A low-temperature circulation test system for gas-liquid two-phase flow mixing

Abstract

The present invention discloses a low-temperature circulation test system for gas-liquid two-phase flow mixing, comprising a first liquid storage tank, a second liquid storage tank, a test device, an air supply device, a first circuit and a second circuit, wherein the air supply device is connected to the test device and is used to provide gas to the test device, the first circuit is respectively connected to the first liquid storage tank, the test device and the second liquid storage tank, and the liquid in the first liquid storage tank can flow into the test device and the second liquid storage tank in sequence through the first circuit, the second circuit is respectively connected to the second liquid storage tank, the test device and the first liquid storage tank, and the liquid in the second liquid storage tank can enter the first liquid storage tank through the second circuit, so that the liquid can circulate between the first liquid storage tank and the second liquid storage tank. The test system can achieve gas-liquid two-phase flow mixing without the need for a low-temperature liquid circulation pump, and the liquid can be circulated between the first liquid storage tank and the second liquid storage tank, thereby reducing the cost of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of two-phase flow mixing, and in particular to a low-temperature circulation test system for gas-liquid two-phase flow mixing. Background Art

[0002] In the staged combustion cycle of a liquid oxygen-kerosene engine, liquid oxygen reacts with a small amount of kerosene in the gas generator to produce high-temperature, oxygen-rich gas that drives the turbine. After passing through the turbine, the pressure of the high-temperature, oxygen-rich gas decreases, slightly exceeding the pressure in the liquid oxygen pipeline after the pre-pressurization pump. To simplify the system piping layout and recover the oxygen-rich gas, this oxygen-rich gas is introduced into a gas chamber outside the liquid oxygen pipeline after the pre-pressurization pump and then injected into the pipeline through air holes in the pipe wall. The superheated gas and the subcooled liquid oxygen exchange heat and mass. To avoid cavitation erosion in the main pump, which threatens the safe operation of the engine, the oxygen-rich gas must be completely condensed before the main pump inlet. This condensation method, in which the cooled gas and liquid are directly mixed without passing through an intermediate wall, is called direct contact condensation.

[0003] The condensation of superheated gas jets in subcooled liquids at room temperature has a long history of research, with corresponding experimental studies on the heat transfer coefficient of direct contact condensation, condensation control mechanisms, jet shape, and condensation length. Research on mixing condensation in the inter-pump piping of cryogenic liquid engines urgently requires such research support, necessitating high-flow gas-liquid two-phase mixing experiments at low temperatures.

[0004] Existing gas-liquid two-phase flow mixing tests generally require cryogenic liquid circulation pumps. However, the high price of cryogenic liquid circulation pumps increases the cost of gas-liquid two-phase flow mixing tests. These tests also consume a large amount of cryogenic liquid. Due to the high price of cryogenic liquid circulation pumps and their limited flow rate range, large-scale gas-liquid two-phase flow mixing tests require liquid oxygen or liquid nitrogen tank trucks directly connected to the test equipment to supply the required cryogenic fluid. This results in a large amount of cryogenic fluid waste and makes it difficult to discharge. Cryogenic fluid that still has application value after only one test cannot be reused, further increasing the cost of the test. Summary of the Invention

[0005] Based on this, it is necessary to provide a low-temperature circulation test system for gas-liquid two-phase flow mixing to solve the technical problems of high price of liquid circulation pumps used in gas-liquid two-phase flow mixing in the prior art and liquid waste leading to increased test costs.

[0006] The present invention provides a low-temperature circulation test system for gas-liquid two-phase flow mixing, comprising:

[0007] First liquid storage tank;

[0008] Second liquid storage tank;

[0009] Test equipment;

[0010] a gas supply device connected to the test device and configured to supply gas to the test device;

[0011] a first circuit, wherein the first circuit is connected to the first liquid storage tank, the test device, and the second liquid storage tank, respectively, so that the liquid in the first liquid storage tank can flow into the test device and the second liquid storage tank in sequence through the first circuit; and

[0012] The second circuit is connected to the second liquid storage tank, the test device and the first liquid storage tank respectively, and the liquid in the second liquid storage tank can flow into the test device and the first liquid storage tank in sequence through the second circuit, so that the liquid can circulate between the first liquid storage tank and the second liquid storage tank.

