CN114791180B - Adjustable low-temperature storage tank liquid circulation injection system - Google Patents
Adjustable low-temperature storage tank liquid circulation injection system Download PDFInfo
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- CN114791180B CN114791180B CN202210260837.4A CN202210260837A CN114791180B CN 114791180 B CN114791180 B CN 114791180B CN 202210260837 A CN202210260837 A CN 202210260837A CN 114791180 B CN114791180 B CN 114791180B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
- F25B19/04—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam using liquid jet, e.g. of water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- 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
Abstract
The invention relates to an adjustable low-temperature storage tank liquid circulation injection system, which comprises a low-temperature storage tank, a liquid subcooler, a circulating pump, a flow regulating valve, a porous injection rod and a liquid nitrogen storage tank, wherein the top end of the low-temperature storage tank is connected with an exhaust pipe, a liquid filling pipe and a pressurizing pipe; the flow regulating valve is used for controlling the proportion of the first path of liquid and the second path of liquid, and further controlling the temperature of the sprayed liquid. The invention can cool saturated liquid into a supercooled state which can be quantitatively controlled; mechanical disturbance and thermal disturbance are applied to the gas-liquid two-phase flow field, so that the temperature and pressure equalization and pressure reduction in the storage tank are realized.
Description
Technical Field
The invention relates to an injection mixing system, in particular to an adjustable low-temperature storage tank liquid circulation injection system.
Background
With the continuous development of low-temperature propellants in the aerospace field, the long-term storage technology of two-phase low temperature Chu Xiang is becoming a key bottleneck. The space thermal load tends to cause a sustained increase in tank pressure with concomitant formation of temperature stratification. Pressure management techniques applicable to space microgravity environment in the current development stage include thermal exhaust systems (TVS), pump-driven mixing techniques and the like. However, the mechanical disturbance and thermal disturbance effects applied to the two-phase storage tank by the injection mixing link related to the above technology are still undefined, and the temperature equalization and pressure reduction characteristics brought by the injection mixing link are still not clear. Analysis of the effect of spray flow rate, spray temperature, and spray pattern on the temperature field and phase change in the tank is an entry point to address this problem.
In the prior art, some low-temperature two-phase tank circulation injection systems exist, however, the currently disclosed low-temperature two-phase tank circulation injection systems cannot meet the requirements of independent adjustment of injection flow and injection temperature, closed circulation injection, zero loss of stored liquid and visualization of injection flow beams.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an adjustable low-temperature storage tank liquid circulation injection system.
The adjustable low-temperature storage tank liquid circulation injection system can fully cool the two-phase low-temperature fluid storage tank with the boiling point higher than 77K, and cool saturated liquid into a supercooled state capable of being quantitatively controlled; mechanical disturbance and thermal disturbance are applied to the gas-liquid two-phase flow field, so that the temperature and pressure equalization and pressure reduction in the storage tank are realized.
The aim of the invention can be achieved by the following technical scheme:
the invention provides an adjustable low-temperature storage tank liquid circulation injection system, which comprises:
a low-temperature storage tank, a liquid subcooler, a circulating pump, a flow regulating valve, a porous spray rod and a liquid nitrogen storage tank,
the top end of the low-temperature storage tank is connected with an exhaust pipe, a liquid filling pipe and a pressurizing pipe, the liquid filling pipe and the pressurizing pipe are respectively connected with a liquid supply end and a gas supply end of the liquid nitrogen storage tank,
the porous spray rod is positioned in the low-temperature storage tank,
the bottom of the low-temperature storage tank is provided with a liquid nitrogen outlet, the liquid nitrogen outlet is divided into two paths of liquid after passing through a circulating pump, the first path of liquid enters a liquid subcooler and is cooled to a supercooled state, the second path of liquid is converged with the first path of liquid after flowing through a flow regulating valve, and the second path of liquid enters a porous spray rod together, is sprayed out in a low temperature Chu Xiang through the porous spray rod and is used for reducing the pressure in a low temperature Chu Xiang;
the flow regulating valve is used for controlling the proportion of the first path of liquid to the second path of liquid, and further controlling the temperature of the sprayed liquid.
