel gas vaporized from the liquid fuel material has gotten into the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
- the pump device of the present invention may also include a detoxification device that is connected to the purge gas piping and that detoxifies the fuel gas vaporized from the liquid fuel material that has been mixed inside the purge gas piping.
- the decontamination device can decontaminate the fuel gas (such as ammonia gas) that has evaporated from the liquid fuel material that has gotten into the purge gas piping, rendering it harmless.
- the fuel gas such as ammonia gas
- the pump system of the present invention includes a tank for storing a corrosive liquid fuel material, and a pump device for pumping the liquid fuel material from the tank, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor that generates a driving force for the pump device inside the tank, a motor casing that covers the motor, a motor cable that is connected to a power supply device installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and a purge gas supply unit that is installed outside the tank.
- the purge gas supply system includes a purge gas pipe through which purge gas supplied from the purge gas supply unit flows, a pressure adjustment unit installed in the purge gas pipe to keep the pressure inside the purge gas pipe constant, a pressure sensor installed in the purge gas pipe to detect changes in the pressure of the purge gas inside the purge gas pipe, and a flow rate sensor installed in the purge gas pipe to detect changes in the flow rate of the purge gas inside the purge gas pipe.
- the purge gas pipe is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas pipe through the other of the motor cable protection tube or the tank internal piping.
- the pump device is installed inside a tank that stores a corrosive liquid fuel material (e.g., liquid ammonia), but since the motor is covered by a motor casing made of a material that is corrosion-resistant to the liquid fuel material (e.g., stainless steel), the pump device can be adequately protected from corrosion.
- the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores the corrosive liquid fuel material, but since the motor cable is covered by a motor cable protective tube made of a material that is corrosion-resistant to the liquid fuel material, the motor cable can be adequately protected from corrosion.
- the purge gas (such as nitrogen gas) supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing through the other of the motor cable protection tube or the tank internal piping to the purge gas piping.
- the purge gas can be circulated using the motor cable protection tube and the tank internal piping, so the inside of the motor casing can be purged more effectively with the purge gas than when the purge gas cannot be circulated. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the pump device can be appropriately protected from corrosion by purging.
- the inside of the motor cable protection tube can also be effectively purged with the purge gas. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the motor cable can be appropriately protected from corrosion by purging.
- the pressure inside the purge gas piping is kept constant by the pressure adjustment unit. If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (such as ammonia gas) is generated from the liquid fuel material, and the pressure inside the purge gas piping changes.
- the pressure sensor can detect the change in purge gas pressure inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
- the flow sensor can detect the change in the flow rate of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
- liquid fuel material gets inside the motor of a pump device, this can be detected and the pump device can be protected from corrosion.
- FIG. 1 is an explanatory diagram showing the configuration of a pump system according to this embodiment
- FIG. 2 is a cross-sectional view of the pump device according to this embodiment.
- the pump system 1 includes a tank 2 that stores liquid ammonia (a corrosive liquid fuel material), and a pump device 3 that is installed inside the tank 2 and pumps up the liquid ammonia.
- liquid ammonia a corrosive liquid fuel material
- the tank 2 includes a tank casing 4 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia, and the pump device 3 includes a motor casing 5 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia.
- a tank casing 4 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia
- the pump device 3 includes a motor casing 5 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia.
- a motor (stator) 6 that generates the driving force for the pump device 3
- a motor (rotor) 6 a rotating shaft 7 that is rotated by the driving force of the motor (rotor) 6'
- a pair of upper and lower bearings 8 that rotatably support the rotating shaft 7.
- the motor (stator) 6 and the motor (rotor) 6' each have a canned motor structure that is sealed so as not to come into contact with liquid.
- acceleration sensors 9 that measure high-frequency vibrations of the bearings 8 are installed near the pair of upper and lower bearings 8.
- a power supply unit 10 that supplies power to the pump device 3, and two measuring devices 11 (upper measuring device 11 and lower measuring device 11) to which output signals from a pair of upper and lower acceleration sensors 9 are input.
- a motor cable 12 that supplies power from the power supply unit 10 is connected to the motor (stator) 6, and a sensor cable 13 that transmits output signals to the measuring devices 11 (upper measuring device 11 and lower measuring device 11) is connected to each of the pair of upper and lower acceleration sensors 9.
- the motor cable and sensor cable 13 are covered by a motor cable protective tube 14 and a sensor cable protective tube 15, respectively, which are made of a material (such as stainless steel) that is resistant to corrosion by liquid ammonia.
- the sensor cable protective tube 15 can also be called an in-tank piping.
- a nitrogen tank 16 for supplying nitrogen gas, which is a purge gas, and a nitrogen gas pipe 17 through which the nitrogen gas supplied from the nitrogen tank 16 flows.
- the nitrogen tank 16 corresponds to the purge gas supply unit of the present invention
- the nitrogen gas pipe 17 corresponds to the purge gas pipe of the present invention.
- the nitrogen gas pipe 17 is connected to the motor cable protective tube 14 and the sensor cable protective tube 15, and is configured so that the nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas pipe 17 through the sensor cable protective tube 15 to the inside of the motor casing 5, and is returned from the inside of the motor casing 5 through the motor cable protective tube 14 to the nitrogen gas pipe 17.
- the nitrogen gas pipe 17 is provided with a pressure adjustment unit 18 that keeps the pressure inside the nitrogen gas pipe 17 constant, a pressure sensor 19 that detects changes in the pressure of the nitrogen gas inside the nitrogen gas pipe 17, and a flow rate sensor 20 that detects changes in the flow rate of the nitrogen gas inside the nitrogen gas pipe 17.
- the pressure adjustment unit 18 can be composed of, for example, a pressure reducing valve.
- the nitrogen gas pipe 17 is also provided with an ammonia detector 21 that detects whether ammonia gas vaporized from liquid ammonia is mixed inside the nitrogen gas pipe 17.
- the ammonia detector 21 can detect that ammonia gas is mixed inside the nitrogen gas pipe 17, for example, when the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 becomes equal to or higher than a predetermined threshold value.
- an ammonia abatement pipe 22 for abating ammonia gas is branched off from the nitrogen gas pipe 17.
- the ammonia abatement pipe 22 is connected to an ammonia abatement device 23 that abats ammonia gas vaporized from the liquid ammonia mixed inside the nitrogen gas pipe 17.
- a water supply pipe 24 for supplying water (washing water) used to detoxify the ammonia gas
- a drain pipe 25 for discharging the ammonia water produced by the ammonia gas detoxification
- an exhaust pipe 26 for discharging the nitrogen gas from which the ammonia gas has been removed.
- a water pump 27 is provided on the water supply pipe for sending the water (washing water) used to detoxify the ammonia gas to the ammonia detoxification device 23.
- the ammonia abatement pipe 22 is provided with an automatic valve 28 that is controlled to be open when ammonia gas is being abatement treated, and a blower 29 for sending nitrogen gas mixed with ammonia gas to the ammonia abatement device 23.
- the automatic valve 28 of the ammonia abatement pipe 22 is controlled to be closed when ammonia gas is not being abatement treated.
- the nitrogen gas pipe 17 is provided with an automatic valve 30 that is controlled to be closed when ammonia gas is being abatement treated.
- the automatic valve 30 of the nitrogen gas pipe 17 is controlled to be open when ammonia gas is not being abatement treated.
- FIGS. 3 and 4 are explanatory diagrams showing the flow of nitrogen gas in the pump system 1 of this embodiment.
- the flow of nitrogen gas is indicated by arrows.
- the ammonia detector 21 does not detect that ammonia gas is mixed inside the nitrogen gas pipe 17, that is, when the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 is below a predetermined threshold value, the automatic valve 30 of the nitrogen gas pipe 17 is controlled to be open, and the automatic valve 28 of the ammonia abatement pipe 22 is controlled to be closed.
