Double-circuit cooling device for water-cooled coil of tokamak test device and use method thereof

Abstract

The application discloses a double-circuit cooling device for a water-cooled coil of a tokamak test device and a use method thereof, and the device comprises a water tank, a refrigeration-side chilled water circulation loop, a test device-side cooling water circulation loop and an air-cooled module unit. By taking a commercially available single-cooling air-cooled module as a cold source, adopting a double-circulation loop which is independently operated and mixing water in the water tank to reduce temperature, the water temperature of 20±2℃ of the tokamak device test device is realized, the refrigerating capacity of the air-cooled module is effectively reduced, water is stored in the water tank, the huge heat released by the tokamak test device is effectively absorbed in the form of water heat storage, the water temperature is reduced and stabilized, the water temperature fluctuation is reduced, and the operation of the refrigeration device (air-cooled module unit) is provided. The application can effectively take away the huge heat released by the tokamak device in operation by the cooling water with low refrigerating capacity, and is successfully put into actual operation.

Description

TECHNICAL FIELD

[0001] The application relates to the field of new energy and energy-saving technology, and particularly relates to a double-loop cooling device for a water-cooled coil of a tokamak test device and a use method. BACKGROUND

[0002] Magnetic confinement controlled nuclear fusion and high-temperature plasma technology is a process of using two lighter atomic nuclei to aggregate into a heavier atomic nucleus and releasing energy. The realized nuclear fusion reaction is the fusion of hydrogen isotopes, deuterium and tritium, which has been going on for 5 billion years on the sun. Magnetic confinement controlled nuclear fusion, also known as artificial sun, is based on the principle of nuclear fusion reaction, which mainly uses hydrogen isotopes (deuterium and tritium). Nuclear fusion does not produce long-term and high-level nuclear radiation, nuclear waste, and greenhouse gases, and basically does not pollute the environment. Human understanding of thermonuclear fusion began with the explosion of hydrogen bombs. Magnetic confinement controlled nuclear fusion and high-temperature plasma devices can effectively control the process of "hydrogen bomb explosion", allowing energy to be continuously and stably output, providing clean energy for people, and is one of the ways to replace petrochemical energy and protect the environment in the future.

[0003] So far, there are four countries in the world that have their own tokamak devices, Tore-Supra in France, T-15 in Russia, JT-60U in Japan, and EAST (Extrusion Tokamak Reactor) in China. In addition, there is the largest international cooperation ITER (International Thermonuclear Experimental Reactor).

[0004] The magnetic control coil group of the tokamak device is used to generate a strong magnetic field to meet the needs of the test environment. The magnetic control coil group adopts a water cooling method to take away the heat generated during operation. The coil group discharges 51.84 MJ of electric energy within 5 seconds, with an average heat release heat rate of 10.368 MW. The heat needs to be taken away by the water cooling method and released to the atmospheric environment.

[0005] According to the prior art, if a single-loop cooling water system is used, there are (1) the theoretical minimum water flow of the cold source (14.87 m 3 / h) is greater than the water volume (13.21 m 3h); (2) when the water flow based on the cold source is greater than the water flow of the Tokamak test device water-cooled coil, a bypass pipe and a bypass valve are needed to bypass the excess water flow when a single loop cooling is used, the pipe where the bypass pipe and the bypass valve are located is in parallel with the Tokamak test device, therefore the inlet pressure of the Tokamak test device cooling water is 1.0 MPa, which is also the inlet pressure of the bypass pipe, the outlet pressure of the cooling water is 0.2 MPa, which is also the outlet pressure of the bypass pipe, the pressure difference of the test device is 0.8 MPa (about 80 mH2O), and the bypass pipe and the bypass valve need to eliminate the pressure energy of the water flow through a pressure stabilizing valve group to realize effective bypassing; (3) in order to ensure the cooling effect, when the water flow is increased, the pressure energy of 0.8 MPa of the water flow must be consumed through the bypass pipe, and the greater the flow through the bypass valve, the greater the energy consumed, and the energy consumed needs to be provided by the water pump, resulting in increased actual operation energy consumption and no improvement in cooling effect. SUMMARY

[0006] The purpose of the present application is to provide a double-loop cooling device for a Tokamak test device water-cooled coil to overcome the deficiencies of the cooling water cooling and temperature reduction technology of the Tokamak device water-cooled coil in the prior art.

[0007] To solve the above technical problems, the present application adopts the following technical solutions:

[0008] A double-loop cooling device for a Tokamak test device water-cooled coil, comprising a water tank, a refrigeration side chilled water circulation loop, a test device side cooling water circulation loop and an air cooling module unit.

[0009] The air cooling module unit and the refrigeration side chilled water circulation loop are connected on one side; the refrigeration side chilled water circulation loop is connected with the test device side cooling water circulation loop through the water tank on the other side; the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are independent loops, and the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are configured with independent water pumps.

