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CN115405854A - Pressure control system and method for liquid nitrogen storage tank and nitrogen distribution pipeline - Google Patents

Pressure control system and method for liquid nitrogen storage tank and nitrogen distribution pipeline Download PDF

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Publication number
CN115405854A
CN115405854A CN202211026053.1A CN202211026053A CN115405854A CN 115405854 A CN115405854 A CN 115405854A CN 202211026053 A CN202211026053 A CN 202211026053A CN 115405854 A CN115405854 A CN 115405854A
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CN
China
Prior art keywords
pressure
storage tank
nitrogen
pressure control
valve
Prior art date
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Granted
Application number
CN202211026053.1A
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Chinese (zh)
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CN115405854B (en
Inventor
唐玉宝
延宗昳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
Original Assignee
China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
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Application filed by China General Nuclear Power Corp, China Nuclear Power Engineering Co Ltd, CGN Power Co Ltd, Shenzhen China Guangdong Nuclear Engineering Design Co Ltd filed Critical China General Nuclear Power Corp
Priority to CN202211026053.1A priority Critical patent/CN115405854B/en
Publication of CN115405854A publication Critical patent/CN115405854A/en
Application granted granted Critical
Publication of CN115405854B publication Critical patent/CN115405854B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/0126—One vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0192—Propulsion of the fluid by using a working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/025—Reducing transfer time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to a pressure control system and a method for a liquid nitrogen storage tank and a nitrogen distribution pipeline, which relate to the technical field of liquid nitrogen pressure control, wherein the pressure control system controls the pressure of the storage tank independently through a tank body pressure control mechanism and supplies nitrogen to downstream users independently through a nitrogen distribution mechanism; so, avoid the delivery pipeline relief valve to appear blocking because of triggering repeatedly and opening, reduce low reaches user's with nitrogen risk, effectively improve with nitrogen security.

Description

Pressure control system and method for liquid nitrogen storage tank and nitrogen distribution pipeline
Technical Field
The invention relates to the technical field of liquid nitrogen pressure control, in particular to a system and a method for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline.
Background
In the nuclear power field, a liquid nitrogen storage tank and a nitrogen distribution pipeline are used for directionally transmitting nitrogen discharged from the nitrogen storage tank, generally speaking, liquid nitrogen is contained in the nitrogen storage tank, and the liquid nitrogen is further transmitted after being gasified and expanded in volume so as to improve the storage convenience of the nitrogen and reduce the supplement frequency of the nitrogen; however, the liquid nitrogen in the nitrogen storage tank has a very large temperature difference with the outside, and the temperature and the pressure are increased more or less, so that the pressure in the nitrogen distribution pipeline is increased, and the nitrogen use risk of a nitrogen terminal on the downstream of the nitrogen distribution pipeline is increased;
in view of this, the related art has long adopted a liquid nitrogen storage tank and a nitrogen distribution piping system as shown in fig. 1, but the liquid nitrogen storage tank and the nitrogen distribution piping system have encountered the following technical problems in use:
when the pressure in the storage tank reaches 1.4MPa, the redundant gas nitrogen is transmitted to each downstream user 20, so that the pressure of the storage tank is balanced to avoid the overhigh pressure of the storage tank 40, however, the pressure in the downstream pipeline 30 is continuously increased because the nitrogen amount required by the downstream user 20 in a normal working state is very small, at the moment, the downstream safety valve 50 only needs to avoid the overhigh nitrogen pressure of a user end to set the opening pressure to be lower, and the storage tank safety valve 60 sets the opening pressure to be higher because the design and use requirements need to be met, so that the safety valve of the storage tank always does not reach the opening pressure, and the safety valve at the downstream user end is repeatedly triggered to open;
thus, when the downstream safety valve fails to open normally and the nitrogen pressure in the pipeline is not enough to drive the safety valve of the storage tank to open, the nitrogen pressure in the pipeline will gradually rise to the opening pressure of the safety valve of the storage tank, and under the pressure condition, the downstream nitrogen user end will bear a very operation risk.
Disclosure of Invention
The invention aims to provide an improved system and method for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the application provides a liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system, which comprises a tank body pressure control mechanism communicated with the storage tank to control the pressure in the tank and a distribution mechanism communicated with the storage tank to deliver nitrogen to downstream users;
the tank body pressure control mechanism comprises a pressure control pipe group communicated with the storage tank and a discharge valve arranged on the pressure control pipe group; the discharge valve is used for opening and closing according to the pressure value in the pressure control pipe group, so that the storage tank is communicated or blocked with the outside, and the pressure in the pressure control pipe group is limited within a conveying pressure interval value;
the distribution mechanism comprises a distribution pipe group communicated with the downstream user and the storage tank and a distribution pipeline safety valve arranged on the distribution pipe group, the distribution pipeline safety valve is used for discharging and relieving pressure of the distribution pipe group when the distribution pipe safety valve is opened, and the opening pressure of the distribution pipeline safety valve is larger than the maximum value of the conveying pressure interval value.
In some embodiments, the tank pressure control mechanism further comprises a pressure switch for sensing pressure in the pressure control tube set, the pressure switch being connected to the bleed valve control signal.
In some embodiments, the tank pressure control mechanism further comprises a first isolation valve and a second isolation valve disposed on the pressure control line set, the relief valve being located between the first isolation valve and the second isolation valve.