- the ammonia detector 21 detects that ammonia gas has been mixed inside the nitrogen gas pipe 17, that is, if the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 is equal to or higher than a predetermined threshold value, the automatic valve 30 in the nitrogen gas pipe 17 is controlled to close, and the automatic valve 28 in the ammonia abatement pipe 22 is controlled to open.
- the pump device 3 is installed inside the tank 2 in which corrosive liquid ammonia is stored, but since the motor (stator) 6 is covered by the motor casing 5 made of a material (e.g., stainless steel) that is corrosion-resistant to liquid ammonia, the pump device 3 can be appropriately protected from corrosion.
- the motor cable 12 that supplies power to the motor 6 of the pump device 3 is also installed inside the tank 2 in which liquid ammonia is stored, but since the motor cable 12 is covered by the motor cable protective tube 14 made of a material that is corrosion-resistant to liquid ammonia, the motor cable 12 can be appropriately protected from corrosion.
- nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas pipe 17 to the inside of the motor casing 5 through one of the motor cable protection pipe 14 or the tank internal pipe 15, and is returned from the inside of the motor casing 5 to the nitrogen gas pipe 17 through the other of the motor cable protection pipe 14 or the tank internal pipe 15.
- nitrogen gas can be circulated using the motor cable protection pipe 14 and the tank internal pipe 15, so the inside of the motor casing 5 can be purged more effectively with nitrogen gas than when nitrogen gas cannot be circulated. Therefore, even if liquid ammonia gets into the inside of the motor casing 5, the motor (stator) 6 can be appropriately protected from corrosion by purging.
- the inside of the motor cable protection pipe 14 can also be effectively purged with nitrogen gas. Therefore, even if liquid ammonia gets into the inside of the motor casing 5, the motor cable 12 can be appropriately protected from corrosion by purging.
- the pressure inside the nitrogen gas piping 17 is kept constant by the pressure adjustment unit 18. If liquid ammonia gets into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15, ammonia gas is vaporized from the liquid ammonia, and the pressure inside the nitrogen gas piping 17 changes.
- the pressure sensor 19 can detect the change in the pressure of the nitrogen gas inside the nitrogen gas piping 17, and thereby it can be detected that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15.
- the flow sensor 20 can detect the change in the flow rate of nitrogen gas inside the nitrogen gas piping 17, making it possible to detect that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank internal piping 15.
- the ammonia detector 21 can detect whether ammonia gas vaporized from liquid ammonia has got into the nitrogen gas piping 17, and thus it can detect that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15.
- the ammonia detoxification device 23 can detoxify the ammonia gas that has evaporated from the liquid ammonia that has gotten into the nitrogen gas piping 17, making it harmless.
- the pump device of the present invention has the effect of being able to detect when liquid fuel material has entered the storage chamber for the pump device's electrical system components and protecting the pump device from corrosion, and is useful as a canned motor pump for liquid ammonia, etc.
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A pump device (3) is provided with a motor casing (5) having corrosion resistance, and a motor cable (12) is covered with a motor cable protection tube (14) having corrosion resistance. The pump device (3) is provided with an in-tank pipe (15) having corrosion resistance. A purge gas pipe (17) through which a purge gas supplied from a purge gas supply unit (16) flows is connected to the motor cable protection tube (14) and the in-tank pipe (15), and is configured such that the purge gas circulates inside the pump device (3). The purge gas pipe (17) is provided with a pressure adjustment unit (18), a pressure sensor (19), and a flow rate sensor (20).
Description
本発明は、液体アンモニアなどの腐食性を有する液体燃料材料を汲み上げるためのポンプ装置およびポンプシステムに関する。
The present invention relates to a pump device and a pump system for pumping corrosive liquid fuel materials such as liquid ammonia.
従来から、液体燃料材料を汲み上げるポンプ装置として、サブマージドモータポンプが用いられている（例えば特許文献１参照）。従来のサブマージドモータポンプは、モータの固定子と回転子が液体燃料で満たされる構造であり、液化天然ガス（ＬＮＧ、ＬＰＧ）などの絶縁性の有る液体を汲み上げることが可能であった。
Submerged motor pumps have traditionally been used as pumping devices for pumping liquid fuel materials (see, for example, Patent Document 1). Conventional submerged motor pumps have a structure in which the stator and rotor of the motor are filled with liquid fuel, and are capable of pumping insulating liquids such as liquefied natural gas (LNG, LPG).
近年、液体燃料材料として、燃焼しても二酸化炭素を排出しない液体アンモニアが注目されている。液体アンモニアは、液化天然ガス（ＬＮＧ、ＬＰＧ）と異なり、腐食性を有するが、従来のポンプ装置においては、液体アンモニアなどの腐食性を有する液体燃料材料を汲み上げることについて、考慮がされていない。液体アンモニア等の腐食性を有する液体燃料材料を液化天然ガス（ＬＮＧ、ＬＰＧ）などの従来の液体燃料材料と同様に汲み上げる場合には、ポンプ装置のモータをキャンドモータ（例えば特許文献２参照）と呼ばれるモータの固定子と回転子がそれぞれ缶詰のように密閉されたモータに変更する。キャンドモータを用いたポンプ装置では、ポンプ装置が液体アンモニア等の中に設置されるため、ポンプ装置の電気系統部品を液体アンモニア等による腐食から保護する必要がある。また、液体アンモニア等がポンプ装置のモータ巻線室などの電気系統部品の収納室に入り込む事態が起きた場合には、そのこと検知する必要がある。さらに、液体アンモニア等がポンプ装置の電気系統部品の収納室に入り込む事態が起きた場合であっても、電気系統部品を液体アンモニア等による腐食から保護する必要がある。
In recent years, liquid ammonia, which does not emit carbon dioxide when burned, has been attracting attention as a liquid fuel material. Unlike liquefied natural gas (LNG, LPG), liquid ammonia is corrosive, but pumping corrosive liquid fuel materials such as liquid ammonia has not been taken into consideration in conventional pump devices. When pumping corrosive liquid fuel materials such as liquid ammonia in the same way as conventional liquid fuel materials such as liquefied natural gas (LNG, LPG), the motor of the pump device is changed to a canned motor (see Patent Document 2, for example), in which the stator and rotor of the motor are sealed like a can. In a pump device using a canned motor, the pump device is installed in liquid ammonia, etc., so it is necessary to protect the electrical system components of the pump device from corrosion by liquid ammonia, etc. In addition, if liquid ammonia, etc., enters the storage room for electrical system components such as the motor winding room of the pump device, it is necessary to detect this. Furthermore, even if liquid ammonia, etc., enters the storage room for electrical system components of the pump device, it is necessary to protect the electrical system components from corrosion by liquid ammonia, etc.
本発明は、上記背景の下でなされたものである。本発明の目的は、腐食性を有する液体燃料材料がポンプ装置の電気系統部品の収納室に入り込む事態が起きた場合に、そのこと検知することができ、ポンプ装置の電気系統部品を腐食から保護することのできるポンプ装置を提供することにある。
The present invention has been made against the above background. The object of the present invention is to provide a pump device that can detect when corrosive liquid fuel material has entered the storage chamber for electrical system components of the pump device and can protect the electrical system components of the pump device from corrosion.
