Testing device for degassing factor of degassing tower

Abstract

The invention discloses a device for testing a degassing factor of a degassing tower. The device comprises a to-be-tested degassing tower; the feeding pipeline is connected with a degassing tower to be detected; the simulated feed liquid sampling device is arranged on the feeding pipeline; the discharging pipeline is connected with a degassing tower to be detected; the degassed feed liquid sampling device is arranged on the discharge pipeline; the buffer tank can supplement simulation feed liquid, is connected with the discharge pipeline and the feed pipeline, and forms a circulation loop with the degassing tower to be tested. And according to the concentration requirements of the simulated feed liquid on different gases, the two gases are separately filled, so that the gas concentration in the simulated feed liquid is controllable. The constant trace gas filling pipeline is connected with the discharging pipeline and is used for filling the first type of simulation gas; a trace gas filling pipeline is connected with the auxiliary batching tank, and is used for filling a second type of simulation gas and preparing a trace gas concentrated solution; the auxiliary batching tank is connected with a trace gas concentrated solution pipeline; the trace gas concentrated solution pipeline is provided with a metering pump; and the trace gas concentrated solution pipeline is connected with the feeding pipeline and is used for filling trace gas concentrated solution.

Description

Technical Field

[0001] The present invention belongs to the technical field of radioactive waste treatment, and particularly relates to a test device for the degassing factor of a degassing tower for degassing the primary coolant of a pressurized water reactor nuclear power plant. Background Technique

[0002] Before the recycled liquid of the primary loop of a pressurized water reactor nuclear power plant is recycled, it is necessary to use a degassing tower to remove hydrogen and fission gases (mainly radioactive isotopes of krypton and xenon); before opening the reactor pressure vessel cover, it is also necessary to use the degassing tower to circulate and degas to remove hydrogen and reduce radioactivity.

[0003] The degassing performance of the degassing tower for a certain gas is characterized by the degassing coefficient. The degassing coefficient is the ratio of the gas concentration of the feed and product liquids at the inlet and outlet of the degassing tower.

[0004] To ensure the reliability of the degassing device, before a newly designed or improved design is put into use, it is necessary to conduct a degassing performance test, that is, to detect the gas concentration in the inlet and outlet liquids of the degassing tower under normal operating conditions to calculate the degassing coefficient.

[0005] The concentration requirements of the simulated feed liquid used in the test for different gases are different, with a difference of up to 5 to 6 orders of magnitude, and it is difficult to uniformly configure the simulated feed liquid.

[0006] In order to reduce the reactor shutdown time and improve economic efficiency, the degassing tower is usually designed with a large flow rate. Therefore, the simulated feed liquid processed in a single degassing performance test can reach hundreds of tons, and the consumption is large.

[0007] In addition, there is a problem of flow matching between the upstream and downstream during the use of the degassing tower, and the flow rate and temperature of the production feed liquid may change. The existing test devices have poor flexibility and controllability. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a test device for the degassing factor of a degassing tower according to the above deficiencies in the prior art. According to the concentration requirements of different gases for the simulated feed liquid, separate injection is carried out to make the gas concentration in the simulated feed liquid controllable; the simulated feed liquid is recycled to reduce material consumption; heat recovery is carried out for the feed and product to reduce energy consumption.

[0009] The technical solution adopted to solve the technical problem of the present invention is to provide a test device for the degassing factor of a degassing tower, including:

[0010] The degassing tower to be measured, which is used for degassing;

[0011] The product pipeline, which is connected to the outlet of the degassing tower to be measured;

[0012] The pipeline for injecting trace and constant gases, which is connected to the product pipeline and is used for introducing the first type of simulated gas;

[0013] The feed pipeline is connected to the inlet of the degassing tower to be measured;

[0014] The on-line detection instrument for the dissolved gas concentration of the simulated feed liquid is arranged at one end of the feed pipeline connected to the inlet of the degassing tower to be measured. The on-line detection instrument for the dissolved gas concentration of the simulated feed liquid is used to detect the gas y concentration ω in the simulated feed liquid before degassing. iy ;

[0015] The buffer tank is respectively connected to the discharge pipeline and the feed pipeline. The buffer tank is connected to the outlet of the degassing tower to be measured through the discharge pipeline and connected to the inlet of the degassing tower to be measured through the feed pipeline. The buffer tank is used to buffer the simulated feed liquid dissolved with the first type of simulated gas to increase the dissolution time. A buffer tank inlet is arranged on the buffer tank, and the buffer tank inlet is used to introduce the simulated feed liquid simulating the nuclear power plant coolant.

[0016] The on-line detection instrument for the gas concentration of the simulated feed liquid after degassing is arranged at one end of the discharge pipeline connected to the outlet of the degassing tower to be measured. The on-line detection instrument for the gas concentration of the simulated feed liquid after degassing is used to detect the gas y concentration ω in the simulated feed liquid after degassing. oy ;

[0017] The outlet of the trace gas concentrate pipeline is connected to the feed pipeline;

[0018] The metering pump is arranged on the trace gas concentrate pipeline and is used to control the flow rate of the injected trace gas concentrate.

[0019] The trace gas injection pipeline is connected to the auxiliary batching tank. The trace gas injection pipeline is used to introduce the second type of simulated gas, and the concentration of the second type of simulated gas in the simulated feed liquid is less than the concentration of the first type of simulated gas.