[0010] Preferably, the water tank is an open water tank.

[0011] Preferably, the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are open pipes.

[0012] Preferably, the air cooling module unit comprises a first air cooling module, a second air cooling module and a third air cooling module, and the first air cooling module, the second air cooling module and the third air cooling module are connected in parallel.

[0013] Preferably, the cooling capacity of the air cooling module, the second air cooling module and the third air cooling module is configured in a gradient.

[0014] Preferably, the pipe of the refrigeration side chilled water circulation loop is connected with the horizontal straight pipe section of the water tank to connect the chilled water pipe backflow preventer, and the pipe of the test side cooling water circulation loop is connected with the horizontal straight pipe section of the water tank to connect the cooling water backflow preventer.

[0015] Preferably, a first water temperature sensor with a transmitter is arranged on the water inlet pipe of the air-cooled module machine of the air-cooled module unit.

[0016] Preferably, the refrigeration side chilled water circulation loop is provided with a refrigeration side chilled water first circulating water pump and a refrigeration side chilled water second circulating water pump, and the refrigeration side chilled water first circulating water pump and the refrigeration side chilled water second circulating water pump are standby for each other and are not started at the same time; the test device side cooling water circulation loop is provided with a test device side cooling water first circulating water pump and a test device side cooling water second circulating water pump, and the test device side cooling water first circulating water pump and the test device side cooling water second circulating water pump are standby for each other and are not started at the same time.

[0017] Preferably, a pipe type electric heater is arranged on the pipe of the refrigeration side chilled water circulation loop, the pipe type electric heater is interlocked with the air-cooled module unit, the pipe type electric heater and the air-cooled module machine of the air-cooled module unit cannot be started at the same time; when the pipe type electric heater is running, the refrigeration side chilled water first circulating water pump or the refrigeration side chilled water second circulating water pump must be running normally.

[0018] The use method of the double-loop cooling device of the Tokamak test device water-cooled coil includes the following steps:

[0019] s1, close the open drain valve and the drain stop valve, open the refrigeration side first butterfly valve, the refrigeration side second butterfly valve, the cooling water pipe adjustment stop valve, the chilled water pipe adjustment stop valve and the first stop valve; two independent pipes (except the backflow preventer to the water tank inlet section) are in full water state through debugging, the chilled water flow is distributed according to the requirements, and the target type flow switch is opened.

[0020] s2, if the water tank water temperature is higher than 20℃ during operation, start the test device side first circulating water pump or the test device side second circulating water pump, the refrigeration side first circulating water pump or the refrigeration side second circulating water pump, first reduce the water temperature to 20±1℃, and then perform the test; if the cooling water tank water temperature is lower than 20℃, simultaneously start the test device side first circulating water pump or the test device side second circulating water pump, the refrigeration side first circulating water pump or the refrigeration side second circulating water pump, first heat the water temperature to 20±1℃, and then perform the test.

[0021] s3, the second water temperature sensor with transmitter in the water tank measures the water temperature higher than 22℃, the forced air cooling module unit starts; if the water resistivity sensor in the water tank measures the water resistivity less than 0.5MΩ·cm, the raw water pump and the pure water unit are started; if the water level sensor in the water tank measures the water level lower than the set value, the raw water pump and the pure water unit are started, and higher than the set value, stop;

[0022] s4, the second water temperature sensor with transmitter in the water tank measures the water temperature at 22℃±2℃, the first circulating water pump of the cooling water on the test device side or the second circulating water pump of the cooling water on the test device side is allowed to start.

[0023] Compared with the prior art, the present application has the following beneficial technical effects:

[0024] A double-circuit cooling device for the water-cooled coil of a tokamak test device, comprising a water tank, a refrigeration side chilled water circulation loop, a test device side cooling water circulation loop and an air cooling module unit;

[0025] The air cooling module unit and the refrigeration side chilled water circulation loop are connected on one side; the refrigeration side chilled water circulation loop is connected with the test device side cooling water circulation loop through the water tank on the other side; the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are independent loops, and the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are configured with independent water pumps; each circulation loop independently operates and does not interfere with each other, so as to realize the requirement of 20±2℃ of the inlet water temperature of the tokamak device cooling water by taking the air cooling module unit as the cold source and adopting the double-circuit cooling water tank mixed water cooling mode of independent operation, effectively reduce the refrigerating capacity of the air cooling module unit of the cooling water system, realize the separation of the thermodynamic non-steady-state loop of the test device side cooling water loop and the near steady-state loop of the refrigeration side chilled water loop, and realize the independent operation of the non-steady-state cooling water circulation pipeline and the near steady-state cold source side chilled water circulation pipeline, which do not interfere with each other, can well take away the huge heat released instantaneously during the operation of the tokamak device by the cooling water with lower refrigerating capacity, and can be smoothly put into actual operation.