本発明の一の態様は、ポンプ装置であり、このポンプ装置は、腐食性を有する液体燃料材料が溜められるタンクの内部から液体燃料材料を汲み上げるポンプ装置において、ポンプ装置は、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてポンプ装置のモータを覆うモータケーシングと、モータケーシング内に設置され、ポンプ装置の駆動力を発生させるモータと、タンクの外部に設置される電源装置に接続され、電源装置からモータに電力を供給するモータケーブルと、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーブルを覆うモータケーブル保護管と、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーシングに接続されるタンク内配管と、タンクの外部に設置されるパージガス供給部に接続され、パージガス供給部から供給されるパージガスが流れるパージガス配管と、パージガス配管に設置され、パージガス配管の内部の圧力を一定に保つ圧力調整部と、パージガス配管に設置され、パージガス配管の内部におけるパージガスの圧力の変化を検知する圧力センサと、パージガス配管に設置され、パージガス配管の内部におけるパージガスの流量の変化を検知する流量センサと、を備え、パージガス配管は、モータケーブル保護管およびタンク内配管と接続され、パージガス供給部から供給されるパージガスが、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻されるように構成されている。
One aspect of the present invention is a pump device that pumps liquid fuel material from inside a tank in which the corrosive liquid fuel material is stored, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor casing that covers a motor of the pump device inside the tank, a motor that is installed within the motor casing and generates a driving force for the pump device, a motor cable that is connected to a power supply device that is installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and connected to the motor casing inside the tank, and a purge pipe that is installed outside the tank. The purge gas piping is connected to the gas supply unit and through which the purge gas supplied from the purge gas supply unit flows; a pressure adjustment unit is installed in the purge gas piping and maintains a constant pressure inside the purge gas piping; a pressure sensor is installed in the purge gas piping and detects changes in the pressure of the purge gas inside the purge gas piping; and a flow rate sensor is installed in the purge gas piping and detects changes in the flow rate of the purge gas inside the purge gas piping. The purge gas piping is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping.
本発明の別の態様は、ポンプシステムであり、このポンプシステムは、腐食性を有する液体燃料材料が溜められるタンクと、タンクから液体燃料材料を汲み上げるポンプ装置と、を備えるポンプシステムにおいて、ポンプ装置は、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてポンプ装置のモータを覆うモータケーシングと、モータケーシング内に設置され、ポンプ装置の駆動力を発生させるモータと、タンクの外部に設置される電源装置に接続され、電源装置からモータに電力を供給するモータケーブルと、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーブルを覆うモータケーブル保護管と、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーシングに接続されるタンク内配管と、タンクの外部に設置されるパージガス供給部に接続され、パージガス供給部から供給されるパージガスが流れるパージガス配管と、パージガス配管に設置され、パージガス配管の内部の圧力を一定に保つ圧力調整部と、パージガス配管に設置され、パージガス配管の内部におけるパージガスの圧力の変化を検知する圧力センサと、パージガス配管に設置され、パージガス配管の内部におけるパージガスの流量の変化を検知する流量センサと、を備え、パージガス配管は、モータケーブル保護管およびタンク内配管と接続され、パージガス供給部から供給されるパージガスが、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻されるように構成されている。
Another aspect of the present invention is a pump system comprising a tank for storing a corrosive liquid fuel material, and a pump device for pumping the liquid fuel material from the tank, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor casing that covers a motor of the pump device inside the tank, a motor that is installed within the motor casing and generates a driving force for the pump device, a motor cable that is connected to a power supply device that is installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and ... tank external piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank. The motor casing is provided with a purge gas pipe connected to a purge gas supply unit installed in the motor casing and through which purge gas supplied from the purge gas supply unit flows, a pressure adjustment unit installed in the purge gas pipe and maintaining a constant pressure inside the purge gas pipe, a pressure sensor installed in the purge gas pipe and detecting a change in the pressure of the purge gas inside the purge gas pipe, and a flow rate sensor installed in the purge gas pipe and detecting a change in the flow rate of the purge gas inside the purge gas pipe. The purge gas pipe is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas pipe through the other of the motor cable protection tube or the tank internal piping.
以下に説明するように、本発明には他の態様が存在する。したがって、この発明の開示は、本発明の一部の態様の提供を意図しており、ここで記述され請求される発明の範囲を制限することは意図していない。
There are other aspects of the invention, as described below. Accordingly, this disclosure is intended to provide some aspects of the invention, and is not intended to limit the scope of the invention as described and claimed herein.
以下に本発明の詳細な説明を述べる。ただし、以下の詳細な説明と添付の図面は発明を限定するものではない。
The present invention is described in detail below. However, the following detailed description and the accompanying drawings are not intended to limit the invention.
本発明のポンプ装置は、腐食性を有する液体燃料材料が溜められるタンクの内部から液体燃料材料を汲み上げるポンプ装置において、ポンプ装置は、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてポンプ装置の駆動力を発生させるモータと、モータを覆うモータケーシングと、タンクの外部に設置される電源装置に接続され、電源装置からモータに電力を供給するモータケーブルと、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーブルを覆うモータケーブル保護管と、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーシングに接続されるタンク内配管と、タンクの外部に設置されるパージガス供給部に接続され、パージガス供給部から供給されるパージガスが流れるパージガス配管と、パージガス配管に設置され、パージガス配管の内部の圧力を一定に保つ圧力調整部と、パージガス配管に設置され、パージガス配管の内部におけるパージガスの圧力の変化を検知する圧力センサと、パージガス配管に設置され、パージガス配管の内部におけるパージガスの流量の変化を検知する流量センサと、を備え、パージガス配管は、モータケーブル保護管およびタンク内配管と接続され、パージガス供給部から供給されるパージガスが、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻されるように構成されている。
The pump device of the present invention is a pump device that pumps up a liquid fuel material from inside a tank in which a corrosive liquid fuel material is stored, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor that generates a driving force for the pump device inside the tank, a motor casing that covers the motor, a motor cable that is connected to a power supply device installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and a purge gas supply unit that is connected to a purge gas supply unit installed outside the tank. The purge gas piping includes a purge gas piping through which the purge gas supplied from flows, a pressure adjustment unit installed in the purge gas piping to keep the pressure inside the purge gas piping constant, a pressure sensor installed in the purge gas piping to detect changes in the pressure of the purge gas inside the purge gas piping, and a flow rate sensor installed in the purge gas piping to detect changes in the flow rate of the purge gas inside the purge gas piping. The purge gas piping is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping.
この構成によれば、腐食性を有する液体燃料材料（例えば、液体アンモニアなど）が溜められるタンクの内部にポンプ装置が設置されるが、液体燃料材料に対して耐腐食性を有する材料（例えば、ステンレスなど）で構成されるモータケーシングによってポンプ装置のモータが覆われているため、ポンプ装置を腐食から適切に保護することができる。この場合、ポンプ装置のモータに電力を供給するモータケーブルも、腐食性を有する液体燃料材料が溜められるタンクの内部に設置されることになるが、液体燃料材料に対して耐腐食性を有する材料で構成されるモータケーブル保護管によってモータケーブルが覆われているため、モータケーブルを腐食から適切に保護することができる。
With this configuration, the pump device is installed inside the tank that stores the corrosive liquid fuel material (e.g., liquid ammonia), but since the motor of the pump device is covered by a motor casing made of a material that is corrosion-resistant to the liquid fuel material (e.g., stainless steel), the pump device can be appropriately protected from corrosion. In this case, the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores the corrosive liquid fuel material, but since the motor cable is covered by a motor cable protective tube made of a material that is corrosion-resistant to the liquid fuel material, the motor cable can be appropriately protected from corrosion.
また、この構成によれば、パージガス供給部から供給されるパージガス（例えば、窒素ガスなど）が、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻される。このようにモータケーブル保護管とタンク内配管を利用して、パージガスを循環させることができるので、パージガスを循環させることができない場合に比べて、モータケーシングの内部をパージガスによって効果的にパージすることができる。したがって、液体燃料材料がモータケーシングの内部に入り込む事態が起きたとしても、パージによってポンプ装置を腐食から適切に保護することができる。また、この場合、パージガスを循環させることができるので、モータケーブル保護管の内部もパージガスによって効果的にパージすることができる。したがって、液体燃料材料がモータケーシングの内部に入り込む事態が起きたとしても、パージによってモータケーブルを腐食から適切に保護することができる。
Also, according to this configuration, the purge gas (e.g., nitrogen gas, etc.) supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing through the other of the motor cable protection tube or the tank internal piping to the purge gas piping. In this way, the purge gas can be circulated using the motor cable protection tube and the tank internal piping, so the inside of the motor casing can be purged more effectively with the purge gas than when the purge gas cannot be circulated. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the pump device can be appropriately protected from corrosion by purging. Also, in this case, since the purge gas can be circulated, the inside of the motor cable protection tube can also be effectively purged with the purge gas. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the motor cable can be appropriately protected from corrosion by purging.