In some embodiments, the tank pressure control mechanism further comprises a normally closed bypass valve arranged in parallel with the relief valve, the normally closed bypass valve being configured to vent the storage tank to atmosphere when opened.
In some embodiments, the tank pressure control mechanism further comprises a self-pressurization pipeline, both ends of which are communicated with the storage tank, and a self-pressurization device arranged on the self-pressurization pipeline;
the self-pressurization device is used for guiding liquid nitrogen led out from the bottom of the storage tank through the self-pressurization pipeline to carry out gasification pressurization, the pressurized nitrogen gas flows back to the storage tank through the self-pressurization pipeline, and the pressure control pipe group is communicated with the self-pressurization pipeline and is used for guiding the pressurized nitrogen.
In some embodiments, the tank pressure control mechanism further comprises a pressure regulating valve arranged on the self-pressurization pipeline, the pressure regulating valve opens the self-pressurization pipeline for pressurization, and the pressure regulating valve closes and cuts off the self-pressurization pipeline for stopping pressurization.
In some embodiments, the dispensing mechanism further comprises a liquid nitrogen vaporizer disposed on the dispensing tube bank, the liquid nitrogen vaporizer being connected to vaporize liquid nitrogen derived from the storage tank via the dispensing tube bank, the nitrogen being delivered to downstream customers via the dispensing tube bank.
In some embodiments, the nitrogen dispensing pipeline pressure control system further comprises a tank protection mechanism;
the tank body protection mechanism comprises a protection safety valve arranged on the tank body and a rupture disc arranged on the tank body; the protection safety valve is used for opening when the pressure in the storage tank reaches a first protection pressure of the tank body so as to discharge the storage tank in a pressure relief mode, and the rupture disc is used for breaking when the pressure in the storage tank reaches a second protection pressure of the tank body so as to discharge the storage tank in a pressure relief mode.
In some embodiments, the tank protection mechanism further comprises a normally closed drain valve in communication with the storage tank for draining the storage tank when open.
In another aspect, the present invention further provides an improved method for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline, wherein the method for controlling the pressure of the nitrogen distribution pipeline adopts the pressure control system of the liquid nitrogen storage tank and the nitrogen distribution pipeline in any one of the above technical solutions; the pressure control method of the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
s1, guiding nitrogen in a storage tank to a pressure control pipe group and a distribution pipe group respectively;
s2, detecting the pressure in the pressure control pipe group, and controlling a relief valve to open when the pressure in the pressure control pipe group exceeds the maximum value of the conveying pressure interval value, so that nitrogen in the storage tank is led out through the pressure control pipe group;
when the pressure in the pressure control pipe group is smaller than the minimum value of the conveying pressure interval value, controlling the discharge valve to be closed so as to block the nitrogen discharge of the storage tank;
s3, when the pressure in the distribution pipe group meets the opening pressure of the distribution pipeline safety valve, the distribution pipeline safety valve is opened to discharge and release the pressure of the distribution pipe group; wherein the opening pressure of the delivery line relief valve is configured to be greater than the maximum value of the delivery pressure interval value.
In some embodiments, in step S2, the pressure in the pressure control line set is detected by a pressure switch.
In some embodiments, in step S2, if the drain valve is stuck, the storage tank is vented by opening a normally closed bypass valve.
The system and the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline have the following beneficial effects:
the invention relates to a pressure control system and a method for a liquid nitrogen storage tank and a nitrogen distribution pipeline, which relate to the technical field of liquid nitrogen pressure control, wherein the pressure control system controls the pressure of the storage tank independently through a tank body pressure control mechanism and supplies nitrogen to downstream users independently through a distribution mechanism; so, avoid the delivery pipeline relief valve to appear blocking because of triggering repeatedly and opening, reduce low reaches user's with nitrogen risk, effectively improve with nitrogen security.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram showing the construction of a liquid nitrogen storage tank and a nitrogen distribution piping system in the related art;
FIG. 2 is a schematic diagram of the configuration of the liquid nitrogen storage tank and nitrogen distribution piping pressure control system in a preferred embodiment of the present invention;
FIG. 3 is an enlarged view of the liquid nitrogen storage tank and nitrogen distribution piping pressure control system of FIG. 2 at A;
FIG. 4 is an enlarged view of the liquid nitrogen storage tank and nitrogen distribution piping pressure control system of FIG. 2 at B;
FIG. 5 is a flow chart of a method for controlling the pressure of a liquid nitrogen storage tank and nitrogen distribution piping in accordance with a preferred embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
FIG. 2 illustrates a liquid nitrogen storage tank and nitrogen distribution piping pressure control system 10 for delivering nitrogen from a storage tank to a downstream user and for regulating the nitrogen pressure during delivery in some preferred embodiments of the present invention.
As shown in fig. 2-4, a liquid nitrogen storage tank and nitrogen dispensing line pressure control system 10 includes a tank pressure control mechanism 2 in communication with a storage tank 1 to control the pressure within the tank and a dispensing mechanism 3 in communication with the storage tank 1 to deliver nitrogen to a downstream customer 5.