In one embodiment of the invention, a thermometer is arranged in front of a pipeline which is formed by merging the second liquid with the first liquid after flowing through the flow regulating valve and then entering the porous spray rod.
In one embodiment of the present invention, a pressure gauge is disposed within the cryogenic Chu Xiang.
In one embodiment of the invention, the liquid subcooler is positioned in the vacuum heat insulation cavity, the top end of the liquid subcooler is welded and sealed with the vacuum heat insulation cavity, an open liquid nitrogen tank is arranged in the liquid subcooler, a heat exchanger is arranged in the open liquid nitrogen tank, and the open liquid nitrogen tank is used for supplying cold energy to the heat exchanger and cooling the first path of liquid flowing through the heat exchanger to a supercooled state.
In one embodiment of the invention, the liquid nitrogen storage tank is further provided with a liquid nitrogen supplementing pipe for supplementing liquid nitrogen to the open liquid nitrogen tank, and when the open liquid nitrogen tank consumes part of the liquid nitrogen due to evaporation or cooling, the liquid nitrogen storage tank is supplemented to a normal state.
In one embodiment of the invention, the heat exchanger is a coil heat exchanger.
In one embodiment of the invention, the heat exchanger is made of red copper and has a bidirectional spiral structure.
In one embodiment of the invention, the low temperature Chu Xiang, the circulation pump, the flow regulating valve, and the piping between the low temperature Chu Xiang and the liquid subcooler are located inside a vacuum insulating chamber.
In one embodiment of the invention, a filter is arranged on the pipeline between the liquid nitrogen outlet and the circulating pump, and the filter is used for filtering impurities of the liquid nitrogen.
In one embodiment of the invention, the circulating pump is a small low-temperature centrifugal pump, and the front section of the pump impeller is provided with a flow director. The pump inlet and outlet are connected in ultra-high sealing VCR joint and the upstream is connected to filter. The rotational speed of the pump may be regulated by a variable frequency controller.
In one embodiment of the invention, a first flowmeter is arranged on a pipeline where the first liquid is located, and a second flowmeter is arranged on a pipeline where the second liquid is located.
The second flow meter is used for measuring the jet flow rate, and the first flow meter is used for measuring the flow rate of the cooled liquid.
In one embodiment of the invention, the porous spray rod is a single hollow seal rod, the porous spray rod is provided with spray holes oriented in four orthogonal directions at each horizontal height, and the porous spray rod is vertically located at the center of the low temperature Chu Xiang.
In one embodiment of the invention, the bottom of the porous spray rod is in sealing connection with the bottom end of the low-temperature storage tank through the CF flange, and the liquid inlet interface of the porous spray rod is a detachable high-tightness VCR joint, so that spray rods with different spray hole densities and pore diameters can be replaced conveniently.
In one embodiment of the present invention, the flow rate control valve is a precision pneumatic flow rate control valve, and the opening degree is controlled by inputting a current signal.
In one embodiment of the invention, the adjustable cryogenic tank fluid circulation injection system further comprises a COMS camera, a data acquisition and control system and a computer,
the side surface of the low-temperature storage tank is provided with an observation window, the COMS camera is positioned at the outer side of the observation window and is used for recording the internal dynamic state of the low-temperature storage tank,
the data acquisition and control system is respectively connected with the COMS camera, the second flowmeter, the first flowmeter, the thermometer, the pressure gauge and the flow regulating valve, and is used for uniformly acquiring, displaying and storing the readings of the image of the COMS camera, the second flowmeter, the first flowmeter, the thermometer, the pressure gauge and the flow regulating valve to a computer, wherein the computer is connected with the circulating pump, and the starting and the stopping of the circulating pump are controlled through a computer program.
