CN116336376A - Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system - Google Patents

Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system Download PDF

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Publication number
CN116336376A
CN116336376A CN202310389826.0A CN202310389826A CN116336376A CN 116336376 A CN116336376 A CN 116336376A CN 202310389826 A CN202310389826 A CN 202310389826A CN 116336376 A CN116336376 A CN 116336376A
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China
Prior art keywords
liquid nitrogen
storage tank
nitrogen storage
pressure
automatic regulating
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Pending
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CN202310389826.0A
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Chinese (zh)
Inventor
高荣
司标
田富竟
洪兴福
牛璐
张伟
葛雨珩
肖楚璠
刘成
黄攀宇
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High Speed Aerodynamics Research Institute of China Aerodynamics Research and Development Center
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High Speed Aerodynamics Research Institute of China Aerodynamics Research and Development Center
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Priority to CN202310389826.0A priority Critical patent/CN116336376A/en
Publication of CN116336376A publication Critical patent/CN116336376A/en
Pending legal-status Critical Current

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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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • 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
    • 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
    • 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
    • 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
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention belongs to the technical field of low-temperature storage tanks, and discloses a liquid nitrogen storage tank air supplementing system for high-flow instantaneous discharge. The external air supplementing system is always in a working state, the reaction time of the self-pressurizing air supplementing system is not required to wait, the response can be fast, the liquid nitrogen in the vacuum storage tank is gasified and then is filled into the liquid nitrogen storage tank, the tank pressure of the liquid nitrogen storage tank is supplemented, and the regulating time of the pressure in the storage tank can be reduced after the self-pressurizing air supplementing system starts to work; meanwhile, the exhaust system automatically discharges gas after the pressure exceeds a set value, so that the pressure of the storage tank can reach a stable state rapidly. The high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system can ensure that the pressure in the liquid nitrogen storage tank is quickly supplemented and kept constant when the liquid nitrogen storage tank is instantaneously discharged at high flow, prevent negative pressure and overpressure phenomena, and ensure the working stability and the equipment safety of the liquid nitrogen storage tank system.

Description

Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system
Technical Field
The invention belongs to the technical field of low-temperature storage tanks, and particularly relates to a liquid nitrogen storage tank air supplementing system for high-flow instantaneous discharge.
Background
Liquid nitrogen plays an important role in the industrial production and manufacturing process, and along with the development of society, the demand for liquid nitrogen is gradually increased, and meanwhile, the storage of liquid nitrogen promotes the development of low-temperature storage tank technology. Moreover, with the widespread use of high-flow cryogenic pumps, high-flow cryogenic liquid delivery and discharge conditions continue to increase. For a high-capacity low-temperature storage tank, negative pressure in the tank can be caused during high-speed and high-flow discharge, and the stability of work and the safety of equipment are seriously affected.
At present, a set of self-pressurization air supplementing system is arranged on the high-capacity low-temperature storage tank, liquid nitrogen is led out from the bottom and enters a vaporizer, the vaporizer vaporizes the liquid nitrogen and then fills the high-capacity low-temperature storage tank, and the pressure in the tank of the high-capacity low-temperature storage tank is supplemented, so that the pressure regulating function is realized. However, the self-pressurization air supplementing system has certain hysteresis, the reaction time is relatively long, and the actual working requirement of a large-flow instant discharging liquid nitrogen storage tank is difficult to meet.
Currently, there is a need to develop a tank air make-up system for high flow transient discharge liquid nitrogen.
Disclosure of Invention
The invention aims to provide a liquid nitrogen storage tank air supplementing system for high-flow instant discharging, which is used for overcoming the defects of the prior art.
