JP2013241054A - Vessel, gas fuel supply equipment and method of operating gas fuel supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a liquefied gas from leaking from a pipe connected to a bottom of a tank, and to reduce costs.SOLUTION: A pipe connected to a bottom of a tank 20 is not installed. After a part of a liquefied gas is taken out from above the tank 20 by utilizing pressure in the tank 20 and a gas bottle 31 is filled with the part of the gas, gas fuel obtained by heating and vaporizing the liquefied gas in the gas bottle 31 is supplied into the tank 20 so that the inside of the tank 20 is pressurized to send out the liquefied gas. At this time, a plurality of sets of gas bottle units 30 each having the gas bottle 31 are provided to periodically delay operation timing.

Description

  The present invention relates to a ship using liquefied gas such as liquefied natural gas (LNG) as a fuel, a liquefied gas supply facility, and a method for operating the liquefied gas supply facility.

  In ships, fuel oil such as heavy oil has been widely used as fuel, but from the viewpoint of environmental conservation, suppression of sulfur components contained in exhaust gas after fuel combustion is required. Therefore, there is an active movement to switch fuel from heavy oil to liquefied gas such as liquefied natural gas (LNG) and liquefied propane gas (LPG) that do not contain sulfur components.

A ship using such a liquefied gas as a fuel is provided with a tank for storing the liquefied gas in the hull (see, for example, Patent Document 1).
The liquefied gas stored in the tank is taken out from the tank and heated to be vaporized, and sent to the propulsion main machine or the like while being pressurized to a predetermined pressure.

Special table 2009-522156

  Here, as a method of pressurizing the liquefied gas to a predetermined pressure and discharging it from the tank, one using an electric pump installed inside the tank (pump type) and one that pressurizes the phase of the tank and pushes up the liquefied gas (Tank pressurization type) can be considered. In the case of the tank pressurization type, a method has already been put into practical use in which a part of the liquefied gas in the tank is evaporated through an external heater and returned to the gas phase part above the tank as gas. In this method, since the liquefied gas in the tank needs to be guided to an external evaporator by gravity, a pipe for extracting the liquefied gas is necessarily connected to the lower part (bottom part) of the tank. As a result, a bolt tightening portion such as a flange fastening portion of a pipe connected to the tank bottom, a valve bonnet, or a maintenance opening is present below the tank.

  In the conventional tank pressurization type, when the bolt is loosened at the bolted portion of the pipe connected to the bottom of the tank, the liquefied gas leaks out, and it is necessary to provide a container for receiving this. When liquefied gas leaks from the pipe connected to the bottom of the tank, the pressure and liquid head in the tank act on the leaked liquefied gas, so there is a shielding device such as a valve between the leaking location and the tank. If not, the leak will continue until the pressure in the vessel receiving the leak is balanced, and a large amount of liquefied gas will leak out. For this reason, the capacity | capacitance and pressure-resistant intensity | strength of the container which receives a leak may become very large depending on conditions, and huge cost may be required. Also, a facility for safely discharging the liquefied gas from the container that receives the leaked liquefied gas is required, which complicates the apparatus and further increases the cost.

  The present invention has been made in view of such circumstances, and is a vessel that can eliminate the risk of liquefied gas leakage by eliminating the piping connected to the tank bottom while using the tank pressurization type. An object of the present invention is to provide a liquefied gas supply facility and a method for operating the liquefied gas supply facility.

In order to solve the above-described problems, the ship, the liquefied gas supply facility, and the operation method of the liquefied gas supply facility of the present invention employ the following means.
In other words, it is equipped with a liquefied gas supply facility that supplies liquefied gas to the propulsion main engine and related facilities, and the liquefied gas supply facility can store a liquefied gas storage tank and a part of the liquefied gas discharged from the tank. A gas container, a cooling device that cools the gas container to a pressure lower than that of the tank, and fills the gas container with a part of the liquefied gas discharged from the tank, and the gas container is heated to fill the gas container. A heating device that vaporizes the liquefied gas and obtains a higher pressure than the tank, a tank pressurization line for sending the vaporized gas fuel in the gas container to the tank and pressurizing the tank, and liquefied gas from the pressurized tank A liquefied gas discharge line that discharges to the main propulsion machine and related equipment, and a liquefied gas filling line that branches from the liquefied gas discharge line and fills the gas container with the liquefied gas. Characterized in that it obtain.