さらに、この構成によれば、圧力調整部によって、パージガス配管の内部の圧力を一定に保たれている。液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合には、液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）が発生し、パージガス配管の内部における圧力が変化する。この場合、圧力センサによって、パージガス配管の内部におけるパージガスの圧力の変化を検知することができ、これにより、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きたことを検知することができる。
Furthermore, with this configuration, the pressure inside the purge gas piping is kept constant by the pressure adjustment unit. If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (e.g., ammonia gas) is generated from the liquid fuel material, and the pressure inside the purge gas piping changes. In this case, the pressure sensor can detect the change in the pressure of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
また、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合には、液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）が発生し、パージガス配管の内部におけるパージガスの流量が変化する。この場合、流量センサによって、パージガス配管の内部におけるパージガスの流量の変化を検知することができ、これにより、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きたことを検知することができる。
In addition, if liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (such as ammonia gas) will be generated from the liquid fuel material, causing a change in the flow rate of the purge gas inside the purge gas piping. In this case, the flow sensor can detect the change in the flow rate of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
また、本発明のポンプ装置は、パージガス配管に設置され、パージガス配管の内部に液体燃料材料から気化した燃料ガスが混入しているか否かを検知する検知器を備えてもよい。
The pump device of the present invention may also include a detector that is installed in the purge gas piping and detects whether fuel gas vaporized from the liquid fuel material has entered the inside of the purge gas piping.
液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合には、パージガス配管の内部に液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）が混入する。この場合、検知器によって、パージガス配管の内部に液体燃料材料から気化した燃料ガスが混入しているか否かを検知することができ、これにより、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きたことを検知することができる。
If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, fuel gas (such as ammonia gas) vaporized from the liquid fuel material will get into the purge gas piping. In this case, a detector can detect whether or not fuel gas vaporized from the liquid fuel material has gotten into the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
また、本発明のポンプ装置は、パージガス配管に接続され、パージガス配管の内部に混入した液体燃料材料から気化した燃料ガスを除害処理する除害装置を備えてもよい。
The pump device of the present invention may also include a detoxification device that is connected to the purge gas piping and that detoxifies the fuel gas vaporized from the liquid fuel material that has been mixed inside the purge gas piping.
液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合に、除害装置によって、パージガス配管の内部に混入した液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）を除害処理して無害化することができる。
If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, the decontamination device can decontaminate the fuel gas (such as ammonia gas) that has evaporated from the liquid fuel material that has gotten into the purge gas piping, rendering it harmless.
本発明のポンプシステムは、腐食性を有する液体燃料材料が溜められるタンクと、タンクから液体燃料材料を汲み上げるポンプ装置と、を備えるポンプシステムにおいて、ポンプ装置は、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてポンプ装置の駆動力を発生させるモータと、モータを覆うモータケーシングと、タンクの外部に設置される電源装置に接続され、電源装置からモータに電力を供給するモータケーブルと、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーブルを覆うモータケーブル保護管と、液体燃料材料に対して耐腐食性を有する材料で構成され、タンクの内部においてモータケーシングに接続されるタンク内配管と、タンクの外部に設置されるパージガス供給部に接続され、パージガス供給部から供給されるパージガスが流れるパージガス配管と、パージガス配管に設置され、パージガス配管の内部の圧力を一定に保つ圧力調整部と、パージガス配管に設置され、パージガス配管の内部におけるパージガスの圧力の変化を検知する圧力センサと、パージガス配管に設置され、パージガス配管の内部におけるパージガスの流量の変化を検知する流量センサと、を備え、パージガス配管は、モータケーブル保護管およびタンク内配管と接続され、パージガス供給部から供給されるパージガスが、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻されるように構成されている。
The pump system of the present invention includes a tank for storing a corrosive liquid fuel material, and a pump device for pumping the liquid fuel material from the tank, the pump device being made of a material that is corrosion-resistant to the liquid fuel material and including a motor that generates a driving force for the pump device inside the tank, a motor casing that covers the motor, a motor cable that is connected to a power supply device installed outside the tank and supplies power from the power supply device to the motor, a motor cable protective tube that is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, tank internal piping that is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, and a purge gas supply unit that is installed outside the tank. The purge gas supply system includes a purge gas pipe through which purge gas supplied from the purge gas supply unit flows, a pressure adjustment unit installed in the purge gas pipe to keep the pressure inside the purge gas pipe constant, a pressure sensor installed in the purge gas pipe to detect changes in the pressure of the purge gas inside the purge gas pipe, and a flow rate sensor installed in the purge gas pipe to detect changes in the flow rate of the purge gas inside the purge gas pipe. The purge gas pipe is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas pipe through the other of the motor cable protection tube or the tank internal piping.
このポンプシステムによっても、上記のポンプ装置と同様に、腐食性を有する液体燃料材料（例えば、液体アンモニアなど）が溜められるタンクの内部にポンプ装置が設置されるが、液体燃料材料に対して耐腐食性を有する材料（例えば、ステンレスなど）で構成されるモータケーシングによってモータが覆われているため、ポンプ装置を腐食から適切に保護することができる。この場合、ポンプ装置のモータに電力を供給するモータケーブルも、腐食性を有する液体燃料材料が溜められるタンクの内部に設置されることになるが、液体燃料材料に対して耐腐食性を有する材料で構成されるモータケーブル保護管によってモータケーブルが覆われているため、モータケーブルを腐食から適切に保護することができる。
In this pump system, as with the pump device described above, the pump device is installed inside a tank that stores a corrosive liquid fuel material (e.g., liquid ammonia), but since the motor is covered by a motor casing made of a material that is corrosion-resistant to the liquid fuel material (e.g., stainless steel), the pump device can be adequately protected from corrosion. In this case, the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores the corrosive liquid fuel material, but since the motor cable is covered by a motor cable protective tube made of a material that is corrosion-resistant to the liquid fuel material, the motor cable can be adequately protected from corrosion.
また、このポンプシステムによっても、パージガス供給部から供給されるパージガス（例えば、窒素ガスなど）が、パージガス配管からモータケーブル保護管またはタンク内配管の一方を通ってモータケーシングの内部に供給され、モータケーシングの内部からモータケーブル保護管またはタンク内配管の他方を通ってパージガス配管に戻される。このようにモータケーブル保護管とタンク内配管を利用して、パージガスを循環させることができるので、パージガスを循環させることができない場合に比べて、モータケーシングの内部をパージガスによって効果的にパージすることができる。したがって、液体燃料材料がモータケーシングの内部に入り込む事態が起きたとしても、パージによってポンプ装置を腐食から適切に保護することができる。また、この場合、パージガスを循環させることができるので、モータケーブル保護管の内部もパージガスによって効果的にパージすることができる。したがって、液体燃料材料がモータケーシングの内部に入り込む事態が起きたとしても、パージによってモータケーブルを腐食から適切に保護することができる。
Also, with this pump system, the purge gas (such as nitrogen gas) supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing through the other of the motor cable protection tube or the tank internal piping to the purge gas piping. In this way, the purge gas can be circulated using the motor cable protection tube and the tank internal piping, so the inside of the motor casing can be purged more effectively with the purge gas than when the purge gas cannot be circulated. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the pump device can be appropriately protected from corrosion by purging. Also, in this case, since the purge gas can be circulated, the inside of the motor cable protection tube can also be effectively purged with the purge gas. Therefore, even if a liquid fuel material gets into the inside of the motor casing, the motor cable can be appropriately protected from corrosion by purging.