The invention relates to a liquid nitrogen storage tank air supplementing system for high-flow instant discharging, wherein a liquid nitrogen storage tank is provided with a liquid inlet device, the liquid inlet device comprises a manual stop valve V1 and a matched pipeline, the inlet end of the manual stop valve V1 is connected with a fractionating tower cold box, and the outlet end of the manual stop valve V1 is connected with a liquid nitrogen storage tank top port B; the liquid nitrogen storage tank is provided with a liquid discharge device, the liquid discharge device comprises a low-temperature liquid pump and a matched pipeline, the inlet end of the low-temperature liquid pump is connected with a bottom port E of the liquid nitrogen storage tank, and the outlet end of the low-temperature liquid pump is connected with a user; the liquid nitrogen storage tank air supplementing system for the high-flow instant discharge is characterized by comprising a self-pressurization air supplementing system, an external air supplementing system and an exhaust system;
the inlet end of a manual stop valve V4 of the self-pressurization air supplementing system is connected with a top port C of a liquid nitrogen storage tank through a matched pipeline, and the outlet end of the manual stop valve V4 is connected with a pressure transmitter II; the pressure transmitter II transmits a control signal to the automatic regulating valve V6 through a signal wire, the inlet end of the automatic regulating valve V6 is connected with the bottom port F of the liquid nitrogen storage tank through a matched pipeline, the outlet end of the automatic regulating valve V6 is connected with the inlet end of the vaporizer II through a matched pipeline, and the outlet end of the vaporizer II is connected with the top port D of the liquid nitrogen storage tank through a matched pipeline;
the vacuum storage tank of the external air supplementing system stores liquid nitrogen, the inlet end of the vaporizer I is connected with the bottom port of the vacuum storage tank through a matched pipeline, the outlet end of the vaporizer I is connected with the inlet end of the automatic regulating valve V5 through a matched pipeline, the outlet end of the automatic regulating valve V5 is connected with the inlet end of the manual stop valve V2 through a matched pipeline, and the outlet end of the manual stop valve V2 is connected with the top port A of the liquid nitrogen storage tank through a matched pipeline; the inlet end of the manual stop valve V3 is connected with the outlet pipeline of the automatic regulating valve V5 through a matched pipeline, the outlet end of the manual stop valve V3 is connected with a pressure transmitter I through a matched pipeline, and the pressure transmitter I transmits a control signal to the automatic regulating valve V5 through a signal line;
the inlet end of a manual stop valve V4 of the exhaust system is connected with a top port C of a liquid nitrogen storage tank through a matched pipeline, and the outlet end of the manual stop valve V4 is connected with a pressure transmitter II; the pressure transmitter II transmits a control signal to an automatic regulating valve V7 through a signal wire, the inlet end of the automatic regulating valve V7 is connected with a top port G of a liquid nitrogen storage tank through a matched pipeline, and the outlet end of the automatic regulating valve V7 is connected with the atmosphere through a matched pipeline;
during operation, liquid nitrogen in the cold box of the fractionating tower enters the liquid nitrogen storage tank through the manual stop valve V1 and the matched pipeline through the port B of the liquid nitrogen storage tank, and is stored for later use; when the liquid nitrogen storage tank supplies liquid nitrogen to the outside, the low-temperature liquid pump conveys liquid nitrogen to a user through the matched pipeline, and the liquid nitrogen in the liquid nitrogen storage tank is rapidly reduced due to the large working flow of the low-temperature liquid pump, so that the situation of excessively rapid pressure reduction of the liquid nitrogen storage tank occurs; meanwhile, the pressure transmitter I of the external air supplementing system and the pressure transmitter II of the self-pressurization air supplementing system detect that the in-tank pressure of the liquid nitrogen storage tank is too fast to drop and reaches a set value, the pressure transmitter I transmits a control signal to the automatic regulating valve V5, the pressure transmitter II transmits the control signal to the automatic regulating valve V6, and when the pressure transmitter II detects that the in-tank pressure of the liquid nitrogen storage tank is too fast to rise and reaches the set value, the pressure transmitter II transmits the control signal to the automatic regulating valve V7;
for the external air supplementing system, the manual stop valve V2 and the manual stop valve V3 are normally open valves, and the carburetor I is always in a working state; the automatic regulating valve V5 is opened after receiving a control signal from the pressure transmitter I, and nitrogen gasified from the gasifier I rapidly enters the liquid nitrogen storage tank through a matched pipeline, the automatic regulating valve V5, the manual stop valve V2 and the top port A of the liquid nitrogen storage tank for pressure compensation;
for the self-pressurization air supplementing system, an automatic regulating valve V6 is opened after receiving a control signal of a pressure transmitter II, liquid nitrogen in a liquid nitrogen storage tank is vaporized from a bottom port F of the liquid nitrogen storage tank to a vaporizer II through a matched pipeline, and then the liquid nitrogen storage tank is pressurized from a top port D of the liquid nitrogen storage tank through the matched pipeline; because the self-pressurization air-supplementing system needs vaporization time, the liquid nitrogen in the liquid nitrogen storage tank is pressurized after vaporization, and the self-pressurization air-supplementing system and the external air-supplementing system simultaneously pressurized the liquid nitrogen storage tank after the lag time is up, compared with the external air-supplementing system, the regulating time of the pressure stabilization of the liquid nitrogen storage tank is shortened;
for the exhaust system, the automatic regulating valve V7 is opened after receiving the control signal of the pressure transmitter II, and nitrogen in the liquid nitrogen storage tank is discharged into the atmosphere from the top port G of the liquid nitrogen storage tank through the automatic regulating valve V7 by a matched pipeline, so that the pressure in the tank is quickly stabilized.
