Test system and test method for verifying the forward injection capability of siphon breaking devices under high pressure

Abstract

The present invention provides a test system and a test method for verifying the forward injection capability of a siphon destroying device under high pressure. The test system includes a siphon destroying device, a high-pressure test tank, an inlet flow meter, and an outlet flow meter. The siphon destroying device is arranged in the high-pressure test tank. An inlet flow meter is arranged at the first port of the siphon destroying device, and the inlet flow meter is used to obtain the flow rate of the working medium entering the high-pressure test tank. An outlet flow meter is arranged at the second port of the siphon destroying device, and the outlet flow meter is used to obtain the flow rate of the working medium flowing out of the high-pressure test tank. The working medium can flow into the siphon destroying device from the first port of the siphon destroying device and be discharged from the second port of the siphon destroying device. The drainage ratio of the siphon destroying device is obtained through the inlet flow meter and the outlet flow meter, and then the forward injection capability of the siphon destroying device under high pressure is obtained. The above test system can verify the forward injection capability of the siphon destroying device under high pressure conditions.

Description

Technical Field

[0001] The invention relates to a siphon destroying device for a heating reactor, and in particular to a test system and a test method for verifying the forward injection capability of the siphon destroying device under high pressure. Background Art

[0002] When starting up an integrated natural circulation small reactor, hot water needs to be injected from the outside to bring the reactor to a state close to that of stable operation. The injection system is inserted from the top of the RPV (Reactor Pressure Vessel) to the RPV core. This inlet pipe is the lowest pipe. If a breach occurs at the RPV outlet of the pipe, a low-level breach will be formed. Under the action of siphon, the low-level breach causes the system liquid level to drop rapidly and continuously, and the injected supercooled water may also flow out of the system through the breach. Therefore, in order to mitigate the serious consequences that may be caused by a low-level breach, a siphon breaking device needs to be installed on the inlet pipe of the startup system.

[0003] When the injection pipe is injected forward, the injection fluid is injected from the off-pillar pipe, accelerated by the nozzle and enters the mixing section. Under the action of the Bernoulli principle, the working fluid inside the RPV with lower pressure is sucked into the mixing section from the suction port. After the injected high-temperature liquid and the sucked working fluid are fully mixed in the mixing section, they enter the diffusion section, further reducing the flow rate and increasing the pressure. Through reasonable design, the fluid entering the mixing section from the suction port can be much lower than the fluid entering the receiving chamber from the nozzle, and the flow will not be interrupted at the break between the nozzle and the suction port.

[0004] In the current research and design process, the simulation of the siphon breaking device mainly relies on CFD (Computational Fluid Dynamics), and the geometric structure of the siphon breaking device model is adjusted to make its design meet the requirements. However, the calculation of CFD depends largely on the existing test results for correction. The different models and parameters set in CFD are theoretical choices. In the actual injection process, more factors need to be considered. Therefore, the test situation can truly reflect the real effect of the siphon breaking device. The test results can be used to verify the calculation results of CFD to ensure the optimization of the selection of different CFD parameters.

[0005] However, there is currently no test system or corresponding test data for simulating the forward injection of a siphon breaking device under high-pressure conditions. In addition, there are many design parameters and factors that affect the siphon breaking performance in the siphon breaking device. As a result, siphon breaking devices of different specifications have different forward injection capabilities under high pressure, which brings difficulties to the subsequent system program model implantation, program verification and CFD simulation program development. Summary of the invention

[0006] The object of the present invention is to provide a test system and a test method for verifying the forward injection capability of a siphon breaking device under high pressure, which can verify the forward injection capability of a siphon breaking device under high pressure conditions.

[0007] One aspect of the present invention provides a test system for verifying the forward injection capability of a siphon breaking device under high pressure, comprising a siphon breaking device, a high pressure test tank, an inlet flow meter and an outlet flow meter; wherein the siphon breaking device is arranged in the high pressure test tank; the first port of the siphon breaking device is provided with the inlet flow meter, and the inlet flow meter is used to obtain the flow rate of the working medium entering the high pressure test tank; the second port of the siphon breaking device is provided with the outlet flow meter, and the outlet flow meter is used to obtain the flow rate of the working medium flowing out of the high pressure test tank; the working medium can flow into the siphon breaking device from the first port of the siphon breaking device and be discharged from the second port of the siphon breaking device, and the drainage ratio of the siphon breaking device is obtained through the inlet flow meter and the outlet flow meter, thereby obtaining the forward injection capability of the siphon breaking device under high pressure.

