Device for testing low-temperature medium heat exchange equipment and recovering medium and testing method

Abstract

The invention discloses a low-temperature medium heat exchange equipment testing and medium recycling device and a testing method. Comprising a medium storage system, a heat exchanger test loop, a medium recovery loop, a host regulating valve and a host system, the medium storage system comprises a liquefied medium storage tank and a low-temperature gas medium storage tank; an outlet of the liquefied medium storage tank is connected with an inlet of the heat exchanger testing loop, a first outlet of the heat exchanger testing loop is connected with an inlet of the low-temperature gas medium storage tank, and a second outlet of the heat exchanger testing loop is connected with an inlet of the medium recycling loop and then connected with the host system through a host adjusting valve. The liquid phase outlet is connected with the inlet of the liquefied medium storage tank. The working condition of the testing device is controlled through the heat exchange testing delivery pump and the valve system, real-time monitoring is conducted through multiple sensors, the function of providing a specific temperature medium for a host system is achieved, and the equipment performance can be tested under different low-temperature media.

Description

Technical Field

[0001] The invention patent belongs to the field of energy and power, and specifically relates to a device and a testing method for testing low-temperature medium heat exchange equipment and medium recovery. Background Art

[0002] As global fossil fuel resources gradually decrease and climate change becomes increasingly serious, the development and utilization of clean energy has become crucial. In particular, the application of cryogenic media such as liquid nitrogen and liquefied natural gas has a significant effect on reducing greenhouse gas emissions and improving air quality. However, the low temperature requirements of these cryogenic fuels may make conventional materials brittle and easy to break, increasing safety risks. In addition, any leakage may cause severe frostbite or explosion. In order to safely store and effectively use cryogenic fuels, there are also major technical challenges.

[0003] Although there are many cryogenic medium testing systems on the market, most of them are insufficient in equipment performance testing and energy recovery. For example, the testing and actual operation of most equipment are carried out separately, which may lead to problems in actual operation that were not foreseen due to insufficient testing. Some countries have developed test devices that can simulate and test the actual application status of cryogenic media, which has greatly promoted the development and application of cryogenic technology. In contrast, there is still a lack of systematic and efficient testing facilities in this field in China, which restricts the progress of local cryogenic technology. Summary of the invention

[0004] The object of the present invention is to provide a device and a method for testing low-temperature medium heat exchange equipment and recovering the medium.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A device for testing low-temperature medium heat exchange equipment and recovering medium, comprising a medium storage system, a heat exchanger test loop, a medium recovery loop, a host regulating valve and a host system; the medium storage system comprises a liquefied medium storage tank and a low-temperature gas medium storage tank;

[0007] The outlet of the liquefied medium storage tank is connected to the inlet of the heat exchanger test loop, the first outlet of the heat exchanger test loop is connected to the inlet of the low-temperature gas medium storage tank, the second outlet of the heat exchanger test loop is first connected to the inlet of the medium recovery loop, and then connected to the host system through the host regulating valve, the gas phase outlet of the medium recovery loop is connected to the inlet of the low-temperature gas medium storage tank, and the liquid phase outlet of the medium recovery loop is connected to the inlet of the liquefied medium storage tank;

[0008] The heat exchanger test loop is used to heat the gas supply medium leading to the host system and to perform equipment testing on the equipment on the loop;

[0009] The medium recovery loop is used for reliquefying and recovering the test medium that has been subjected to equipment testing.

[0010] Furthermore, the heat exchanger test loop is sequentially arranged with a heat exchange test regulating valve, a heat exchange test delivery pump, a forced vaporizer system and a first gas-liquid separator along the medium flow direction; the liquid phase outlet of the first gas-liquid separator is sequentially connected to a heat exchange liquid phase regulating valve, a low-temperature medium heater and a low-temperature medium regulating valve, and the outlet of the low-temperature medium regulating valve serves as the first outlet of the heat exchange test loop; the gas phase outlet of the first gas-liquid separator is connected to a low-load heater system through a heat exchange gas phase regulating valve, and the outlet of the low-load heater system serves as the second outlet of the heat exchange test loop; the heat exchanger test loop performs equipment testing on the forced vaporizer system and the low-load heater system.