The storage tank 1 is used for containing nitrogen, including liquid nitrogen and gaseous nitrogen; the pressure in the storage tank needs to be kept in a certain pressure interval, and the pressure interval is adjusted according to design and use requirements. The tank pressure control means 2 is for adjusting the tank pressure of the tank 1 to within a predetermined pressure range. The dispensing means 3 is used to deliver nitrogen from the tank 1 to the downstream user 5. Downstream users 5 generally refer to areas, equipment, devices, mechanisms, and nitrogen delivery points, etc. where nitrogen is needed.
It should be noted that the dispensing mechanism 3 and the tank pressure control mechanism 2 are independent from each other, and the nitrogen discharged by unloading from the tank pressure control mechanism 2 will not be transmitted to the downstream customer 5, but will be directly discharged to the outside, so as to avoid the excessive increase of the nitrogen pressure at the dispensing mechanism 3 and the downstream customer 5.
The tank pressure control means 2 includes a pressure control pipe group 21 communicating with the tank 1, and a bleed valve 22 provided in the pressure control pipe group 21; the discharge valve 22 is used for opening and closing according to the pressure value in the pressure control pipe group 21, so as to communicate or block the storage tank 1 with the outside, and further limit the pressure in the pressure control pipe group 21 within the conveying pressure interval value.
It will be appreciated that the pressure control line set 21 is used to tap nitrogen from the tank 1 and to direct it along a predetermined trajectory, and the drain valve 22 is used to open or block the pressure control line set 21.
It can also be understood that a pressure sensor commonly used in the related art may be used to obtain a nitrogen pressure value in the pressure control pipe group 21, then compare the nitrogen pressure value with two end values of a preset delivery pressure interval value, and then control the opening or closing of the bleed valve 22 according to the comparison result; when the relief valve 22 is opened, the storage tank 1 is directly communicated with the outside through the pressure control pipe group 21, and nitrogen in the storage tank 1 is directly discharged and discharged for unloading; when the relief valve 22 is closed, the pressure control pipe group 21 is blocked to cut off the communication between the storage tank 1 and the outside; of course, other components in the prior art may also be used to detect the nitrogen pressure in the pressure control tube set 21, or the nitrogen pressure detecting element may be directly integrated on the bleed valve 22; the pressure detection method and the specific installation position of the pressure control tube group 21 are not exclusive, and the nitrogen pressure flowing to the bleed valve 22 may be detected.
It should be noted that the pressure control pipe group 21 may be configured by splicing a plurality of pipes, or may be composed of only one pipe, and is flexibly set depending on the installation site. When the pressure interval value of the discharge valve 22, namely the pressure value required by the pressure control pipe group 21 is too low, the discharge valve 22 is closed, self-pressurization is carried out by a self-pressurization structure of the liquid nitrogen storage tank and the nitrogen distribution pipeline pressure control system 10, specifically, liquid nitrogen is led out and gasified and then flows back to the storage tank 1, and the purpose of increasing the pressure of the storage tank 1 is achieved; when the pressure is too high, the relief valve 22 is opened, and the pressure control pipe group 21 directly discharges the redundant nitrogen to the outside, so as to achieve the purpose of reducing the pressure of the storage tank 1, wherein the pressure range is a conveying pressure interval value, and the maximum pressure value and the minimum pressure value are respectively two end values of the conveying pressure interval value.
It should be noted that the lowest pressure of the storage tank 1 is set to ensure the lowest pressure of the nitrogen to be delivered to the distribution mechanism 3, and the nitrogen delivered under the lowest pressure is further delivered to downstream users after being gasified, so that the lowest pressure of the nitrogen to be used by the downstream users can be met; after the nitrogen conveyed at the highest pressure is gasified, the over-high nitrogen pressure of downstream users can be avoided, and the nitrogen using safety of the downstream users is ensured.
The delivery means 3 includes a delivery pipe group 31 for communicating a downstream user with the tank 1, and a delivery safety valve 32 provided in the delivery pipe group 31, the delivery safety valve 32 being configured to discharge and release the delivery pipe group 31 when opened, and the opening pressure of the delivery safety valve 32 being greater than the maximum value of the delivery pressure range.
As will be appreciated, the dispensing tube set 31 is used to direct the nitrogen delivery to downstream users; the dispensing safety valve 32 is used to define the highest pressure of the dispensing tube set 31 to avoid over-pressurization of the dispensing tube set 31.
It should be noted that the distribution pipe group 31 may be configured to be formed by splicing a plurality of pipes, or may be formed by only one pipe, and is flexibly set according to an installation site and the number of downstream users, and of course, the distribution pipe group 31 may include a delivery joint, a control device, and the like in addition to the pipes.
In addition to the above, it should be noted that, since the storage tank 1 is connected to the pressure control pipe group 21 and the distribution pipe group 31, respectively, the pressure of the storage tank 1 is equal to the pressure in the pressure control pipe group 21, the pressure of the storage tank 1 is also equal to the pressure in the distribution pipe group 31 before the liquid nitrogen is gasified, that is, the pressure in the pipe for guiding the liquid nitrogen from the storage tank 1 to the liquid nitrogen gasification element by the distribution pipe group 31 is equal to the pressure of the storage tank 1.