[0008] In one embodiment, the first port of the siphon breaking device is connected to a test injection pipeline, and the second port of the siphon breaking device is connected to a test discharge pipeline; the inlet flow meter is arranged on the test injection pipeline, and the outlet flow meter is arranged on the test discharge pipeline.

[0009] In one embodiment, the test system also includes a circulation pump; the first end of the circulation pump is connected to the test injection pipeline, and the second end of the circulation pump is connected to the test discharge pipeline, and the circulation pump provides a power source for the test loop circulation formed by the test injection pipeline, the high-pressure test tank and the test discharge pipeline.

[0010] In one embodiment, a heater is provided at a position downstream of the circulation pump on the test injection pipeline, and the heater is used to adjust the temperature of the working fluid injected into the high-pressure test tank.

[0011] In one embodiment, the test system further includes a downflow branch; a first end of the downflow branch is connected to the test injection pipeline, a second end of the downflow branch is connected to the test discharge pipeline, and the downflow branch is used to depressurize the test circuit.

[0012] In one embodiment, a downstream heat exchanger and a downstream valve group are provided on the downstream branch; the downstream valve group is provided at a downstream position of the downstream heat exchanger on the downstream branch.

[0013] In one embodiment, the test system also includes an upper charging branch; the first end of the upper charging branch is connected to the second end of the lower discharge branch, and the second end of the upper charging branch is connected to the test discharge pipeline; the upper charging branch is provided with a water tank and an upper charging pump, and the working fluid is replenished to the test circuit through the upper charging pump.

[0014] In one embodiment, the test system also includes a cooling branch; the first end of the cooling branch is connected to the test injection pipeline, and the second end of the cooling branch is connected to the test discharge pipeline; the cooling branch is provided with a heat exchange device, and the heat exchange device can cool the working fluid discharged through the test discharge pipeline.

[0015] In one embodiment, the test system further includes a pressure stabilizing branch; the pressure stabilizing branch is provided with an air supply device; the pressure stabilizing branch is connected to the high-pressure test tank, and the air supply device provides stable pressure for the high-pressure test tank.

[0016] In one embodiment, the suction port of the siphon breaking device is provided with a temperature sensor for monitoring the operating temperature of the corresponding position; and / or the suction port of the siphon breaking device is provided with a pressure sensor for monitoring the operating pressure of the corresponding position.

[0017] Another aspect of the present invention provides a test method for verifying the forward injection capability of a siphon destroying device under high pressure, which is applied to a test system for verifying the forward injection capability of a siphon destroying device under high pressure as described in any one of the above embodiments; the test method comprises: controlling the working fluid to flow into the first port of the siphon destroying device in the high pressure test tank and to be discharged from the second port of the siphon destroying device; obtaining data from an inlet flow meter and an outlet flow meter to obtain the drainage ratio of the siphon destroying device; and obtaining the forward injection capability of the siphon destroying device under high pressure based on the drainage ratio.

[0018] The test system for verifying the forward injection capability of the siphon breaking device under high pressure of the present invention uses an inlet flow meter and an outlet flow meter to obtain the drainage ratio of the siphon breaking device, so as to study the forward injection capability of the siphon breaking device for starting the heating pipeline under high pressure conditions, and then evaluate and reasonably design the siphon breaking device, so as to verify the influence of the siphon breaking device structure with different design parameters under different thermal-hydraulic parameter conditions on the siphon breaking through the test, and provide a basis for the subsequent system program model implantation, program verification and CFD simulation program development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0020] Figure 1is a schematic diagram of an embodiment of a test system for verifying the forward injection capability of a siphon breaking device under high pressure according to the present invention;

[0021] Figure 2 yes Figure 1 The structural schematic diagram of the siphon breaking device shown;

[0022] Figure 3 1 is a flow chart of an embodiment of a test method for verifying the forward injection capability of a siphon breaking device under high pressure according to the present invention. DETAILED DESCRIPTION