In one embodiment of the invention, the side surface of the low-temperature storage tank is provided with a coaxial observation window and a coaxial light window, the COMS camera and the LED surface light source are respectively hung outside the observation window and the light window through thin epoxy resin rods, and jet flow beam images are acquired in real time.
In one embodiment of the invention, the viewing window and the light window are sealed with CF planar glass flanges.
In one embodiment of the present invention, the low temperature Chu Xiang is a middle straight cylinder, two-end elliptical end enclosure structure, and is wrapped with a plurality of layers of heat insulation materials.
When the adjustable low-temperature storage tank liquid circulation injection system provided by the invention is used,
when the pressure of the low-temperature storage tank is higher than a set critical value, the circulating pump is started, liquid nitrogen is pumped from the low-temperature Chu Xiangde part, and impurities are filtered through the filter. After the liquid nitrogen obtains the lift, the liquid nitrogen is divided into two parts, the first liquid enters a liquid subcooler and is cooled to a supercooled state, the second liquid flows through a flow regulating valve and then is combined with the first liquid, the second liquid enters a porous spray rod together, and the second liquid is sprayed in a low temperature Chu Xiang through the porous spray rod and is used for reducing the pressure in a low temperature Chu Xiang;
the flow regulating valve is used for controlling the proportion of the first path of liquid to the second path of liquid, and further controlling the temperature of the sprayed liquid. The flow regulating valve is a precise pneumatic flow regulating valve, and the opening degree is regulated by inputting a current signal. When the injection flow needs to be regulated, the rotation speed of the circulating pump can be changed. The injection flow is measured by a second flow meter. When the temperature of the injected liquid needs to be regulated, the opening degree of the flow regulating valve can be changed, so that the flow ratio of the cooled liquid is regulated. The injection temperature is measured by a thermometer on a pipeline where the second path of liquid flows through the flow regulating valve and then is converged with the first path of liquid and then enters the porous injection rod, and is recorded as injection temperature Tp5, and the flow of the cooled liquid is measured by the first flow meter. In the technical scheme of the application, the injection temperature Tp5 is used as a feedback source, and a current signal is output to the flow regulating valve through the closed-loop PID module, so that the injection temperature is automatically controlled to be near a set value.
In the technical scheme of the invention, the data acquisition and control system, the computer and related data materials, calculation, control and the like are all known technologies and can be realized by adopting conventional technical means in the field.
The invention takes the injection temperature as a feedback source, and outputs a current signal to the pneumatic flow regulating valve through the closed-loop PID module, thereby controlling the injection temperature to be near a set value. Since the total flow rate of the circulating injection and the injection temperature are controlled by the circulating pump and the flow regulating valve, respectively, the two have relative independence.
Compared with the prior art, the invention has the following advantages:
1. the independent adjustment of the injection flow and the injection temperature can be realized.
2. The whole injection process is closed circulation, and experimental variables such as liquid level height and the like can be maintained constant.
3. And features such as spray manifold, spray form, atomization degree and the like are visually observed and recorded, so that the spray manifold is convenient to compare with simulation.
Drawings
FIG. 1 is a schematic diagram of a liquid circulation injection system of an adjustable cryogenic tank in accordance with embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a porous spray bar of the adjustable cryogenic tank fluid circulation spray system of example 1 of the present invention.