Further, the carburetor II comprises two evaporators connected in parallel, and the evaporators are switched with each other in operation.
Further, the vaporizer I comprises two parallel vaporizers, and the vaporizers are switched with each other in operation.
Further, the low-temperature liquid pump comprises a plurality of low-temperature liquid pumps which are connected in parallel, and one or a plurality of low-temperature liquid pumps are selected to be started according to the liquid discharge flow when the low-temperature liquid pump works.
Further, a breather valve is arranged at the top of the liquid nitrogen storage tank and is communicated with a top port H of the liquid nitrogen storage tank, when the pressure in the tank of the liquid nitrogen storage tank reaches a set positive warning threshold value, the breather valve exhales, and when the pressure in the tank of the liquid nitrogen storage tank reaches a set negative warning threshold value, the breather valve inhales.
According to the invention, the vaporizer I and the vaporizer II used in the large-flow instant discharging liquid nitrogen storage tank air supplementing system are both arranged into two parallel vaporizer forms, and the two parallel vaporizers are switched to be used in the working process, so that stable heat exchanging effect is maintained.
Compared with a self-pressurization air supplementing system, the external air supplementing system for the large-flow instant discharging liquid nitrogen storage tank air supplementing system has the advantages that liquid nitrogen in a vacuum storage tank is gasified and then is filled into the liquid nitrogen storage tank, the vaporizer of the external air supplementing system is always in a working state, the response time of the vaporizer of the self-pressurization air supplementing system is not required to wait, the tank pressure of the liquid nitrogen storage tank can be quickly responded, the regulating time of the tank pressure can be reduced after the self-pressurization system begins to work, meanwhile, in order to prevent the air supplementing from exceeding the fast storage tank pressure, the air exhausting system automatically discharges the excess pressure according to the storage tank pressure condition, and finally the storage tank pressure is quickly stabilized.
The air supplementing system for the liquid nitrogen storage tank for high-flow instantaneous discharge disclosed by the invention can ensure that the pressure in the liquid nitrogen storage tank is rapidly supplemented and kept constant when the liquid nitrogen storage tank is discharged at high-flow instantaneous through the mutual cooperation of the self-pressurization air supplementing system, the external air supplementing system and the exhaust system, so that the phenomena of negative pressure and overpressure are prevented, and the working stability and the equipment safety of the liquid nitrogen storage tank system are ensured.
Drawings
FIG. 1 is a schematic diagram of the air make-up system for a high flow instant discharging liquid nitrogen storage tank of the present invention.
1. A liquid nitrogen storage tank; 2. a fractionating tower cold box; 3. a cryogenic liquid pump; 4. a pressure transmitter II; 5. a vaporizer II; 6. a vaporizer I; 7. a vacuum storage tank; 8. a pressure transmitter I; 9. a respiratory valve;
V1-V4 are sequence numbers of manual stop valves; v5 and V7 are serial numbers of the automatic regulating valve; v6 is an automatic valve opening and closing symbol;
A. b, C, D, G, H is the top port number of the liquid nitrogen storage tank; E. f is the serial number of the bottom port of the liquid nitrogen storage tank.