In summary, in the practical application process, when the pressure in the storage tank 1 does not meet the requirement of the lowest nitrogen pressure, that is, when the pressure in the storage tank 1 is smaller than the minimum value of the conveying pressure interval value, the storage tank 1 will perform self-pressurization in a manner that the liquid nitrogen is gasified and flows back to the storage tank 1, and at this time, the relief valve 22 remains closed; when the pressure in the storage tank 1 reaches the highest nitrogen pressure, namely the pressure in the storage tank 1 reaches the maximum value of the conveying pressure interval value, the storage tank 1 stops self-pressurization; then, if the pressure in the storage tank 1 continuously rises and exceeds the maximum value of the conveying pressure interval value, the discharge valve 22 is opened, the nitrogen in the storage tank 1 is directly discharged to the outside through the pressure control pipe group 21 for pressure relief, when the pressure in the pressure control pipe group 21 is reduced to be less than or equal to the minimum value of the conveying pressure interval value, the discharge valve 22 is closed, the pressure relief is stopped, and the storage tank 1 is continuously pressurized; thus, the pressure in the pressure control pipe group 21 is always controlled within the pressure range of the conveying pressure interval value under the cyclic reciprocating, that is, the pressure in the pipeline before the storage tank 1 is conveyed to the distribution pipe group 31 for gasification is always controlled within the pressure range of the conveying pressure interval value, so that the nitrogen pressure before gasification for conveying to the downstream user is controlled within the pressure range of the conveying pressure interval value, and the pressure after the gasification of the liquid nitrogen is ensured to be always controlled within the nitrogen use pressure requirement range of the downstream user; in this way, the regulation of the nitrogen use pressure of the downstream user is mainly regulated by the bleed valve 22;
on the basis, the opening pressure of the delivery pipeline safety valve 32 is configured to be larger than the maximum value of the nitrogen use pressure requirement range of the downstream user, and the opening pressure of the delivery pipeline safety valve 32 is larger than the maximum value of the conveying pressure interval value for driving the release valve 22 to open, so that in the actual use process, the release valve 22 is opened and decompressed in preference to the delivery pipeline safety valve 32, the nitrogen use pressure of the downstream user is reduced, and compared with a mode that the adjustment is performed by excessively depending on a safety valve on the side of the downstream user in the related art, the repeated opening of the safety valve on the side of the downstream user is avoided, the blocking risk of the safety valve on the side of the downstream user is reduced, and the nitrogen use safety of the downstream user is effectively improved.
As shown in fig. 2 and 3, the tank pressure control mechanism 2 further includes a pressure switch 23 for sensing the pressure in the pressure control pipe set 21, and the pressure switch 23 is connected with the drain valve 22 in control signal.
It is to be understood that the control signal connections are electrical connections, and in particular, the two are connected by, for example, a voltage signal or other signal. The pressure switch 23 and the discharge valve 22 are in linkage relation, and the discharge valve 22 is controlled to be opened and closed according to the pressure value in the tube group 21 controlled by the induction pressure detected by the pressure switch 23.
As shown in fig. 2 and 3, the tank pressure control mechanism 2 further includes, in some embodiments, a first isolation valve 24 and a second isolation valve 25 disposed on the pressure control line set 21, with the drain valve 22 being located between the first isolation valve 24 and the second isolation valve 25.
It will be appreciated that first isolation valve 24 and second isolation valve 25 are connected in series with the bleed valve 22, the first isolation valve 24 being operable to block nitrogen flow to the bleed valve 22 and the second isolation valve 25 being operable to block nitrogen bleed from the bleed valve 22. The two stop valves can realize the isolation of pipeline areas with different degrees, and are convenient for overhaul, pipeline change and the like.
As shown in fig. 2 and 3, tank pressure control mechanism 2, in some embodiments, further includes a normally closed bypass valve 26 disposed in parallel with relief valve 22, normally closed bypass valve 26 being used to vent relief tank 1 from ambient when opened.
It will be appreciated that the normally closed bypass valve 26 is normally closed off under normal use conditions and that nitrogen directed to the bleed valve 22 cannot be vented directly through the bypass in which the normally closed bypass valve 26 is located. For example, when the relief valve 22 fails to open due to a failure, the bypass valve 26 is opened to override the branch where the relief valve 22 is located, and the nitrogen in the pressure control tube group 21 is discharged directly to the outside through the branch where the normally closed bypass valve 26 is located in the open state, and is discharged while bypassing the relief valve 22.
As shown in fig. 2 and 4, the tank pressure control mechanism 2 further includes a self-pressurization pipe 27 communicating with the storage tank 1 at both ends thereof, and a self-pressurizer 28 provided on the self-pressurization pipe 27 in some embodiments. The self-pressurizing device 28 is used for guiding the liquid nitrogen led out from the bottom of the storage tank 1 through the self-pressurizing pipeline 27 to carry out gasification pressurization, the pressurized nitrogen flows back to the storage tank 1 through the self-pressurizing pipeline 27, and the pressure control pipe group 21 is communicated with the self-pressurizing pipeline 27 and is used for guiding the pressurized nitrogen.
It is understood that the self-pressurization pipeline 27 can be configured to be connected by one or more pipelines, and the design structure and the application requirements of the product can be flexibly adjusted. The self-pressurizing unit 28 may be a component or structure capable of exchanging heat between liquid nitrogen and the outside in the related art.
The liquid nitrogen is led out from the bottom of the storage tank 1 through the self-pressurization pipeline 27 and then sent to the self-pressurization device 28 for gasification pressurization, specifically, the liquid nitrogen exchanges heat with the outside on the self-pressurization device 28, the liquid nitrogen with increased heat quantity is gasified and expanded into a gaseous state, and the gaseous nitrogen with higher pressure flows back to the storage tank 1 to increase the pressure of the storage tank 1, so that the self-pressurization is realized.
