CN115405854B - System and method for controlling pressure of liquid nitrogen storage tank and nitrogen distribution pipeline - Google Patents

System and method for controlling pressure of liquid nitrogen storage tank and nitrogen distribution pipeline Download PDF

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Publication number
CN115405854B
CN115405854B CN202211026053.1A CN202211026053A CN115405854B CN 115405854 B CN115405854 B CN 115405854B CN 202211026053 A CN202211026053 A CN 202211026053A CN 115405854 B CN115405854 B CN 115405854B
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China
Prior art keywords
pressure
storage tank
nitrogen
pressure control
tank
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CN202211026053.1A
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Chinese (zh)
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CN115405854A (en
Inventor
唐玉宝
延宗昳
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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
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Classifications

    • 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 liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system and a method thereof, 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 nitrogen is independently supplied to a downstream user through a nitrogen distribution mechanism; therefore, the problem that the safety valve of the delivery pipeline is blocked due to repeated triggering and opening is avoided, the nitrogen use risk of a downstream user is reduced, and the nitrogen use safety is effectively improved.

Description

System and method for controlling pressure of 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 by the nitrogen storage tank, generally, liquid nitrogen is contained in the nitrogen storage tank, and the liquid nitrogen is further transmitted after the volume expansion so as to improve the storage convenience of the nitrogen and reduce the supplementing frequency of the nitrogen; however, the liquid nitrogen in the nitrogen storage tank has a very large temperature difference with the outside, so that the conditions of temperature rise and pressure increase exist more or less, the pressure in the nitrogen distribution pipeline is increased, and the nitrogen use risk of the downstream nitrogen terminal on the nitrogen distribution pipeline is increased;
in view of this, a liquid nitrogen storage tank and a nitrogen distribution piping system as shown in fig. 1 are used in the related art, but the liquid nitrogen storage tank and the nitrogen distribution piping system encounter the following technical problems in use:
When the pressure in the storage tank reaches 1.4MPa, the excess gas nitrogen is transmitted to each downstream user 20, so that the pressure of the storage tank is balanced to avoid the excessively high 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 this time, the downstream safety valve 50 is set to be lower because the excessively high nitrogen pressure at the user end is only required to be avoided, and the storage tank safety valve 60 is set to be higher because the design and use requirements are met, so that the safety valve of the storage tank is always not up to the opening pressure, and the safety valve at the downstream user end is repeatedly triggered to be opened;
Thus, when the downstream safety valve fails to be normally opened and the nitrogen pressure in the pipeline is insufficient to drive the safety valve of the storage tank to be opened, the nitrogen pressure in the pipeline gradually rises to the opening pressure of the safety valve of the storage tank, and under the pressure condition, the downstream nitrogen-using user side bears 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 for solving the technical problems is as follows:
The application provides a liquid nitrogen storage tank and a 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 convey nitrogen to downstream users;
The tank 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 relief valve is used for opening and closing according to the pressure value in the pressure control tube group, so that the storage tank is communicated or blocked with the outside, and the pressure in the pressure control tube group is limited in a conveying pressure interval value;
The delivery mechanism comprises a delivery pipe group communicated with the downstream user and the storage tank, and a delivery pipeline safety valve arranged on the delivery pipe group, wherein the delivery pipeline safety valve is used for discharging and releasing pressure of the delivery pipe group when being opened, and the opening pressure of the delivery 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 the pressure in the pressure control tube set, the pressure switch being in signal connection with the relief 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 tube bank, 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, wherein the normally closed bypass valve is used for discharging and relieving pressure of the storage tank communicated with the outside when the normally closed bypass valve is opened.
In some embodiments, the tank pressure control mechanism further comprises a self-pressurization pipeline with both ends communicated with the storage tank, and a self-pressurizer arranged on the self-pressurization pipeline;
The self-pressurizing device is used for guiding liquid nitrogen guided out from the bottom of the storage tank through the self-pressurizing pipeline to conduct gasification pressurizing, pressurized nitrogen flows back to the storage tank through the self-pressurizing pipeline, and the pressure control pipe group is communicated with the self-pressurizing pipeline and 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 to pressurize when being opened, and cuts off the self-pressurization pipeline to stop pressurizing when the pressure regulating valve is closed.