[0013] Furthermore, the test system also includes a first boosting mechanism, which is connected to the first liquid storage tank. The first boosting mechanism is used to increase the air pressure in the first liquid storage tank so that the liquid in the first liquid storage tank flows into the test device and the second liquid storage tank in sequence through the first circuit.

[0014] Furthermore, the first boost mechanism includes a first vaporizer and a first boost opening valve, one end of the first vaporizer is connected to the first liquid storage tank, and the other end is connected to the first boost opening valve, and the end of the first boost opening valve away from the first vaporizer is connected to the first liquid storage tank.

[0015] Furthermore, the test system includes a second boosting mechanism, which is connected to the second liquid storage tank. The second boosting mechanism is used to increase the air pressure in the second liquid storage tank so that the liquid in the second liquid storage tank flows into the test device and the first liquid storage tank in sequence through the second circuit.

[0016] Furthermore, the test system also includes a first pressure reducing mechanism, which is connected to the first liquid storage tank. The first pressure reducing mechanism is used to reduce the air pressure in the first liquid storage tank so that the liquid in the second liquid storage tank flows into the test device and the first liquid storage tank in sequence through the second circuit.

[0017] Furthermore, the first circuit includes a first pipeline and a second pipeline, one end of the first pipeline is connected to the first liquid storage tank, and the other end of the first pipeline is connected to the test device, one end of the second pipeline is connected to the test device, and the other end of the second pipeline is connected to the second liquid storage tank, the first pipeline is provided with a first stop valve, and the second pipeline is provided with a second stop valve.

[0018] Further, the gas supply device is connected to the first liquid storage tank, and the gas supply device can provide gas to the first liquid storage tank to increase the pressure in the first liquid storage tank; or

[0019] The gas supply device is connected to the second liquid storage tank, and the gas supply device can provide gas to the second liquid storage tank to increase the pressure in the second liquid storage tank.

[0020] Furthermore, the test device includes an air injection section, a mixing section and a visualization section, the air injection section is flange-connected to the mixing section, and the mixing section is flange-connected to the visualization section.

[0021] Furthermore, the test system also includes a third pipeline and a third stop valve, one end of the third pipeline is connected to the gas supply device, and the other end is connected to the test device. The third stop valve is arranged in the third pipeline, and the third stop valve is used to control the cutoff and circulation of the gas in the third pipeline.

[0022] Furthermore, the test system further includes a heater, which is disposed in the third pipe and is used to heat the gas in the third pipe.

[0023] The present invention provides a low-temperature circulation test system for gas-liquid two-phase flow mixing. A gas supply device provides gas to the test device, and liquid is supplied to the test device through a first liquid storage tank, a second liquid storage tank, a first circuit, and a second circuit, so that the gas and liquid are mixed in the test device. At the beginning of the test, liquid is injected into the first liquid storage tank. The liquid in the first liquid storage tank flows into the test device through the first circuit. After entering the test device, the liquid mixes and reacts with the gas. The liquid in the test device flows into the second liquid storage tank through the first circuit. During this process, the liquid level in the first liquid storage tank decreases and the liquid level in the second liquid storage tank increases. When the liquid level in the first liquid storage tank decreases to a preset depth, the liquid in the second liquid storage tank flows into the test device through the second circuit. After entering the test device, the liquid mixes and reacts with the gas. The liquid in the test device flows into the first liquid storage tank through the second circuit. During this process, the liquid level in the second liquid storage tank increases and the liquid level in the first liquid storage tank decreases. The liquid circulates between the first and second liquid storage tanks through the first and second circuits, and the circulation path passes through the test device, so that the liquid and gas are mixed. This test system can achieve gas-liquid two-phase flow mixing without the need for a cryogenic liquid circulation pump, and the liquid can be circulated between the first liquid storage tank and the second liquid storage tank, solving the technical problem that liquid that still has application value after only one test cannot be reused, thereby reducing the cost of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 Schematic diagram of the structure of a low-temperature circulation test system for gas-liquid two-phase flow mixing in an embodiment of the present invention.