Description of the embodiments
The invention is described in detail below with reference to the drawings and examples.
Example 1:
as shown in fig. 1, the outlet end of the manual stop valve V1 of the embodiment is connected with the top port B of the liquid nitrogen storage tank 1 through a matched pipeline, and the liquid nitrogen in the cold box 2 of the fractionating tower enters the liquid nitrogen storage tank 1 for storage through the path; the inlet end of the high-flow cryogenic liquid pump 3 is connected with the bottom port E of the liquid nitrogen storage tank 1 through a matched pipeline, and liquid nitrogen in the liquid nitrogen storage tank 1 is conveyed to a user through the path; the inlet end of the manual stop valve V4 is connected with the top port C of the liquid nitrogen storage tank 1 through a matched pipeline, the outlet end of the manual stop valve V4 is connected with the pressure transmitter II 4 through a matched pipeline, the path is used for detecting the in-tank pressure of the liquid nitrogen storage tank 1 in real time, the pressure transmitter II 4 transmits a control signal to the automatic switching valve V6 through a signal wire to control the opening and closing of the automatic switching valve V6, the inlet end of the automatic switching valve V6 is connected with the bottom port F of the liquid nitrogen storage tank 1 through a matched pipeline, the outlet end of the automatic switching valve V6 is connected with the inlet end of the vaporizer II 5 through a matched pipeline, the outlet end of the vaporizer II 5 is connected with the top port D of the liquid nitrogen storage tank 1 through a matched pipeline, the path is a self-pressurization air supplementing system, the vaporization of liquid nitrogen in the liquid nitrogen storage tank 1 into nitrogen can be realized and returned into the liquid nitrogen storage tank 1, the in-tank pressure of the liquid nitrogen 1 is regulated, and whether the vaporizer II 5 works or not is controlled by the signal of the pressure transmitter II 4; the pressure transmitter II 4 also transmits a control signal to the automatic regulating valve V7 through a signal wire to control the opening of the automatic regulating valve V7, the inlet end of the automatic regulating valve V7 is connected with the port G at the top of the liquid nitrogen storage tank 1 through a matched pipeline, the outlet end of the automatic regulating valve V7 is connected with the atmosphere through a matched pipeline, and the path is an exhaust system, so that the overpressure nitrogen at the top of the liquid nitrogen storage tank 1 can be discharged to the atmosphere for regulating the pressure in the tank of the liquid nitrogen storage tank 1; the inlet end of the vaporizer I6 is connected with the bottom port of the vacuum storage tank 7 through a matched pipeline, the outlet end of the vaporizer I6 is connected with the inlet end of the automatic regulating valve V5 through a matched pipeline, the outlet end of the automatic regulating valve V5 is connected with the inlet end of the manual stop valve V2 through a matched pipeline, the outlet end of the manual stop valve V2 is connected with the top port A of the storage tank 1 through a matched pipeline, the inlet end of the manual stop valve V3 is connected with the outlet pipeline of the automatic regulating valve V5 through a matched pipeline, the outlet end of the manual stop valve V3 is connected with the pressure transmitter I8 through a matched pipeline, the pressure transmitter I8 transmits a control signal to the automatic regulating valve V5 through a signal line so as to control the opening of the automatic regulating valve V5, the path is an external air supplementing system, whether the external air supplementing system works or not is controlled through the signal of the pressure transmitter I8 after the liquid nitrogen in the vacuum storage tank 7 is vaporized, compared with the self-pressurizing air supplementing system, the vaporizer I6 is always in a working state, the reaction time of the vaporizer II 5 is not required, the pressure in the tank 1 can be responded quickly, the pressure in the tank can be supplemented, the pressure in the liquid nitrogen storage tank 1 can be regulated quickly, the pressure can be reduced after the self-pressurizing system works, and the pressure in the working state can be regulated, and the stable time can be reached. The liquid nitrogen storage tank 1 is also connected with a breather valve 9 through a top port H, and the breather valve 9 automatically starts expiration and inspiration according to whether the pressure in the tank of the liquid nitrogen storage tank 1 reaches a set positive and negative value or not, so that the safety of the liquid nitrogen storage tank 1 is ensured.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention disclosed in the embodiments of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (5)