Reference numerals in the drawings:
1. the device comprises a vacuum heat insulation cavity 2, a low-temperature storage tank 3, a filter 4, a circulating pump 5, a second flowmeter 6, a first flowmeter 7, a liquid subcooler 8, a heat exchanger 9, an open liquid nitrogen tank 10, a flow regulating valve 11, a porous spray rod 12, an LED (light emitting diode) area light source 13, an optical window 14, a COMS (complementary metal oxide semiconductor) camera 15, an observation window 16, a liquid nitrogen storage tank 17, a data acquisition and control system 18, a computer 19, an exhaust pipe 20, a liquid filling pipe 21 and a pressurizing pipe;
111. jet holes, 112, CF flange, 113, VCR joints.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; the device can be mechanically connected, electrically connected, physically connected or wirelessly connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Examples
Referring to fig. 1, the present embodiment provides an adjustable cryogenic tank liquid circulation injection system, comprising: the low-temperature storage tank 2, the liquid subcooler 7, the circulating pump 4, the flow regulating valve 10, the porous spray rod 11 and the liquid nitrogen storage tank 16, wherein the top end of the low-temperature storage tank 2 is connected with the exhaust pipe 19, the liquid filling pipe 20 and the pressurizing pipe 21 are respectively connected with the liquid supply end and the gas supply end of the liquid nitrogen storage tank 16, the porous spray rod 11 is positioned in the low-temperature storage tank 2, a liquid nitrogen outlet is arranged at the bottom of the low-temperature storage tank 2, the liquid nitrogen outlet is divided into two paths of liquid after passing through the circulating pump 4, the first path of liquid enters the liquid subcooler 7 to be cooled to a supercooled state, the second path of liquid is converged with the first path of liquid after flowing through the flow regulating valve 10, enters the porous spray rod 11 together, and is sprayed out in the low-temperature storage tank 2 through the porous spray rod 11 to reduce the pressure in the low-temperature storage tank 2; the flow regulating valve 10 is used for controlling the ratio of the first path of liquid to the second path of liquid, and further controlling the temperature of the injected liquid.
Further, referring to fig. 1, in the present embodiment, a thermometer is provided before the pipe where the second liquid flows through the flow rate adjusting valve 10 and then merges with the first liquid and then enters the porous spray bar 11.
Further, referring to fig. 1, a pressure gauge is provided in the cryogenic tank 2 in the present embodiment.
Further, referring to fig. 1, in this embodiment, the liquid subcooler 7 is located inside the vacuum insulation cavity 1, the top end of the liquid subcooler 7 is welded and sealed with the vacuum insulation cavity 1, an open liquid nitrogen tank 9 is disposed in the liquid subcooler 7, a heat exchanger 8 is disposed in the open liquid nitrogen tank 9, and the open liquid nitrogen tank 9 is used for supplying cooling capacity to the heat exchanger 8, so that the first path of liquid flowing through the heat exchanger 8 is cooled to a supercooled state.
Further, referring to fig. 1, in the present embodiment, the liquid nitrogen tank 16 is further provided with a liquid nitrogen replenishment pipe for replenishing the open liquid nitrogen tank 9 with liquid nitrogen, and when the open liquid nitrogen tank 9 consumes part of the liquid nitrogen by evaporation or cooling, the liquid nitrogen tank 16 is replenished with liquid to a normally full state.
Further, referring to fig. 1, in this embodiment, the heat exchanger 8 is a coiled heat exchanger, and is made of red copper, and has a bidirectional spiral structure.
Further, referring to fig. 1, in the present embodiment, the low temperature tank 2, the circulation pump 4, the flow rate regulating valve 10, and the piping between the low temperature tank 2 and the liquid subcooler 7 are located inside the vacuum insulation chamber 1.
Further, referring to fig. 1, in the present embodiment, a filter 3 is provided on a line between the liquid nitrogen outlet and the circulation pump 4, and the filter 3 is used for filtering impurities in the liquid nitrogen. The circulating pump 4 is a small low-temperature centrifugal pump, and a deflector is arranged at the front section of the pump impeller. The pump inlet and outlet are connected in a way of ultra-high sealing VCR joint, and the upstream is connected with the filter 3. The rotational speed of the pump may be regulated by a variable frequency controller.
Further, referring to fig. 1, in the present embodiment, a first flowmeter 6 is provided on a line where a first liquid is located, and a second flowmeter 5 is provided on a line where a second liquid is located. The second flowmeter 5 is used for measuring the jet flow rate, and the first flowmeter 6 is used for measuring the flow rate of the cooled liquid.
