Thermal deoxidization performance experiment system suitable for negative pressure environment

Abstract

The invention provides a thermal deoxidization performance experiment system suitable for a negative pressure environment, which belongs to the technical field of thermal waterpower and comprises a condensate tank, a deaerator, a cooling heat exchanger, a cooling water tank, a vacuum tank, a flow measurement system, a pressure measurement system and a temperature measurement system. The condensate tank is connected with the deoxidizing loop, the cooling water tank is connected with the cooling loop, the deaerator is connected with the sampling pipeline, the cooling water tank is connected with the water replenishing pipeline, and the condensate tank is connected with the water draining pipeline; the deoxidizing loop is used for heating and deoxidizing the condensate water in the deoxidizing water tank; the cooling loop cools the heated water to prevent the condensate pump from cavitation; the sampling loop is used for sampling the liquid before and after oxygen removal and measuring the oxygen content of the liquid; the water replenishing loop is used for filling the deoxidizing loop with water before an experiment is carried out; and the drainage loop is used for draining water in the deoxidizing loop after the experiment is finished. The experimental system provided by the invention realizes the functions of negative pressure oxygen removal environment, oxygen content on-line measurement and continuous operation of the system.

Description

Technical Field

[0001] This invention belongs to the field of thermal hydraulic technology, specifically relating to an experimental system for thermal deoxygenation performance suitable for negative pressure environments. Background Technology

[0002] In nuclear power plants, dissolved oxygen in the condensate feedwater system causes corrosion of the steam-water circulation system and equipment. The main areas of corrosion are feedwater pipes, condensate drainage systems, and feedwater pumps after the deaerator. Corrosion in these areas not only affects system efficiency but can also lead to equipment damage and even threaten the safe operation of the nuclear power plant. Therefore, deoxygenation of the condensate in the feedwater system is crucial. Common deoxygenation methods include thermal deoxygenation, vacuum deoxygenation, and chemical deoxygenation. Thermal deoxygenation is widely used and receives considerable attention due to its minimal equipment requirements, simple operation, and low workload, making it the most frequently used deoxygenation method.

[0003] Because thermal deoxygenation systems are influenced by numerous factors and these factors have complex coupling relationships, experimental research is often necessary to ultimately determine their flow characteristics and deoxygenation capacity. Currently, there are many experimental studies on thermal deoxygenation, and some experimental rigs for thermal deoxygenation have been disclosed in patents and literature. However, these studies mainly focus on thermal deoxygenation under atmospheric pressure conditions. For example, patent number 202311870129.3 discloses a thermal deoxygenation system and method. When the entire system operates under negative pressure conditions, the heat exchange efficiency of the condenser is significantly improved, and it also offers advantages such as improved deoxygenation efficiency and avoidance of high temperature and high pressure. Therefore, thermal deoxygenation experiments under negative pressure conditions are currently receiving widespread attention.

[0004] However, the following problems exist when performing thermal deoxygenation under negative pressure conditions:

[0005] 1. The experiment was conducted in a negative pressure environment. Dissolved oxygen analyzers can only detect the oxygen content of liquids under normal pressure conditions. Liquids under negative pressure conditions cannot be directly measured.

[0006] 2. Under negative pressure conditions, the liquid will vaporize, causing cavitation in the pump, which will reduce the pump head, reduce power, and make it difficult to maintain the stability of the water flow in the entire circuit.

[0007] 3. In the entire thermal deoxygenation experimental system, as oxygen is continuously generated, it is difficult to maintain a certain pressure.

[0008] Therefore, there is an urgent need for a thermal deoxygenation experimental platform capable of solving the above problems under negative pressure conditions, in order to study the thermo-hydraulic characteristics of thermal deoxygenation systems under negative pressure. Designing an experimental platform capable of thermal deoxygenation under negative pressure is essential to provide accurate and reliable data for the design and optimization of thermal deoxygenation systems. Summary of the Invention

[0009] The purpose of this invention is to provide a thermal deoxygenation performance test system suitable for negative pressure environments, which solves the problems of limited dissolved oxygen measurement, pump cavitation, and pressure fluctuation in the prior art, and provides an innovative experimental platform for the field of thermal deoxygenation.

[0010] The objective of this invention is achieved through the following technical solution:

[0011] A thermal deoxygenation performance test system suitable for negative pressure environment includes: condensate tank, deaerator, cooling heat exchanger, cooling water tank, vacuum tank one, vacuum tank two, flow measurement system, pressure measurement system, and temperature measurement system;

[0012] The condensate tank is connected to the deoxygenation circuit, the cooling water tank is connected to the cooling circuit, the deaerator is connected to the sampling pipeline, the cooling water tank is connected to the water supply pipeline, and the condensate tank is connected to the drainage pipeline.