According to such a configuration, after a part of the liquefied gas discharged from the tank is branched and filled into the gas container, the gas vaporized in the gas container is fed into the tank to pressurize the inside of the tank. The liquefied gas was sent out.
Thereby, the piping which takes out liquefied gas from the tank bottom part inevitably provided by the conventional tank pressurization type becomes unnecessary, and the leak from the piping can be fundamentally excluded.
The point is that there is no pipe connected to the bottom of the tank. The liquefied gas discharge pipe is laid in the tank, but is led to the outside through the upper part of the tank. Therefore, there is no restriction on the arrangement of the piping and bottle unit connected to the liquefied gas discharge pipe, and it can be installed either below or above the tank. Even if they are installed below the tank, the portion leading from the tank to the outside (that is, the tank connection part of the liquefied gas discharge line) is the upper part of the tank. Gas does not leak out. Although the liquefied gas may leak from the flange connection due to the tank internal pressure, the leakage can be stopped immediately by opening the pressure equalization line. Therefore, neither a container that receives the liquefied gas leaking from the piping or a facility that safely discharges the liquefied gas from the container is required, and the apparatus can be simplified and reduced in cost.
Moreover, since the liquefied gas in the tank itself is used as a pressure source for discharging the liquefied gas in the tank except when the tank pressurization is started, there is no need to use a pressurized medium such as nitrogen gas. The main engine output can be prevented from lowering due to the mixture of non-combustible gas such as nitrogen. Only at the start of tank pressurization, for example, a pressurizing medium such as nitrogen gas needs to be injected into the tank gas phase, but the injection amount is small and the influence can be ignored.

It is preferable that a plurality of gas containers are provided, and the gas vaporized from the other gas container is sent to the tank through the tank pressurization line while the gas container is filled with the liquefied gas.
In this way, by providing multiple sets of gas containers and periodically shifting their operation timing, the tank is continuously and stably pressurized, and the liquefied gas in the tank is continuously and stably propelled main engine and related Can be paid out to the equipment.
Here, in order to discharge liquefied gas continuously and stably, it is preferable to provide three or more gas containers.

The cooling device can perform heat exchange with the heat medium using the liquefied gas delivered from the tank through the liquefied gas discharge line as a cold heat source, and can cool the gas container with the heat medium.
The exchange heat energy between the liquefied gas and the heat medium becomes a part of the heat energy required to vaporize the liquefied gas in the related equipment when supplying the gas fuel to the propulsion main engine side. Can be planned.

The heating device can exchange heat with a heat medium using seawater or steam discharged from the propulsion main engine as a heat source, and can heat the gas container with the heat medium.
If seawater is used in a ship, the cost is naturally low, and waste energy can be effectively utilized if steam discharged on the propulsion main engine side is used.

  Such a ship may further include a pressure equalizing pipe that communicates the liquefied gas discharge line and the gas phase in the tank. As a result, even if liquefied gas leaks from the flange connection part in the immediate vicinity of the tank of the liquefied gas discharge line, the pressure balance is achieved by connecting the liquefied gas discharge line and the gas phase of the tank through the pressure equalizing pipe. It is possible to quickly store the leakage.

  The apparatus further includes a pump that sucks up the liquefied gas in the tank and sends it to the gas container. The conventional pump type and the present invention can be combined. Thereby, it becomes possible to use this invention as an alternative apparatus at the time of a pump failure, and it becomes possible to reduce the number of pumps equipped.

  Further, the present invention is a liquefied gas supply facility for supplying a liquefied gas to a propulsion main engine and related facilities, and a tank for storing the liquefied gas and a part of the liquefied gas discharged from the tank can be branched and accommodated. Multiple sets of gas containers, a cooling device that cools the gas containers to a pressure lower than that of the tank, and fills the gas containers with a part of the liquefied gas discharged from the tank, and heats the gas containers into the gas containers. A heating device that vaporizes the filled liquefied gas and obtains a higher pressure than the tank, a tank pressurization line that sends the vaporized gas in the gas container to the tank and pressurizes the tank, and propels the liquefied gas from the pressurized tank A liquefied gas discharge line that is discharged toward the main engine and related equipment, and a liquefied gas filling line that branches from the liquefied gas discharge line and fills the gas container with the liquefied gas. To.