[0026] Main components:

[0027] A, first liquid storage tank; A1, first filling valve; A2, second filling valve; A3, first exhaust valve; A4, first relief valve; A5, first vacuum gauge; A6, first pressure gauge; A7, first liquid level gauge; A8, first liquid level gauge gas phase valve; A9, first liquid level gauge equalizing valve; A10, first liquid level gauge liquid phase valve; A11, first boost return valve; A12, first vaporizer; A13, first stop valve; A14, first boost opening valve; A15, first three-way valve; A16, first pressure regulating valve; A20, first safety valve; A21, first bursting disc; A22, second bursting disc; A23, second safety valve; A24, third safety valve; A26, first vacuum gauge;

[0028] B, second liquid storage tank; B1, third filling valve; B2, fourth filling valve; B4, second overflow valve; B5, second vacuum gauge; B6, second pressure gauge; B7, second liquid level gauge; B8, second liquid level gauge gas phase valve; B9, second liquid level gauge equalizing valve; B10, second liquid level gauge liquid phase valve; B11, second boost return valve; B12, second vaporizer; B13, fourth stop valve; B14, second boost opening valve; B15, second three-way valve; B16, second pressure regulating valve; B20, fourth safety valve; B21, third bursting disc; B22, fourth bursting disc; B23, fifth safety valve; B24, sixth safety valve; B26, second vacuum gauge; B27, third exhaust valve; 11, first pipeline; 12, second pipeline; 13, third pipeline; 14, fourth pipeline; 15, sixth pipeline;

[0029] C, air supply device; C1, second pressure reducing valve; C2, third pressure reducing valve; C3, third pressure gauge;

[0030] D. Test device; D1. First pressure reducing valve; D3. Filter; D4. Cryogenic mass flowmeter; D5. Seventh safety valve; D6. First temperature and pressure sensor; D8. Third stop valve; D9. Second regulating valve; D10. Gas flowmeter; D11. Heater; D12. Sixth stop valve; D14. Second temperature and pressure sensor; D15. Gas injection section; D16. Mixing section; D17. Third temperature and pressure sensor; D18. Visualization section; D19. Flange; D20. Eighth safety valve; D23. Second exhaust valve; D24. Second stop valve.

[0031] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] like Figure 1As shown, in some embodiments, a low-temperature circulation test system for gas-liquid two-phase flow mixing includes a first liquid storage tank A, a second liquid storage tank B, a gas supply device C, a test device D, a first circuit, and a second circuit. The gas supply device C is connected to the test device D and is used to provide gas to the test device D. The first circuit is connected to the first liquid storage tank A, the test device D, and the second liquid storage tank B, respectively. The liquid in the first liquid storage tank A can flow into the test device D and the second liquid storage tank B in sequence through the first circuit. The second circuit is connected to the second liquid storage tank B, the test device D, and the first liquid storage tank A, respectively. The liquid in the second liquid storage tank B can flow into the test device D and the first liquid storage tank A in sequence through the second circuit, so that the liquid can circulate between the first liquid storage tank A and the second liquid storage tank B.

[0036] During the experiment, gas supply device C provided gas to test device D, and liquid was supplied to test device D via first liquid tank A, second liquid tank B, the first circuit, and the second circuit, allowing the gas and liquid to mix in test device D. At the start of the experiment, liquid was injected into first liquid tank A. The liquid in first liquid tank A flowed into test device D via the first circuit. After entering test device D, the liquid mixed and reacted with the gas, and the liquid in test device D flowed into second liquid tank B via the first circuit. During this process, the liquid level in first liquid tank A decreased, while the liquid level in second liquid tank B increased. When the liquid level in first liquid tank A dropped to a predetermined depth, liquid from second liquid tank B flowed into test device D via the second circuit. After entering test device D, the liquid mixed and reacted with the gas, and the liquid in test device D flowed into first liquid tank A via the second circuit. During this process, the liquid level in second liquid tank B increased, while the liquid level in first liquid tank A decreased. The first and second circuits circulated the liquid between first liquid tank A and second liquid tank B, with the circulation path passing through test device D, allowing the liquid and gas to mix. This test system achieves gas-liquid two-phase mixing without requiring a cryogenic liquid circulation pump, and the liquid can be recycled between the first liquid storage tank A and the second liquid storage tank B. This solves the technical problem of liquids that remain valuable after only a single test and cannot be reused, thereby reducing testing costs and resolving liquid discharge issues. Furthermore, the flow range of cryogenic liquid circulation pumps is limited, making it impossible to achieve high-flow testing conditions. This test system achieves gas-liquid two-phase mixing without requiring a cryogenic liquid circulation pump, reducing testing costs and avoiding limitations on the liquid flow range.