[0013] The flow measurement system includes a large condensate flow meter, a small condensate flow meter, and a cooling water flow meter. The large condensate flow meter and the small condensate flow meter are installed in parallel on the pipeline between the deaerator and the cooling heat exchanger to measure condensate at different flow rates. The cooling water flow meter is installed on the pipeline between the cooling heat exchanger and the cooling water tank.

[0014] The pressure measurement system includes a pressure gauge connected to the condensate tank, which measures the pressure of the condensate in the entire deaeration circuit.

[0015] The temperature measurement system includes a set of thermocouple measuring points, which are set inside the deaerator. During the experiment, the temperature change of the water inside the deaerator is measured to ensure that the condensate inside the deaerator is heated to the saturation temperature evenly.

[0016] Furthermore, the deaeration circuit starts from the condensate tank outlet and sequentially passes through valve one, deaerator, flow meter valve one or flow meter valve two, condensate large flow meter or condensate small flow meter, cooling heat exchanger, condensate pump, condensate flow control valve, and then returns to the condensate tank.

[0017] Furthermore, the cooling circuit starts from the cooling water tank, passes sequentially through the cooling water flow control valve, the cooling water pump, the cooling water control valve, the cooling heat exchanger, and the cooling water flow meter before returning to the cooling water tank. The cooling circuit provides cooling for the deoxygenated water to ensure that its temperature meets the experimental requirements or actual application needs.

[0018] Furthermore, the sampling pipeline includes sampling pipeline A and sampling pipeline B. Sampling pipeline A starts at the inlet of the deaerator and flows sequentially through the condensate collection valve, vacuum tank one, and gate valve one before flowing into the flow channel. Sampling pipeline B starts at the outlet of the deaerator and flows sequentially through the deoxygenated water collection valve, vacuum tank two, and gate valve two before flowing into the flow channel. The sampling pipeline is used to collect water samples before and after deoxygenation in order to measure and analyze parameters such as oxygen content in the water.

[0019] Furthermore, when collecting samples, the sampling pipeline first evacuates vacuum tank one and vacuum tank two to a vacuum state, and uses the pressure difference to allow condensate and deoxygenated water to flow into vacuum tank one and vacuum tank two. After vacuum tank one and vacuum tank two are filled with water, the condensate collection valve and the deoxygenated water collection valve are closed, and then inert gas is introduced into vacuum tank one and vacuum tank two to restore atmospheric pressure. Then, gate valve one and gate valve two are opened to discharge the water into the flow channel containing the dissolved oxygen meter for oxygen content measurement.

[0020] Furthermore, the water supply pipeline starts from the cooling water tank and sequentially passes through the cooling water flow control valve, cooling water pump, water supply valve, condensate pump, condensate flow control valve, condensate tank, valve, deaerator, flow meter valve one or flow meter valve two, large condensate flow meter or small condensate flow meter, and cooling heat exchanger to fill the loop with water. The water supply pipeline supplies water to the entire experimental device to ensure that the system always maintains a sufficient water volume during the experiment.

[0021] Furthermore, the drainage pipeline is a drain valve and its pipes below the condensate tank that are connected to the atmospheric environment. After the experiment is completed, or when it is necessary to drain the system, the water in the condensate tank can be drained by opening the drain valve.

[0022] Furthermore, the upper ends of the large-flow condensate meter and the small-flow condensate meter are connected to the tube-side inlet of the cooling heat exchanger, and the lower ends are connected to the outlet of the deaerator through the large-flow meter control valve and the small-flow meter control valve.

[0023] Furthermore, the deaerator has a glass window, through which a high-speed camera can be used to observe, photograph, and record the interior of the deaerator.

[0024] Furthermore, an electric heater is installed on the condensate tank;

[0025] The condensate tank is connected to the vacuum pump via a vacuum valve.

[0026] Vacuum tank one and vacuum tank two are respectively connected to vacuum pump two via vacuum valve two. Vacuum tank one is connected to inert gas control valve one, and vacuum tank two is connected to inert gas control valve two.

[0027] The condensate pump is connected in parallel with the condensate pump bypass valve;

[0028] The cooling water pump is connected in parallel with the cooling water pump bypass valve.