  The present invention also relates to a method for operating a liquefied gas supply facility as described above, wherein the gas container is cooled to fill a part of the liquefied gas from the tank into the gas container, and the gas container is heated to gas. And a pressurizing step of evaporating the liquefied gas filled in the container, sending the gas into the tank gas phase section, and pressurizing the liquefied gas in the tank.

After part of the liquefied gas discharged from the tank is branched and filled in the gas container, the gas vaporized in the gas container is supplied into the tank to pressurize the tank and discharge the liquefied gas in the tank. By doing so, the liquefied gas can be discharged without providing a pipe for taking out the liquefied gas from the tank bottom, and leakage from the pipe connected to the tank bottom can be avoided. Therefore, a container for receiving the liquefied gas leaked from the pipe connected to the bottom of the tank, a facility for safely discharging the liquefied gas from the container, and the like are unnecessary, and the apparatus can be simplified and the cost can be reduced.
Moreover, since the liquefied gas in the tank itself is used as a pressure source for discharging the liquefied gas in the tank except when the tank pressurization is started, there is no need to use a pressurized medium such as nitrogen gas. The main engine output can be prevented from lowering due to the mixture of non-combustible gas such as nitrogen. Only at the start of tank pressurization, for example, a pressurizing medium such as nitrogen gas needs to be injected into the tank gas phase, but the injection amount is small and the influence can be ignored.

It is a figure which shows the structure of the liquefied gas supply equipment of this invention. It is a figure which shows the structure of the liquefied gas supply equipment of this invention, and is a figure which shows the state following FIG. It is a figure which shows the structure of the liquefied gas supply equipment of this invention, and is a figure which shows the state following FIG. It is a figure which shows the structure of the liquefied gas supply equipment of this invention, and is a figure which shows the state following FIG. It is a figure which shows the structure of the liquefied gas supply equipment of this invention, and is a figure which shows the state following FIG. It is a figure which shows the other structural example of the liquefied gas supply equipment of this invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a diagram illustrating a configuration of a liquefied gas supply facility 10A according to the present embodiment. A liquefied gas supply facility 10A shown in this figure is provided in a ship and supplies liquefied gas as fuel for driving a main engine for propulsion of the ship.
The liquefied gas supply facility 10 </ b> A includes a tank 20 that stores liquefied gas such as LNG and LPG, a plurality of gas container units 30, a heating device 40, and a cooling device 50.

  In the tank 20, a liquid phase G1 and a gas phase G2 which are liquefied gases themselves are accommodated. The tank 20 is provided with a liquefied gas discharge line 21 that discharges the liquefied gas from the liquid phase G1 of the liquefied gas in the tank 20 and sends the liquefied gas to a propulsion main unit (not shown) through related equipment such as a vaporizer (not shown). It has been.

  The liquefied gas discharge line 21 is provided with a discharge valve 22 that adjusts the amount of liquefied gas delivered from the tank 20, and its opening and closing is controlled by a control device (not shown).

  Further, in the liquefied gas discharge line 21, one end of a pressure equalizing line 23 having a pressure equalizing valve 23a is connected to the upstream side of the discharge valve 22. The opening and closing of the pressure equalizing valve is controlled by a control device (not shown) or manually operated. The other end of the pressure equalizing line 23 is connected to the top of the tank 20 and opens toward the gas phase G2 in the tank 20.

  A plurality of gas container units 30 having the same configuration, preferably three or more sets are provided. Since each set of gas container units 30 has the same hardware configuration, in the following, when it is necessary to distinguish the three sets of gas container units 30, the gas container units 30A, 30B, 30C and When there is no need to distinguish between them, they are simply referred to as the gas container unit 30.

  The gas container unit 30 includes a gas container 31 and a bus 32 that stores a heat medium L such as glycol. At least a part of the gas container 31 is immersed in the heat medium L.

The gas container 31 is branched from the liquefied gas discharge line 21, and a liquefied gas filling line 34 into which a part of the liquefied gas discharged from the liquid phase G 1 in the tank 20 is sent, and the gas vaporized in the gas container 31 are tanked 20 and a tank pressurizing line 35 for feeding into the tank 20.
The liquefied gas filling line 34 and the tank pressurizing line 35 are provided with regulating valves 36 and 37, respectively, and their opening and closing is controlled by a control device (not shown).