[0023] In the current research and design process, the simulation of the siphon breaking device mainly relies on CFD, and the geometric structure of the model of the siphon breaking device is adjusted to make its design meet the requirements. However, the calculation of CFD depends largely on the existing test results for correction. The different models and parameters set in CFD are theoretical choices. In the actual injection process, more factors need to be considered. For example, whether the nozzle of the siphon breaking device is aligned with the mixing section, installation error, manufacturing tolerance, etc., the actual temperature of the liquid is not constant, and the surface roughness of the pipeline may be different from the value selected in the calculation process. Therefore, the test situation can truly reflect the real effect of the siphon breaking device. The test results can be used to check the calculation results of CFD to ensure the optimization of the selection of different parameters of CFD. However, due to the manufacturing cycle and cost reasons, the siphon breaking device may have dozens of different design parameters in the design process, and it cannot be completely simulated The actual proportion of the actual reactor is processed and manufactured. Therefore, it is necessary to adjust the design of the siphon breaking device with the help of CFD calculation results and obtain an optimal design.

[0024] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations within the scope of the appended claims and their equivalents.

[0025] As used herein, the terms "upstream" and "downstream" refer to the relative direction of the flow of the working fluid in the working fluid path. For example, "upstream" refers to the direction from which the working fluid flows, and "downstream" refers to the direction to which the working fluid flows.

[0026] Figure 1The test system for verifying the forward injection capability of the siphon breaking device 7 under high pressure of the present invention is shown. Figure 1 As shown, the test system includes a siphon destruction device 7, a high-pressure test tank 6, an inlet flowmeter 5 and an outlet flowmeter 8. Among them, the high-pressure test tank 6 is used to simulate RPV (Reactor Pressure Vessel) and can withstand certain pressure and temperature. The design pressure of the high-pressure test tank 6 can be selected as 12MPa. The siphon destruction device 7 is arranged in the high-pressure test tank 6. The first port of the siphon destruction device 7 is provided with an inlet flowmeter 5, and the inlet flowmeter 5 is used to obtain the flow rate of the working medium entering the high-pressure test tank 6. The second port of the siphon destruction device 7 is provided with an outlet flowmeter 8, and the outlet flowmeter 8 is used to obtain the flow rate of the working medium flowing out of the high-pressure test tank 6. The working medium can flow into the siphon destruction device 7 from the first port of the siphon destruction device 7 and be discharged from the second port of the siphon destruction device 7. The inlet flowmeter 5 and the outlet flowmeter 8 can respectively measure the flow rate flowing into the siphon destruction device 7 and the flow rate flowing out of the siphon destruction device 7. The liquid flow rate entrained by the siphon breaking device 7 from the high pressure test tank 6 is obtained through the inlet flow meter 5 and the outlet flow meter 8, so as to obtain the drainage ratio of the siphon breaking device 7, and then verify and evaluate the forward injection capability of the siphon breaking device 7 under high pressure.

[0027] The test system for verifying the forward injection capability of the siphon destroying device 7 under high pressure of the present invention utilizes the inlet flow meter 5 and the outlet flow meter 8 to obtain the drainage ratio of the siphon destroying device 7, so as to study the forward injection capability of the siphon destroying device 7 for starting the heating pipeline under high pressure conditions, and then evaluate and reasonably design the siphon destroying device 7, so as to verify the influence of the siphon destroying device 7 structure with different design parameters under different thermal-hydraulic parameter conditions on the siphon destruction through experiments, and provide a basis for the subsequent system program model implantation, program verification and CFD simulation program development.

[0028] The forward injection capability of the siphon destroying device 7 is mainly evaluated by the parameter "drainage ratio". The drainage ratio refers to the ratio of the mass flow rate at the outlet of the siphon destroying device 7 to the mass flow rate at the inlet of the siphon destroying device 7. For example: if the outlet flow rate is 1050kg / h and the inlet flow rate is 1000kg / h, the drainage ratio is 1050 / 1000=1.05. The ratio of the inlet and outlet flow rates can be obtained in real time through the inlet flow meter 5 and the outlet flow meter 8. If the drainage ratio is less than 1 or the drainage ratio is greater than 1.1, it is considered that the siphon destroying device 7 under the design parameter conditions does not meet the design requirements, and the design can be further optimized.

[0029] like Figure 1As shown, the siphon breaking device 7 is vertically fixed in the high pressure test tank 6. The siphon breaking device 7 can be fixed in the high pressure test tank 6 by a fixing bracket (not shown).