It should also be noted that the connection position of the pressure control tube set 21 and the self-pressurization pipe 27 is preferably configured to be located downstream of the self-pressurization device 28, that is, the relief valve 22 is mainly used for regulating the pressure of the gasified gas to form gaseous nitrogen, and generally, the overpressure of the liquid nitrogen is directly discharged with a large risk coefficient. The opening of the bleed valve 22 allows simultaneous venting of both the vaporized gaseous nitrogen and the gaseous nitrogen at the top of the tank 1, the overall pressure being controlled.
As shown in fig. 4, the tank pressure control mechanism 2 may further include a pressure regulating valve 29 disposed on the self-pressurization pipe 27, wherein the pressure regulating valve 29 opens the self-pressurization pipe 27 to perform pressurization, and the pressure regulating valve 29 closes the self-pressurization pipe 27 to stop pressurization.
It is understood that the pressure regulating valve 29 may be an electrically controlled valve or a mechanically controlled valve, and when the pressure in the storage tank 1 is lower than the minimum pressure required for transmission, the pressure regulating valve 29 is opened and the self-pressurization pipeline 27 is opened, so that the nitrogen in the storage tank 1 can be gasified and pressurized along the self-pressurization pipeline 27 and flow back to the storage tank 1, thereby completing the self-pressurization.
As shown in fig. 2, the dispensing mechanism 3 further comprises a liquid nitrogen vaporizer 33 disposed on the dispensing pipe set 31, the liquid nitrogen vaporizer 33 is connected to vaporize the liquid nitrogen derived from the storage tank 1 through the dispensing pipe set 31, and the nitrogen is delivered to the downstream user through the dispensing pipe set 31.
As will be appreciated, the liquid nitrogen vaporizer 33 serves to vaporize liquid nitrogen, and the liquid nitrogen absorbs heat to be vaporized while flowing through the liquid nitrogen vaporizer 33. The pressure of the gaseous nitrogen formed after the gasification by the liquid nitrogen vaporizer 33 rises, and the gaseous nitrogen is further supplied to the downstream users.
As shown in fig. 2 and 3, the nitrogen distribution piping pressure control system 10 also includes, in some embodiments, a tank protection mechanism 4; the tank protection mechanism 4 is used for pressure protection of the storage tank 1.
The tank protection mechanism 4 comprises a protection safety valve 41 arranged on the tank and a rupture disk 42 arranged on the tank; the protection safety valve 41 is used for opening when the pressure in the storage tank 1 reaches the first protection pressure of the tank body so as to discharge the storage tank 1 in a pressure relief mode, and the rupture disk 42 is used for rupturing when the pressure in the storage tank 1 reaches the second protection pressure of the tank body so as to discharge the storage tank 1 in a pressure relief mode.
It is understood that the protection safety valve 41 may be directly disposed on the storage tank 1, or may be communicated with the storage tank 1 through a pipe, the number of the protection safety valves 41 may be one or more, and the plurality of protection safety valves 41 may be disposed to ensure that there is redundant normal operation to complete the pressure relief protection when part of the protection safety valves 41 fail. The rupture disk 42 directly explodes to form a gap when exceeding rated pressure, forms the exhaust normally open passageway of confession nitrogen, continuously carries out the pressure release to the basin 1 and discharges, and is same, and rupture disk 42's quantity equally can set up to a plurality ofly.
The rupture pressure of the rupture disk 42 is higher than the opening pressure of the relief valve 41, and the relief valve 41 preferentially releases the pressure of the tank 1. The opening pressures of the plurality of protection safety valves 41 may be the same or different, and are configured to be capable of performing staged pressure relief and discharge of the pressure in the storage tank 1 at different times; the burst pressure of the plurality of rupture discs 42 can also be flexibly set.
As shown in fig. 3, the tank protection mechanism 4 in some embodiments further comprises a normally closed drain valve 43 in communication with the storage tank 1, the normally closed drain valve 43 being used to vent the storage tank 1 when opened.
It can be understood that when the normally closed drain valve 43 is opened, the tank 1 can be directly decompressed and drained without passing through any valve body.
FIG. 5 illustrates a method of controlling the pressure of a liquid nitrogen storage tank and nitrogen distribution piping in accordance with certain preferred embodiments of the present invention, wherein the method employs the liquid nitrogen storage tank and nitrogen distribution piping pressure control system 10 shown in FIGS. 2-4 to controllably adjust the nitrogen distribution pressure;
the pressure control method for the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
s1, guiding nitrogen in a storage tank 1 to a pressure control pipe group 21 and a distribution pipe group 31 respectively;
it will be appreciated that the pressure control tube bank 21 and the dispensing tube bank 31 are in communication with the tank 1, respectively, such that nitrogen within the tank 1 can be directed to flow to the pressure control tube bank 21 and the dispensing tube bank 31, respectively.
It should be noted that the pressure control tube set 21 and the dispensing tube set 31 are not directly connected to each other, and the nitrogen discharged by the pressure relief of either one of the two does not flow into the other, i.e. the pressure relief of one does not cause the pressure of the other to increase.