[0029] The beneficial effects of this invention are as follows:

[0030] This invention sets up a sampling circuit and solves the technical problem that liquid dissolved oxygen cannot be directly measured under negative pressure by using pressure difference to pump water and inert gas pressurization to restore normal pressure. It also prevents secondary contact between the sampled water and oxygen before measurement. By comparing the oxygen content of the two by a dissolved oxygen meter, the deoxygenation efficiency can be directly evaluated.

[0031] This invention incorporates a cooling circuit that uses forced cooling to keep the condensate pump inlet water temperature below saturation temperature, preventing cavitation and reducing wear on the impeller and seals. It also improves deoxygenation efficiency and ensures stable water flow throughout the circuit.

[0032] The system of this invention has high compatibility, and the sampling circuit is seamlessly connected with the deoxygenation circuit and the cooling circuit, so that sampling can be completed without interrupting the experimental process.

[0033] The design of the water replenishment circuit and drainage circuit in this invention simplifies the process of initial water injection and post-experiment drainage, avoiding corrosion caused by long-term water storage in the equipment.

[0034] This invention utilizes an intelligent vacuum pump to set the operating pressure to a specified value, ensuring that the entire experimental system is maintained at the specified pressure. Attached Figure Description

[0035] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0036] In the attached diagram: 1. Condensate tank; 2. Deaerator; 3. Cooling heat exchanger; 4. Cooling water tank; 5. Vacuum tank one; 6. Vacuum valve one; 7. Valve; 8. Vacuum tank two; 9. High flow meter control valve; 10. Low flow meter control valve; 11. Condensate pump bypass valve; 12. Condensate flow control valve; 13. Cooling water flow control valve; 14. Cooling water pump bypass valve; 15. Cooling water control valve; 16. Make-up water valve; 17. Vacuum valve two; 18. Condensate... 19. Sampling valve; 20. Deoxygenated water sampling valve; 21. Inert gas control valve II; 22. Inert gas control valve I; 23. Gate valve I; 24. Gate valve II; 25. Condensate pump; 26. Cooling water pump; 27. Vacuum pump I; 28. Vacuum pump II; 29. ​​Large condensate flow meter; 30. Small condensate flow meter; 31. Cooling water flow meter; 32. Electric heater; 33. Drain valve; 34. Glass window; 35. Thermocouple measuring point; 36. Pressure gauge. Detailed Implementation

[0037] The present invention will now be further described with reference to the accompanying drawings.

[0038] This invention provides an experimental system for thermal deoxygenation performance in negative pressure environments, as shown in the attached figure. Figure 1 As shown, it includes: condensate tank 1, deaerator 2, cooling heat exchanger 3, cooling water tank 4, vacuum tank 5, and flow measurement system, pressure measurement system, and temperature measurement system;

[0039] The condensate tank 1 is connected to the deoxygenation circuit, the cooling water tank 4 is connected to the cooling circuit, the deaerator is connected to the sampling pipeline, the cooling water tank 4 is connected to the water supply pipeline, and the condensate tank 1 is connected to the drainage pipeline.

[0040] The flow measurement system includes a large condensate flow meter 28, a small condensate flow meter 29, and a cooling water flow meter 30. The large condensate flow meter 28 and the small condensate flow meter 29 are installed in parallel on the pipeline between the deaerator 2 and the cooling heat exchanger 3 to measure condensate at different flow rates. The cooling water flow meter 30 is installed on the pipeline between the cooling heat exchanger 3 and the cooling water tank 4.

[0041] The pressure measurement system includes a pressure gauge 35, which is connected to the condensate tank 1. The pressure gauge 35 measures the pressure of the condensate in the entire deaeration circuit.

[0042] The temperature measurement system includes a set of thermocouple measuring points 34, which are set inside the deaerator 2. During the experiment, the temperature change of the deaerator water is measured to ensure that the condensate in the deaerator is heated to the saturation temperature evenly.

[0043] Furthermore, the upper ends of the large condensate flow meter 28 and the small condensate flow meter 29 are connected to the pipe-side inlet of the cooling heat exchanger 3, and the lower ends are connected to the outlet of the deaerator 2 through the large flow meter control valve 9 and the small flow meter control valve 10.

[0044] The deaerator has a glass window 33, through which a high-speed camera can be used to observe, photograph, and record the interior of the deaerator.

[0045] In this embodiment, the deoxygenation circuit starts from the outlet of the condensate tank 1 and passes sequentially through valve 7, deaerator 2, flow meter valve 9 or flow meter valve 10, large condensate flow meter 28 or small condensate flow meter 29, cooling heat exchanger 3, condensate pump 24, condensate flow control valve 12 and then returns to the condensate tank 1. The deoxygenation circuit can heat and deoxygenate the condensate in the deoxygenated water tank.