[0030] The structure of the siphon destroying device 7 of the present invention is as follows Figure 2 As shown, the siphon destroying device 7 includes a first port 7-1, a nozzle 7-2, a suction port 7-3, a mixing section 7-4, a diffusion section 7-5 and a second port 7-6 from top to bottom. Among them, the first port 7-1 is the entrance of the siphon destroying device 7, the suction port 7-3 is in a trumpet shape, and the second port 7-6 is the outlet of the siphon destroying device 7. When the injection pipeline is injected forward, that is, when the injection fluid is injected from the off-pillar pipeline, it enters the mixing section 7-4 after being accelerated by the nozzle 7-2. Under the action of the Bernoulli principle, the working fluid inside the RPV with a lower pressure is sucked into the mixing section 7-4 from the suction port 7-3. After the injected high-temperature liquid and the sucked working fluid are fully mixed in the mixing section 7-4, they enter the diffusion section 7-5, further reducing the flow rate and increasing the pressure. Through reasonable design, the fluid entering the receiving chamber (i.e., the mixing section 7-4) from the suction port 7-3 can be much lower than the fluid entering the receiving chamber from the nozzle 7-2, and the flow will not be interrupted at the break between the nozzle 7-2 and the receiving chamber.

[0031] like Figure 1 As shown, the first port 7-1 of the siphon breaking device 7 is connected to the test injection pipeline 110, and the second port 7-6 of the siphon breaking device 7 is connected to the test discharge pipeline 120. The inlet flow meter 5 is arranged on the test injection pipeline 110, and the outlet flow meter 8 is arranged on the test discharge pipeline 120, and both are located outside the high pressure test tank 6.

[0032] The test system of the present invention needs to verify the forward injection capability of the siphon destroying device 7 with different design parameters under high pressure. Therefore, the siphon destroying device 7 is detachably connected. Specifically, the first port 7-1 of the siphon destroying device 7 and the test injection pipeline 110 can be threadedly connected, and the second port 7-6 of the siphon destroying device 7 and the test injection pipeline 110 can be threadedly connected, so that the test system of the present invention has the characteristics of easy replacement, large number of single tests, flexible measurement quantity, high accuracy, etc.

[0033] like Figure 1 As shown, the test system further includes a circulation pump 1. The first end of the circulation pump 1 is connected to the test injection pipeline 110, and the second end of the circulation pump 1 is connected to the test discharge pipeline 120. The circulation pump 1 provides a power source for the circulation of the working medium in the test loop 100 formed by the test injection pipeline 110, the high-pressure test tank 6 and the test discharge pipeline 120.

[0034] Test loop 100 Figure 1The test loop 100 is shown as the main loop, and the working fluid circulates through the circulation pump 1-test injection pipeline 110-inlet flow meter 5-high pressure test tank 6-first port (7-1) of the siphon breaking device 7-second port (7-6) of the siphon breaking device 7-outlet flow meter 8-test discharge pipeline 120-circulation pump 1 to form the test loop 100.

[0035] A heater 4 is provided downstream of the circulating pump 1 on the test injection pipeline 110. The heater 4 is used to adjust the temperature of the working fluid injected into the high-pressure test tank 6, thereby raising the temperature and pressure of the test system (mainly the test loop 100) to the isothermal and isobaric environment of the nuclear power plant prototype, so that the test system of the present invention can carry out simulation tests in an environment of temperature and pressure 1:1.

[0036] like Figure 1 As shown, a pump outlet check valve 35, a pump outlet flow regulating valve 2 and a pump outlet flow meter 3 are also provided at the downstream position of the circulation pump 1 on the test injection pipeline 110 and the upstream position of the heater 4. An inlet valve group 23 is also provided at the downstream position of the heater 4 on the test injection pipeline 110 to adjust the flow of the working medium entering the high-pressure test tank 6. A pre-pump stop valve 24 is also provided between the test discharge pipeline 120 and the circulation pump 1.

[0037] Continue to refer Figure 1 An outlet valve group 20 is also provided at a downstream position of the outlet flow meter 8 on the test discharge pipeline 120 .

[0038] In one embodiment, the test system further includes a pressure stabilizing branch 200. The pressure stabilizing branch 200 is provided with a gas supply device. The gas supply device may be a nitrogen bottle group 33. The top of the high-pressure test tank 6 is connected to the nitrogen bottle group 33. When the test discharge pipeline 120 entrains the water in the pipe through the nozzle of the siphon destroying device 7, the pressure in the high-pressure test tank 6 can be maintained in a relatively stable state through the nitrogen bottle group 33. The pressure stabilizing branch 200 is connected to the high-pressure test tank 6, and the nitrogen bottle group 33 provides a stable pressure for the high-pressure test tank 6. A pressure stabilizing regulating valve 25 is also provided upstream of the nitrogen bottle group 33 on the pressure stabilizing branch 200 for controlling the gas supply from the nitrogen bottle group 33 to the high-pressure test tank 6.