[0037] Specifically, the first liquid storage tank A and the second liquid storage tank B are high vacuum multi-layer insulated storage tanks. The preservation function of the vacuum multi-layer insulated storage tank on the cryogenic fluid makes the test time more flexible, and the recycling and reuse of the fluid after each mixing saves the consumption of cryogenic fluid and reduces the cost of each test. More specifically, the first liquid storage tank A and the second liquid storage tank B have the same structure. The first liquid storage tank A and the second liquid storage tank B alternately serve as high-pressure liquid supply tanks and low-pressure liquid receiving tanks, playing the role of providing and preserving liquid. Furthermore, the liquid in the first liquid storage tank A and the second liquid storage tank B can be, but is not limited to, liquid nitrogen, liquid oxygen, liquid methane or other cryogenic fluids. In this test, the liquid is a cryogenic liquid, and the device through which the liquid passes is preferably a low-temperature resistant device. The material of the first circuit and the material of the second circuit are both insulating materials, for example, polyurethane foam insulation material, and the interior of the first circuit and the interior of the second circuit are in a vacuum state.

[0038] Specifically, the test system also includes a first boosting mechanism, which is connected to the first liquid storage tank A. The first boosting mechanism is used to increase the air pressure in the first liquid storage tank A so that the liquid in the first liquid storage tank A flows into the test device D and the second liquid storage tank B in sequence through the first circuit.

[0039] More specifically, the test system includes a second boosting mechanism, which is connected to the second liquid storage tank B. The second boosting mechanism is used to increase the air pressure in the second liquid storage tank B so that the liquid in the second liquid storage tank B flows into the test device D and the first liquid storage tank A in sequence through the second circuit.

[0040] Furthermore, the test system also includes a first pressure reducing mechanism, which is connected to the first liquid storage tank A. The first pressure reducing mechanism is used to reduce the air pressure in the first liquid storage tank A so that the liquid in the second liquid storage tank B flows into the test device D and the first liquid storage tank A in sequence through the second circuit.

[0041] Furthermore, the test system also includes a second pressure reducing mechanism, which is connected to the second liquid storage tank B. The second pressure reducing mechanism is used to reduce the air pressure in the second liquid storage tank B so that the liquid in the first liquid storage tank A can flow into the test device D and the second liquid storage tank B in sequence through the second circuit.

[0042] At the start of the test, liquid is injected into the first liquid storage tank A. The first pressurizing mechanism and the second pressure reducing mechanism are activated, increasing the pressure in the first liquid storage tank A and decreasing the pressure in the second liquid storage tank B. This results in the pressure in the first liquid storage tank A being higher than that in the second liquid storage tank B. The liquid in the first liquid storage tank A can flow from the first liquid storage tank A to the test device D and the second liquid storage tank B sequentially through the first circuit. When the liquid in the first liquid storage tank A drops to a preset depth, the first pressurizing mechanism and the second pressure reducing mechanism are closed, and the second pressurizing mechanism and the first pressure reducing mechanism are activated. This increases the pressure in the second liquid storage tank B to a higher level than that in the first liquid storage tank A. This allows the liquid in the second liquid storage tank B to flow from the second liquid storage tank B to the test device D and the first liquid storage tank A sequentially through the second circuit. In the prior art, the tank truck's operation is unstable, and the pressure and flow of the incoming liquid cannot be controlled. In this test system, the pressure and flow of the liquid can be controlled by the first pressurizing mechanism, the second pressurizing mechanism, the first pressure reducing mechanism, and the second pressure reducing mechanism.

[0043] In some embodiments, the first pressurizing mechanism includes a first vaporizer A12 and a first pressurizing opening valve A14. One end of the first vaporizer A12 is connected to the first liquid storage tank A, and the other end is connected to the first pressurizing opening valve A14. The end of the first pressurizing opening valve A14, distal from the first vaporizer A12, is connected to the first liquid storage tank A. Preferably, the first pressurizing opening valve A14 is a cryogenic valve. More preferably, the first vaporizer A12 is an external vaporizer.