[0011] Furthermore, the medium recovery loop is sequentially arranged with a medium recovery regulating valve, a recovery and reliquefaction device and a second gas-liquid separator along the medium flow direction; the gas phase outlet of the second gas-liquid separator is sequentially connected to the reliquefaction gas phase regulating valve, the air temperature heater and the air temperature heating regulating valve, and the outlet of the air temperature heating regulating valve serves as the gas phase outlet of the medium recovery loop; the liquid phase outlet of the second gas-liquid separator is connected to the inlet of the reliquefaction liquid phase regulating valve, and the outlet of the reliquefaction liquid phase regulating valve serves as the liquid phase outlet of the medium recovery loop; the medium recovery loop is used for reliquefaction and recovery of test medium flowing through the forced gasifier system and the low-load heater system for equipment testing.

[0012] Furthermore, the forced gasifier system is arranged with a fixed gasification circuit and a test gasification circuit; the inlets of the fixed gasification circuit and the test gasification circuit are connected to the outlet of the heat exchange test delivery pump, and the outlets of the fixed gasification circuit and the test gasification circuit are connected to the inlet of the first gas-liquid separator; the fixed gasification circuit is sequentially arranged with a fixed gasification regulating valve, a fixed forced gasifier, a fixed spray short pipe and a fixed gasification stop valve along the medium flow direction; the test gasification circuit is sequentially arranged with a test gasification regulating valve, a test forced gasifier, a test spray short pipe and a test gasification stop valve along the medium flow direction.

[0013] Furthermore, the outlets of the fixed gasification stop valve and the test gasification regulating valve are both arranged with two branches, one leading directly to the forced gasifier, and the other entering the spray short pipe through the spray regulating valve.

[0014] Furthermore, the low-load heater system includes a fixed heating circuit and a test heating circuit, the inlets of the fixed heating circuit and the test heating circuit are connected to the outlet of the heat exchange gas phase regulating valve, and the outlets of the fixed gasification circuit and the test gasification circuit are connected to the inlet of the medium recovery circuit and the inlet of the main engine regulating valve in sequence; the fixed heating circuit is provided with a fixed low-load heating regulating valve, a fixed low-load heater and a fixed low-load heating stop valve along the medium flow direction; the test heating circuit is provided with a test low-load heating regulating valve, a test low-load heater and a test low-load heating stop valve along the medium flow direction.

[0015] Furthermore, the device is arranged with multiple sensors for real-time monitoring and control of medium flow. Temperature and pressure sensors are arranged at the inlet of the forced vaporizer system and the low-load heater system to control the heat exchange load of the heat exchange equipment by monitoring the medium parameters at the inlet of the heat exchange equipment; temperature, pressure and flow sensors are arranged at the outlet of the forced vaporizer system and the low-load heater system to detect the heat exchange performance of the heat exchange equipment; at the same time, the temperature, pressure and flow sensors arranged at the inlet of the low-load heater system can also control the opening of the spray regulating valve and adjust the spray flow; temperature and liquid level sensors are arranged in the middle of the first gas-liquid separator and the second gas-liquid separator to monitor the internal temperature of the gas-liquid separator and control the opening and closing of the valve.