In some embodiments, the delivery mechanism further comprises a liquid nitrogen vaporizer disposed on the delivery tube set that directs liquid nitrogen directed from the storage tank via the delivery tube set to vaporize, the nitrogen being delivered to a downstream user via the delivery tube set.
In some embodiments, the nitrogen delivery line 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 disk arranged on the tank body; the protection relief valve is used for opening when the pressure in the storage tank reaches the first protection pressure of the tank body so as to release the pressure of the storage tank and discharging, and the rupture disk is used for breaking when the pressure in the storage tank reaches the second protection pressure of the tank body so as to release the pressure of the storage tank and discharging.
In some embodiments, the tank protection mechanism further comprises a normally closed drain valve in communication with the storage tank for venting and depressurizing the storage tank when opened.
On the other hand, the invention also provides an improved liquid nitrogen storage tank and nitrogen distribution pipeline pressure control method, and the nitrogen distribution pipeline pressure control method adopts the liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system according to any one of the technical schemes; the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
S1, respectively guiding nitrogen in a storage tank to a pressure control pipe group and a distribution pipe group;
S2, detecting the pressure in the pressure control pipe group, and controlling a relief valve to be opened 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 tube group is smaller than the minimum value of the conveying pressure interval value, the relief valve is controlled to be closed, so that the nitrogen discharge of the storage tank is blocked;
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 relieve pressure on the distribution pipe group; wherein the opening pressure of the delivery line safety valve is configured to be greater than the maximum value of the delivery pressure interval value.
In some embodiments, in said step S2, the pressure within said pressure control tube set is detected by a pressure switch.
In some embodiments, in the step S2, if the relief valve is stuck, the 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 at least the following beneficial effects:
The invention relates to a liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system and a method thereof, 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 downstream users are independently supplied with nitrogen through a distribution mechanism; therefore, the problem that the safety valve of the delivery pipeline is blocked due to repeated triggering and opening is avoided, the nitrogen use risk of a downstream user is reduced, and the nitrogen use safety is effectively improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a related art liquid nitrogen storage tank and nitrogen distribution piping system;
FIG. 2 is a schematic diagram of a liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system in accordance with a preferred embodiment of the present invention;
FIG. 3 is an enlarged view of the liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system of FIG. 2 at A;
FIG. 4 is an enlarged view of the liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system of FIG. 2 at B;
FIG. 5 is a flow chart of a method of controlling the pressure of a liquid nitrogen storage tank and nitrogen distribution pipeline in a preferred embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 2 illustrates a liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system 10 for delivering nitrogen from the storage tank to a downstream user and for regulating and controlling the nitrogen pressure during delivery in accordance with some preferred embodiments of the present invention.
As shown in fig. 2-4, the liquid nitrogen storage tank and nitrogen delivery line pressure control system 10 includes a tank pressure control mechanism 2 in communication with the storage tank 1 to control the pressure within the tank and a delivery mechanism 3 in communication with the storage tank 1 to deliver nitrogen to a downstream user 5.
The storage tank 1 is used for containing nitrogen, including liquid nitrogen and gaseous nitrogen; the pressure in the tank needs to be kept in a certain pressure interval, and the pressure interval is specifically adjusted according to design and use requirements. The tank pressure control means 2 is for adjusting the tank internal pressure of the tank 1 to a predetermined pressure range. The delivery mechanism 3 is used to deliver nitrogen from the storage tank 1 to the downstream consumer 5. Downstream user 5 refers broadly to areas, equipment, devices, facilities, sites, 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 of the tank pressure control mechanism 2 will not be transmitted to the downstream user 5, but directly discharged to the outside, so as to avoid excessively increasing the nitrogen pressure at the dispensing mechanism 3 and the downstream user 5.
The tank pressure control mechanism 2 includes a pressure control pipe group 21 communicating with the tank 1, and a relief valve 22 provided on the pressure control pipe group 21; the relief valve 22 is used for opening and closing according to the pressure value in the pressure control tube group 21, so as to communicate or block the storage tank 1 with the outside, and further limit the pressure in the pressure control tube group 21 within the delivery pressure interval value.