  In each gas container unit 30, for example, three gas containers 31 are provided, and branch lines 34 a and 35 a branched from the liquefied gas filling line 34 and the tank pressurization line 35 to each gas container 31 include: Regulating valves 38 and 39 are provided, respectively, and their opening and closing is controlled by a control device (not shown).

  A heating medium supply line 41 and a heating medium return line 42 connected to the heating device 40 and a cooling medium supply line 51 and a cooling medium return line 52 connected to the cooling device 50 are connected to the bus 32. .

  The heating device 40 uses seawater or steam discharged on the propulsion main engine side as a heat source, exchanges heat with the heat medium returned from the bus 32 via the heating medium return line 42, and heats the temperature to, for example, 20 ° C. . The heat medium heated through the heating device 40 is sent into the bus 32 from the heating medium supply line 41.

  Here, the heating medium return line 42 is provided with a circulation pump 44 for circulating the heat medium. Furthermore, the heating medium supply line 41 and the heating medium return line 42 connected to each bus 32 of each gas container unit 30 are provided with regulating valves 45 and 46, respectively, and their opening and closing is controlled by a control device (not shown).

  Further, the cooling device 50 uses the liquefied gas discharged from the tank 20 passing through the liquefied gas discharge line 21 as a cold heat source, and exchanges heat with the heat medium returned from the bus 32 via the cooling medium return line 52, The temperature is cooled to, for example, −40 ° C. The heat medium cooled through the cooling device 50 is sent into the bus 32 through the cooling medium supply line 51.

  Here, the cooling medium return line 52 is provided with a circulation pump 54 for circulating the heat medium. Further, the cooling medium supply line 51 and the cooling medium return line 52 are provided with regulating valves 55 and 56, respectively, and their opening and closing is controlled by a control device (not shown).

  A bypass line 57 that bypasses the cooling device 50 is provided in parallel with the cooling device 50, and an adjustment valve 58 is provided in the bypass line 57. The flow rate of the liquefied gas on the cooling device 50 side is adjusted by controlling the opening degree of the adjustment valve 58 by a control device (not shown).

Next, the operation of the liquefied gas supply facility 10A as described above will be described. The operations of the following units are automatically executed based on a predetermined computer program by a control device (not shown).
The liquefied gas charge supply facility 10A is provided with a plurality of sets of gas container units 30. In each gas container unit 30, the following “liquefied gas filling process”, “pressure increase process”, “gas release” are shown. Steps are repeated sequentially. These gas container units 30 operate in a series of steps such as a “liquefied gas filling process”, a “pressure increase process”, and a “gas release process” so that the liquefied gas can be supplied to the propulsion main machine and related equipment without interruption. Is shifted.

First, the operation will be described focusing on one gas container unit 30A. In FIG. 1, the gas container unit 30A is in a state during the liquefied gas filling process, the gas container unit 30B is in a state after completion of the gas release process, and the gas container unit 30C is in a state during the gas release process. In each valve in the figure, white indicates valve opening and black indicates valve closing.
(Liquefied gas filling process)
In the gas container unit 30C whose operation timing is shifted with respect to the gas container unit 30A, as will be described in detail later, vaporized gas is sent from the gas container 31 to the gas phase G2 of the tank 20, and the pressure of the tank is, for example, Pressurized to 6 barG. The liquefied gas is sent from the liquid phase G1 in the tank 20 to the liquefied gas discharge line 21 by the pressure of the tank 20, and the liquefied gas is discharged from the tank toward the propulsion main machine and related equipment. In the gas container unit 30A, first, the adjustment valves 55 and 56 of the gas container unit 30A are opened, and the circulation pump 54 of the cooling device 50 is operated to circulate the heat medium. Then, in the cooling device 50, glycol or the like returned from the bus 32 via the cooling medium return line 52 by exchanging heat using the liquefied gas discharged from the tank in the liquefied gas discharge line 21 as a cold heat source. The heat medium is cooled. The cooled heat medium is sent into the bus 32 through the cooling medium supply line 51. Thereby, the heat medium in the bath 32 is cooled to, for example, −40 ° C. Then, each gas container 31 of the gas container unit 30A is cooled by the heat medium cooled to −40 ° C., and the pressure of the gas container 31 is reduced to, for example, 5 barG.