[0016] A device and method for testing low-temperature medium heat exchange equipment and medium recovery, as follows:

[0017] The test medium for the constant temperature gas supply and equipment test of the device is a low temperature gas fuel, including but not limited to nitrogen, hydrogen, and natural gas; after the heat exchange test delivery pump is turned on, the test device includes three working states: constant temperature gas supply, forced gasifier test, and low load heater test, and the working state of the test device is controlled by opening and closing the control valve;

[0018] When the test device enters the "constant temperature gas supply" working state, the fixed gasification regulating valve, fixed gasification stop valve, fixed low-load heating regulating valve, fixed low-load heating stop valve and main engine regulating valve are opened, and medium flows in the heat exchanger test loop and flows to the main engine system. At this time, the test device is used to provide the main engine system with a gas fuel medium of 10-50 degrees Celsius;

[0019] When the test device enters the "forced gasifier test" working state, the test gasification regulating valve, the test gasification stop valve, the fixed low-load heating regulating valve, the fixed low-load heating stop valve and the medium recovery regulating valve are opened, and medium flows in both the heat exchanger test circuit and the medium recovery circuit. At this time, the test device is used to perform equipment testing on the test forced gasifier;

[0020] When the test device enters the "low load heater test" working state, the fixed gasification regulating valve, fixed gasification stop valve, test low load heating regulating valve, test low load heating stop valve and medium recovery regulating valve are opened, and medium flows in both the heat exchanger test loop and the medium recovery loop. At this time, the test device is used to perform equipment testing on the test low load heater.

[0021] Furthermore, after the device enters the working state, in order to prevent the medium in the working circuit from entering the non-working circuit, the main engine regulating valve and the medium recovery regulating valve cannot be opened at the same time, the low-temperature medium regulating valve and the air temperature heating regulating valve cannot be opened at the same time, the fixed gasification regulating valve and the test gasification regulating valve cannot be opened at the same time, the fixed gasification stop valve and the test gasification stop valve cannot be opened at the same time, the fixed low-load heating regulating valve and the test low-load heating regulating valve cannot be opened at the same time, and the fixed low-load heating stop valve and the test low-load heating stop valve cannot be opened at the same time.

[0022] Furthermore, the test working fluid used by the test device for constant temperature gas supply and equipment testing is low-temperature gas fuel, including but not limited to nitrogen, hydrogen, and natural gas.

[0023] The beneficial effects of the present invention are:

[0024] 1. The patent of this invention is applicable to different cryogenic media, including but not limited to nitrogen, hydrogen, natural gas and other gaseous fuels;

[0025] 2. By installing temperature, pressure and flow sensors at key locations, the characteristic parameters of the medium can be accurately monitored and controlled, which not only improves the accuracy of the test but also ensures the safety of the system during operation;

[0026] 3. The present invention sets up a medium recovery loop, which is reused through the reliquefaction process, thereby reducing energy waste;

[0027] 4. In the test loop set up by the present invention, a test equipment loop and a test equipment loop are set up to ensure that when a single device is not tested, other devices can still be tested. Through in-depth research on these devices, it is helpful to identify and solve potential problems at an early stage, ensure that the manufacturing quality of these devices meets strict standards, thereby reducing the failure rate and enhancing the overall reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a structure of a device and a testing method for testing low-temperature medium heat exchange equipment and medium recovery;

[0029] Figure 2 is a schematic structural diagram of the forced gasifier system of the present invention;

[0030] Figure 3It is a structural schematic diagram of the low-load heater system described in the present invention;

[0031] Figure 4 It is a schematic structural diagram of the second gas-liquid separator in the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings.

[0033] The present invention proposes a device and a method for testing low-temperature medium heat exchange equipment and medium recovery, aiming to comprehensively test and verify various performances of a low-temperature medium gas supply system, improve product quality, extend equipment service life, and reduce maintenance costs.

[0034] Combination Figure 1 The present invention discloses a device for testing low-temperature medium heat exchange equipment and recovering medium, including a medium storage system, a heat exchange test delivery pump 18, a recovery and reliquefaction device 19, a valve system, a heat exchange system, a separation system, a sensor system and a host system. The components in the system are connected by pipelines to form the test device of the present invention, and are divided into a heat exchanger test loop a and a medium recovery loop b.