It will be appreciated that the pressure control tube set 21 is used to take in nitrogen from the tank 1 and to guide it along a predetermined trajectory, and that the relief valve 22 is used to open or block the pressure control tube set 21.
It is also understood that a pressure sensor commonly used in the related art may be used to obtain the nitrogen pressure value in the pressure control tube group 21, then the nitrogen pressure value is compared with the two end values of the preset delivery pressure interval value, and then the relief valve 22 is controlled to be opened or closed 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 tube group 21 is blocked, and the communication between the storage tank 1 and the outside is cut off; of course, other components in the prior art may be used to detect the nitrogen pressure in the pressure control tube set 21, and the nitrogen pressure detecting element may be directly integrated on the relief valve 22; the pressure detection method and the specific installation position of the pressure control tube group 21 are not limited to those described above, and the nitrogen pressure flowing to the relief valve 22 may be detected.
It should be noted that, the pressure control tube group 21 may be configured by splicing a plurality of tubes, or may be composed of only one tube, and may be flexibly set depending on the installation site. The pressure interval value of the relief valve 22, namely the pressure value required by the pressure control tube group 21, when the pressure interval value is too low, the relief valve 22 is closed, and the self-pressurization structure of the liquid nitrogen storage tank and the nitrogen distribution pipeline pressure control system 10 is used for self-pressurization, specifically, the liquid nitrogen is led out and gasified and then flows back into the storage tank 1, so that 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 tube 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 delivery pressure interval value, and the maximum pressure value and the minimum pressure value are respectively two end values of the delivery pressure interval value.
The lowest pressure of the storage tank 1 is set to ensure the lowest pressure of the nitrogen to be delivered to the delivery mechanism 3, and the nitrogen delivered under the lowest pressure is gasified and then further delivered to a downstream user, so that the lowest pressure of the nitrogen to be used by the downstream user can be met; and after the nitrogen conveyed by the highest pressure is gasified, the nitrogen pressure of the downstream user can be prevented from being too high, and the nitrogen use safety of the downstream user is ensured.
The dispensing mechanism 3 includes a dispensing tube group 31 for communicating a downstream user with the tank 1, and a dispensing relief valve 32 provided on the dispensing tube group 31, the dispensing relief valve 32 being for discharging and releasing pressure of the dispensing tube group 31 when opened, the opening pressure of the dispensing relief valve 32 being greater than the maximum value of the delivery pressure interval value.
As can be appreciated, the delivery tube set 31 is used to direct nitrogen delivery to downstream users; the dispensing safety valve 32 is used to define the maximum pressure of the dispensing tube group 31, avoiding the pressure of the dispensing tube group 31 from becoming too high.
It should be noted that, the dispensing tube group 31 may be configured by splicing a plurality of tubes, or may be composed of only one tube, and may be flexibly set depending on the installation site and the number of users downstream, and of course, the dispensing tube group 31 may include a delivery joint, a control device, and the like in addition to the tubes.
In addition to the above, it should be noted that, since the tank 1 is respectively connected to the pressure control tube group 21 and the distribution tube group 31, the pressure of the tank 1 is equal to the pressure in the pressure control tube group 21, and the pressure of the tank 1 is equal to the pressure in the portion of the distribution tube group 31 before the vaporization of the liquid nitrogen, that is, the pressure in the pipe of the distribution tube group 31 for guiding the liquid nitrogen from the tank 1 to the liquid nitrogen vaporizing element is equal to the pressure of the tank 1.