On the other hand, the regulating valve 36 of the liquefied gas filling line 34 and the regulating valve 38 of the branch line 34a of each gas container 31 are opened.
Thereby, a part of the liquefied gas sent out from the liquefied gas discharge line 21 has a pressure (5 barG) lower than the tank pressure (6 barG) via the liquefied gas filling line 34. It is fed into the gas container 31. The filling amount of the liquefied gas in the gas container 31 is determined by the temperature and pressure in the gas container 31.

  As shown in FIG. 2, after filling the liquefied gas, the adjustment valves 55 and 56 of the gas container unit 30A and the adjustment valve 38 of the branch line 34a of each gas container 31 are closed to complete the liquefied gas filling process. The adjustment valve 36 of the liquefied gas filling line 34 is opened when other gas container units are filled with liquefied gas (not shown), and other gas container units are not filled with liquefied gas (not shown). Is closed.

  Next, as shown in FIG. 2, in the gas container unit 30B, the cooling medium supply line adjustment valve 55 and the cooling medium return line adjustment valve 56 are opened to guide the heat medium in the bus 32 to the cooling device 50 for cooling. The gas container 31 is cooled by circulating the heat medium that returns the heat medium returned to the bus 32. The circulation of the heat medium is continued until the pressure in the gas container is lower than the tank pressure, for example, 5 barG.

(Pressure increase process)
As shown in FIG. 3, in the gas container unit 30A, the heating medium supply line 41 and the heating medium return line are operated in a state where the circulation pump 44 of the heating device 40 is operated during the gas releasing process in the other gas container unit 30C. 42 adjustment valves 45 and 46 are opened. Then, the heat medium in the bus 32 is sent to the heating device 40 through the heating medium return line 42. In the heating device 40, the heat medium exchanges heat using seawater or steam discharged on the propulsion main engine side as a heat source, and is heated to, for example, 20 ° C. The heated heat medium is fed into the bus 32 through the heating medium supply line 41.
Then, the liquefied gas in the gas container 31 is heated and vaporized by the heat medium in the bath 32, and the pressure of the gas container increases. The circulation of the heat medium is continued until the pressure in the gas container is higher than the tank pressure, for example, 12.5 barG. This target pressure is determined by the capacity and required pressure of the tank 20, the temperature, pressure, number, etc. of the gas container 31.

(Gas release process)
Next, as shown in FIGS. 4 and 5, in the gas container unit 30 </ b> A, the adjustment valve 39 of each branch line 35 a of the tank pressurization line 35 is opened. The adjustment valve 37 of the tank pressurization line 35 is already open when the tank is pressurized by the gas container unit 30C described above, and thus is kept open here. As a result, the gas generated by the vaporization of the liquefied gas in the gas container 31 is sent from the branch line 35a through the tank pressurization line 35 to the gas phase G2 of the tank 20. In FIG. 4, in the gas container unit 30B, the heat medium L of the bath 32 is cooled, and in FIG. 5, the filling process is started in the gas container unit 30B. Further, in FIG. 4, the gas container unit 30 </ b> C shows a state in which the gas releasing process has already been completed. It is preferable to start the 30A outgassing step.

  Thus, when the gas generated by vaporizing the liquefied gas is sent to the gas phase G2 in the tank 20, the pressure of the gas phase G2 increases. By this pressure, the liquid phase G1 in the tank 20 is pressurized, and the liquefied gas is sent to the liquefied gas discharge line 21.

In each gas container 31, the amount of gas generated by vaporizing the liquefied gas is determined by the temperature and pressure. When the pressure in the gas container 31 is close to the tank pressure, for example, 6.5 barG, the delivery of gas from the gas container is stopped.
Thereafter, the gas release step is completed by closing the adjustment valves 45 and 46 of the heating medium supply line 41, the heating medium return line 42, and the adjustment valve 39 of each branch pipe 35a of the tank pressurization line. About the adjustment valve 37 of the tank pressurization line 35, since the gas discharge | release process of another gas container unit has started, it keeps opening.

Thereafter, the above-mentioned “liquefied gas filling step”, “pressure increase step”, and “gas release step” are sequentially repeated.
At this time, it is preferable to start the gas releasing process of another gas container unit before the gas releasing process of one gas container unit is completed for continuous tank pressurization.