[0026] Preferably, the water tank is an open water tank, and the test device side cooling water and the refrigeration side chilled water circulation pipeline adopt an open water tank connection and can independently circulate, and the pressure and temperature between the pipelines are almost not interfered.

[0027] Preferably, the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are open pipelines, which do not need to be pressure-fixed relative to closed pipelines, at least one set of pressure-fixed water supplement device is saved, and the water hammer phenomenon of the pipeline is avoided or slowed down.

[0028] Preferably, the pipe of the refrigeration side chilled water circulation loop is connected with the horizontal straight pipe section of the water tank to set a chilled water pipe backflow preventer, the pipe of the test side cooling water circulation loop is connected with the horizontal straight pipe section of the water tank to set a cooling water backflow preventer, the setting of the backflow preventer can effectively prevent cavitation, ensure that the pipe is full of water, and solve the problems of rapid cooling and response of the refrigeration system and the cooling water.

[0029] Preferably, a first water temperature sensor with a transmitter is arranged on the water inlet pipe of the air-cooled module unit to start the air-cooled module unit when the first water temperature sensor with the transmitter measures that the inlet water temperature of the air-cooled module unit is higher than the set water temperature value. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the double-loop cooling water device of the tokamak test device in the embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the temperature change rule of the PF2 coil of the tokamak device with time in the embodiment of the present application.

[0032] 1A - first air-cooled module machine; 1B - second air-cooled module machine; 1C - third air-cooled module machine; 2 - refrigeration side chilled water drain valve; 3 - target type flow switch; 4A - first water pipe spherical flexible connection; 4B - second water pipe spherical flexible connection; 5 - bimetallic pointer type thermometer; 6 - refrigeration side diaphragm box type pointer pressure gauge; 7A - first water temperature sensor with transmitter; 7B - second water temperature sensor with transmitter; 8 - refrigeration side first butterfly valve; 8T - refrigeration side second butterfly valve; 9A - first Y type filter; 10 - first check valve; 14E - first stop valve; 14T - chilled water pipe regulating stop valve; 15A - chilled water pipe backflow preventer; 16 - resistivity sensor with transmitter; 17 - liquid level sensor with transmitter; 18A - refrigeration side chilled water first circulating water pump; 18B - refrigeration side chilled water second circulating water pump; 19 - water tank (only shown in the figure, not actual); 20 - pipe type electric heater; 2A - second drain valve; 4 - third water pipe spherical flexible connection; 6A - test device side diaphragm box type pointer pressure gauge; 7 - third water temperature sensor with transmitter; 9B - second Y type filter; 10A - second check valve; 11 - flow sensor with transmitter; 12 - cooling water pipe pressure sensor with transmitter; 13 - safety valve; 14 - second stop valve, 14A - drain stop valve; 14B - cooling water pipe regulating stop valve; 15B - cooling water pipe backflow preventer; 21A - test device side cooling water first circulating water pump; 21B - test device side cooling water second circulating water pump; 22 - test device side cooling water normally open butterfly valve; 22T - test device side cooling water pipe pump outlet regulating butterfly valve; 23T - test device side cooling water pipe test device inlet regulating butterfly valve; 24 - cooling water test device inlet butterfly valve. DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should belong to the protection scope of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] This invention takes the cooling water cooling technology of the water-cooled coil of the CTRFR (Compact-Tokamak based repetitive Reconnection-heated Fusion Reactor) device as an example.

[0036] like Figure 1 As shown, the present invention provides a dual-loop cooling water device for a water-cooled coil of a tokamak device, comprising a water tank 19, a chilled water circulation loop on the cooling side, a cooling water circulation loop on the test device side, and an air-cooled module unit.

[0037] The air-cooled module unit is connected to one side of the chilled water circulation loop on the cooling side; the other side of the chilled water circulation loop on the cooling side is connected to the water tank 19, and the other side of the water tank 19 is connected to the cooling water circulation loop on the test device side; the chilled water circulation loop on the cooling side and the cooling water circulation loop on the test device side are independent loops, and each of them is equipped with an independent water pump.

[0038] In this invention, the cooling water circuit of the water-cooled coil of the tokamak device is designed as two circuits—a chilled water circulation circuit on the cooling side and a cooling water circulation circuit on the test device side. The two circulation circuits are independent circuits. Each circulation circuit is equipped with an independent circulating water pump. The two circulation circuits, the chilled water circulation circuit on the cooling side and the cooling water circulation circuit on the test device side, operate independently and do not interfere with each other.