S2, detecting the pressure in the pressure control pipe group 21, and controlling the relief valve 22 to be opened when the pressure in the pressure control pipe group 21 exceeds the maximum value of the conveying pressure interval value, so that nitrogen in the storage tank 1 is led out through the pressure control pipe group 21;
when the pressure in the pressure control pipe group 21 is smaller than the minimum value of the delivery pressure interval, the bleed valve 22 is controlled to be closed, thereby blocking the nitrogen discharge from the storage tank 1;
it is understood that the detected pressure value of the pressure control tube group 21 is compared with the two end values of the delivery pressure interval value, one of which is the interval maximum value and the other is the interval minimum value.
If the pressure value of the pressure control pipe group 21 is larger than the maximum value of the conveying pressure interval value, the relief valve 22 is controlled to be opened, and nitrogen in the storage tank 1 is directly discharged to the outside; if the pressure value of the pressure control pipe group 21 is smaller than the minimum value of the conveying pressure interval value, the control relief valve 22 is closed, and the pressure relief is stopped.
It should be noted that once the pressure value of the pressure control tube set 21 satisfies the opening condition of the relief valve 22, the relief valve 22 can be opened, and once the relief valve 22 is opened, it needs to be re-closed when the pressure value of the pressure control tube set 21 is reduced to the minimum value of the conveying pressure interval value. Once the relief valve 22 is closed, it needs to be opened when the pressure value of the pressure control pipe group 21 exceeds the maximum value of the conveying pressure interval value; thus, the pressure of the pressure control pipe group 21 is always controlled within the range of the conveying pressure interval value;
in this way, under the condition that the nitrogen delivery pressure is stable, the nitrogen delivery pressure for further delivering the gasified nitrogen to the downstream user is also stable, specifically, because the expansion of the liquid nitrogen is stable, the pressure before the expansion is limited, and the pressure after the expansion is also stable;
s3, when the pressure in the distribution pipe group 31 meets the opening pressure of the distribution pipeline safety valve 32, the distribution pipeline safety valve 31 is opened to discharge and release the pressure of the distribution pipe group 31; the opening pressure of the delivery line relief valve 32 is set to be greater than the maximum value of the delivery pressure range.
It will be appreciated that the pressure in the dispensing tube bank 31 is also the pressure of the downstream user's nitrogen, and in particular the pressure of the vaporized nitrogen that is formed in the dispensing tube bank 31. Normally, the delivery line safety valve 32 is not operated because the internal pressure of the delivery pipe group 31 before vaporization is equal to the internal pressure of the storage tank 1, and the internal pressure of the storage tank 1 is adjusted by the discharge valve 22 so that the nitrogen pressure fed to the upstream end of the liquid nitrogen vaporizer 33 via the storage tank 1 is maintained within a certain range, and if the pressure of the storage tank 1 rises, the nitrogen pressure of the storage tank 1 is preferentially adjusted by the discharge valve 22, that is, the nitrogen pressure fed to the liquid nitrogen vaporizer 33 is preferentially adjusted without depending on the delivery line safety valve 32 located after the liquid nitrogen vaporizer 33. The distribution pipeline safety valve 32 is prevented from being repeatedly and frequently opened and stuck, and the nitrogen using risk of downstream users is effectively reduced.
Specifically, in some embodiments of step S2, the pressure in the pressure control tube group 21 is detected by the pressure switch 23.
It will be appreciated that the position in which the pressure switch 23 is arranged is very flexible, as long as the pressure at the position in which it is arranged corresponds directly to the nitrogen pressure of the bleed valve 22. Secondly, a control element can be additionally arranged to receive pressure data measured by the pressure switch 23 and control the opening and closing of the relief valve 22 according to the pressure data; of course, the linkage of the pressure switch 23 and the relief valve 22 may be achieved by other electrical structures.
In some embodiments of step S2, if drain valve 22 is stuck, tank 1 is vented by opening normally closed bypass valve 26.
It will be appreciated that the normally-closed bypass valve 26 is preferably configured as a manually-operated valve, particularly for effecting override of the bleed valve 22 when required, to discharge nitrogen within the tank 1 directly to the exterior.
The system and the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline have the following beneficial effects:
the invention relates to a pressure control system and a method for a liquid nitrogen storage tank and a nitrogen distribution pipeline, which relate to the technical field of liquid nitrogen pressure control, wherein the pressure control system independently controls the pressure of the storage tank through a tank body pressure control mechanism and independently supplies nitrogen to downstream users through the distribution mechanism, and particularly, before the nitrogen pressure in a distribution pipe group reaches the opening pressure of a safety valve of the distribution pipeline, the pressure of the storage tank is preferably actively discharged and decompressed through a discharge valve on a pressure control pipe group, and the nitrogen discharged and decompressed through the pressure control pipe group cannot be guided to the distribution mechanism; so, avoid the delivery pipeline relief valve to appear blocking because of triggering repeatedly and opening, reduce low reaches user's with nitrogen risk, effectively improve with nitrogen security.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (12)

1. A liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system is characterized by comprising a tank body pressure control mechanism communicated with the storage tank to control the pressure in the tank and a distribution mechanism communicated with the storage tank to convey nitrogen to downstream users;
the tank body pressure control mechanism comprises a pressure control pipe group communicated with the storage tank and a discharge valve arranged on the pressure control pipe group; the discharge valve is used for opening and closing according to the pressure value in the pressure control pipe group, so that the storage tank is communicated or blocked with the outside, and the pressure in the pressure control pipe group is limited within a conveying pressure interval value;
the distribution mechanism comprises a distribution pipe group communicated with the downstream user and the storage tank and a distribution pipeline safety valve arranged on the distribution pipe group, the distribution pipeline safety valve is used for discharging and relieving pressure of the distribution pipe group when the distribution pipe safety valve is opened, and the opening pressure of the distribution pipeline safety valve is larger than the maximum value of the conveying pressure interval value.