1. The liquid nitrogen storage tank (1) is provided with a liquid inlet device, the liquid inlet device comprises a manual stop valve (V1) and a matched pipeline, the inlet end of the manual stop valve (V1) is connected with a fractionating tower cold box (2), and the outlet end of the manual stop valve is connected with a top port B of the liquid nitrogen storage tank (1); the liquid nitrogen storage tank (1) is provided with a liquid discharge device, the liquid discharge device comprises a low-temperature liquid pump (3) and a matched pipeline, the inlet end of the low-temperature liquid pump (3) is connected with a bottom port E of the liquid nitrogen storage tank (1), and the outlet end is connected with a user; the liquid nitrogen storage tank air supplementing system for the high-flow instant discharging is characterized by comprising a self-pressurization air supplementing system, an external air supplementing system and an exhaust system;
the inlet end of a manual stop valve (V4) of the self-pressurization air supplementing system is connected with a top port C of a liquid nitrogen storage tank (1) through a matched pipeline, and the outlet end of the manual stop valve is connected with a pressure transmitter II (4); the pressure transmitter II (4) transmits a control signal to the automatic regulating valve (V6) through a signal line, the inlet end of the automatic regulating valve (V6) is connected with the bottom port F of the liquid nitrogen storage tank (1) through a matched pipeline, the outlet end of the automatic regulating valve (V6) is connected with the inlet end of the vaporizer II (5) through a matched pipeline, and the outlet end of the vaporizer II (5) is connected with the top port D of the liquid nitrogen storage tank (1) through a matched pipeline;
the vacuum storage tank (7) of the external air supplementing system stores liquid nitrogen, the inlet end of the vaporizer I (6) is connected with the bottom port of the vacuum storage tank (7) through a matched pipeline, the outlet end of the vaporizer I is connected with the inlet end of the automatic regulating valve (V5) through a matched pipeline, the outlet end of the automatic regulating valve (V5) is connected with the inlet end of the manual stop valve (V2) through a matched pipeline, and the outlet end of the manual stop valve (V2) is connected with the top port A of the liquid nitrogen storage tank (1) through a matched pipeline; the inlet end of the manual stop valve (V3) is connected with the outlet pipeline of the automatic regulating valve (V5) through a matched pipeline, the outlet end of the manual stop valve (V3) is connected with the pressure transmitter I (8) through a matched pipeline, and the pressure transmitter I (8) transmits a control signal to the automatic regulating valve (V5) through a signal line;
the inlet end of a manual stop valve (V4) of the exhaust system is connected with a top port C of a liquid nitrogen storage tank (1) through a matched pipeline, and the outlet end of the manual stop valve is connected with a pressure transmitter II (4); the pressure transmitter II (4) transmits a control signal to the automatic regulating valve (V7) through a signal line, the inlet end of the automatic regulating valve (V7) is connected with the top port G of the liquid nitrogen storage tank (1) through a matched pipeline, and the outlet end of the automatic regulating valve (V7) is connected with the atmosphere through a matched pipeline;
during operation, liquid nitrogen in the fractionating tower cold box (2) enters the liquid nitrogen storage tank (1) through a manual stop valve (V1) and a matched pipeline through a port B of the liquid nitrogen storage tank (1) for storage of liquid nitrogen for later use; when the liquid nitrogen storage tank (1) supplies liquid nitrogen to the outside, the low-temperature liquid pump (3) conveys liquid nitrogen to a user through a matched pipeline, and the liquid nitrogen in the liquid nitrogen storage tank (1) is rapidly reduced due to the large working flow of the low-temperature liquid pump (3), so that the situation that the pressure of the liquid nitrogen storage tank (1) is reduced too quickly occurs; meanwhile, a pressure transmitter I (8) of the external air supplementing system and a pressure transmitter II (4) of the self-pressurization air supplementing system detect that the in-tank pressure of the liquid nitrogen storage tank (1) drops too fast and reaches a set value, the pressure transmitter I (8) transmits a control signal to an automatic regulating valve (V5), the pressure transmitter II (4) transmits the control signal to an automatic regulating valve (V6), and when the pressure transmitter II (4) detects that the in-tank pressure of the liquid nitrogen storage tank (1) rises too fast and reaches the set value, the pressure transmitter II (4) transmits the control signal to the automatic regulating valve (V7);