[0039] In the application, the double-circuit cooling water device of the whole tokamak device water-cooled coil is provided with a wind-cooled module unit cooling and temperature reduction, the wind-cooled module unit includes a first wind-cooled module unit 1A, a second wind-cooled module unit 1B and a third wind-cooled module unit 1C, the first wind-cooled module unit 1A, the second wind-cooled module unit 1B and the third wind-cooled module unit 1C are connected in parallel, the first wind-cooled module unit 1A, the second wind-cooled module unit 1B and the third wind-cooled module unit 1C are arranged on the refrigeration side chilled water circulation loop, the first wind-cooled module unit 1A, the second wind-cooled module unit 1B and the third wind-cooled module unit 1C adopt the easily obtained commercial single-cooled wind-cooled module, the refrigeration capacities of the first wind-cooled module unit 1A, the second wind-cooled module unit 1B and the third wind-cooled module unit 1C are configured in stages, the refrigeration capacities of the first wind-cooled module unit 1A, the second wind-cooled module unit 1B and the third wind-cooled module unit 1C are 65kW, 130kW and 130kW respectively, one compressor is arranged for every 65kW of the wind-cooled module unit, and when running, the multi-stage adjustment operation of 20%, 40%, 60%, 80% and 100% of the chilled water flow can be realized by starting and stopping the compressor.

[0040] The refrigeration side chilled water circulation loop and the test device side cooling water circulation loop are connected by a water tank, the water tank is an open water tank, the open water tank refers to that the inside of the tank body is communicated with the atmospheric environment, the atmospheric pressure inside and outside the water tank is equal, the tank wall plate and the bottom plate only bear the pressure of the liquid stored inside; in the application, the open water tank is selected and installed according to the national standard atlas “Rectangular Water Tank” 12S101, the tank wall plate, the bottom plate and the top plate are all standard modularization, which is convenient for design and installation and is designed into the required volume; the water tank accessories are complete, unified and standardized, the technology is mature, the maintenance is convenient, the manpower and material resources are saved; the water tank is not under pressure, the manufacturing cost is low; the initial investment and the operation and maintenance investment are low, and the reliability is high; the water tank material in the national standard atlas “Rectangular Water Tank” 12S101 is SUS304 stainless steel, which meets the requirements of storing 0.5-1MΩ·cm deionized water; and the open water tank does not need to bear pressure.