[0046] In this embodiment, the cooling circuit starts from the cooling water tank 4 and sequentially passes through the cooling water flow control valve 13, the cooling water pump 25, the cooling water control valve 15, the cooling heat exchanger 3, the cooling water flow meter 30, and then returns to the cooling water tank 4. The cooling circuit provides cooling for the deoxygenated water to ensure that its temperature meets the experimental requirements or actual application needs. The heated water is cooled by the cooling water tank, the cooling heat exchanger and other equipment to prevent cavitation of the condensate pump.

[0047] In this embodiment, the sampling pipeline includes sampling pipeline A and sampling pipeline B. Sampling pipeline A starts from the inlet of deaerator 2, passes sequentially through condensate collection valve 18, vacuum tank 5, gate valve 22, and then flows into the flow channel. Sampling pipeline B starts from the outlet of deaerator 2, passes sequentially through deoxygenated water collection valve 19, vacuum tank 8, gate valve 23, and then flows into the flow channel. The sampling pipeline is used to collect water samples before and after deoxygenation in order to measure and analyze parameters such as oxygen content in the water.

[0048] In this embodiment, when collecting samples, the sampling pipeline first evacuates vacuum tank 5 and vacuum tank 8 to a vacuum state, and uses the pressure difference to allow condensate and deoxygenated water to flow into vacuum tank 5 and vacuum tank 8. After vacuum tank 5 and vacuum tank 8 are filled with water, the condensate collection valve 18 and the deoxygenated water collection valve 19 are closed. Then, inert gas is introduced into vacuum tank 5 and vacuum tank 8 to restore atmospheric pressure. Then, gate valve 22 and gate valve 23 are opened to discharge water into the flow channel containing the dissolved oxygen meter for oxygen content measurement.

[0049] In this embodiment, the water supply pipeline starts from the cooling water tank 4 and sequentially passes through the cooling water flow control valve 13, cooling water pump 25, water supply valve 16, condensate pump 24, condensate flow control valve 12, condensate tank 1, valve 7, deaerator 2, flow meter valve 9 or flow meter valve 10, condensate large flow meter 28 or condensate small flow meter 29, and cooling heat exchanger 3 to fill the loop with water. The water supply pipeline supplies water to the entire experimental device, ensuring that the system always maintains a sufficient water volume during the experiment.

[0050] In this embodiment, the drainage pipeline is the drain valve 32 below the condensate tank 1 and its connecting pipes, which are connected to the atmospheric environment. After the experiment, or when it is necessary to drain the system, the water in the condensate tank 1 is drained by opening the drain valve 32. The drainage circuit is used to remove water from the deoxygenation circuit after the experiment to prevent water from remaining in the equipment for a long time and causing the equipment to rust.

[0051] An electric heater 31 is installed on the condensate tank 1;

[0052] The condensate tank 1 is connected to the vacuum pump 26 via vacuum valve 6;

[0053] The first vacuum tank 5 and the second vacuum tank 8 are respectively connected to the second vacuum pump 27 via the second vacuum valve 27. The first vacuum tank 5 is connected to the first inert gas control valve 21, and the second vacuum tank 8 is connected to the second inert gas control valve 20.

[0054] The condensate pump 24 is connected in parallel with the condensate pump bypass valve 11;

[0055] The cooling water pump 25 is connected in parallel with the cooling water pump bypass valve 14.

[0056] This embodiment also includes:

[0057] An experimental method for the above-mentioned thermal deoxygenation performance test system suitable for negative pressure environment, the method comprising the following steps:

[0058] Before conducting thermal deoxygenation, check all valves and debug all equipment in the experimental setup to ensure the independent and coordinated operation of each device in the system. Turn on the data acquisition system in advance to monitor the status of the entire experimental system, ensuring all systems are functioning properly and completing the pre-experiment preparations.

[0059] Open the cooling water flow control valve 13, the circuit water supply valve 16, and the cooling water pump 25 to replenish water to the cooling circuit, deaeration circuit, and sampling circuit, ensuring that all air in the pipelines is purged. This can be done by opening the air vent valve in the pipeline and allowing water to flow slowly until no more air bubbles emerge from the air vent valve, then close the air vent valve. After replenishing water, check the sealing of each circuit to prevent leaks.