  By the way, when leakage of liquefied gas occurs in the tank side flange connection part of the discharge adjusting valve 22 of the liquefied gas discharge line 21 above the tank 20, the on-off valve 23a of the pressure equalizing line 23 is opened, Since the liquefied gas discharge line 21 communicates with the gas phase G2 in the tank 20 and the pressure is balanced, the leakage of the liquefied gas can be quickly accommodated.

As described above, after a part of the liquefied gas in the tank 20 is taken out and filled in the gas container 31, the gas generated by heating the liquefied gas in the gas container 31 is supplied into the tank 20. The liquefied gas in the tank 20 was discharged.
As a result, the liquefied gas can be dispensed without installing the piping connected to the bottom of the tank 20, which is necessary in the conventional tank pressurization type, and leakage from the piping connected to the bottom of the tank 20 Can be avoided.

  Further, since the liquefied gas in the tank 20 itself is used as a pressure source in order to discharge the liquefied gas in the tank 20 except when the tank pressurization is started, it is necessary to use a pressurized medium such as nitrogen gas, for example. It is possible to prevent a decrease in main engine output due to mixing of non-combustible gas such as nitrogen. Only at the start of tank pressurization, for example, a pressurizing medium such as nitrogen gas needs to be injected into the tank gas phase, but the injection amount is small and the influence can be ignored.

  Furthermore, since a plurality of gas container units 30 each having the gas container 31 are provided and the operation timing is shifted, the liquefied gas in the tank 20 can be continuously and stably discharged.

  In addition, a heating medium for heating the gas container 31 is heated by the heating device 40. In the heating device 40, seawater, steam discharged on the propulsion main unit side, etc., are used to heat the heating medium. Was used. If seawater is used, the cost will naturally be low, and if steam discharged on the propulsion main unit side is used, waste energy can be used effectively.

  On the other hand, the heat medium for cooling the gas container 31 is cooled by the cooling device 50, and in this cooling device 50, the liquefied gas discharged from the tank 20 is used as a cold heat source. The thermal energy transferred to the liquefied gas by the cooling device 50 becomes a part of the thermal energy required to vaporize the liquefied gas at the related equipment when supplying the gas fuel to the propulsion main engine side. Can be used.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a diagram illustrating a configuration of the liquefied gas supply facility 10B according to the present embodiment. The liquefied gas supply facility 10B shown in this figure is similar to the liquefied gas supply facility 10A of the ship shown in the first embodiment in most of the overall configuration. The description will be focused on the different configurations, and the same reference numerals are given to the configurations common to the first embodiment, and the description thereof will be omitted.
That is, as shown in FIG. 6, the liquefied gas supply facility 10B pumps the liquefied gas from the liquid phase G1 in the tank 20 with respect to the liquefied gas supply facility 10A shown in the first embodiment, and supplies the liquefied gas discharge line. The point provided with the electric pump (pump) 60 supplied to 21 differs from the said 1st Embodiment.

A suction port 61 a formed at the lower end portion of the pump discharge line 61 including the electric pump 60 is provided so as to be positioned at the bottom portion of the tank 20. The suction port 61a may be incorporated in the pump.
One end of the liquefied gas transfer line 62 is connected to the discharge port of the pump discharge line 61, and the other end of the liquefied gas transfer line 62 is connected to the downstream side of the discharge valve 22 in the liquefied gas discharge line 21. The liquefied gas transfer line 62 is provided with a pump discharge valve 63, and the opening and closing operation of the pump discharge valve 63 is controlled by a control device (not shown).

Such an electric pump 60 may be configured to constantly pump up the liquefied gas from the tank 20 and send it to the liquefied gas discharge line 21 in parallel with the operation shown in the first embodiment.
Further, for example, when the liquefied gas slosh is generated in the tank 20, the pressure of the gas phase G2 in the tank 20 may be lowered. As a result, the gas container 31 can be filled with the liquefied gas, and the liquefied gas can be stably supplied to the propulsion main machine and related equipment.

  Further, as shown in FIG. 6, it is preferable to use an electric pump 60 that can be extracted from the upper part of the tank 20 in consideration of maintainability.