2. The liquid nitrogen storage tank and nitrogen dispensing line pressure control system of claim 1, wherein said tank pressure control mechanism further comprises a pressure switch for sensing the pressure in said pressure control line set, said pressure switch being in signal communication with said bleed valve control.
3. The liquid nitrogen storage tank and nitrogen dispensing line pressure control system of claim 1, said tank pressure control mechanism further comprising a first isolation valve and a second isolation valve disposed on said pressure control tubing set, said drain valve being located between said first isolation valve and said second isolation valve.
4. A liquid nitrogen storage tank and nitrogen distribution piping pressure control system as claimed in any one of claims 1 to 3, wherein said tank pressure control mechanism further comprises a normally closed bypass valve disposed in parallel with said relief valve, said normally closed bypass valve being adapted to vent and vent said storage tank to the environment when opened.
5. The system as claimed in claim 1, wherein said tank pressure control means further comprises a self-pressurization pipe connected to said storage tank at both ends thereof, and a self-pressurization unit provided on said self-pressurization pipe;
the self-pressurization device is used for guiding liquid nitrogen led out from the bottom of the storage tank through the self-pressurization pipeline to perform gasification pressurization, the pressurized nitrogen flows back to the storage tank through the self-pressurization pipeline, and the pressure control pipe group is connected with the self-pressurization pipeline and is used for guiding the pressurized nitrogen.
6. The system as claimed in claim 5, wherein said tank pressure control mechanism further comprises a pressure regulating valve disposed on said self-pressurization pipe, said pressure regulating valve opens said self-pressurization pipe for pressurization when opened, and said pressure regulating valve closes and shuts off said self-pressurization pipe for stopping pressurization when closed.
7. The liquid nitrogen storage tank and nitrogen dispensing pipeline pressure control system of claim 1, wherein said dispensing mechanism further comprises a liquid nitrogen vaporizer disposed on said dispensing tube bank, said liquid nitrogen vaporizer being connected to vaporize liquid nitrogen derived from said storage tank via said dispensing tube bank, nitrogen being delivered to downstream customers via said dispensing tube bank.
8. The liquid nitrogen storage tank and nitrogen distribution piping pressure control system of claim 1, further comprising a tank protection mechanism;
the tank body protection mechanism comprises a protection safety valve arranged on the tank body and a rupture disc arranged on the tank body; the protection safety valve is used for opening when the pressure in the storage tank reaches a first protection pressure of the tank body so as to discharge the storage tank in a pressure relief mode, and the rupture disc is used for breaking when the pressure in the storage tank reaches a second protection pressure of the tank body so as to discharge the storage tank in a pressure relief mode.
9. The liquid nitrogen storage tank and nitrogen distribution piping pressure control system of claim 8, wherein said tank protection mechanism further comprises a normally closed drain valve in communication with said storage tank, said normally closed drain valve for draining said storage tank when open.
10. A method for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline, characterized in that a system for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline according to any one of claims 1 to 8 is used; the pressure control method of the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
s1, guiding nitrogen in a storage tank to a pressure control pipe group and a distribution pipe group respectively;
s2, detecting the pressure in the pressure control pipe group, and controlling a relief valve to open when the pressure in the pressure control pipe group exceeds the maximum value of a conveying pressure interval value, so that nitrogen in the storage tank is led out through the pressure control pipe group;
when the pressure in the pressure control pipe group is smaller than the minimum value of the conveying pressure interval value, controlling the discharge valve to be closed so as to block the nitrogen discharge of the storage tank;
s3, when the pressure in the distribution pipe group meets the opening pressure of the distribution pipeline safety valve, the distribution pipeline safety valve is opened to discharge and release the pressure of the distribution pipe group; wherein the opening pressure of the delivery line relief valve is configured to be greater than the maximum value of the delivery pressure interval value.
11. The method as claimed in claim 10, wherein the step S2 is performed by detecting a pressure in the pressure control line group through a pressure switch.
12. The method according to claim 10, wherein in step S2, if said relief valve is stuck, said storage tank is vented by opening a normally closed bypass valve.