[0041] The refrigeration side chilled water circulation loop comprises two pipes of LG2 pipe and LH2 pipe, and is provided with a refrigeration side chilled water drain valve 2, a target type flow switch 3, a first water pipe spherical flexible connection 4A, a second water pipe spherical flexible connection 4B, a bimetallic pointer type thermometer 5, a refrigeration side membrane box type pointer pressure gauge 6, a first water temperature sensor with transmitter 7A, a refrigeration side first butterfly valve 8, a refrigeration side second butterfly valve 8T, a first Y type filter 9A, a first check valve 10, a stop valve 14E, a chilled water pipe adjusting stop valve 14T, a chilled water pipe backflow preventer 15A, a refrigeration side chilled water first circulating water pump 18A, a refrigeration side chilled water second circulating water pump 18B and a pipe type electric heater 20. The refrigeration side chilled water drain valve 2 is arranged on the two pipes of the refrigeration side chilled water circulation loop and is used for draining water in the pipe during maintenance. The target type flow switch 3 is arranged at the water inlet pipe of the air-cooled module unit and is used for identifying the normal operation of the cold source side circulating water. The first water pipe spherical flexible connection 4A is arranged at the water inlet pipe of the air-cooled module unit, and the second water pipe spherical flexible connection 4B is arranged on the two sides of the refrigeration side chilled water first circulating water pump 18A and the refrigeration side chilled water second circulating water pump 18B. The bimetallic pointer type thermometer 5 and the refrigeration side membrane box type pointer pressure gauge 6 are arranged on the refrigeration side chilled water circulation pipe. The bimetallic pointer type thermometer 5 and the refrigeration side membrane box type pointer pressure gauge 6 are both indicating instruments. The bimetallic pointer type thermometer 5 is used for indicating the water temperature of the pipe of the refrigeration side chilled water circulation loop. The refrigeration side membrane box type pointer pressure gauge 6 is used for indicating the pressure of the pipe of the refrigeration side chilled water circulation loop. The refrigeration side chilled water circulation loop is provided with a plurality of bimetallic pointer type thermometers 5 and refrigeration side membrane box type pointer pressure gauges 6, which are used for indicating the temperature and pressure of the pipes at different positions. The first water temperature sensor with transmitter 7A is arranged at the water inlet pipe of the air-cooled module unit. The first water temperature sensor with transmitter 7A is a pipe type water temperature sensor with transmitter. The first water temperature sensor with transmitter 7A is used for starting the air-cooled module unit when the first water temperature sensor with transmitter 7A measures that the inlet water temperature of the air-cooled module unit is higher than the set water temperature value. The refrigeration side first butterfly valve 8 and the refrigeration side second butterfly valve 8T are both arranged on the pipe of the refrigeration side chilled water circulation loop. The refrigeration side first butterfly valve 8 is a chilled water pipe normally open butterfly valve. The refrigeration side second butterfly valve 8T is a chilled water pipe adjusting butterfly valve. The refrigeration side first butterfly valve 8 and the refrigeration side second butterfly valve 8T are both provided with a plurality of valves. The refrigeration side first butterfly valve 8 and the refrigeration side second butterfly valve 8T are used for adjusting the water flow of the air-cooled module unit. The refrigeration side first butterfly valves 8 arranged on different pipes are different in specification. The refrigeration side second butterfly valves 8T arranged on different pipes are also different in specification. The first Y type filter 9A has two. The first Y type filter 9A is arranged at the water pump inlet of the refrigeration side chilled water first circulating water pump 18A and the refrigeration side chilled water second circulating water pump 18B. In an embodiment, the filter screen aperture of the first Y type filter 9A is 4 mm.The first check valve 10 is arranged at the outlet of the circulating water pump for preventing water flow from flowing backward; the backflow preventer 15A is arranged at the LG2 pipeline of the refrigeration side chilled water circulation loop and the horizontal straight pipe section connected with the water tank, and the chilled water pipeline backflow preventer 15A is a device for preventing water flow in the water supply pipeline from flowing backward by adopting a check component. In the present application, the chilled water pipeline backflow preventer 15A is installed in accordance with the standard atlas 12S108-1 "Backflow Preventer Selection and Installation", the first check valve 10 and the chilled water pipeline backflow preventer 15A both have the function of preventing water flow from flowing backward, the backflow preventer has a better engineering actual effect than the check valve, the backflow preventer is arranged at the connection between the refrigeration side chilled water circulation pipeline and the water tank, the check valve is arranged at the outlet of the circulating water pump, cavitation is effectively prevented, all the pipeline is filled with water, the problems of rapid cooling and response of the refrigeration system and the cooling water are solved; the stop valve 14E is arranged at the inlet of the original water pump for cutting off to facilitate maintenance. The pipeline electric heater 20 is arranged on the LH2 pipeline of the cooling water circulation loop, the pipeline electric heater 20 is interlocked with the air-cooled module unit, the pipeline electric heater 20 and the air-cooled module unit of the air-cooled module unit cannot be started at the same time; when the pipeline electric heater 20 operates, the first circulating water pump 18A or the refrigeration side chilled water second circulating water pump 18B must operate normally. The pipeline electric heater 20 is used for heating the water in the water tank 19 when the water temperature is lower than 20 DEG C, so that the water in the water tank meets the requirements; in the present application, the refrigeration side chilled water first circulating water pump 18A and the refrigeration side chilled water second circulating water pump 18B are mutually standby and cannot be started at the same time.

[0042] The test device side cooling water circulation loop comprises two pipes, LQG pipe and LQH pipe, and is provided with a second water drain valve 2A, a third water pipe spherical flexible connection 4, a test device side diaphragm box type pointer pressure gauge 6A, a third water temperature sensor with a transmitter 7, a second Y type filter 9B, a second check valve 10A, a stop valve 14, a water drain stop valve 14A, a cooling water pipe adjusting stop valve 14B, a cooling water backflow preventer 15B, a test device side cooling water first circulation water pump 21A, a test device side cooling water second circulation water pump 21B, a test device side cooling water normally open butterfly valve 22, a test device side cooling water pipe water pump outlet adjusting butterfly valve 22T, a test device side cooling water pipe test device inlet adjusting butterfly valve 23T and a cooling water test device inlet butterfly valve 24.

[0043] The second water temperature sensor with a transmitter 7B, the resistivity sensor with a transmitter 16 and the liquid level sensor with a transmitter 17 are arranged in the water tank 19; when the water temperature sensor 7 in the water tank 19 measures the water temperature at 22 DEG C + / - 2 DEG C, the test device side circulating water pump is allowed to start; the cooling water quality and the resistivity index are 0.5-1 M omega*cm; when the water resistivity sensor 16 in the water tank 19 measures the water resistivity less than 0.5 M omega*cm, the raw water pump and the pure water unit of the water tank pure water unit are started to run to keep the water quality in the water tank through circulation; when the liquid level sensor 17 in the water tank measures the water level lower than the set value, the raw water pump and the pure water unit are started to supplement water; when the water level is higher than the set value, the raw water pump and the pure water unit are stopped.

[0044] In the application, the two independent cooling water circulation loops are open pipe networks, the fluid medium flowing in the open pipe network directly contacts with the atmosphere, and the open liquid pipe network water pump needs to overcome the hydrostatic pressure head caused by height. During the operation and non-operation of the device, the section from the backflow preventer to the water tank inlet is in full water state, the horizontal straight pipe section of the pipe of the refrigeration side chilled water circulation loop and the test device side cooling water circulation loop connected with the water tank is provided with a backflow preventer, and the backflow preventer is installed in accordance with the standard atlas 12S108-1 "backflow preventer selection and installation".