The configurations shown in the first and second embodiments can be changed as appropriate within the scope of the gist of the present invention.
For example, the number, shape, volume, pressure and the like of the gas containers 31 constituting each gas container unit 30 are not limited at all.
Moreover, in the said embodiment, although 3 sets of gas container units 30 were provided, if 2 or more sets are provided so that a liquefied gas filling process and a gas discharge process can be performed alternately, the number of sets is limited at all. Not what you want. Of course, four or more sets of gas container units 30 may be provided.
Further, the operations of the plurality of gas container units 30 are not switched at the same time, but the gas discharge process may be wrapped at the switching timing so that the gas discharge process is continuously performed without interruption.

  By the way, seawater or the like is used to heat the gas container 31, but if the gas container 31 does not have a heat insulating structure, the temperature in the gas container 31 can be set according to the temperature of the surrounding atmosphere without using a heat medium. It is possible to raise and vaporize the liquefied gas.

10A, 10B Liquefied gas supply equipment 20 Tank 21 Liquefied gas discharge line 22 Discharge valve 23 Pressure equalizing line 30, 30A, 30B, 30C Gas container unit 31 Gas container 32 Bus 34 Liquefied gas filling line 35 Tank pressure line 40 Heating device 41 Heating medium supply line 42 Heating medium return line 50 Cooling device 51 Cooling medium supply line 52 Cooling medium return line 60 Electric pump (pump)
61 Pump discharge line G1 Liquid phase G2 Gas phase L Heat medium

Claims (8)

Equipped with liquefied gas supply equipment that supplies liquefied gas to the main propulsion machine and related equipment,
The liquefied gas supply equipment is
A tank for storing the liquefied gas;
A gas container capable of branching and storing a part of the liquefied gas discharged from the tank;
A cooling device that fills the gas container with a part of the liquefied gas discharged from the tank by cooling the gas container to a pressure lower than that of the tank;
A heating device that heats the gas container and vaporizes the liquefied gas filled in the gas container to obtain a pressure higher than that of the tank;
A tank pressurizing line for sending the gas fuel vaporized in the gas container to the tank and pressurizing the tank;
A liquefied gas discharge line for discharging the liquefied gas from the pressurized tank toward the propulsion main machine and the related equipment;
A liquefied gas filling line that branches from the liquefied gas discharge line and fills the gas container with the liquefied gas;
A ship characterized by comprising. The gas container is provided with a plurality of sets,
The gas vaporized from another set of the gas containers is fed into the tank through the tank pressurization line while the set of the gas containers is filled with the liquefied gas. The ship according to 1.   The cooling device performs heat exchange with a heat medium using the liquefied gas delivered from the tank through the liquefied gas discharge line as a cold heat source, and cools the gas container with the heat medium. The ship according to 1 or 2.   2. The heating device heat-exchanges with the heat medium using seawater or steam discharged from the propulsion main engine as a heat source, and heats the gas container with the heat medium. The ship according to any one of items 3 to 3.   The ship according to any one of claims 1 to 4, further comprising a pressure equalizing pipe that communicates the liquefied gas discharge line and the gas phase in the tank.   The ship according to any one of claims 1 to 5, further comprising a pump that sucks up the liquefied gas in the tank and feeds the liquefied gas into the gas container. A liquefied gas supply facility that supplies liquefied gas to the main propulsion machine and related equipment,
A tank for storing the liquefied gas;
A plurality of sets of gas containers capable of branching and storing a part of the liquefied gas discharged from the tank;
A cooling device that fills the gas container with a part of the liquefied gas discharged from the tank by cooling the gas container to a pressure lower than that of the tank;
A heating device that heats the gas container and vaporizes the liquefied gas filled in the gas container to obtain a higher pressure than the tank;
A tank pressurizing line for sending the vaporized gas in the gas container to the tank and pressurizing the tank;
A liquefied gas discharge line for discharging the liquefied gas from the pressurized tank toward the propulsion main machine and the related equipment;
A liquefied gas supply facility comprising: a liquefied gas filling line that branches from the liquefied gas discharge line and fills the gas container with the liquefied gas. A method for operating a liquefied gas supply facility according to claim 7,
Cooling the gas container and filling the gas container with a part of the liquefied gas from the tank;
A gas release step of heating the gas container to vaporize the liquefied gas filled in the gas container and sending it to the tank gas phase section to pressurize the liquefied gas in the tank. Operation method of gas supply equipment.

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