さらに、このポンプシステムによっても、圧力調整部によって、パージガス配管の内部の圧力を一定に保たれている。液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合には、液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）が発生し、パージガス配管の内部における圧力が変化する。この場合、圧力センサによって、パージガス配管の内部におけるパージガスの圧力の変化を検知することができ、これにより、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きたことを検知することができる。
Furthermore, with this pump system, the pressure inside the purge gas piping is kept constant by the pressure adjustment unit. If liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (such as ammonia gas) is generated from the liquid fuel material, and the pressure inside the purge gas piping changes. In this case, the pressure sensor can detect the change in purge gas pressure inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
また、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きた場合には、液体燃料材料から気化した燃料ガス（例えば、アンモニアガスなど）が発生し、パージガス配管の内部におけるパージガスの流量が変化する。この場合、流量センサによって、パージガス配管の内部におけるパージガスの流量の変化を検知することができ、これにより、液体燃料材料がモータケーシングやモータケーブル保護管やタンク内配管の内部に入り込む事態が起きたことを検知することができる。
In addition, if liquid fuel material gets into the motor casing, motor cable protection tube, or tank internal piping, vaporized fuel gas (such as ammonia gas) will be generated from the liquid fuel material, causing a change in the flow rate of the purge gas inside the purge gas piping. In this case, the flow sensor can detect the change in the flow rate of the purge gas inside the purge gas piping, making it possible to detect that liquid fuel material has gotten into the motor casing, motor cable protection tube, or tank internal piping.
本発明によれば、液体燃料材料がポンプ装置のモータ内部に入り込む事態が起きた場合に、そのこと検知することができ、ポンプ装置を腐食から保護することができる。
According to the present invention, if liquid fuel material gets inside the motor of a pump device, this can be detected and the pump device can be protected from corrosion.
（実施の形態）
以下、本発明の実施の形態のポンプ装置について、図面を用いて説明する。本実施の形態では、液体アンモニア用のキャンドモータポンプ等として用いられるポンプ装置の場合を例示する。 (Embodiment)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pump device according to an embodiment of the present invention will now be described with reference to the drawings. In the present embodiment, a pump device used as a canned motor pump for liquid ammonia or the like will be described as an example.
以下、本発明の実施の形態のポンプ装置について、図面を用いて説明する。本実施の形態では、液体アンモニア用のキャンドモータポンプ等として用いられるポンプ装置の場合を例示する。 (Embodiment)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pump device according to an embodiment of the present invention will now be described with reference to the drawings. In the present embodiment, a pump device used as a canned motor pump for liquid ammonia or the like will be described as an example.
本発明の実施の形態のポンプ装置の構成を、図面を参照して説明する。図１は、本実施の形態のポンプシステムの構成を示す説明図であり、図２は、本実施の形態のポンプ装置の断面図である。図１および図２に示すように、ポンプシステム１は、液体アンモニア（腐食性を有する液体燃料材料）が溜められるタンク２と、タンク２の内部に設置されて液体アンモニアを汲み上げるポンプ装置３を備える。タンク２は、液体アンモニアに対する耐腐食性を有する材料（例えば、ステンレスなど）で構成されるタンクケーシング４を備えており、ポンプ装置３は、液体アンモニアに対する耐腐食性を有する材料（例えば、ステンレスなど）で構成されるモータケーシング５を備えている。
The configuration of a pump device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a pump system according to this embodiment, and FIG. 2 is a cross-sectional view of the pump device according to this embodiment. As shown in FIGS. 1 and 2, the pump system 1 includes a tank 2 that stores liquid ammonia (a corrosive liquid fuel material), and a pump device 3 that is installed inside the tank 2 and pumps up the liquid ammonia. The tank 2 includes a tank casing 4 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia, and the pump device 3 includes a motor casing 5 made of a material (e.g., stainless steel) that is resistant to corrosion by liquid ammonia.
図２に示すように、モータケーシング５の内部には、ポンプ装置３の駆動力を発生させるモータ（固定子）６と、モータ（回転子）６と、モータ（回転子）６’の駆動力によって回転される回転シャフト７と、回転シャフト７を回転可能に軸支する上下一対の軸受け８を備えている。尚、モータ（固定子）６とモータ（回転子）６’はそれぞれ液体に接触せぬよう密封されたキャンドモータ構造である。また、モータケーシング５の内部には、上下一対の軸受け８の近傍に、軸受け８の高周波振動を測定する加速度センサ９がそれぞれ設置されている。
As shown in FIG. 2, inside the motor casing 5 there are a motor (stator) 6 that generates the driving force for the pump device 3, a motor (rotor) 6, a rotating shaft 7 that is rotated by the driving force of the motor (rotor) 6', and a pair of upper and lower bearings 8 that rotatably support the rotating shaft 7. The motor (stator) 6 and the motor (rotor) 6' each have a canned motor structure that is sealed so as not to come into contact with liquid. Inside the motor casing 5, acceleration sensors 9 that measure high-frequency vibrations of the bearings 8 are installed near the pair of upper and lower bearings 8.
図１および図２に示すように、タンク２の外部には、ポンプ装置３に電力を供給する電源装置１０と、上下一対の加速度センサ９からの出力信号が入力される二つの計測装置１１（上部計測装置１１と下部計測装置１１）が設けられている。モータ（固定子）６には、電源装置１０からの電力を供給するモータケーブル１２が接続されており、上下一対の加速度センサ９には、出力信号を計測装置１１（上部計測装置１１と下部計測装置１１）に伝達するセンサケーブル１３がそれぞれ接続されている。モータケーブルとセンサケーブル１３は、液体アンモニアに対する耐腐食性を有する材料（例えば、ステンレスなど）で構成されるモータケーブル保護管１４とセンサケーブル保護管１５でそれぞれ覆われている。センサケーブル保護管１５は、タンク内配管と呼ぶこともできる。
As shown in Figures 1 and 2, outside the tank 2, there are provided a power supply unit 10 that supplies power to the pump device 3, and two measuring devices 11 (upper measuring device 11 and lower measuring device 11) to which output signals from a pair of upper and lower acceleration sensors 9 are input. A motor cable 12 that supplies power from the power supply unit 10 is connected to the motor (stator) 6, and a sensor cable 13 that transmits output signals to the measuring devices 11 (upper measuring device 11 and lower measuring device 11) is connected to each of the pair of upper and lower acceleration sensors 9. The motor cable and sensor cable 13 are covered by a motor cable protective tube 14 and a sensor cable protective tube 15, respectively, which are made of a material (such as stainless steel) that is resistant to corrosion by liquid ammonia. The sensor cable protective tube 15 can also be called an in-tank piping.
図１に示すように、タンク２の外部には、パージガスである窒素ガスを供給する窒素タンク１６と、窒素タンク１６から供給される窒素ガスが流れる窒素ガス配管１７が設けられている。ここでは、窒素タンク１６が本発明のパージガス供給部に相当し、窒素ガス配管１７が本発明のパージガス配管に相当する。窒素ガス配管１７は、モータケーブル保護管１４およびセンサケーブル保護管１５と接続されており、窒素タンク１６から供給される窒素ガスが、窒素ガス配管１７からセンサケーブル保護管１５を通ってモータケーシング５の内部に供給され、モータケーシング５の内部からモータケーブル保護管１４を通って窒素ガス配管１７に戻されるように構成されている。なお、窒素タンク１６から供給される窒素ガスが、窒素ガス配管１７からモータケーブル保護管１４を通ってモータケーシング５の内部に供給され、モータケーシング５の内部からセンサケーブル保護管１５を通って窒素ガス配管１７に戻されるように構成されてもよい。
As shown in FIG. 1, outside the tank 2, there is provided a nitrogen tank 16 for supplying nitrogen gas, which is a purge gas, and a nitrogen gas pipe 17 through which the nitrogen gas supplied from the nitrogen tank 16 flows. Here, the nitrogen tank 16 corresponds to the purge gas supply unit of the present invention, and the nitrogen gas pipe 17 corresponds to the purge gas pipe of the present invention. The nitrogen gas pipe 17 is connected to the motor cable protective tube 14 and the sensor cable protective tube 15, and is configured so that the nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas pipe 17 through the sensor cable protective tube 15 to the inside of the motor casing 5, and is returned from the inside of the motor casing 5 through the motor cable protective tube 14 to the nitrogen gas pipe 17. It is also possible to configure so that the nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas pipe 17 through the motor cable protective tube 14 to the inside of the motor casing 5, and is returned from the inside of the motor casing 5 through the sensor cable protective tube 15 to the nitrogen gas pipe 17.