[0044] Furthermore, the second pressurization mechanism includes a second vaporizer B12 and a second pressurization opening valve B14. One end of the second vaporizer B12 is connected to the second liquid storage tank B, and the other end is connected to the second pressurization opening valve B14. The end of the second pressurization opening valve B14, which is remote from the second vaporizer B12, is also connected to the second liquid storage tank B. The second pressurization opening valve B14 is a low-temperature valve. The second vaporizer B12 is an external vaporizer.

[0045] Furthermore, the first pressure reducing mechanism is a first relief valve A4, and the second pressure reducing mechanism is a second relief valve B4. Specifically, the first relief valve A4 and the second relief valve B4 are low-temperature valves.

[0046] In some embodiments, the test system also includes a first liquid level detection device and a second liquid level detection device. The first liquid level detection device is connected to the first liquid storage tank A, and the first liquid level detection device is used to detect the liquid level of the liquid in the first liquid storage tank A. The second liquid level detection device is connected to the second liquid storage tank B, and the second liquid level detection device is used to detect the liquid level of the liquid in the second liquid storage tank B.

[0047] Specifically, the first liquid level detection device includes a first liquid level gauge A7, a first liquid level gauge gas phase valve A8, a first liquid level gauge balancing valve A9, and a first liquid level gauge liquid phase valve A10. The first liquid level gauge gas phase valve A8 is drawn from the top of the first liquid storage tank A, and the first liquid level gauge balancing valve A9 and the first liquid level gauge liquid phase valve A10 are located at the bottom of the first liquid storage tank A. The first liquid level gauge balancing valve A9 is connected in parallel with the first liquid level gauge A7, and a first pressure gauge A6 is installed between the first liquid level gauge gas phase valve A8 and the first liquid level gauge balancing valve A9. The first liquid level gauge gas phase valve A8, the first liquid level gauge balancing valve A9, and the first liquid level gauge liquid phase valve A10 are cryogenic valves. The first liquid level gauge A7 is a differential pressure level gauge.

[0048] More specifically, the second liquid level detection device includes a second liquid level gauge B7, a second liquid level gauge gas phase valve B8, a second liquid level gauge balancing valve B9, and a second liquid level gauge liquid phase valve B10. The second liquid level gauge balancing valve B9 and the second liquid level gauge liquid phase valve B10 are disposed at the bottom of the second liquid storage tank B. The second liquid level gauge balancing valve B9 is connected in parallel with the second liquid level gauge B7. A second pressure gauge B6 is disposed between the second liquid level gauge gas phase valve B8 and the second liquid level gauge balancing valve B9. Preferably, the second liquid level gauge gas phase valve B8, the second liquid level gauge balancing valve B9, and the second liquid level gauge liquid phase valve B10 are cryogenic valves. More preferably, the second liquid level gauge B7 is a differential pressure level gauge.

[0049] Furthermore, a first filling valve A1 is installed at the bottom of the first liquid storage tank A, and a second filling valve A2 is installed at the top of the first liquid storage tank A. External liquid is injected into the first liquid storage tank A through the first and second filling valves A1 and A2. The first filling valve A1 is connected to the first boost opening valve A14, the first vaporizer A12, the first safety valve A20, the first pressure regulating valve A16, the first boost return valve A11, and the second filling valve A2 through pipelines. Furthermore, the first filling valve A1, the second filling valve A2, and the first pressure regulating valve A16 are cryogenic valves. The first safety valve A20 is a cryogenic safety valve.

[0050] In some embodiments, the first pressure relief mechanism is connected to a first three-way valve A15. One end of the first three-way valve A15 is connected to a first bursting disc A21 and a second safety valve A23. The other end of the first three-way valve A15 is connected to a second bursting disc A22 and a third safety valve A24. A first vacuum gauge A26 is installed at the top of the first liquid storage tank A and is connected in series with the first liquid storage tank A via the first vacuum valve A5. Specifically, the second and third safety valves A23 and A24 are cryogenically resistant safety valves.

[0051] Furthermore, a third filling valve B1 is provided at the bottom of the second liquid storage tank B, and a fourth filling valve B2 is provided at the top of the second liquid storage tank B. External liquid is injected into the second liquid storage tank B through the third filling valve B1 and the fourth filling valve B2. The third filling valve B1 is connected to the second boost opening valve B14, the second vaporizer B12, the fourth safety valve B20, the second pressure regulating valve B16, the second boost return valve B11, and the fourth filling valve B2 in sequence.