In summary, in the practical application process, when the pressure in the storage tank 1 does not meet the minimum nitrogen pressure requirement, 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 of gasifying liquid nitrogen and refluxing the storage tank 1, and at this time, the relief valve 22 is kept closed; when the pressure in the storage tank 1 reaches the highest nitrogen pressure, namely when the pressure of the storage tank 1 reaches the maximum value of the transmission pressure interval value, the storage tank 1 stops self-pressurization; then, if the pressure in the storage tank 1 continues to rise and exceeds the maximum value of the delivery pressure interval value, the relief valve 22 is opened, nitrogen in the storage tank 1 is directly discharged to the outside through the pressure control pipe group 21 for pressure relief, and when the pressure in the pressure control pipe group 21 is reduced to be less than or equal to the minimum value of the delivery pressure interval value, the relief valve 22 is closed, pressure relief is stopped, and the storage tank 1 continues to be self-pressurized; in this way, under the cyclic reciprocation, the pressure in the pressure control tube group 21 is always controlled within the pressure range of the conveying pressure interval value, that is, the pressure in the pipeline before the storage tank 1 is conveyed to the delivery tube group 31 is always controlled within the pressure range of the conveying pressure interval value, so that the nitrogen pressure before the gasification for conveying to the downstream user is controlled within the pressure range of the conveying pressure interval value, and further, the pressure after the gasification of the liquid nitrogen is always controlled within the nitrogen pressure requirement range of the downstream user; thus, the downstream user's regulation of the nitrogen pressure is mainly regulated by the relief valve 22;
On the basis of the above, the opening pressure of the delivery pipeline safety valve 32 is configured to be greater than the maximum value of the nitrogen pressure requirement range of the downstream user, and the opening pressure of the delivery pipeline safety valve 32 is combined with the maximum value of the conveying pressure interval value for driving the relief valve 22 to open, so that in the actual use process, the relief valve 22 will be opened and decompressed prior to the delivery pipeline safety valve 32, the nitrogen pressure of the downstream user is reduced, compared with the mode of adjusting the safety valve on the side of the downstream user in a too dependent manner 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, in some embodiments, a pressure switch 23 for sensing the pressure in the pressure control tube set 21, and the pressure switch 23 is in control signal connection with the relief valve 22.
It is understood that the control signal connection is an electrical connection, in particular, both are connected by, for example, a voltage signal or other signal. The pressure switch 23 and the relief valve 22 are in linkage relation, and the relief valve 22 is controlled to be opened and closed according to the pressure value in the induction pressure control tube group 21 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 provided on the pressure control tube set 21, and the relief valve 22 is located between the first isolation valve 24 and the second isolation valve 25.
It will be appreciated that the first isolation valve 24 and the 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 flow out of the bleed valve 22 for venting. The two stop valves can realize the isolation of pipeline areas with different degrees, and are convenient for maintenance, pipeline change and the like.
As shown in fig. 2 and 3, the tank pressure control mechanism 2 in some embodiments further includes a normally closed bypass valve 26 disposed in parallel with the relief valve 22, the normally closed bypass valve 26 being configured to vent the tank 1 to the outside when opened.
It will be appreciated that normally closed bypass valve 26 is normally blocked under normal use conditions and that nitrogen to bleed valve 22 cannot be directly vented through the bypass in which normally closed bypass valve 26 is located. For example, when the relief valve 22 fails to be closed and cannot be opened, the normally closed bypass valve 26 is opened to realize the override of the branch where the relief valve 22 is located, and the nitrogen in the pressure control tube group 21 is directly discharged to the outside through the branch where the normally closed bypass valve 26 in the opened state is located, so that the override relief valve 22 is subjected to pressure relief and discharge.
As shown in fig. 2 and 4, the tank pressure control mechanism 2 further includes a self-pressurizing pipe 27 having both ends communicating with the tank 1, and a self-pressurizing unit 28 provided on the self-pressurizing pipe 27 in some embodiments. The self-pressurizing device 28 is used for introducing liquid nitrogen led out from the bottom of the storage tank 1 through the self-pressurizing pipeline 27 to gasify and pressurize, 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 introducing the pressurized nitrogen.
It will be appreciated that the self-pressurizing conduit 27 may be configured to be connected by one or more conduits, with flexible adjustment depending on the design and application requirements of the product. The self-booster 28 may be a component or structure capable of exchanging heat between liquid nitrogen and the outside in the related art.
The self-pressurization pipeline 27 guides out liquid nitrogen from the bottom of the storage tank 1 and then conveys the liquid nitrogen to the self-booster 28 for gasification pressurization, specifically, the liquid nitrogen exchanges heat with the outside on the self-booster 28, the liquid nitrogen with rising heat of the liquid nitrogen is gasified and expanded into a gas state, and the gas nitrogen with higher pressure can flow back to the storage tank 1 to enable the pressure of the storage tank 1 to rise, so that the self-pressurization is realized.