[0045] In the application, the water tank is connected with the open type, and the open type has the following advantages compared with the closed type pipe: (1) the pipe does not need to be pressure-fixed, at least one set of pressure-fixed water supplement device is saved, and the water hammer phenomenon of the pipe is avoided or slowed down; (2) the purified water can be directly supplemented into the water tank, and no additional pressure is needed to be provided; (3) the test device side cooling water and the cold source side chilled water circulation pipes connected with the open type water tank can be independently circulated, and the pressure and temperature of the pipes have little interference; (4) the uniform mixing of the cooling water and the chilled water in the water tank is easy to be realized.

[0046] During the initial operation of the application on a working day, if the water tank temperature is lower than 20 DEG C, the circulating water pump and the tubular electric heater are started to heat the water temperature to 20 DEG C. When the water tank temperature is higher than 21 DEG C, the heating is stopped. If the water tank temperature is higher than 22 DEG C, the circulating water pump and the air-cooled module are started to cool the water temperature to 20 DEG C. When the water tank temperature is 19 DEG C, the cooling is stopped.

[0047] The above technical measures effectively ensure that the cooling water inlet temperature of the tokamak device is 20 + / - 2 DEG C, and the continuous test cooling of the tokamak test device is realized.

[0048] The technical use conditions of the compact and heavy tokamak fusion reactor device in the embodiment of the application are as follows:

[0049] (1) the cooling water inlet temperature of the device water-cooled coil is higher than the ambient wet-bulb temperature;

[0050] (2) The cooling water of the device uses a commercial air-cooled module (the temperature difference between the inlet and outlet water is 5 DEG C, and the temperature fluctuation of the inlet and outlet water is within ±2 DEG C) as the cooling source.

[0051] (3) The operation conditions and requirements of the device are as follows:

[0052] The CTRFR device is powered by an electrolytic capacitor group, the capacitor capacity is 7200F, the charging voltage is up to 120V, the capacitor group supplies power to the electromagnetic coil during the test, the test is ended after 5s, the capacitor is charged again, the test is carried out again after 600s, and the test device is operated for the whole year. The maximum discharge energy of the capacitor group to the CTRFR device is 51.84MJ in 5s, the average heat release rate in 5s is 10.368MW, the average heat release rate in 540.5s is 95.91kW, and the average heat release rate in 600s is 86.40kW.

[0053] The optimal inlet water temperature of the cooling water is 20 DEG C, the maximum allowable change temperature is ±5 DEG C, and the water temperature entering the test equipment should be as constant as possible; when the inlet water temperature of the cooling water is 20 DEG C, the time required for cooling to coils with different initial temperatures under the flow rate specified in Table 1 is shown in Table 1. The maximum outlet water temperature of the cooling water should not be higher than 100 DEG C.

[0054] The cooling water is finally collected into the inlet and outlet water main pipes through a plurality of cooling channels, and the total flow rate of the cooling water is 220.14L / min; the inlet water pressure of the cooling water is 1.0MPa, the outlet water pressure is 0.2MPa, the pressure difference between the inlet and outlet water is 0.8MPa (the end pressure of the cooling water), and the total flow rate of the cooling water and the water flow rate distributed to each cooling channel are required to be accurate.

[0055] The water quality and resistivity index of the cooling water are 0.5-1M Omega center dot cm deionized water.

[0056] Table 1 Detailed parameter table of the device cooling water of the compact type repeated reconnection fusion reactor device of the spherical tokamak

[0057]

[0058] The double-loop cooling device of the water-cooled coil of the tokamak test device has the following use method:

[0059] When running, the following valves are closed: drain valve 2, drain stop valve 14A; the following valves are all open: refrigeration side first butterfly valve 8, refrigeration side second butterfly valve 8T, cooling water pipe regulating stop valve 14B, chilled water pipe regulating stop valve 14T, first stop valve 14E are all open (valve opening 100%); the water flow regulating butterfly valve of the water chiller unit is the second butterfly valve 8T; the cooling water flow regulating butterfly valve of the test device is the cooling water test device inlet butterfly valve 24, the test device side cooling water pipe test device inlet regulating butterfly valve 23T and the drain stop valve 14A. The bimetallic pointer thermometer and the diaphragm box type pointer pressure gauge are indicating instruments. The first water temperature sensor with transmitter 7A and the third water temperature sensor with transmitter 7, the cooling water pipe pressure sensor with transmitter 12 and the flow sensor with transmitter 11 indicate the sensing device and transmit data to the computer for recording. The cooling source side cooling water circulation pipeline (LG2, LH2 pipeline) of the cooling water system and the test device side cooling water circulation pipeline (LQG, LQH) are two independent circuits, and the two independent pipelines (except the backflow preventer to the water tank inlet section) are in full water state through debugging. The cooling water flow through the cooling channel of the test device reaches the requirements of Table 1; the first air-cooled module machine 1A, the second air-cooled module machine 1B and the third air-cooled module machine 1C are allocated flow at 40%, 40% and 20% of the refrigeration side chilled water flow respectively. After the chilled water flow is allocated, the target type flow switch 3 is in the open state.