[0035] The medium storage system includes a liquefied medium storage tank 1 and a low-temperature gas medium storage tank 2. The valve system includes a heat exchange test regulating valve 3, a heat exchange gas phase regulating valve 4, a heat exchange liquid phase regulating valve 5, a main engine regulating valve 6, a medium recovery regulating valve 7, a reliquefied gas phase regulating valve 8, a reliquefied liquid phase regulating valve 9, a low-temperature medium regulating valve 10 and an air temperature heating regulating valve 11. The heat exchange system includes a forced vaporizer system 12, a low-load heater system 13, a low-temperature medium heater 14 and an air temperature heater 15. The separation system includes a first gas-liquid separator 16 and a second gas-liquid separator 17.

[0036] The outlet of the liquefied medium storage tank 1 is connected to the inlet of the heat exchanger test loop a, the first outlet of the heat exchanger test loop a is connected to the inlet of the low-temperature gas medium storage tank 2, the second outlet of the heat exchanger test loop a is connected to the main engine regulating valve 6 and the inlet of the medium recovery loop b, the outlet of the main engine regulating valve 6 is connected to the inlet of the main engine system, the gas phase outlet of the medium recovery loop b is connected to the inlet of the low-temperature gas medium storage tank 2, and the liquid phase outlet of the medium recovery loop b is connected to the inlet of the liquefied medium storage tank 1.

[0037] Specifically, the specific working process of each circuit of the present invention is as follows:

[0038] The heat exchange test regulating valve 3 is opened, the heat exchange test delivery pump 18 enters the working state, and the liquid medium in the liquefied medium storage tank 1 enters the heat exchange test loop a. In the heat exchange test loop a, the temperature and pressure sensors arranged at the inlet of the forced vaporizer system 12 monitor the working medium state, and control the heat exchange load of the forced vaporizer accordingly. Then the liquid medium enters the forced vaporizer system 12 for gasification heat exchange. The vaporized medium may not be completely liquefied, so the subsequent first gas-liquid separator 16 is responsible for separating the vaporized mixture into independent gas phase and liquid phase. The liquid phase part enters the low-temperature medium heater 14 through the heat exchange liquid phase regulating valve 5. In the low-temperature medium heater 14, the liquid phase medium is heated to the tank temperature of the low-temperature gas medium storage tank 2, and then enters the low-temperature gas medium storage tank 2 through the low-temperature medium regulating valve 10; the gas phase part enters the low-load heater system 13 through the heat exchange gas phase regulating valve 4 for further heating to the gas supply temperature, and then enters the host system through the host regulating valve 6 or enters the medium recovery loop b to recycle the test medium;

[0039] The function of the medium recovery loop b is to reliquefy the test medium through the recovery and reliquefaction device 19, and store the liquefied medium in the liquefied medium storage tank 1 and the low-temperature gas medium storage tank 2. The test medium enters the recovery and reliquefaction device 19 through the medium recovery regulating valve 7, and the test medium is cooled and liquefied again in the recovery and reliquefaction device 19. In order to avoid the unliquefied test medium entering the liquefied medium storage tank 1, which causes the pressure and temperature of the liquefied medium storage tank 1 to increase, the cooled and liquefied medium first passes through the second gas-liquid separator 17 to separate a very small amount of unliquefied test medium, and then passes through the reliquefaction gas phase regulating valve 8 to enter the air temperature heater 15, and is heated to the tank temperature of the low-temperature gas medium storage tank 2, and finally enters the low-temperature gas medium storage tank 2 for storage, and other large amounts of liquid medium enter the liquefied medium storage tank 1 through the reliquefaction liquid phase regulating valve 9.