It should be further noted that the connection between the pressure control tube set 21 and the self-pressurizing conduit 27 is preferably arranged downstream of the self-pressurizing 28, i.e. the relief valve 22 is mainly used for regulating the pressure of the vaporized gaseous nitrogen, and in general, the direct discharge of the overpressure of liquid nitrogen has a relatively high risk factor. The relief valve 22 is opened to discharge the gasified gaseous nitrogen and the gaseous nitrogen at the top of the storage tank 1, and the overall pressure is controlled.
As shown in fig. 4, the tank pressure control mechanism 2 further includes a pressure regulating valve 29 provided in the self-pressurizing pipe 27 in some embodiments, and opens the self-pressurizing pipe 27 to pressurize when the pressure regulating valve 29 is opened, and cuts off the self-pressurizing pipe 27 to stop pressurizing when the pressure regulating valve 29 is closed.
It will be appreciated that the pressure regulating valve 29 may be an electrically controlled valve or a mechanically controlled valve, when the pressure in the tank 1 is lower than the minimum pressure required for transmission, the pressure regulating valve 29 is opened, the self-pressurizing pipe 27 is opened, and nitrogen in the tank 1 can be gasified and pressurized along the self-pressurizing pipe 27 and returned to the tank 1 to complete self-pressurization.
As shown in fig. 2, the dispensing mechanism 3 in some embodiments further comprises a liquid nitrogen vaporizer 33 disposed on the dispensing tube set 31, the liquid nitrogen vaporizer 33 receiving liquid nitrogen from the storage tank 1 via the dispensing tube set 31 for vaporization, the nitrogen being delivered to a downstream user via the dispensing tube set 31.
It will be appreciated that the liquid nitrogen vaporizer 33 is configured to vaporize liquid nitrogen, which absorbs heat as it flows through the liquid nitrogen vaporizer 33. The gaseous nitrogen formed after gasification by the liquid nitrogen gasifier 33 is increased in pressure and is further supplied to downstream users.
As shown in fig. 2 and 3, the nitrogen delivery line pressure control system 10 in some embodiments further includes 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 relief valve 41 is used to open to let out pressure in the tank 1 when the pressure in the tank 1 reaches the tank first protection pressure, and the rupture disc 42 is used to rupture to let out pressure in the tank 1 when the pressure in the tank 1 reaches the tank second protection pressure.
It will be appreciated that the protection safety valves 41 may be directly disposed on the storage tank 1, or may be communicated with the storage tank 1 through a pipeline, the number of the protection safety valves 41 may be one or more, and the arrangement of a plurality of protection safety valves 41 may ensure that the pressure relief protection is completed when part of the protection safety valves 41 fail. The rupture disk 42 is directly blasted to form a gap when exceeding the rated pressure, so as to form a normally open channel for nitrogen to be discharged, and the pressure of the storage tank 1 is continuously relieved and discharged, and the number of the rupture disks 42 can be set to be multiple as well.
The rupture pressure of the rupture disk 42 is larger than the opening pressure of the protection relief valve 41, and the tank 1 is preferably discharged by the protection relief valve 41. The opening pressures of the plurality of protection safety valves 41 may be the same or different, and are configured so as not to be capable of performing staged pressure relief discharge on the pressure in the storage tank 1 at the same time; the burst pressure of the plurality of rupture discs 42 may 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 tank 1, the normally closed drain valve 43 being adapted to drain and depressurize the tank 1 when opened.
It will be appreciated that when the normally closed drain valve 43 is open, the tank 1 can be vented directly without passing through any valve body.
FIG. 5 illustrates a liquid nitrogen storage tank and nitrogen distribution line pressure control method in accordance with certain preferred embodiments of the present invention employing the liquid nitrogen storage tank and nitrogen distribution line pressure control system 10 illustrated in FIGS. 2-4 to control the distribution pressure of nitrogen;
the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
s1, respectively guiding nitrogen in the storage tank 1 to the pressure control tube group 21 and the distribution tube group 31;
It will be appreciated that the pressure control tube bank 21 and the dispensing tube bank 31 are in communication with the storage tank 1, respectively, so that nitrogen within the storage 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 group 21 and the dispensing tube group 31 are not directly connected to each other, and nitrogen discharged from pressure relief of either one of them does not flow into the other, that is, the pressure relief discharge of one of them does not cause the pressure of the other to rise.