[0039] The high pressure test tank 6 is also provided with an exhaust valve 26 and a drain valve 34. When the pressure in the high pressure test tank 6 is too high, the gas in the tank can be discharged through the exhaust valve 26. The drain valve 34 can discharge the working medium in the high pressure test tank 6.

[0040] Continue to refer Figure 1The test system further includes a bypass branch 300, on which a bypass branch flow meter 15, a bypass branch flow regulating valve 16, a regulator 17 and a regulator branch valve group 22 are arranged. The pressure of the test loop 100 can be determined by the change of the liquid level in the regulator 17. By setting the pressure stabilizing branch 200 and the bypass branch 300, the pressure of the test system can be kept relatively stable.

[0041] In one embodiment, the test system further includes a downflow branch 400. A first end of the downflow branch 400 is connected to the test injection pipeline 110, and a second end of the downflow branch 400 is connected to the test discharge pipeline 120. The downflow branch 400 is used to depressurize the test loop 100. Further, a downflow heat exchanger 18 and a downflow valve group 19 are provided on the downflow branch 400. The downflow valve group 19 is provided at a downstream position of the downflow heat exchanger 18 on the downflow branch 400.

[0042] like Figure 1 As shown, an inlet stop valve 27 is provided at an upstream position of the downstream heat exchanger 18 on the downstream branch 400, and an outlet stop valve 28, a downstream valve group 19 and a downstream flow meter 14 are provided at a downstream position.

[0043] In one embodiment, the test system further includes an upper charging branch 500. The first end of the upper charging branch 500 is connected to the second end of the lower discharge branch 400, and the second end of the upper charging branch 500 is connected to the test discharge pipeline 120. The upper charging branch 500 is provided with a water tank 13 and an upper charging pump 12, and the upper charging pump 12 is used to replenish the working medium to the test circuit 100. The high-temperature and high-pressure water in the lower discharge branch 400 flows into the water tank 13 after pressure relief. The upper charging pump 12 can be optionally a plunger pump.

[0044] like Figure 1 As shown, a charging branch check valve 32 , a charging flowmeter 11 and a charging branch regulating valve 29 are also provided at a downstream position of the charging pump 12 on the charging branch 500 .

[0045] The charging branch 500 can adjust the water volume of the test system under high temperature and high pressure environment. The water volume refers to the total volume of the medium in the test loop 100 of the entire test system. If the total volume is too large, the pressure will be too high, which does not meet the test parameter setting. If the total volume of the medium is too small, the pressure will be too low and may cause pump cavitation, which does not meet the test design requirements.

[0046] The present invention sets an upper charging branch 500 and a lower discharge branch 400 in the test loop 100, and can adjust the pressure and water filling amount of the test loop 100. If the loop pressure is too high, the pressure can be released through the lower discharge branch 400. If the loop pressure is too low, water can be added to the test loop 100 through the upper charging branch 500, and the power of the heater 4 of the test loop 100 can be adjusted to increase the pressure of the test loop 100.

[0047] In one embodiment, the test system further includes a cooling branch 600. A first end of the cooling branch 600 is connected to the test injection pipeline 110, and a second end of the cooling branch 600 is connected to the test discharge pipeline 120. The cooling branch 600 is provided with a heat exchange device 9, which can cool the working fluid discharged through the test discharge pipeline 120.

[0048] like Figure 1 As shown, a cooling branch flow meter 10 and a cooling branch valve group 21 are also provided at the upstream position of the heat exchange device 9 on the cooling branch 600 .

[0049] In one embodiment, the suction port 7-3 of the siphon destroying device 7 is provided with a temperature sensor (not shown) for monitoring the operating temperature at the corresponding position. The suction port 7-3 of the siphon destroying device 7 is provided with a pressure sensor (not shown) for monitoring the operating pressure at the corresponding position. By monitoring the operating parameters at different positions of the siphon destroying device 7 during the test, the performance of the siphon destroying device 7 can be evaluated.