Further, referring to fig. 2, in this embodiment, the porous spray rod 11 is a single hollow seal rod, the porous spray rod 11 is provided with spray holes 111 oriented in four orthogonal directions at each horizontal height, and the porous spray rod 11 is vertically located at the center of the low-temperature tank 2.
Further, referring to fig. 2, in this embodiment, the bottom of the porous spray rod 11 is connected with the bottom end of the low-temperature tank 2 in a sealing manner through a CF flange 112, and the liquid inlet interface of the porous spray rod 11 is a detachable VCR joint 113 with high tightness, so as to facilitate replacement of spray rods with different spray hole densities and diameters.
Further, in the present embodiment, the flow rate adjustment valve 10 is a precision pneumatic flow rate adjustment valve, and the opening degree is adjusted by inputting a current signal.
Further, referring to fig. 1, in this embodiment, the adjustable cryogenic tank liquid circulation injection system further includes a COMS camera 14, a data acquisition and control system 17, and a computer 18, where an observation window 15 is disposed on a side of the cryogenic tank 2, the COMS camera 14 is located outside the observation window 15 and is used for recording internal dynamics of the cryogenic tank 2, the data acquisition and control system 17 is respectively connected with the COMS camera 14, the second flowmeter 5, the first flowmeter 6, the thermometer, the pressure gauge, and the flow regulating valve 10, and the data acquisition and control system 17 is used for uniformly acquiring, displaying and storing readings of the COMS camera 14, the second flowmeter 5, the first flowmeter 6, the thermometer, the pressure gauge, and the flow regulating valve 10 to the computer 18, and the computer 18 is connected with the circulation pump 4, and controls start and stop of the circulation pump 4 through a computer program. The side of the low-temperature storage tank 2 is provided with a coaxial observation window 15 and a coaxial light window 13, the COMS camera 14 and the LED surface light source 12 are respectively hung on the outer sides of the observation window 15 and the light window 13 through thin epoxy resin rods, and jet flow beam images are acquired in real time.
Further, referring to fig. 1, in this embodiment, the viewing window 15 and the optical window 13 are sealed by using CF planar glass flanges.
Further, referring to fig. 1, in this embodiment, the low-temperature tank 2 is a middle straight cylinder, two ends of which are oval end enclosure structures, and is wrapped with a plurality of layers of heat insulation materials.
When the adjustable low-temperature storage tank liquid circulation injection system provided by the embodiment is used, when the pressure of the low-temperature storage tank 2 is higher than a set critical value, the circulation pump 4 is started, liquid nitrogen is extracted from the bottom of the low-temperature storage tank 2, and impurities are filtered through the filter 3. After the liquid nitrogen obtains the lift, the liquid nitrogen is divided into two parts, the first liquid enters the liquid subcooler 7 and is cooled to a supercooled state, the second liquid flows through the flow regulating valve 10 and then is combined with the first liquid, the second liquid enters the porous injection rod 11 together, and is injected into the low-temperature storage tank 2 through the porous injection rod 11 to be discharged, so that the pressure in the low-temperature storage tank 2 is reduced; the flow regulating valve 10 is used for controlling the ratio of the first path of liquid to the second path of liquid, and further controlling the temperature of the injected liquid. The flow rate control valve 10 is a precision pneumatic flow rate control valve, and the opening degree is controlled by inputting a current signal. When the injection flow rate needs to be regulated, the rotation speed of the circulating pump 4 can be changed. The injection flow is measured by the second flow meter 5. When the temperature of the injected liquid needs to be adjusted, the opening degree of the flow rate adjusting valve 10 can be changed, and the flow rate ratio of the cooled liquid can be adjusted. The injection temperature is measured by a thermometer on a pipeline where the second path liquid flows through the flow regulating valve 10 and then is merged with the first path liquid and enters the porous injection rod 11, and is recorded as an injection temperature Tp5, and the flow rate of the cooled liquid is measured by the first flowmeter 6. In the technical scheme of the application, the injection temperature Tp5 is used as a feedback source, and a current signal is output to the flow regulating valve 10 through the closed-loop PID module, so that the injection temperature is automatically controlled to be near a set value.