CN202211026053.1A 2022-08-25 2022-08-25 System and method for controlling pressure of liquid nitrogen storage tank and nitrogen distribution pipeline Active CN115405854B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118009216A (en) * 2024-01-15 2024-05-10 广州广钢气体能源股份有限公司 Subcritical carbon dioxide pressure regulating system and supply system

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047537A (en) * 2012-12-19 2013-04-17 湖北三江航天红阳机电有限公司 LNG (Liquefied Natural Gas) explosion-proof gas supply control system of yacht
CN203052202U (en) * 2013-01-30 2013-07-10 廊坊黎明气体有限公司 Continuous nitrogen supply device
CN104033726A (en) * 2014-07-03 2014-09-10 深圳城市节能环保科技有限公司 Self-pressurization automatic control LNG skid-mounted station
CN203892867U (en) * 2014-06-17 2014-10-22 山西沁水新奥燃气有限公司 Low-temperature liquid storage and supply system with low-temperature gas phase recycling function
CN205208141U (en) * 2015-12-15 2016-05-04 上海加力气体有限公司 Liquid storage -tank pressure control system
CN105650474A (en) * 2016-01-07 2016-06-08 北京航天发射技术研究所 Liquid nitrogen conveying pipeline capable of preventing water attacks
CN205938521U (en) * 2016-08-09 2017-02-08 中石化宁波工程有限公司 Supply nitrogen system in succession
CN206386680U (en) * 2016-12-13 2017-08-08 中能鼎益（天津）新能源科技有限公司 From the LNG fluid reservoir control pressure systems of supercharging
CN107489882A (en) * 2017-10-13 2017-12-19 钦州学院 A kind of LNG tank cars unload hydraulic coupling security system
CN108916647A (en) * 2018-06-25 2018-11-30 杭州新亚低温科技有限公司 A kind of cryogenic liquid is converted into the carburetion system of high pressure gas
CN109915731A (en) * 2019-04-02 2019-06-21 中国石油工程建设有限公司 A kind of big drop lpg pipeline pressure protective system and method
CN209084398U (en) * 2018-10-19 2019-07-09 浙江海天气体有限公司 The device of high pure nitrogen is recycled in a kind of liquid nitrogen tank
CN212359971U (en) * 2020-05-20 2021-01-15 上汽依维柯红岩商用车有限公司 Heavy LNG gas cylinder's for card from turbocharging system
CN215929209U (en) * 2021-08-02 2022-03-01 潮州市潮安区深能燃气有限公司 Saving type liquid nitrogen storage tank
CN114370601A (en) * 2021-12-17 2022-04-19 华能核能技术研究院有限公司 Liquid nitrogen injection system and method and application
CN114877251A (en) * 2022-06-09 2022-08-09 江苏国富氢能技术装备股份有限公司 Liquid hydrogen fuel tank pipeline system for liquid hydrogen ship
CN217235278U (en) * 2022-04-28 2022-08-19 未势能源科技有限公司 Non-contact type heat transfer and pressurization vehicle-mounted gas supply system and vehicle

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047537A (en) * 2012-12-19 2013-04-17 湖北三江航天红阳机电有限公司 LNG (Liquefied Natural Gas) explosion-proof gas supply control system of yacht
CN203052202U (en) * 2013-01-30 2013-07-10 廊坊黎明气体有限公司 Continuous nitrogen supply device
CN203892867U (en) * 2014-06-17 2014-10-22 山西沁水新奥燃气有限公司 Low-temperature liquid storage and supply system with low-temperature gas phase recycling function
CN104033726A (en) * 2014-07-03 2014-09-10 深圳城市节能环保科技有限公司 Self-pressurization automatic control LNG skid-mounted station
CN205208141U (en) * 2015-12-15 2016-05-04 上海加力气体有限公司 Liquid storage -tank pressure control system
CN105650474A (en) * 2016-01-07 2016-06-08 北京航天发射技术研究所 Liquid nitrogen conveying pipeline capable of preventing water attacks
CN205938521U (en) * 2016-08-09 2017-02-08 中石化宁波工程有限公司 Supply nitrogen system in succession
CN206386680U (en) * 2016-12-13 2017-08-08 中能鼎益（天津）新能源科技有限公司 From the LNG fluid reservoir control pressure systems of supercharging
CN107489882A (en) * 2017-10-13 2017-12-19 钦州学院 A kind of LNG tank cars unload hydraulic coupling security system
CN108916647A (en) * 2018-06-25 2018-11-30 杭州新亚低温科技有限公司 A kind of cryogenic liquid is converted into the carburetion system of high pressure gas
CN209084398U (en) * 2018-10-19 2019-07-09 浙江海天气体有限公司 The device of high pure nitrogen is recycled in a kind of liquid nitrogen tank
CN109915731A (en) * 2019-04-02 2019-06-21 中国石油工程建设有限公司 A kind of big drop lpg pipeline pressure protective system and method
CN212359971U (en) * 2020-05-20 2021-01-15 上汽依维柯红岩商用车有限公司 Heavy LNG gas cylinder's for card from turbocharging system
CN215929209U (en) * 2021-08-02 2022-03-01 潮州市潮安区深能燃气有限公司 Saving type liquid nitrogen storage tank
CN114370601A (en) * 2021-12-17 2022-04-19 华能核能技术研究院有限公司 Liquid nitrogen injection system and method and application
CN217235278U (en) * 2022-04-28 2022-08-19 未势能源科技有限公司 Non-contact type heat transfer and pressurization vehicle-mounted gas supply system and vehicle
CN114877251A (en) * 2022-06-09 2022-08-09 江苏国富氢能技术装备股份有限公司 Liquid hydrogen fuel tank pipeline system for liquid hydrogen ship

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118009216A (en) * 2024-01-15 2024-05-10 广州广钢气体能源股份有限公司 Subcritical carbon dioxide pressure regulating system and supply system
CN118009216B (en) * 2024-01-15 2024-08-09 广州广钢气体能源股份有限公司 Subcritical carbon dioxide supply system for chip cleaning

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