[0052] Furthermore, the first pressure-reducing mechanism is connected to a second three-way valve B15. One end of the second three-way valve B15 is connected to a third bursting disc B21 and a fifth safety valve B23. The other end of the second three-way valve B15 is connected to a fourth bursting disc B22 and a sixth safety valve B24. A second vacuum gauge B26 is installed at the top of the second liquid storage tank B and is connected in series with the second liquid storage tank B via the second vacuum valve B5.

[0053] Specifically, the first circuit includes a first pipeline 11 and a second pipeline 12. One end of the first pipeline 11 is connected to the first liquid storage tank A, and the other end of the first pipeline 11 is connected to the test device D. One end of the second pipeline 12 is connected to the test device D, and the other end of the second pipeline 12 is connected to the second liquid storage tank B. The first pipeline 11 is provided with a first stop valve A13, and the first stop valve A13 is used to control the cutoff and circulation of the liquid in the first pipeline 11. The second pipeline 12 is provided with a second stop valve D24, and the second stop valve D24 is used to control the cutoff and circulation of the liquid in the second pipeline 12.

[0054] More specifically, the first pipeline 11 is equipped with a filter D3 and a first exhaust valve A3. Filter D3 is used to filter solid impurities. Filter D3 is a cryogenic fluid filter D3. Also installed in the first pipeline 11 are a first cryogenic mass flowmeter D4, a seventh safety valve D5, and a first pressure reducing valve D1. The second pipeline 12 is equipped with an eighth safety valve D20, a second exhaust valve D23, and a second regulating valve D9. The second regulating valve D9 controls the flow of liquid.

[0055] Furthermore, the second circuit includes a fourth pipeline 14 and a fifth pipeline, one end of the fourth pipeline 14 is connected to the second liquid storage tank B, the other end of the fourth pipeline 14 is connected to the test device D, one end of the fifth pipeline is connected to the test device D, and the other end of the fifth pipeline is connected to the first liquid storage tank A, the fourth pipeline 14 is provided with a fourth stop valve B13, the fourth stop valve B13 is used to control the cutoff and circulation of the liquid in the fourth pipeline 14, and the fifth pipeline is provided with a fifth stop valve, the fifth stop valve is used to control the cutoff and circulation of the liquid in the fifth pipeline.

[0056] Furthermore, the fourth pipeline 14 is equipped with a filter D3 and a third exhaust valve B27. Filter D3 is used to filter solid impurities. Filter D3 is a cryogenic fluid filter D3. Also installed in the fourth pipeline 14 are a second cryogenic mass flowmeter, a ninth safety valve, and a fourth pressure reducing valve. The fifth pipeline is equipped with a tenth safety valve, a fourth exhaust valve, and a second regulating valve D9, which controls the flow of liquid.

[0057] In some embodiments, the test device D includes an injection section D15, a mixing section D16, and a visualization section D17. The injection section D15 and the mixing section D16 are connected by a flange D19, and the mixing section D16 and the visualization section D17 are connected by a flange D19. A first temperature and pressure sensor D6 is provided between the seventh safety valve D5 and the injection section D15. The first temperature sensor is used to measure the temperature and pressure of the liquid between the seventh safety valve D5 and the injection section D15. The injection section D15 is provided with a second temperature and pressure sensor D14, which is used to measure the temperature and pressure of the gas within the injection section. The mixing section D16 is provided with a third temperature and pressure sensor D17, which is used to measure the temperature and pressure of the gas and liquid within the mixing section D16. The injection section D15 is a double-layer structure with an inner diameter identical to that of the connected first pipe 11 and is provided with small holes of varying numbers, diameters, shapes, and orientations. By changing the size, number, shape, position, and arrangement of the gas injection holes in the gas injection section D15, the mechanism of direct contact condensation can be studied under different structures. The visible section is a double-layer vacuum-insulated structure fastened by bolts. The visible section is made of glass, through which the flow and condensation within the visible section can be observed. The mixing section D16 is available in different lengths to facilitate adjustment of the visible section position and facilitate observation of condensation throughout the flow cycle.