[0040] Combination Figure 2 There are two routes for the medium in the forced gasifier system 12, including a fixed gasification loop 12-a and a test gasification loop 12-b. Specifically: when the fixed gasification loop 12-a enters the working state, the fixed gasification regulating valve 12-1 and the fixed gasification stop valve 12-2 are opened, and the medium enters the fixed forced gasifier through the fixed gasification regulating valve 12-1 for gasification and heating to a specific temperature, and flows into the first gas-liquid separator 16 through the fixed spray short pipe 12-3 and the fixed gasification stop valve 12-2; when the test gasification loop 12-b enters the working state, the test gasification regulating valve 12-4 and the test gasification stop valve 12-5 are opened, and the medium enters the test forced gasifier through the test gasification regulating valve 12-4 for equipment testing, and flows into the first gas-liquid separator 16 through the test spray short pipe 12-6 and the test gasification stop valve 12-5.

[0041] After the medium enters the first gas-liquid separator 16, since the heat exchange performance of the test forced gasifier is unknown, there may be incomplete gasification. Therefore, a temperature and liquid level sensor is set in the middle of the first gas-liquid separator 16 to control the opening and closing of the heat exchange liquid phase regulating valve 5. When the test forced gasifier fails to completely liquefy the test medium, the liquid level of the first gas-liquid separator 16 rises, and the temperature and liquid level sensor controls the heat exchange liquid phase regulating valve 5 to open. The ungasified medium enters the low-temperature medium heater 14 and is heated to the tank temperature of the low-temperature gas medium storage tank 2. Then, the heat exchange gas phase regulating valve 4 is opened, the air temperature heating regulating valve 11 is closed, and the medium flows to the low-temperature gas medium storage tank 2. When the liquid level inside the first gas-liquid separator 16 is zero, the gas phase part passes through the heat exchange gas phase regulating valve 4 and enters the low-load heater system 13 for further heating.

[0042] In particular, before the medium enters the low-load heater, the operating parameters are monitored by temperature, pressure, and flow sensors, and according to the temperature requirements of the low-load heater system 13, the fixed spray regulating valve 12-7 and the test spray regulating valve 12-8 inside the forced gasifier system 12 are controlled, and the operating condition of the medium is controlled by using the spray short pipe.

[0043] Combination Figure 3 There are two routes for the medium in the low-load heater, including a fixed heating circuit 13-a and a test heating circuit 13-b. Specifically: when the fixed heating circuit 13-a enters the working state, the fixed low-load heating regulating valve 13-1 and the fixed low-load heating stop valve 13-2 are opened, and the liquid medium enters the fixed low-load heater through the fixed low-load heating regulating valve 13-1, and the medium is heated to the gas supply temperature in the fixed low-load heater, and then flows out of the low-load heater system 13 through the fixed low-load heating stop valve 13-2; when the test heating circuit 13-b enters the working state, the test low-load heating regulating valve 13-3 and the test low-load heating stop valve 13-4 are opened, and the liquid medium enters the test low-load heater through the test low-load heating regulating valve 13-3, and the medium undergoes equipment testing in the test low-load heater, and then flows out of the low-load heater system 13 through the test low-load heating stop valve 13-4.

[0044] Combination Figure 4In the medium recovery loop b, after the medium passes through the recovery and reliquefaction device 19 and enters the second gas-liquid separator 17, the second gas-liquid separator 17 monitors the working parameters of the internal medium according to the sensor and opens and closes the valve. The specific judgment logic is: when the medium enters the second gas-liquid separator 17 for gas-liquid separation, the reliquefied liquid phase regulating valve 9 is opened, and the liquid medium enters the liquefied medium storage tank 1; when the temperature and liquid level sensor set in the middle of the second gas-liquid separator 17 detects that the internal liquid level of the second gas-liquid separator 17 drops to zero, the reliquefied liquid phase regulating valve 9 is closed, the reliquefied gas phase regulating valve 8 is opened, and a small amount of unliquefied test medium enters the air temperature heater 15 through the reliquefied gas phase regulating valve 8.