S2, detecting the pressure in the pressure control tube group 21, and controlling the relief valve 22 to be opened when the pressure in the pressure control tube 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 tube group 21;
When the pressure in the pressure control tube group 21 is smaller than the minimum value of the delivery pressure interval value, the control relief valve 22 is closed, thereby blocking the nitrogen discharge of the tank 1;
It will be appreciated 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 one of which is the interval minimum value.
If the pressure value of the pressure control tube group 21 is larger than the maximum value of the delivery 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 tube group 21 is smaller than the minimum value of the delivery pressure interval value, the control relief valve 22 is closed, and relief of pressure is stopped.
It should be noted that, once the pressure value of the pressure control tube group 21 satisfies the opening condition of the relief valve 22, the relief valve 22 may be opened, and the relief valve 22 needs to be re-closed once the pressure value of the pressure control tube group 21 is reduced to the minimum value of the delivery pressure interval value. And relief valve 22, once closed, needs to be opened when the pressure value of pressure control tube set 21 exceeds the maximum value of the delivery pressure interval value; in this way, the pressure of the pressure control tube group 21 is always controlled within the delivery pressure zone value range;
In this way, under the condition that the nitrogen delivery pressure is stable, the nitrogen delivery pressure of the nitrogen which is gasified under the pressure and then delivered to a downstream user is stable, and particularly, the pressure before expansion is limited because the expansion ratio of the liquid nitrogen is stable, and the pressure after expansion is also stable;
S3, when the pressure in the dispensing tube group 31 meets the opening pressure of the dispensing tube safety valve 32, the dispensing tube safety valve 32 is opened to discharge and release the dispensing tube group 31; wherein the opening pressure of the delivery line safety valve 32 is configured to be greater than the maximum value of the delivery pressure interval value.
It will be appreciated that the pressure within dispensing tube set 31, i.e., the pressure of the downstream user with nitrogen, is specifically the pressure at which vaporized nitrogen builds up within dispensing tube set 31. Normally, the distribution line safety valve 32 does not operate because the internal pressure before vaporization in the distribution tube group 31 is equal to the internal pressure of the storage tank 1, and the internal pressure of the storage tank 1 is regulated depending on the relief valve 22 so that the nitrogen pressure supplied to the upstream end of the liquid nitrogen vaporizer 33 via the storage tank 1 is kept within a certain range, and if the pressure of the storage tank 1 increases, the nitrogen pressure of the storage tank 1 is preferably regulated by the relief valve 22, that is, the nitrogen pressure before being supplied to the liquid nitrogen vaporizer 33 is preferably regulated, and the regulation is not dependent on the distribution line safety valve 32 located after the liquid nitrogen vaporizer 33. Avoiding the blockage of the dispensing line safety valve 32 by repeated frequent opening effectively reduces the risk of nitrogen use for downstream users.
Specifically, in some embodiments of step S2, the pressure within the pressure control tube set 21 is detected by the pressure switch 23.
It will be appreciated that the position of the pressure switch 23 is very flexible, as long as the pressure at the position where it is set directly corresponds to the nitrogen pressure of the relief valve 22. Secondly, a control element can be additionally arranged to receive the 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 also be achieved by other electrical structures.
In some embodiments of step S2, if the bleed valve 22 is stuck, the tank 1 is vented by opening the 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 vent nitrogen from the tank 1 directly to the outside.
The system and the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline have at least the following beneficial effects:
The invention relates to a liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system and a method thereof, 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 downstream users are independently supplied with nitrogen through a distribution mechanism; therefore, the problem that the safety valve of the delivery pipeline is blocked due to repeated triggering and opening is avoided, the nitrogen use risk of a downstream user is reduced, and the nitrogen use safety is effectively improved.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.