[0060] When running, if the water temperature of the cooling water tank is higher than 20℃, the test device side first circulating water pump 21A or the test device side second circulating water pump 21B, the refrigeration side first circulating water pump 18A or the refrigeration side second circulating water pump 18B are started at the same time, and the water temperature is first reduced to 20±1℃, and then the test is carried out; if the water temperature of the cooling water tank is lower than 20℃, the test device side first circulating water pump 21A or the test device side second circulating water pump 21B, the refrigeration side first circulating water pump 18A or the refrigeration side second circulating water pump 18B are started at the same time, and the water temperature is first heated to 20±1℃, and then the test is carried out. The electric heating device adopts a pipeline type electric heater 20 arranged on the inlet pipeline of the refrigeration side circulating water pump. The pipeline type electric heater 20 is interlocked with the air-cooled module unit, and the pipeline type electric heater 20 and the air-cooled module unit cannot be started at the same time.

[0061] The source side circulating water pump is normally running, the target type flow switch 3 arranged in the inlet pipeline of the first air-cooled module machine 1A, the second air-cooled module machine 1B and the third air-cooled module machine 1C is opened to identify that the refrigeration side circulating water is normally working, and then the second air-cooled module machine 1B and the third air-cooled module machine 1C of the air-cooled module unit can be started according to the first water temperature sensor with transmitter 7A (higher than the set value) at the inlet of the air-cooled module unit. The first water temperature sensor with transmitter 7A is arranged on the water inlet pipeline of the air-cooled module unit.

[0062] When the water tank second water temperature sensor with transmitter 7B measures the water temperature to be higher than 22℃, the forced air cooling module unit first air cooling module 1A, second air cooling module 1B and third air cooling module 1C are started; the water tank electrical resistivity sensor 16 measures the water electrical resistivity to be less than 0.5MΩ·cm, the raw water pump and the pure water unit are started; the water tank liquid level sensor 17 measures the water level to be lower than the set value, the raw water pump and the pure water unit are started, and when the water level is higher than the set value, the raw water pump and the pure water unit are stopped.

[0063] When the water tank second water temperature sensor with transmitter 7B measures the water temperature to be 22℃±2℃, the first circulating water pump 21A or the second circulating water pump 21B of the test device side cooling water is allowed to start.

[0064] As shown in the accompanying Figure 2 The technical verification of the tokamak device double-loop cooling water device is carried out, and the PF2 coil (the coil with the highest temperature in the test) temperature change value with time is measured for 10 times of CTRFR device test.

[0065] After long time operation, if the cooling water pipe pressure sensor with transmitter 12 measures the cooling water inlet and outlet pressure of the tokamak test device to increase, and the water pipe flow sensor with transmitter 11 measures the cooling water flow of the tokamak test device to decrease, and other valve states remain unchanged, the butterfly valve 24 is closed, the stop valve 14, 14A is opened, and only 21A or 21B is started to implement backwashing.

[0066] The PF2 coil temperature change rule with time in the test device 10 times of test is basically consistent, the highest temperature of the PF2 coil is about 1.90℃ higher than the temperature specified in the accompanying table 1, the coil temperature is higher than 40℃ for a very short time, and the cooling effect is obvious.