[0045] The control method of the test device of the present invention is as follows:

[0046] The test device enters the "constant temperature gas supply" working state, and the valve opening and closing conditions on the test device are as follows: the heat exchange test regulating valve 3 is opened, the heat exchange test delivery pump 18 enters the working state, and the liquid medium in the liquefied medium storage tank 1 enters the heat exchange test loop a; in the forced gasifier system 12, the fixed gasification regulating valve 12-1 and the fixed gasification stop valve 12-2 are opened, the test gasification regulating valve 12-4 and the test gasification stop valve 12-5 are closed, and the medium enters the fixed gasification loop 12-a; in the low-load heater system 13, the fixed low-load heating regulating valve 13-1 and the fixed low-load heating stop valve 13-2 are opened, the test low-load heater regulating valve 13-3 and the test low-load heating stop valve 13-4 are closed, and the medium enters the fixed heating loop 13-a; the main engine regulating valve 6 is opened, the medium recovery regulating valve 7 is closed, and the medium heated to the gas supply temperature enters the gas supply system.

[0047] The test device enters the "forced vaporizer test" working state, and the valve opening and closing conditions on the test device are as follows: the heat exchange test regulating valve 3 is opened, the heat exchange test delivery pump 18 enters the working state, and the liquid medium in the liquefied medium storage tank 1 enters the heat exchange test loop a. In the forced vaporizer system 12, the fixed vaporization regulating valve 12-1 and the fixed vaporization stop valve 12-2 are closed, the test vaporization regulating valve 12-4 and the test vaporization stop valve 12-5 are opened, and the medium enters the test vaporization loop 12-b, and the medium is tested in the test forced vaporizer; in the low-load heater system 13, the fixed low-load heating regulating valve 13-1 and the fixed low-load heating stop valve 13-2 are opened, the test low-load heater regulating valve 13-3 and the test low-load heating stop valve 13-4 are closed, and the medium enters the fixed heating loop 13-a; the main engine regulating valve 6 is closed, the medium recovery regulating valve 7 is opened, and the test medium enters the medium recovery loop b.

[0048] The test device enters the "low-load heater test" working state, and the valve opening and closing conditions on the test device are as follows: the heat exchange test regulating valve 3 is opened, the heat exchange test delivery pump 18 enters the working state, and the liquid medium in the liquefied medium storage tank 1 enters the heat exchange test loop a. In the forced vaporizer system 12, the fixed vaporization regulating valve 12-1 and the fixed vaporization stop valve 12-2 are opened, the test vaporization regulating valve 12-4 and the test vaporization stop valve 12-5 are closed, and the medium enters the test vaporization loop 12-b, and the medium is heated to the inlet temperature of the test low-load heater in the fixed forced vaporizer; in the low-load heater system 13, the fixed low-load heating regulating valve 13-1 and the fixed low-load heating stop valve 13-2 are closed, the test low-load heater regulating valve 13-3 and the test low-load heating stop valve 13-4 are opened, and the medium enters the test heating loop 13-b, and the medium performs equipment testing in the test low-load heater; the main engine regulating valve 6 is closed, the medium recovery regulating valve 7 is opened, and the test medium enters the medium recovery loop b.

[0049] In the above three working states, the low-temperature medium heater 14, the air temperature heater 15, the spray short pipe and the separation system and the valves and sensors involved therein all operate normally.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for testing low-temperature medium heat exchange equipment and recovering medium, characterized in that: It comprises a medium storage system, a heat exchanger test loop, a medium recovery loop, a host regulating valve and a host system; the medium storage system comprises a liquefied medium storage tank (1) and a cryogenic gas medium storage tank (2); The outlet of the liquefied medium storage tank (1) is connected to the inlet of the heat exchanger test loop, the first outlet of the heat exchanger test loop is connected to the inlet of the low-temperature gas medium storage tank (2), the second outlet of the heat exchanger test loop is first connected to the inlet of the medium recovery loop, and then connected to the host system through the host regulating valve (6), the gas phase outlet of the medium recovery loop is connected to the inlet of the low-temperature gas medium storage tank (2), and the liquid phase outlet of the medium recovery loop is connected to the inlet of the liquefied medium storage tank (1); The heat exchanger test loop is used to heat the gas supply medium leading to the host system and to perform equipment testing on the equipment on the loop; The medium recovery loop is used for reliquefying and recovering the test medium that has been subjected to the equipment test.