[0050] Figure 3 The test method of the present invention for verifying the forward injection capability of the siphon breaking device 7 under high pressure is shown. The test method of the present invention is applied to the test system for verifying the forward injection capability of the siphon breaking device 7 under high pressure as described in any of the above embodiments.

[0051] like Figure 3 As shown, the test method of the present invention includes steps S100 to S300:

[0052] In step S100 , the working medium is controlled to flow into the first port 7 - 1 of the siphon breaking device 7 in the high pressure test tank 6 , and is discharged from the second port 7 - 6 of the siphon breaking device 7 .

[0053] In step S200 , data of the inlet flow meter 5 and the outlet flow meter 8 are acquired to obtain the drainage ratio of the siphon breaking device 7 .

[0054] In step S300, the forward injection capability of the siphon destroying device 7 under high pressure is obtained according to the drainage ratio.

[0055] Combination Figure 1 , Figure 2As well as the above embodiment, based on the above steps S100 to S300, the test method of the present invention is specifically as follows:

[0056] The flow rate entering the high-pressure test tank 6 and flowing through the first port 7-1 of the siphon destroying device 7 is adjusted by the pump outlet flow regulating valve 2; the inlet water temperature entering the high-pressure test tank 6 and flowing through the siphon destroying device 7 is adjusted by adjusting the heating power of the heater 4; and the ratio of the inlet and outlet flow rates of the high-pressure test tank 6 can be calculated in combination with the outlet flow meter 8 and the inlet flow meter 5 of the high-pressure test tank 6, and then the drainage ratio of the siphon destroying device 7 is obtained. According to the drainage ratio and drainage ratio design requirements of the siphon destroying device 7 obtained, the performance of the siphon destroying device 7 is evaluated to improve or optimize the design of the siphon destroying device 7. As mentioned above, if the drainage ratio is less than 1 or the drainage ratio is greater than 1.1, it is considered that the siphon destroying device 7 under the design parameter conditions does not meet the design requirements, so that the design can be further optimized. That is to say, in the verification test of the forward injection capability of the siphon destroying device 7 by the test system of the present invention, the drainage ratio design requirement of the siphon destroying device 7 is between 1 and 1.1.

[0057] When the high-temperature water flowing out of the high-pressure test tank 6 flows into the test loop 100, it eventually flows back to the inlet of the circulation pump 1, thus completing a complete cycle.

[0058] During the test, the pressure inside the high pressure test tank 6 is kept stable by the nitrogen cylinder group 33 connected thereto.

[0059] During the test, if the pressure of the test loop 100 is too high, the pressure of the test loop 100 can be reduced through the downstream branch 400. The high-temperature and high-pressure water in the test loop 100 is cooled by the downstream heat exchanger 18, and then passes through the regulating valve group for two-stage pressure reduction, and then flows back to the pure water tank 13. The downstream flow of the test loop 100 can be measured in real time by the downstream loop flowmeter.

[0060] If the pressure of the test loop 100 is too low and the liquid level in the regulator 17 is lower than the set liquid level, it indicates that the water content of the test loop 100 is insufficient. At this time, water can be added to the test loop 100 to a normal liquid level through the charging pump 12. During the charging, at least one of the regulating valve 30 and the stop valve 31 remains open, so that the test loop 100 is at the pressure level set for the test condition.

[0061] If the temperature of the test loop 100 is lower than the test required temperature, the heating power of the heater 4 is adjusted to increase the water temperature of the test loop 100.

[0062] If the water temperature of the test loop 100 is too high, turn off the heater 4 and open the cooling branch valve group 21. At this time, the high-temperature loop water will enter the cooling branch 600 and flow through the heat exchange device 9 of the cooling branch 600, thereby reducing the internal water temperature of the test loop 100 and maintaining the temperature of the test loop 100 at the temperature set for the test condition.

[0063] Therefore, the test system of the present invention can adjust the temperature and pressure of the test loop 100 to a specified state through the loop heater 4 according to the test condition setting under the feedback of the temperature sensor (not shown) and the pressure sensor (not shown) of the test loop 100. If the system water temperature is too high, the water temperature of the test loop 100 can be cooled down by the heat exchange device 9 in the cooling branch 600; if the water temperature is too low, the power of the heater 4 is adjusted to heat the water in the test loop 100 to a specified temperature, thereby accurately adjusting the temperature and pressure of the simulated test loop 100, studying the performance of the forward injection of the siphon breaking device 7 under different initial temperature and pressure conditions, and optimizing or improving the performance of the siphon breaking device 7.