[0060] Turn on the intelligent vacuum pump 26 to continuously evacuate the circuit, maintaining the circuit pressure near the specified pressure. Turn on the electric heater 31 to heat the water in the condensate tank 1, heating the water in the deaeration circuit to the specified temperature and then stopping the heating. At this time, open the gate valve 7, gate valve 8, high-flow meter control valve 9, condensate flow control valve 12, and condensate pump 24. By controlling the condensate pump bypass valve 11 and the condensate flow control valve 12, adjust the water flow in the circuit until the condensate high-flow meter 28 displays the specified flow rate. Then, heat and deaerate the cooling water in the deaerator.

[0061] Open cooling water flow control valve 13, cooling water control valve 15, and cooling water pump 25 to cool the water in the deoxygenation circuit. At this time, use a high-speed camera to observe, photograph, and record the interior of the deaerator through the glass window 33. Observe the boiling of the condensate in the deaerator, the number and size of bubbles, and the flow state of the water. When a large number of bubbles are seen in the water tank, it indicates that the condensate has been heated to saturation temperature and oxygen has been released. At this time, open vacuum valve 17 and vacuum pump 27 to remove all air from the vacuum tank 5. Close vacuum valve 17 and vacuum pump 27, and open condensate sampling valve 18 and deoxygenated water sampling valve 19 to discharge condensate and deoxygenated water into the vacuum tank 5 using the pressure difference. Observe the level gauge reading next to the vacuum tank 5. When the tank is full of water, close condensate sampling valve 18 and deoxygenated water sampling valve 19, and open inert gas control valve 20 and inert gas control valve 21 to introduce inert gas into the vacuum tank 5, restoring the vacuum tank 5 to normal pressure.

[0062] Open gate valve 1 (22) and gate valve 2 (23), and continuously introduce inert gas into vacuum tank 5 to prevent oxygen from coming into secondary contact with deoxygenated water. Drain the water in vacuum tank 5 into the flow trough containing the dissolved oxygen meter. Measure the oxygen content in the condensate and deoxygenated water respectively. After emptying the water in vacuum tank 5, close inert gas control valve 2 (20), inert gas control valve 1 (21), gate valve 1 (22), and gate valve 2 (23). Then repeat the above sampling steps (vacuuming - sampling - filling with non-condensable gas - draining and measuring oxygen content) and record multiple sets of data until the oxygen content of the deoxygenated water decreases to the specified value.

[0063] After one set of experiments, heating of the condensate in deaerator 2 is stopped. Condensate pump 24 is turned off, stopping water circulation. Cooling water pump 25 is turned off, stopping cooling of the deaerated water. Then, the circuit is gradually restored to atmospheric pressure, allowing outside air to enter the circuit. Condensate tank 1 is cooled, and the cooling circuit is continuously operated until the water temperature in condensate tank 1 drops to a suitable level. The previous operation is then repeated for the next set of experiments. By controlling the condensate pump bypass valve 11 and the condensate flow control valve 12 to change the condensate flow rate, multiple experiments are conducted following the above steps to obtain experimental data under different condensate flow rate conditions, in order to further study the influence of condensate flow rate on deaeration performance.

[0064] After the experiment, first stop heating the condensate, then turn off the condensate pump 24 to stop water circulation. Turn off the cooling water pump 25 to stop cooling the deoxygenated water. Then gradually restore the circuit to atmospheric pressure, drain the condensate from the condensate tank through the drain valve 32, and process the data collected by the acquisition system and the data obtained by the dissolved oxygen meter.

[0065] In each experiment, it is essential to ensure the consistency and stability of experimental conditions, reduce experimental errors, and guarantee the reliability and accuracy of experimental results.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermal deoxygenation performance test system suitable for negative pressure environments, characterized in that, include: Condensate tank (1), deaerator (2), cooling heat exchanger (3), cooling water tank (4), vacuum tank one (5), vacuum tank two (8), and flow measurement system, pressure measurement system, and temperature measurement system; The condensate tank (1) is connected to the deoxygenation circuit, the cooling water tank (4) is connected to the cooling circuit, the deaerator is connected to the sampling pipeline, the cooling water tank (4) is connected to the water supply pipeline, and the condensate tank (1) is connected to the drainage pipeline. The flow measurement system includes a large condensate flow meter (28), a small condensate flow meter (29), and a cooling water flow meter (30). The large condensate flow meter (28) and the small condensate flow meter (29) are installed in parallel on the pipeline between the deaerator (2) and the cooling heat exchanger (3) to measure condensate with different flow rates. The cooling water flow meter (30) is installed on the pipeline between the cooling heat exchanger (3) and the cooling water tank (4). The pressure measurement system includes a pressure gauge (35), which is connected to the condensate tank (1) and measures the pressure of the condensate in the entire deoxygenation circuit. The temperature measurement system includes a set of thermocouple measuring points (34), which are set inside the deaerator (2). During the experiment, the temperature change of the deaerator water is measured to ensure that the condensate in the deaerator is heated to the saturation temperature evenly.

2. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 1, characterized in that, The deoxygenation circuit starts from the outlet of the condensate tank (1), passes through valve one (7), deaerator (2), flow meter valve one (9) or flow meter valve two (10), large condensate flow meter (28) or small condensate flow meter (29), cooling heat exchanger (3), condensate pump (24), condensate flow control valve (12) and then returns to the condensate tank (1).

3. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 1 or 2, characterized in that, The cooling circuit starts from the cooling water tank (4), passes through the cooling water flow control valve (13), the cooling water pump (25), the cooling water control valve (15), the cooling heat exchanger (3), the cooling water flow meter (30), and then returns to the cooling water tank (4). The cooling circuit provides cooling for the deoxygenated water to ensure that its temperature meets the experimental requirements or actual application needs.

4. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 3, characterized in that, The sampling pipeline includes sampling pipeline A and sampling pipeline B. Sampling pipeline A starts from the inlet of the deaerator (2), passes through the condensate collection valve (18), vacuum tank one (5), gate valve one (22) and then flows into the flow channel. Sampling pipeline B starts from the outlet of the deaerator (2), passes through the deoxygenated water collection valve (19), vacuum tank two (8), gate valve two (23) and then flows into the flow channel. The sampling pipeline is used to collect water samples before and after deoxygenation so as to measure and analyze parameters such as oxygen content in the water.

5. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 4, characterized in that, When collecting samples, the sampling pipeline first evacuates vacuum tank 1 (5) and vacuum tank 2 (8) to a vacuum state, and uses the pressure difference to make condensate and deoxygenated water flow into vacuum tank 1 (5) and vacuum tank 2 (8). After the vacuum tank 1 (5) and vacuum tank 2 (8) are filled with water, the condensate collection valve (18) and the deoxygenated water collection valve (19) are closed. Then, inert gas is introduced into vacuum tank 1 (5) and vacuum tank 2 (8) to restore atmospheric pressure. Then, gate valve 1 (22) and gate valve 2 (23) are opened to discharge water into the flow channel containing the dissolved oxygen meter for oxygen content measurement.

6. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 4 or 5, characterized in that, The water supply pipeline starts from the cooling water tank (4) and passes sequentially through the cooling water flow control valve (13), cooling water pump (25), water supply valve (16), condensate pump (24), condensate flow control valve (12), condensate tank (1), valve (7), deaerator (2), flow meter valve one (9) or flow meter valve two (10), large condensate flow meter (28) or small condensate flow meter (29), and cooling heat exchanger (3) to fill the loop with water. The water supply pipeline supplies water to the entire experimental device to ensure that the system always maintains a sufficient water volume during the experiment.

7. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 6, characterized in that, The drainage pipeline is the drain valve (32) below the condensate tank (1) and its pipeline connected to the atmospheric environment. After the experiment, or when it is necessary to drain the system, the water in the condensate tank (1) can be drained by opening the drain valve (32).

8. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 7, characterized in that, The upper ends of the large flow meter (28) and the small flow meter (29) are connected to the pipe-side inlet of the cooling heat exchanger (3), and the lower ends are connected to the outlet of the deaerator (2) through the large flow meter control valve (9) and the small flow meter control valve (10).

9. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 6 or 7, characterized in that, The deaerator has a glass window (33) through which a high-speed camera can be used to observe, photograph, and record the interior of the deaerator.

10. The thermal deoxygenation performance test system suitable for negative pressure environments according to claim 9, characterized in that, An electric heater (31) is installed on the condensate tank (1); The condensate tank (1) is connected to the vacuum pump (26) via a vacuum valve (6); The first vacuum tank (5) and the second vacuum tank (8) are respectively connected to the second vacuum pump (27) via the second vacuum valve (17). The first vacuum tank (5) is connected to the first inert gas control valve (21), and the second vacuum tank (8) is connected to the second inert gas control valve (20). The condensate pump (24) is connected in parallel with the condensate pump bypass valve (11); The cooling water pump (25) is connected in parallel with the cooling water pump bypass valve (14).

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