2. A device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 1, characterized in that: The heat exchanger test loop is arranged in sequence along the medium flow direction with a heat exchange test regulating valve (3), a heat exchange test delivery pump (18), a forced vaporizer system (12) and a first gas-liquid separator (16); the liquid phase outlet of the first gas-liquid separator (16) is connected in sequence with a heat exchange liquid phase regulating valve (5), a low-temperature medium heater (14) and a low-temperature medium regulating valve (10), and the outlet of the low-temperature medium regulating valve (10) serves as the first outlet of the heat exchange test loop; the gas phase outlet of the first gas-liquid separator (16) is connected to a low-load heater system (13) through a heat exchange gas phase regulating valve (4), and the outlet of the low-load heater system (13) serves as the second outlet of the heat exchange test loop; the heat exchanger test loop performs equipment testing on the forced vaporizer system (12) and the low-load heater system (13).

3. The device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 1, characterized in that: The medium recovery loop is arranged in sequence along the medium flow direction with a medium recovery regulating valve (7), a recovery and reliquefaction device (19) and a second gas-liquid separator (17); the gas phase outlet of the second gas-liquid separator (17) is connected in sequence to a reliquefaction gas phase regulating valve (8), an air temperature heater (15) and an air temperature heating regulating valve (11), and the outlet of the air temperature heating regulating valve (11) serves as the gas phase outlet of the medium recovery loop; the liquid phase outlet of the second gas-liquid separator (17) is connected to an inlet of a reliquefaction liquid phase regulating valve (9), and the outlet of the reliquefaction liquid phase regulating valve (9) serves as the liquid phase outlet of the medium recovery loop; the medium recovery loop is used for reliquefaction recovery of the test medium flowing through the forced gasifier system (12) and the low-load heater system (13) for equipment testing.

4. The device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 2, characterized in that: The forced gasifier system (12) is provided with a fixed gasification circuit and a test gasification circuit; the inlets of the fixed gasification circuit and the test gasification circuit are connected to the outlet of the heat exchange test delivery pump (18), and the outlets of the fixed gasification circuit and the test gasification circuit are connected to the inlet of the first gas-liquid separator (16); the fixed gasification circuit is provided with a fixed gasification regulating valve (12-1), a fixed forced gasifier, a fixed spray short pipe (12-2) and a fixed gasification stop valve (12-3) in sequence along the flow direction of the medium; the test gasification circuit is provided with a test gasification regulating valve (12-4), a test forced gasifier, a test spray short pipe (12-6) and a test gasification stop valve (12-5) in sequence along the flow direction of the medium.

5. The device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 4, characterized in that: The outlets of the fixed gasification stop valve (12-3) and the test gasification regulating valve (12-4) are both arranged with two branches, one leading directly to the forced gasifier, and the other entering the spray short pipe (12-3, 12-6) through the spray regulating valve (12-7, 12-8).

6. The device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 2, characterized in that: The low-load heater system comprises a fixed heating circuit and a test heating circuit, wherein the inlets of the fixed heating circuit and the test heating circuit are connected to the outlet of the heat exchange gas phase regulating valve (4), and the outlets of the fixed gasification circuit and the test gasification circuit are connected to the inlet of the medium recovery circuit and the inlet of the main engine regulating valve (6) in sequence; the fixed heating circuit is provided with a fixed low-load heating regulating valve (13-1), a fixed low-load heater and a fixed low-load heating stop valve (13-2) along the medium flow direction; the test heating circuit is provided with a test low-load heating regulating valve (13-3), a test low-load heater and a test low-load heating stop valve (13-4) along the medium flow direction.