[0058] More specifically, the test system also includes a heater D11 and a second regulating valve D9. Both the second regulating valve D9 and heater D11 are located within the third pipe 13. Heater D11 heats the gas within the third pipe 13, while the second regulating valve D9 controls the gas flow. Heater D11 is a gas heater with or without a built-in resistance wire. Adjusting the power of heater D11 changes the gas temperature. Adjusting the power meter of heater D11 can achieve a controllable gas-liquid temperature difference.

[0059] Specifically, the gas supply device is connected to the first liquid storage tank and the second liquid storage tank respectively. The gas supply device can provide gas to the first liquid storage tank to increase the pressure in the first liquid storage tank, and the gas supply device can provide gas to the second liquid storage tank to increase the pressure in the second liquid storage tank.

[0060] The gas supply device C can be a high-pressure gas cylinder assembly, consisting of multiple high-pressure gas cylinders integrated via a container or busbar. This assembly can also supplement the pressure in the first and second liquid storage tanks A and B when the pressure is insufficient. The test system also includes a third pipeline 13 and a third shut-off valve D8. One end of the third pipeline 13 is connected to the gas supply device C, and the other end is connected to the test device D. The third shut-off valve D8 is disposed within the third pipeline 13 and controls the flow and shut-off of gas within the third pipeline 13.

[0061] Furthermore, the third pipeline 13 is provided with a second pressure reducing valve C1 , a sixth stop valve D12 and a gas flow meter D10 . The second pressure reducing valve C1 is used to reduce the gas pressure in the third pipeline 13 .

[0062] More specifically, the test system also includes a sixth pipeline 15, one end of which is connected to the air supply device C, and the other end is connected to the first liquid storage tank A and the second liquid storage tank B respectively. The sixth pipeline 15 is provided with a third pressure reducing valve C2 and a third pressure gauge C3.

[0063] Working process:

[0064] The first liquid storage tank A and the second liquid storage tank B are used alternately as high-pressure liquid supply tanks. Taking the first liquid storage tank A as the high-pressure liquid supply tank and the second liquid storage tank B as the low-pressure receiving tank as an example, open the first overflow valve A4, and liquid nitrogen is injected into the first liquid storage tank A from the tank truck through the first filling valve A1 at the bottom of the first liquid storage tank A. After the filling is completed, close the first overflow valve A4 and the first filling valve A1, open the first boost opening valve A14, and boost the pressure of the first liquid storage tank A. After the pressure is boosted to the required pressure, open the first stop valve A13, and the liquid nitrogen flows into the first liquid storage tank A from the first stop valve A13. The liquid nitrogen passes through the filter D3 and the cryogenic mass flowmeter in the first pipeline 11. D4, the seventh safety valve D5, the first pressure reducing valve D1, the gas injection section D15, the mixing section D16, the visualization section D17, and the second stop valve D24 before flowing into the second liquid storage tank B. When the second liquid storage tank B is the receiving tank, the second overflow valve B4 is maintained. If the gas pressure in the first liquid storage tank A is insufficient, the high-pressure gas cylinder group can be opened to pressurize the first liquid storage tank A. The gas supply device C provides gas, and the gas passes through the heater D11, the second regulating valve D9, the second pressure reducing valve C1, the sixth stop valve D12 and the gas flowmeter D10 before entering the gas injection section D15. Under the action of the pressure difference, the gas is injected into the pipe through the small holes on the inner wall of the gas injection section D15 to be mixed with liquid nitrogen.

[0065] When the liquid nitrogen level in the first liquid storage tank A drops to a preset depth, the first pressure-increasing valve A14 is closed to stop pressurizing the first liquid storage tank A. The first stop valve A13 is closed to stop the transfer of liquid nitrogen from the first liquid storage tank A to the second liquid storage tank B. The first exhaust valve A3 and the second exhaust valve D23 are opened to exhaust and relieve the pressure in the first pipeline 11 and the second pipeline 12 to prevent excessive pressure in the first pipeline 11 and the second pipeline 12. The first overflow valve A4, the second vaporizer B12, and the second pressure-increasing valve B14 are opened to pressurize the second liquid storage tank B. After the pressure in the second liquid storage tank B increases to the required pressure, the first exhaust valve A3 and the second exhaust valve D23 are closed, and the second stop valve D24 is opened, allowing the liquid nitrogen in the second liquid storage tank B to enter the test device D through the fourth pipeline 14 and then enter the first liquid storage tank A through the fifth pipeline. During this process, the first liquid storage tank A serves as a low-pressure receiving tank and the second liquid storage tank B serves as a high-pressure supply tank.