for the external air supplementing system, the manual stop valve (V2) and the manual stop valve (V3) are normally open valves, and the carburetor I (6) is always in a working state; the automatic regulating valve (V5) is opened after receiving a control signal from the pressure transmitter I (8), and nitrogen gasified from the gasifier I (6) rapidly enters the liquid nitrogen storage tank (1) through a matched pipeline, the automatic regulating valve (V5), the manual stop valve (V2) and a top port A of the liquid nitrogen storage tank (1) for pressure compensation;
for the self-pressurization air supplementing system, an automatic regulating valve (V6) is opened after receiving a control signal of a pressure transmitter II (4), liquid nitrogen in a liquid nitrogen storage tank (1) is gasified from a bottom port F of the liquid nitrogen storage tank (1) to a carburetor II (5) through a matched pipeline, and then the pressure of the liquid nitrogen storage tank (1) is supplemented from a top port D of the liquid nitrogen storage tank (1) through the matched pipeline; because the self-pressurization air-supplementing system needs vaporization time, the liquid nitrogen in the liquid nitrogen storage tank (1) is pressurized after vaporization, and the self-pressurization air-supplementing system and the external air-supplementing system simultaneously pressurized the liquid nitrogen storage tank (1) after the lag time is reached, so that the regulation time of the pressure stabilization of the liquid nitrogen storage tank (1) is shortened;
for an exhaust system, an automatic regulating valve (V7) is opened after receiving a control signal of a pressure transmitter II (4), and nitrogen in a liquid nitrogen storage tank (1) is discharged into the atmosphere from a top port G of the liquid nitrogen storage tank (1) through the automatic regulating valve (V7) through a matched pipeline, so that the pressure in the tank is quickly stabilized.
2. The tank air make-up system for high-flow instantaneous discharge liquid nitrogen according to claim 1, wherein said vaporizer ii (5) comprises two parallel vaporizers, which are switched in operation.
3. The tank air make-up system for high-flow instantaneous discharge liquid nitrogen according to claim 1, wherein said vaporizer i (6) comprises two parallel vaporizers, which are switched in operation.
4. The system for supplementing air to a liquid nitrogen storage tank with high-flow instantaneous discharge according to claim 1, wherein the cryogenic liquid pump (3) comprises a plurality of cryogenic liquid pumps (3) which are connected in parallel, and one or a plurality of the cryogenic liquid pumps are selected to be started according to the flow rate of discharged liquid.
5. The air supplementing system for the liquid nitrogen storage tank with the high flow instantaneous discharge according to claim 1, wherein a breather valve (9) is arranged at the top of the liquid nitrogen storage tank (1), the breather valve (9) is communicated with a top port H of the liquid nitrogen storage tank (1), the breather valve (9) breathes when the in-tank pressure of the liquid nitrogen storage tank (1) reaches a set positive warning threshold value, and the breather valve (9) breathes when the in-tank pressure of the liquid nitrogen storage tank (1) reaches a set negative warning threshold value.
CN202310389826.0A 2023-04-13 2023-04-13 Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system Pending CN116336376A (en)

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CN202310389826.0A CN116336376A (en) 2023-04-13 2023-04-13 Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system

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CN202310389826.0A CN116336376A (en) 2023-04-13 2023-04-13 Be used for high-flow instantaneous discharge liquid nitrogen storage tank air supplementing system

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CN116336376A true CN116336376A (en) 2023-06-27

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