[0064] The test system of the present invention can be used to simulate the startup heating pipeline of a nuclear power plant to test and verify the forward injection capability of the siphon destruction device 7. The forward injection flow and temperature of the simulated startup heating pipeline can be accurately adjusted to ensure as much as possible that the forward injection capability of the startup heating pipeline siphon destruction device 7 is studied under the conditions of the prototype power plant.

[0065] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A test system for verifying the forward injection capability of a siphon breaking device under high pressure, characterized in that: It includes a siphon breaking device, a high pressure test tank, an inlet flow meter and an outlet flow meter; wherein, The siphon breaking device is arranged in the high pressure test tank; The first port of the siphon breaking device is provided with the inlet flow meter, and the inlet flow meter is used to obtain the flow rate of the working medium entering the high-pressure test tank; The second port of the siphon breaking device is provided with the outlet flow meter, and the outlet flow meter is used to obtain the flow rate of the working medium flowing out of the high-pressure test tank; The working fluid can flow into the siphon breaking device from the first port of the siphon breaking device and be discharged from the second port of the siphon breaking device. The drainage ratio of the siphon breaking device is obtained through the inlet flow meter and the outlet flow meter, thereby obtaining the forward injection capacity of the siphon breaking device under high pressure.

2. The test system according to claim 1, characterized in that: The first port of the siphon breaking device is connected to a test injection pipeline, and the second port of the siphon breaking device is connected to a test discharge pipeline; The inlet flow meter is arranged on the test injection pipeline, and the outlet flow meter is arranged on the test discharge pipeline.

3. The test system according to claim 2, characterized in that: The test system also includes a circulation pump; The first end of the circulation pump is connected to the test injection pipeline, and the second end of the circulation pump is connected to the test discharge pipeline. The circulation pump provides a power source for the circulation of the working fluid in the test loop formed by the test injection pipeline, the high-pressure test tank and the test discharge pipeline.

4. The test system according to claim 3, characterized in that: A heater is provided at a position downstream of the circulation pump on the test injection pipeline, and the heater is used to adjust the temperature of the working fluid injected into the high-pressure test tank.

5. The test system according to claim 3 or 4, characterized in that: The test system also includes a downflow branch; The first end of the downflow branch is connected to the test injection pipeline, the second end of the downflow branch is connected to the test discharge pipeline, and the downflow branch is used to relieve the pressure of the test circuit.

6. The test system according to claim 5, characterized in that: The downstream branch is provided with a downstream heat exchanger and a downstream valve group; The discharge valve group is arranged at a downstream position of the discharge heat exchanger on the discharge branch line.

7. The test system according to claim 5, characterized in that: The test system also includes a charging branch; The first end of the upper charging branch is connected to the second end of the lower discharge branch, and the second end of the upper charging branch is connected to the test discharge pipeline; The charging branch is provided with a water tank and a charging pump, and the working fluid is replenished to the test circuit through the charging pump.

8. The test system according to claim 3 or 4, characterized in that: The test system also includes a cooling branch; The first end of the cooling branch is connected to the test injection pipeline, and the second end of the cooling branch is connected to the test discharge pipeline; The cooling branch is provided with a heat exchange device, and the heat exchange device can cool the working medium discharged through the test discharge pipeline.

9. The test system according to any one of claims 1 to 4, characterized in that: The test system also includes a voltage stabilizing branch; The voltage stabilizing branch is provided with an air supply device; The pressure stabilizing branch is connected to the high-pressure test tank, and the gas supply device provides stable pressure for the high-pressure test tank.

10. The test system according to any one of claims 1 to 4, characterized in that: The suction port of the siphon destroying device is provided with a temperature sensor for monitoring the operating temperature at the corresponding position; and / or The suction port of the siphon destroying device is provided with a pressure sensor for monitoring the operating pressure at the corresponding position.

11. A test method for verifying the forward injection capability of a siphon breaking device under high pressure, characterized in that: A test system for verifying the forward injection capability of a siphon breaking device under high pressure as described in any one of claims 1 to 10; The test method includes: Controlling the working fluid to flow into the first port of the siphon breaking device in the high-pressure test tank and discharge from the second port of the siphon breaking device; Obtaining data from an inlet flow meter and an outlet flow meter to obtain a drainage ratio of the siphon breaking device; According to the drainage ratio, the forward injection capability of the siphon breaking device under high pressure is obtained.

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