[0066] After the test, each device needs to be checked to prevent the low-temperature system from being too high. Close the first pressure relief valve, the second vaporizer B12 and the second boost opening valve B14 to stop the liquid supply. Open the third exhaust valve B27 and the fourth exhaust valve to exhaust and relieve the pressure in the third pipeline 13 and the fourth pipeline 14 to prevent the pressure in the third pipeline 13 and the fourth pipeline 14 from being too high.

[0067] The test device D does not need to use a tank truck to directly supply liquid. The pressurized liquid supply through the first liquid storage tank A and the second liquid storage tank B is more stable and reliable, and the low-temperature fluid obtained by emptying and then pressurizing has a higher subcooling degree.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A low-temperature circulation test system for gas-liquid two-phase flow mixing, characterized in that: include: First liquid storage tank; Second liquid storage tank; Test equipment; a gas supply device connected to the test device and configured to supply gas to the test device; a first circuit, wherein the first circuit is connected to the first liquid storage tank, the test device, and the second liquid storage tank, respectively, so that the liquid in the first liquid storage tank can flow into the test device and the second liquid storage tank in sequence through the first circuit; and a second circuit, the second circuit being connected to the second liquid storage tank, the test device, and the first liquid storage tank, respectively, so that the liquid in the second liquid storage tank can flow into the test device and the first liquid storage tank in sequence through the second circuit, so that the liquid can circulate between the first liquid storage tank and the second liquid storage tank; The test system further includes a first pressurizing mechanism connected to the first liquid storage tank, the first pressurizing mechanism being configured to increase the air pressure in the first liquid storage tank so that the liquid in the first liquid storage tank flows sequentially into the test device and the second liquid storage tank through the first circuit; The first boost mechanism includes a first vaporizer and a first boost opening valve, one end of the first vaporizer is connected to the first liquid storage tank, and the other end is connected to the first boost opening valve, and the end of the first boost opening valve away from the first vaporizer is connected to the first liquid storage tank; The test system includes a second pressurizing mechanism connected to the second liquid storage tank, the second pressurizing mechanism being used to increase the air pressure in the second liquid storage tank so that the liquid in the second liquid storage tank flows into the test device and the first liquid storage tank in sequence through the second circuit; The test system further includes a first pressure reducing mechanism connected to the first liquid storage tank, the first pressure reducing mechanism being configured to reduce the air pressure in the first liquid storage tank so that the liquid in the second liquid storage tank flows sequentially into the test device and the first liquid storage tank through the second circuit; The test device includes an air injection section, a mixing section and a visualization section. The air injection section is flange-connected to the mixing section, and the mixing section is flange-connected to the visualization section. The visualization section is made of glass, and the flow condensation in the visualization section is observed through the glass material.

2. The test system according to claim 1, characterized in that The first circuit includes a first pipeline and a second pipeline, one end of the first pipeline is connected to the first liquid storage tank, and the other end of the first pipeline is connected to the test device, one end of the second pipeline is connected to the test device, and the other end of the second pipeline is connected to the second liquid storage tank, the first pipeline is provided with a first stop valve, and the second pipeline is provided with a second stop valve.

3. The test system according to claim 1, characterized in that The gas supply device is connected to the first liquid storage tank, and the gas supply device can provide gas to the first liquid storage tank to increase the pressure in the first liquid storage tank; or The gas supply device is connected to the second liquid storage tank, and the gas supply device can provide gas to the second liquid storage tank to increase the pressure in the second liquid storage tank.

4. The test system according to claim 1, characterized in that The test system also includes a third pipeline and a third stop valve. One end of the third pipeline is connected to the gas supply device, and the other end is connected to the test device. The third stop valve is arranged in the third pipeline, and the third stop valve is used to control the cutoff and flow of gas in the third pipeline.

5. The test system according to claim 4, characterized in that: The test system further includes a heater, which is disposed in the third pipe and is used to heat the gas in the third pipe.

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