Claims

1. Method of using a double circuit cooling device for the water-cooled coil of a Toca-Max test device, characterized in that, The double-circuit cooling device of the water-cooled coil of the Tokam test device comprises a water tank (19), a refrigeration-side chilled water circulation circuit, a test device-side cooling water circulation circuit and an air-cooled module unit; One side of the air-cooled module unit and the refrigeration-side chilled water circulation circuit is connected; the other side of the refrigeration-side chilled water circulation circuit is connected with the test device-side cooling water circulation circuit through the water tank (19); the refrigeration-side chilled water circulation circuit and the test device-side cooling water circulation circuit are independent circuits, and the refrigeration-side chilled water circulation circuit and the test device-side cooling water circulation circuit are provided with independent water pumps; The method comprises the following steps: s1, close the opening water drain valve (2) and the water drain stop valve (14A), and open the refrigeration-side first butterfly valve (8), the refrigeration-side second butterfly valve (8T), the cooling water pipeline adjusting stop valve (14B), the chilled water pipeline adjusting stop valve (14T) and the first stop valve (14E); two independent pipelines are in a full water state through debugging, the chilled water flow is distributed according to requirements, and the target type flow switch (3) is opened; s2, when the water tank water temperature is higher than 20 DEG C during operation, the test device-side first circulating water pump (21A) or the test device-side second circulating water pump (21B), the refrigeration-side chilled water first circulating water pump (18A) or the refrigeration-side chilled water second circulating water pump (18B) are started, the water temperature is first reduced to 20 DEG C ± 1 DEG C, and then the test is performed; when the cooling water tank water temperature is lower than 20 DEG C, the first circulating water pump (21A) or the second circulating water pump (21B), the refrigeration-side chilled water first circulating water pump (18A) or the refrigeration-side chilled water second circulating water pump (18B) are started, the water temperature is first heated to 20 DEG C ± 1 DEG C, and then the test is performed; s3, when the second water temperature sensor with a transmitter (7B) in the water tank measures that the water temperature is higher than 22 DEG C, the forced air-cooled module unit is started; when the water resistivity sensor (16) in the water tank measures that the water resistivity is less than 0.5 MΩ·cm, the raw water pump and the pure water unit are started; when the liquid level sensor (17) in the water tank measures that the water liquid level is lower than the set value, the raw water pump and the pure water unit are started, and when the water liquid level is higher than the set value, the raw water pump and the pure water unit are stopped; s4, when the second water temperature sensor with a transmitter (7B) in the water tank measures that the water temperature is 22 DEG C ± 2 DEG C, the test device-side cooling water first circulating water pump (21A) or the test device-side cooling water second circulating water pump (21B) is allowed to be started.

2. The method of using a dual loop cooling system for a tokamaki test device water cooled coil as defined in claim 1, wherein, The water tank (19) is an open water tank.

3. The method of using a dual loop cooling system for a tokamaki test device water cooled coil as defined in claim 1, wherein, The refrigeration-side chilled water circulation circuit and the test device-side cooling water circulation circuit are open pipelines.

4. The method of using a dual loop cooling system for a tokamaki test device water cooled coil as defined in claim 1, wherein, The air-cooled module unit comprises a first air-cooled module (1A), a second air-cooled module (1B) and a third air-cooled module (1C), and the first air-cooled module (1A), the second air-cooled module (1B) and the third air-cooled module (1C) are connected in parallel.

5. The method of using a dual loop cooling system for a tokamak test device water cooled coil as defined in claim 4, wherein, The cold capacities of the first air-cooled module (1A), the second air-cooled module (1B) and the third air-cooled module (1C) are configured in a gradient.

6. The method of using a dual loop cooling system for a tokamaki test device water cooled coil as defined in claim 1, wherein, The pipeline of the refrigeration-side chilled water circulation circuit is connected with the horizontal straight pipe section of the water tank, and a chilled water pipeline backflow preventer (15A) is arranged at the connection position. The pipeline of the test device-side cooling water circulation circuit is connected with the horizontal straight pipe section of the water tank, and a cooling water backflow preventer (15B) is arranged at the connection position.

7. The method of using a dual loop cooling system for a tokamak experiment device water cooled coil as defined in claim 1, wherein, The first water temperature sensor with transmitter (7A) is arranged on the water inlet pipe of the first air-cooled module unit (1A), the second air-cooled module unit (1B) and the third air-cooled module unit (1C) in the air-cooled module unit.

8. The method of using the dual loop cooling system for the Tokamaks experimental device water cooled coils of claim 1, characterized by, The refrigeration side chilled water first circulating water pump (18A) and the refrigeration side chilled water second circulating water pump (18B) are arranged on the refrigeration side chilled water circulating loop, the refrigeration side chilled water first circulating water pump (18A) and the refrigeration side chilled water second circulating water pump (18B) are standby for each other and are not started at the same time; the test device side chilled water first circulating water pump (21A) and the test device side chilled water second circulating water pump (21B) are arranged on the test device side chilled water circulating loop, the test device side chilled water first circulating water pump (21A) and the test device side chilled water second circulating water pump (21B) are standby for each other and are not started at the same time.

9. The method of using a dual loop cooling system for a tokamak experiment device water cooled coil as defined in claim 8, wherein, The pipeline type electric heater (20) is arranged on the pipeline of the refrigeration side chilled water circulating loop, the pipeline type electric heater (20) is interlocked with the air-cooled module unit, the pipeline type electric heater (20) and the first air-cooled module unit (1A), the second air-cooled module unit (1B) and the third air-cooled module unit (1C) of the air-cooled module unit cannot be started at the same time; when the pipeline type electric heater (20) is running, the first circulating water pump (18A) or the refrigeration side chilled water second circulating water pump (18B) must be normally running.

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