また、図１に示すように、窒素ガス配管１７には、窒素ガス配管１７の内部の圧力を一定に保つ圧力調整部１８と、窒素ガス配管１７の内部における窒素ガスの圧力の変化を検知する圧力センサ１９と、窒素ガス配管１７の内部における窒素ガスの流量の変化を検知する流量センサ２０が設けられている。圧力調整部１８は、例えば減圧弁などで構成することができる。また、窒素ガス配管１７には、窒素ガス配管１７の内部に液体アンモニアから気化したアンモニアガスが混入しているか否かを検知するアンモニア検知器２１が設けられている。アンモニア検知器２１は、例えば、窒素ガス配管１７の中の窒素ガスに含まれるアンモニアの濃度が所定の閾値以上になった場合に、窒素ガス配管１７の内部にアンモニアガスが混入していると検知することができる。
As shown in FIG. 1, the nitrogen gas pipe 17 is provided with a pressure adjustment unit 18 that keeps the pressure inside the nitrogen gas pipe 17 constant, a pressure sensor 19 that detects changes in the pressure of the nitrogen gas inside the nitrogen gas pipe 17, and a flow rate sensor 20 that detects changes in the flow rate of the nitrogen gas inside the nitrogen gas pipe 17. The pressure adjustment unit 18 can be composed of, for example, a pressure reducing valve. The nitrogen gas pipe 17 is also provided with an ammonia detector 21 that detects whether ammonia gas vaporized from liquid ammonia is mixed inside the nitrogen gas pipe 17. The ammonia detector 21 can detect that ammonia gas is mixed inside the nitrogen gas pipe 17, for example, when the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 becomes equal to or higher than a predetermined threshold value.
さらに、図１に示すように、窒素ガス配管１７からは、アンモニアガスを除害するためのアンモニア除害配管２２が分岐して設けられている。アンモニア除害配管２２は、窒素ガス配管１７の内部に混入した液体アンモニアから気化したアンモニアガスを除害処理するアンモニア除害装置２３に接続されている。
Furthermore, as shown in FIG. 1, an ammonia abatement pipe 22 for abating ammonia gas is branched off from the nitrogen gas pipe 17. The ammonia abatement pipe 22 is connected to an ammonia abatement device 23 that abats ammonia gas vaporized from the liquid ammonia mixed inside the nitrogen gas pipe 17.
アンモニア除害装置２３には、アンモニアガスを除害するために用いる水（洗浄水）を供給するための給水菅２４と、アンモニアガスの除害によって生成されるアンモニア水を排出するための排水管２５と、アンモニアガスが除外された窒素ガスを排出するための排気菅２６が接続されている。給水管には、アンモニアガスを除害するために用いる水（洗浄水）をアンモニア除害装置２３に送るための送水ポンプ２７が設けられている。
Connected to the ammonia detoxification device 23 are a water supply pipe 24 for supplying water (washing water) used to detoxify the ammonia gas, a drain pipe 25 for discharging the ammonia water produced by the ammonia gas detoxification, and an exhaust pipe 26 for discharging the nitrogen gas from which the ammonia gas has been removed. A water pump 27 is provided on the water supply pipe for sending the water (washing water) used to detoxify the ammonia gas to the ammonia detoxification device 23.
アンモニア除害配管２２には、アンモニアガスを除害処理するときに開制御される自動弁２８と、アンモニアガスが混入している窒素ガスをアンモニア除害装置２３に送るための送風機２９が設けられている。アンモニア除害配管２２の自動弁２８は、アンモニアガスを除害処理しないときには閉制御される。また、窒素ガス配管１７には、アンモニアガスを除害処理するときに閉制御される自動弁３０が設けられている。窒素ガス配管１７の自動弁３０は、アンモニアガスを除害処理しないときには開制御される。
The ammonia abatement pipe 22 is provided with an automatic valve 28 that is controlled to be open when ammonia gas is being abatement treated, and a blower 29 for sending nitrogen gas mixed with ammonia gas to the ammonia abatement device 23. The automatic valve 28 of the ammonia abatement pipe 22 is controlled to be closed when ammonia gas is not being abatement treated. In addition, the nitrogen gas pipe 17 is provided with an automatic valve 30 that is controlled to be closed when ammonia gas is being abatement treated. The automatic valve 30 of the nitrogen gas pipe 17 is controlled to be open when ammonia gas is not being abatement treated.
図３および図４は、本実施の形態のポンプシステム１における窒素ガスの流れを示す説明図である。図３および図４では、窒素ガスの流れが矢印で示されている。図３に示すように、アンモニア検知器２１によって窒素ガス配管１７の内部にアンモニアガスが混入していると検知されない場合、すなわち、窒素ガス配管１７の中の窒素ガスに含まれるアンモニアの濃度が所定の閾値未満である場合には、窒素ガス配管１７の自動弁３０が開制御され、アンモニア除害配管２２の自動弁２８が閉制御される。
FIGS. 3 and 4 are explanatory diagrams showing the flow of nitrogen gas in the pump system 1 of this embodiment. In FIG. 3 and FIG. 4, the flow of nitrogen gas is indicated by arrows. As shown in FIG. 3, when the ammonia detector 21 does not detect that ammonia gas is mixed inside the nitrogen gas pipe 17, that is, when the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 is below a predetermined threshold value, the automatic valve 30 of the nitrogen gas pipe 17 is controlled to be open, and the automatic valve 28 of the ammonia abatement pipe 22 is controlled to be closed.
また、図４に示すように、アンモニア検知器２１によって窒素ガス配管１７の内部にアンモニアガスが混入していると検知された場合、すなわち、窒素ガス配管１７の中の窒素ガスに含まれるアンモニアの濃度が所定の閾値以上である場合には、窒素ガス配管１７の自動弁３０が閉制御され、アンモニア除害配管２２の自動弁２８が開制御される。
Also, as shown in FIG. 4, if the ammonia detector 21 detects that ammonia gas has been mixed inside the nitrogen gas pipe 17, that is, if the concentration of ammonia contained in the nitrogen gas in the nitrogen gas pipe 17 is equal to or higher than a predetermined threshold value, the automatic valve 30 in the nitrogen gas pipe 17 is controlled to close, and the automatic valve 28 in the ammonia abatement pipe 22 is controlled to open.
このような本実施の形態のポンプ装置３によれば、腐食性を有する液体アンモニアが溜められるタンク２の内部にポンプ装置３が設置されるが、液体アンモニアに対して耐腐食性を有する材料（例えば、ステンレスなど）で構成されるモータケーシング５によってモータ（固定子）６が覆われているため、ポンプ装置３を腐食から適切に保護することができる。この場合、ポンプ装置３のモータ６に電力を供給するモータケーブル１２も、液体アンモニアが溜められるタンク２の内部に設置されることになるが、液体アンモニアに対して耐腐食性を有する材料で構成されるモータケーブル保護管１４によってモータケーブル１２が覆われているため、モータケーブル１２を腐食から適切に保護することができる。
In accordance with the pump device 3 of this embodiment, the pump device 3 is installed inside the tank 2 in which corrosive liquid ammonia is stored, but since the motor (stator) 6 is covered by the motor casing 5 made of a material (e.g., stainless steel) that is corrosion-resistant to liquid ammonia, the pump device 3 can be appropriately protected from corrosion. In this case, the motor cable 12 that supplies power to the motor 6 of the pump device 3 is also installed inside the tank 2 in which liquid ammonia is stored, but since the motor cable 12 is covered by the motor cable protective tube 14 made of a material that is corrosion-resistant to liquid ammonia, the motor cable 12 can be appropriately protected from corrosion.