Claims (12)

1. The 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 delivery mechanism communicated with the storage tank to deliver nitrogen to a downstream user;
The tank 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 relief valve is used for opening and closing according to the pressure value in the pressure control tube group, so that the storage tank is communicated or blocked with the outside, and the pressure in the pressure control tube group is limited in a conveying pressure interval value;
The delivery mechanism comprises a delivery pipe group communicated with the downstream user and the storage tank, and a delivery pipeline safety valve arranged on the delivery pipe group, wherein the delivery pipeline safety valve is used for discharging and releasing pressure of the delivery pipe group when being opened, and the opening pressure of the delivery pipeline safety valve is larger than the maximum value of the conveying pressure interval value.
2. The liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system according to claim 1, wherein said tank pressure control mechanism further comprises a pressure switch for sensing the pressure in said pressure control tube set, said pressure switch being in signal connection with said relief valve control signal.
3. The liquid nitrogen storage tank and nitrogen distribution pipeline 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 tube bank, said relief valve being located between said first isolation valve and said second isolation valve.
4. A liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system according to 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 for venting and venting said storage tank to the outside when open.
5. The liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system according to claim 1, wherein the tank pressure control mechanism further comprises a self-pressurization pipeline with both ends communicated with the storage tank and a self-pressurizer arranged on the self-pressurization pipeline;
The self-pressurizing device is used for guiding liquid nitrogen guided out from the bottom of the storage tank through the self-pressurizing pipeline to conduct gasification pressurizing, pressurized nitrogen flows back to the storage tank through the self-pressurizing pipeline, and the pressure control pipe group is connected with the self-pressurizing pipeline and used for guiding the pressurized nitrogen.
6. The system according to claim 5, wherein the tank pressure control means further comprises a pressure regulating valve provided to the self-pressurizing pipe, wherein the pressure regulating valve opens the self-pressurizing pipe to pressurize the liquid nitrogen tank and the nitrogen distribution pipe, and closes the pressure regulating valve to stop pressurizing the liquid nitrogen tank and the nitrogen distribution pipe.
7. The liquid nitrogen storage tank and nitrogen delivery conduit pressure control system of claim 1, wherein said delivery mechanism further comprises a liquid nitrogen vaporizer disposed on said delivery tube set, said liquid nitrogen vaporizer receiving liquid nitrogen directed from said storage tank via said delivery tube set for vaporization, nitrogen being delivered to a downstream user via said delivery tube set.
8. The liquid nitrogen storage tank and nitrogen delivery line 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 disk arranged on the tank body; the protection relief valve is used for opening when the pressure in the storage tank reaches the first protection pressure of the tank body so as to release the pressure of the storage tank and discharging, and the rupture disk is used for breaking when the pressure in the storage tank reaches the second protection pressure of the tank body so as to release the pressure of the storage tank and discharging.
9. The liquid nitrogen storage tank and nitrogen distribution pipeline pressure control system of claim 8, wherein said tank protection mechanism further comprises a normally closed drain valve in communication with said storage tank for venting and venting said storage tank when opened.
10. A method for controlling the pressure of a liquid nitrogen storage tank and a nitrogen distribution pipeline, characterized in that the liquid nitrogen storage tank and the nitrogen distribution pipeline pressure control system according to any one of claims 1 to 8 are adopted; the method for controlling the pressure of the liquid nitrogen storage tank and the nitrogen distribution pipeline comprises the following steps:
S1, respectively guiding nitrogen in a storage tank to a pressure control pipe group and a distribution pipe group;
S2, detecting the pressure in the pressure control tube group, and controlling a relief valve to be opened when the pressure in the pressure control tube 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 tube group until the pressure value of the pressure control tube group is reduced to the minimum value of the conveying pressure interval value, and controlling the relief valve to be closed again;
When the pressure in the pressure control tube group is smaller than the minimum value of the conveying pressure interval value, the relief valve is controlled to be closed, so that nitrogen discharge of the storage tank is blocked, and the relief valve is controlled to be opened for relief until the pressure value of the pressure control tube group is increased to the maximum value of the conveying pressure interval value;
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 relieve pressure on the distribution pipe group; wherein the opening pressure of the delivery line safety valve is configured to be greater than the maximum value of the delivery pressure interval value.
11. The method according to claim 10, wherein in step S2, the pressure in the pressure control tube group is detected by a pressure switch.
12. The method according to claim 10, wherein in step S2, if the relief valve is stuck, the storage tank is discharged and depressurized 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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