7. A device for testing low-temperature medium heat exchange equipment and recovering medium according to claim 1, 2 or 3, characterized in that: The device is arranged with a plurality of sensors for real-time monitoring and control of the medium flow. The forced gasifier system (12) and the low-load heater system (13) are provided with temperature and pressure sensors at the inlet, and the heat exchange load of the heat exchange equipment is controlled by monitoring the medium parameters at the inlet of the heat exchange equipment; the forced gasifier system (12) and the low-load heater system (12) are provided with temperature, pressure and flow sensors at the outlet, and are used to detect the heat exchange performance of the heat exchange equipment; at the same time, the temperature, pressure and flow sensors provided at the inlet of the low-load heater system (12) can also control the opening of the spray regulating valve and adjust the spray flow; the first gas-liquid separator (16) and the second gas-liquid separator (17) are provided with temperature and liquid level sensors in the middle, and are used to monitor the internal temperature of the gas-liquid separator and control the opening and closing of the valve.

8. A device and method for testing low-temperature medium heat exchange equipment and recovering medium, characterized in that: The device for testing low-temperature medium heat exchange equipment and recovering medium according to claims 1 to 7 is used, and the method is as follows: The test working fluid for the constant temperature gas supply and equipment test of the device is a low temperature gas fuel, including but not limited to nitrogen, hydrogen, and natural gas; after the heat exchange test delivery pump (18) is turned on, the test device includes three working states: constant temperature gas supply, forced gasifier test, and low load heater test, and the working state of the test device is controlled by opening and closing the control valve; When the test device enters the "constant temperature gas supply" working state, the fixed gasification regulating valve (12-1), the fixed gasification stop valve (12-3), the fixed low-load heating regulating valve (13-1), the fixed low-load heating stop valve (13-2) and the host regulating valve (6) are opened, and medium flows in the heat exchanger test loop and flows to the host system. At this time, the test device is used to provide the host system with a gas fuel medium of 10-50 degrees Celsius; When the test device enters the "forced gasifier test" working state, the test gasification regulating valve (12-4), the test gasification stop valve (12-5), the fixed low-load heating regulating valve (13-1), the fixed low-load heating stop valve (13-2) and the medium recovery regulating valve (7) are opened, and medium flows in both the heat exchanger test circuit and the medium recovery circuit. At this time, the test device is used to perform equipment testing on the test forced gasifier; When the test device enters the "low-load heater test" working state, the fixed gasification regulating valve (12-1), the fixed gasification stop valve (12-3), the test low-load heating regulating valve (13-3), the test low-load heating stop valve (13-4) and the medium recovery regulating valve (7) are opened, and medium flows in both the heat exchanger test circuit and the medium recovery circuit. At this time, the test device is used to perform equipment testing on the test low-load heater.

9. The device and method for testing low-temperature medium heat exchange equipment and recovering medium according to claim 8, characterized in that: After the device enters the working state, in order to prevent the medium in the working circuit from entering the non-working circuit, the main engine regulating valve (6) and the medium recovery regulating valve (7) cannot be opened at the same time, the low-temperature medium regulating valve (10) and the air temperature heating regulating valve (11) cannot be opened at the same time, the fixed gasification regulating valve (12-1) and the test gasification regulating valve (12-4) cannot be opened at the same time, the fixed gasification stop valve (12-3) and the test gasification stop valve (12-5) cannot be opened at the same time, the fixed low-load heating regulating valve (13-1) and the test low-load heating regulating valve (13-3) cannot be opened at the same time, and the fixed low-load heating stop valve (13-2) and the test low-load heating stop valve (13-4) cannot be opened at the same time.

10. A method for testing low-temperature medium heat exchange equipment and medium recovery according to claim 8, characterized in that: The test working fluid used by the test device for constant temperature gas supply and equipment testing is low-temperature gas fuel, including nitrogen, hydrogen, natural gas, etc.

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