また、本実施の形態のポンプ装置３によれば、窒素タンク１６から供給される窒素ガスが、窒素ガス配管１７からモータケーブル保護管１４またはタンク内配管１５の一方を通ってモータケーシング５の内部に供給され、モータケーシング５の内部からモータケーブル保護管１４またはタンク内配管１５の他方を通って窒素ガス配管１７に戻される。このようにモータケーブル保護管１４とタンク内配管１５を利用して、窒素ガスを循環させることができるので、窒素ガスを循環させることができない場合に比べて、モータケーシング５の内部を窒素ガスによって効果的にパージすることができる。したがって、液体アンモニアがモータケーシング５の内部に入り込む事態が起きたとしても、パージによってモータ（固定子）６を腐食から適切に保護することができる。また、この場合、窒素ガスを循環させることができるので、モータケーブル保護管１４の内部も窒素ガスによって効果的にパージすることができる。したがって、液体アンモニアがモータケーシング５の内部に入り込む事態が起きたとしても、パージによってモータケーブル１２を腐食から適切に保護することができる。
In addition, according to the pump device 3 of this embodiment, nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas pipe 17 to the inside of the motor casing 5 through one of the motor cable protection pipe 14 or the tank internal pipe 15, and is returned from the inside of the motor casing 5 to the nitrogen gas pipe 17 through the other of the motor cable protection pipe 14 or the tank internal pipe 15. In this way, nitrogen gas can be circulated using the motor cable protection pipe 14 and the tank internal pipe 15, so the inside of the motor casing 5 can be purged more effectively with nitrogen gas than when nitrogen gas cannot be circulated. Therefore, even if liquid ammonia gets into the inside of the motor casing 5, the motor (stator) 6 can be appropriately protected from corrosion by purging. In addition, in this case, since nitrogen gas can be circulated, the inside of the motor cable protection pipe 14 can also be effectively purged with nitrogen gas. Therefore, even if liquid ammonia gets into the inside of the motor casing 5, the motor cable 12 can be appropriately protected from corrosion by purging.
さらに、本実施の形態のポンプ装置３によれば、圧力調整部１８によって、窒素ガス配管１７の内部の圧力を一定に保たれている。液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きた場合には、液体アンモニアから気化したアンモニアガスが発生し、窒素ガス配管１７の内部における圧力が変化する。この場合、圧力センサ１９によって、窒素ガス配管１７の内部における窒素ガスの圧力の変化を検知することができ、これにより、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きたことを検知することができる。
Furthermore, according to the pump device 3 of this embodiment, the pressure inside the nitrogen gas piping 17 is kept constant by the pressure adjustment unit 18. If liquid ammonia gets into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15, ammonia gas is vaporized from the liquid ammonia, and the pressure inside the nitrogen gas piping 17 changes. In this case, the pressure sensor 19 can detect the change in the pressure of the nitrogen gas inside the nitrogen gas piping 17, and thereby it can be detected that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15.
また、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きた場合には、液体アンモニアから気化したアンモニアガスが発生し、窒素ガス配管１７の内部における窒素ガスの流量が変化する。この場合、流量センサ２０によって、窒素ガス配管１７の内部における窒素ガスの流量の変化を検知することができ、これにより、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きたことを検知することができる。
Furthermore, if liquid ammonia gets into the motor casing 5, the motor cable protection tube 14, or the tank internal piping 15, ammonia gas vaporizes from the liquid ammonia, causing a change in the flow rate of nitrogen gas inside the nitrogen gas piping 17. In this case, the flow sensor 20 can detect the change in the flow rate of nitrogen gas inside the nitrogen gas piping 17, making it possible to detect that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank internal piping 15.
また、本実施の形態では、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きた場合には、窒素ガス配管１７の内部に液体アンモニアから気化したアンモニアガスが混入する。この場合、アンモニア検知器２１によって、窒素ガス配管１７の内部に液体アンモニアから気化したアンモニアガスが混入しているか否かを検知することができ、これにより、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きたことを検知することができる。
In addition, in this embodiment, if liquid ammonia gets into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15, ammonia gas vaporized from the liquid ammonia will get into the nitrogen gas piping 17. In this case, the ammonia detector 21 can detect whether ammonia gas vaporized from liquid ammonia has got into the nitrogen gas piping 17, and thus it can detect that liquid ammonia has gotten into the motor casing 5, the motor cable protection tube 14, or the tank inner piping 15.
また、本実施の形態では、液体アンモニアがモータケーシング５やモータケーブル保護管１４やタンク内配管１５の内部に入り込む事態が起きた場合に、アンモニア除害装置２３によって、窒素ガス配管１７の内部に混入した液体アンモニアから気化したアンモニアガスを除害処理して無害化することができる。
In addition, in this embodiment, if liquid ammonia gets into the motor casing 5, the motor cable protection tube 14, or the tank internal piping 15, the ammonia detoxification device 23 can detoxify the ammonia gas that has evaporated from the liquid ammonia that has gotten into the nitrogen gas piping 17, making it harmless.
以上、本発明の実施の形態を例示により説明したが、本発明の範囲はこれらに限定されるものではなく、請求項に記載された範囲内において目的に応じて変更・変形することが可能である。
The above describes the embodiments of the present invention by way of example, but the scope of the present invention is not limited to these, and can be modified and altered according to the purpose within the scope of the claims.
以上のように、本発明にかかるポンプ装置は、液体燃料材料がポンプ装置の電気系統部品の収納室に入り込む事態が起きた場合に、そのこと検知することができ、ポンプ装置を腐食から保護することができるという効果を有し、液体アンモニア用のキャンドモータポンプ等として用いられ、有用である。
As described above, the pump device of the present invention has the effect of being able to detect when liquid fuel material has entered the storage chamber for the pump device's electrical system components and protecting the pump device from corrosion, and is useful as a canned motor pump for liquid ammonia, etc.