In the technical scheme provided by the embodiment, the data acquisition and control system, the computer and related data materials, calculation, control and the like are all known technologies and can be realized by adopting conventional technical means in the field.
The scheme provided by the embodiment takes the injection temperature as a feedback source, and outputs a current signal to the pneumatic flow regulating valve through the closed-loop PID module, so that the injection temperature is controlled to be near a set value. Since the total flow rate of the circulating injection and the injection temperature are controlled by the circulating pump and the flow regulating valve, respectively, the two have relative independence.
The whole set of circulating injection system provided by the embodiment can sufficiently cool the two-phase low-temperature fluid storage tank with the boiling point higher than 77K, and cool saturated liquid into a supercooled state capable of being quantitatively controlled; mechanical disturbance and thermal disturbance are applied to the gas-liquid two-phase flow field, so that the temperature and pressure equalization and pressure reduction in the storage tank are realized. And an experimental scheme is provided for visual research of gas-liquid injection mixing in the storage tank.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (8)
1. An adjustable cryogenic tank fluid circulation injection system comprising:
a low-temperature storage tank (2), a liquid subcooler (7), a circulating pump (4), a flow regulating valve (10), a porous spray rod (11) and a liquid nitrogen storage tank (16),
the top end of the low-temperature storage tank (2) is connected with an exhaust pipe (19), a liquid filling pipe (20) and a pressurizing pipe (21), the liquid filling pipe (20) and the pressurizing pipe (21) are respectively connected with a liquid supply end and a gas supply end of the liquid nitrogen storage tank (16),
the porous spray rod (11) is positioned in the low-temperature storage tank (2),
the bottom of the low-temperature storage tank (2) is provided with a liquid nitrogen outlet, the liquid nitrogen outlet is divided into two paths of liquid after passing through a circulating pump (4), the first path of liquid enters a liquid subcooler (7) and is cooled to a supercooled state, the second path of liquid is converged with the first path of liquid after flowing through a flow regulating valve (10), and the second path of liquid enters a porous spray rod (11) together, is sprayed in the low-temperature storage tank (2) through the porous spray rod (11) and is used for reducing the pressure in the low-temperature storage tank (2);
the flow regulating valve (10) is used for controlling the proportion of the first path of liquid to the second path of liquid so as to control the temperature of the injected liquid;
the liquid subcooler (7) is positioned in the vacuum insulation cavity (1), an open liquid nitrogen tank (9) is arranged in the liquid subcooler (7), a heat exchanger (8) is arranged in the open liquid nitrogen tank (9), the open liquid nitrogen tank (9) is used for supplying cold energy to the heat exchanger (8), and the first path of liquid flowing through the heat exchanger (8) is cooled to a supercooled state;
the low-temperature storage tank (2), the circulating pump (4), the flow regulating valve (10) and a pipeline between the low-temperature storage tank (2) and the liquid subcooler (7) are positioned in the vacuum insulation cavity (1).
2. An adjustable cryogenic tank liquid circulation injection system according to claim 1, characterized in that the liquid nitrogen storage tank (16) is further provided with a liquid nitrogen replenishing pipe for replenishing the open liquid nitrogen tank (9) with liquid nitrogen, which is replenished to a normal state by the liquid nitrogen storage tank (16) when the open liquid nitrogen tank (9) consumes part of the liquid nitrogen due to evaporation or cooling.
3. An adjustable cryogenic tank liquid circulation injection system according to claim 1, characterized in that a filter (3) is arranged in the line between the liquid nitrogen outlet and the circulation pump (4).
4. An adjustable cryogenic tank fluid circulation injection system according to claim 1, characterized in that the porous injection rod (11) is a single hollow ejector rod, the porous injection rod (11) is provided with injection holes (111) oriented in four orthogonal directions at each level, and the porous injection rod (11) is vertically located in the center of the cryogenic tank (2).