１ ポンプシステム
２ タンク
３ ポンプ装置
４ タンクケーシング
５ モータケーシング
６ モータ（固定子）
６’ モータ（回転子）
７ 回転シャフト
８ 軸受け
９ 加速度センサ（センサ）
１０ 電源装置
１１ 計測装置（上部計測装置、下部計測装置）
１２ モータケーブル
１３ センサケーブル
１４ モータケーブル保護管
１５ センサケーブル保護管（タンク内配管）
１６ 窒素タンク（パージガス供給部）
１７ 窒素ガス配管（パージガス配管）
１８ 圧力調整部
１９ 圧力センサ
２０ 流量センサ
２１ アンモニア検知器（検知器）
２２ アンモニア除害配管
２３ アンモニア除害装置（除害装置）
２４ 給水菅
２５ 排水管
２６ 排気菅
２７ 送水ポンプ
２８ 自動弁
２９ 送風機
３０ 自動弁 1Pump system 2 Tank 3 Pump device 4 Tank casing 5 Motor casing 6 Motor (stator)
6' Motor (rotor)
7 Rotatingshaft 8 Bearing 9 Acceleration sensor (sensor)
10Power supply unit 11 Measuring device (upper measuring device, lower measuring device)
12Motor cable 13 Sensor cable 14 Motor cable protection tube 15 Sensor cable protection tube (piping inside tank)
16 Nitrogen tank (purge gas supply unit)
17 Nitrogen gas piping (purge gas piping)
18Pressure adjustment unit 19 Pressure sensor 20 Flow rate sensor 21 Ammonia detector (detector)
22 Ammonia abatement piping 23 Ammonia abatement device (abatement device)
24Water supply pipe 25 Drain pipe 26 Exhaust pipe 27 Water pump 28 Automatic valve 29 Blower 30 Automatic valve
２ タンク
３ ポンプ装置
４ タンクケーシング
５ モータケーシング
６ モータ（固定子）
６’ モータ（回転子）
７ 回転シャフト
８ 軸受け
９ 加速度センサ（センサ）
１０ 電源装置
１１ 計測装置（上部計測装置、下部計測装置）
１２ モータケーブル
１３ センサケーブル
１４ モータケーブル保護管
１５ センサケーブル保護管（タンク内配管）
１６ 窒素タンク（パージガス供給部）
１７ 窒素ガス配管（パージガス配管）
１８ 圧力調整部
１９ 圧力センサ
２０ 流量センサ
２１ アンモニア検知器（検知器）
２２ アンモニア除害配管
２３ アンモニア除害装置（除害装置）
２４ 給水菅
２５ 排水管
２６ 排気菅
２７ 送水ポンプ
２８ 自動弁
２９ 送風機
３０ 自動弁 1
6' Motor (rotor)
7 Rotating
10
12
16 Nitrogen tank (purge gas supply unit)
17 Nitrogen gas piping (purge gas piping)
18
22 Ammonia abatement piping 23 Ammonia abatement device (abatement device)
24
Claims (4)
- 腐食性を有する液体燃料材料が溜められるタンクの内部から前記液体燃料材料を汲み上げるポンプ装置において、
前記ポンプ装置は、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記ポンプ装置のモータを覆うモータケーシングと、
前記モータケーシング内に設置され、前記ポンプ装置の駆動力を発生させるモータと、
前記タンクの外部に設置される電源装置に接続され、前記電源装置から前記モータに電力を供給するモータケーブルと、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記モータケーブルを覆うモータケーブル保護管と、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記モータケーシングに接続されるタンク内配管と、
前記タンクの外部に設置されるパージガス供給部に接続され、前記パージガス供給部から供給されるパージガスが流れるパージガス配管と、
前記パージガス配管に設置され、前記パージガス配管の内部の圧力を一定に保つ圧力調整部と、
前記パージガス配管に設置され、前記パージガス配管の内部における前記パージガスの圧力の変化を検知する圧力センサと、
前記パージガス配管に設置され、前記パージガス配管の内部における前記パージガスの流量の変化を検知する流量センサと、
を備え、
前記パージガス配管は、前記モータケーブル保護管および前記タンク内配管と接続され、前記パージガス供給部から供給されるパージガスが、前記パージガス配管から前記モータケーブル保護管または前記タンク内配管の一方を通って前記モータケーシングの内部に供給され、前記モータケーシングの内部から前記モータケーブル保護管または前記タンク内配管の他方を通って前記パージガス配管に戻されるように構成されている、ポンプ装置。 1. A pump device for pumping a corrosive liquid fuel material from inside a tank in which the liquid fuel material is stored, comprising:
The pump device includes:
a motor casing that is made of a material that is corrosion-resistant to the liquid fuel material and that covers a motor of the pump device inside the tank;
a motor installed in the motor casing and generating a driving force for the pump device;
a motor cable connected to a power supply device installed outside the tank and supplying power from the power supply device to the motor;
a motor cable protection tube that is made of a material that is corrosion-resistant to the liquid fuel material and that covers the motor cable inside the tank;
an internal tank pipe that is made of a material that is corrosion resistant to the liquid fuel material and is connected to the motor casing inside the tank;
a purge gas pipe connected to a purge gas supply unit installed outside the tank and through which a purge gas supplied from the purge gas supply unit flows;
a pressure adjusting unit that is installed in the purge gas piping and that keeps the internal pressure of the purge gas piping constant;
a pressure sensor installed in the purge gas piping and configured to detect a change in pressure of the purge gas inside the purge gas piping;
a flow rate sensor that is installed in the purge gas piping and detects a change in a flow rate of the purge gas inside the purge gas piping;
Equipped with
The purge gas piping is connected to the motor cable protection tube and the tank internal piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through one of the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping. - 前記パージガス配管に設置され、前記パージガス配管の内部に前記液体燃料材料から気化した燃料ガスが混入しているか否かを検知する検知器を備える、請求項１に記載のポンプ装置。 The pump device according to claim 1, further comprising a detector that is installed in the purge gas piping and detects whether fuel gas vaporized from the liquid fuel material is mixed into the purge gas piping.
- 前記パージガス配管に接続され、前記パージガス配管の内部に混入した前記液体燃料材料から気化した燃料ガスを除害処理する除害装置を備える、請求項１または請求項２に記載のポンプ装置。 The pump device according to claim 1 or 2, further comprising a detoxification device connected to the purge gas pipe for detoxifying the fuel gas vaporized from the liquid fuel material mixed inside the purge gas pipe.
- 腐食性を有する液体燃料材料が溜められるタンクと、
前記タンクから前記液体燃料材料を汲み上げるポンプ装置と、
を備えるポンプシステムにおいて、
前記ポンプ装置は、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記ポンプ装置のモータを覆うモータケーシングと、
前記モータケーシング内に設置され、前記ポンプ装置の駆動力を発生させるモータと、
前記タンクの外部に設置される電源装置に接続され、前記電源装置から前記モータに電力を供給するモータケーブルと、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記モータケーブルを覆うモータケーブル保護管と、
前記液体燃料材料に対して耐腐食性を有する材料で構成され、前記タンクの内部において前記モータケーシングに接続されるタンク内配管と、
前記タンクの外部に設置されるパージガス供給部に接続され、前記パージガス供給部から供給されるパージガスが流れるパージガス配管と、
前記パージガス配管に設置され、前記パージガス配管の内部の圧力を一定に保つ圧力調整部と、
前記パージガス配管に設置され、前記パージガス配管の内部における前記パージガスの圧力の変化を検知する圧力センサと、
前記パージガス配管に設置され、前記パージガス配管の内部における前記パージガスの流量の変化を検知する流量センサと、
を備え、
前記パージガス配管は、前記モータケーブル保護管および前記タンク内配管と接続され、前記パージガス供給部から供給されるパージガスが、前記パージガス配管から前記モータケーブル保護管または前記タンク内配管の一方を通って前記モータケーシングの内部に供給され、前記モータケーシングの内部から前記モータケーブル保護管または前記タンク内配管の他方を通って前記パージガス配管に戻されるように構成されている、ポンプシステム。 A tank for storing a corrosive liquid fuel material;
a pump device for pumping the liquid fuel material from the tank;
A pump system comprising:
The pump device includes:
a motor casing that is made of a material that is corrosion-resistant to the liquid fuel material and that covers a motor of the pump device inside the tank;
a motor installed in the motor casing and generating a driving force for the pump device;
a motor cable connected to a power supply device installed outside the tank and supplying power from the power supply device to the motor;
a motor cable protection tube that is made of a material that is corrosion-resistant to the liquid fuel material and that covers the motor cable inside the tank;
an internal tank pipe that is made of a material that is corrosion resistant to the liquid fuel material and is connected to the motor casing inside the tank;
a purge gas pipe connected to a purge gas supply unit installed outside the tank and through which a purge gas supplied from the purge gas supply unit flows;
a pressure adjusting unit that is installed in the purge gas piping and that keeps the internal pressure of the purge gas piping constant;
a pressure sensor installed in the purge gas piping and configured to detect a change in pressure of the purge gas inside the purge gas piping;
a flow rate sensor that is installed in the purge gas piping and detects a change in a flow rate of the purge gas inside the purge gas piping;
Equipped with
The purge gas piping is connected to the motor cable protection tube and the tank internal piping, and purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through one of the motor cable protection tube or the tank internal piping to the inside of the motor casing, and is returned from the inside of the motor casing to the purge gas piping through the other of the motor cable protection tube or the tank internal piping.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013092145A (en) * | 2011-10-26 | 2013-05-16 | Assoma Inc | Permanent magnet motor pump |
| JP2019113067A (en) * | 2017-12-20 | 2019-07-11 | マン・エナジー・ソリューションズ・エスイー | Exhaust gas recirculation blower and internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013092145A (en) * | 2011-10-26 | 2013-05-16 | Assoma Inc | Permanent magnet motor pump |
| JP2019113067A (en) * | 2017-12-20 | 2019-07-11 | マン・エナジー・ソリューションズ・エスイー | Exhaust gas recirculation blower and internal combustion engine |
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