5. An adjustable cryogenic tank fluid circulation injection system according to claim 1, characterized in that the flow regulating valve (10) is a precision pneumatic flow regulating valve, the opening being adjusted by inputting a current signal.
6. An adjustable cryogenic tank fluid circulation injection system according to claim 1, characterized in that a first flowmeter (6) is arranged on the first fluid line and a second flowmeter (5) is arranged on the second fluid line, the second flowmeter (5) is used for measuring the injection flow, and the first flowmeter (6) is used for measuring the flow of the cooled fluid.
7. An adjustable cryogenic tank fluid circulation injection system according to claim 6, characterized in that a thermometer is arranged in front of the pipe line where the second fluid after flowing through the flow regulating valve (10) merges with the first fluid and enters the porous injection rod (11);
a pressure gauge is arranged in the low-temperature storage tank (2).
8. An adjustable cryogenic tank fluid circulation injection system according to claim 7, further comprising a COMS camera (14), a data acquisition and control system (17) and a computer (18),
an observation window (15) is arranged on the side face of the low-temperature storage tank (2), the COMS camera (14) is positioned at the outer side of the observation window (15) and used for recording the internal dynamic state of the low-temperature storage tank (2),
the data acquisition and control system (17) is respectively connected with the COMS camera (14), the second flowmeter (5), the first flowmeter (6), the thermometer, the pressure gauge and the flow regulating valve (10), the data acquisition and control system (17) is used for uniformly acquiring, displaying and storing the images of the COMS camera (14), the second flowmeter (5), the first flowmeter (6), the thermometer, the pressure gauge and the readings of the flow regulating valve (10) to the computer (18), the computer (18) is connected with the circulating pump (4), and the starting and stopping of the circulating pump (4) are controlled through a computer program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260837.4A CN114791180B (en) | 2022-03-16 | 2022-03-16 | Adjustable low-temperature storage tank liquid circulation injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260837.4A CN114791180B (en) | 2022-03-16 | 2022-03-16 | Adjustable low-temperature storage tank liquid circulation injection system |
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| Publication Number | Publication Date |
|---|---|
| CN114791180A CN114791180A (en) | 2022-07-26 |
| CN114791180B true CN114791180B (en) | 2023-06-06 |
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| CN202210260837.4A Active CN114791180B (en) | 2022-03-16 | 2022-03-16 | Adjustable low-temperature storage tank liquid circulation injection system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1612495A1 (en) * | 2004-07-01 | 2006-01-04 | Messer Group GmbH | Method and apparatus for cooling products |
| JP2008145028A (en) * | 2006-12-08 | 2008-06-26 | Cool Technos:Kk | Intermittent injection device of liquefied nitrogen gas |
| CN201992899U (en) * | 2011-03-15 | 2011-09-28 | 深圳市西谷制冷设备有限公司 | Low-temperature refrigerating plant with single compressor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6631615B2 (en) * | 2000-10-13 | 2003-10-14 | Chart Inc. | Storage pressure and heat management system for bulk transfers of cryogenic liquids |
| US20100223934A1 (en) * | 2009-03-06 | 2010-09-09 | Mccormick Stephen A | Thermoacoustic Refrigerator For Cryogenic Freezing |
| FR3004784B1 (en) * | 2013-04-18 | 2015-04-10 | Air Liquide | METHOD AND SYSTEM FOR SUPPLYING AT LEAST ONE WORKING UNIT IN SUB-COOLING CRYOGENIC LIQUID |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1612495A1 (en) * | 2004-07-01 | 2006-01-04 | Messer Group GmbH | Method and apparatus for cooling products |
| JP2008145028A (en) * | 2006-12-08 | 2008-06-26 | Cool Technos:Kk | Intermittent injection device of liquefied nitrogen gas |
| CN201992899U (en) * | 2011-03-15 | 2011-09-28 | 深圳市西谷制冷设备有限公司 | Low-temperature refrigerating plant with single compressor |
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| CN114791180A (en) | 2022-07-26 |
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