[0020] The auxiliary batching tank is connected to the trace gas concentrate pipeline. The auxiliary batching tank is connected to the feed pipeline through the trace gas concentrate pipeline. An auxiliary batching tank inlet is arranged on the auxiliary batching tank, and the auxiliary batching tank inlet is used to introduce the simulated feed liquid simulating the nuclear power plant coolant. The auxiliary batching tank is used to introduce the second type of simulated gas into the simulated feed liquid for dissolution to prepare and store the trace gas concentrate.

[0021] Preferably, the test device for the degassing factor of the degassing tower further includes:

[0022] The heat exchanger is arranged on the discharge pipeline, and the heat exchanger is used to heat exchange the fluid in the discharge pipeline.

[0023] Preferably, the test device for the degassing factor of the degassing tower further includes:

[0024] A regeneration heat exchanger is provided on the feed pipeline. The shell side of the regeneration heat exchanger is connected to the feed pipeline, and the tube side of the regeneration heat exchanger is connected to the discharge pipeline. The regeneration heat exchanger is used for heat exchange between the simulated liquid in the discharge pipeline and the simulated liquid in the feed pipeline to recover heat.

[0025] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0026] A first jet mixing device is provided on the discharge pipeline. The first inlet of the first jet mixing device is connected to the discharge pipeline, the second inlet of the first jet mixing device is connected to the normal and trace gas injection pipeline, and the outlet of the first jet mixing device is connected to the buffer tank. The first jet mixing device disperses and mixes the first type of simulated gas in the simulated liquid.

[0027] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0028] A gas-liquid mixing device is provided on the discharge pipeline. The inlet of the gas-liquid mixing device is connected to the outlet of the first jet mixing device, and the outlet of the gas-liquid mixing device is connected to the buffer tank. The gas-liquid mixing device is used to accelerate the mixing and dissolution of the first type of simulated gas in the simulated liquid.

[0029] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0030] A liquid mixing device is provided on the feed pipeline. The inlet of the liquid mixing device is located downstream of the connection between the trace gas concentrate pipeline and the feed pipeline, and the outlet of the liquid mixing device is connected to the inlet of the degassing tower to be tested. The liquid mixing device fully mixes the trace gas concentrate with the simulated liquid.

[0031] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0032] A vacuum pump is connected to the degassing tower to be tested, and the vacuum pump is used to evacuate the degassing tower to be tested;

[0033] A secondary steam condensation cooler is connected to the degassing tower to be tested, and the secondary steam condensation cooler is used to cool the steam generated by the degassing tower to be tested.

[0034] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0035] A circulation pump, the inlet of the circulation pump is connected to the auxiliary batching tank;

[0036] Second injection mixing device, the first inlet of the second injection mixing device is connected to the outlet of the circulation pump, the second inlet of the second injection mixing device is connected to the trace gas filling pipeline, the outlet of the second injection mixing device is connected to the auxiliary batching tank, and the gas outlet of the auxiliary batching tank is connected to the second inlet of the second injection mixing device. The second injection mixing device is used to fully mix the trace gas and / or the gas in the auxiliary batching tank with the liquid in the auxiliary batching tank.

[0037] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0038] Trace gas filling device, connected to the trace gas filling pipeline, and the trace gas filling device is used to quantitatively add the second type of simulated gas.

[0039] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0040] Gas flow controller, arranged on the constant and trace gas filling pipeline, and the gas flow controller is used to control the gas flow.

[0041] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0042] Dewatering pump of the degassing tower to be measured, arranged on the discharge pipeline;

[0043] Simulated feed liquid transfer pump, arranged on the feed pipeline.

[0044] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0045] Online detection and calculation unit, the online detection instrument for the dissolved gas concentration of the simulated feed liquid sends the detected gas concentration ω iy of the simulated feed liquid before degassing to the online detection and calculation unit, and the online detection instrument for the gas concentration of the simulated feed liquid after degassing sends the detected gas concentration ω oy of the simulated feed liquid after degassing to the online detection and calculation unit. The online detection and calculation unit calculates the degassing coefficient DF y = ω iy / ω oy .

[0046] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0047] Simulated feed liquid sampling device, arranged at one end of the feed pipeline connected to the inlet of the degassing tower to be measured, and the simulated feed liquid sampling device is used for sampling;

[0048] Sampling device for the simulated feed liquid after degassing, arranged at one end of the discharge pipeline connected to the outlet of the degassing tower to be measured, and the sampling device for the simulated feed liquid after degassing is used for sampling.

[0049] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0050] A sampling detection and calculation unit, configured to obtain the concentration ω of simulated gas x in the simulated feed liquid before degassing taken by the simulated feed liquid sampling device ix and the concentration ω of simulated gas x in the simulated feed liquid after degassing taken by the simulated feed liquid sampling device after degassing ox . The sampling detection and calculation unit calculates the degassing coefficient DF x = ω ix / ω ox .

[0051] Preferably, for the testing device for the degassing factor of the degassing tower,

[0052] The first type of simulated gas is oxygen and / or hydrogen;

[0053] The second type of simulated gas is krypton and / or xenon.

[0054] The testing device for the degassing factor of the degassing tower of the present invention recycles the simulated feed liquid, has high economy; distinguishes high-concentration gases and low-concentration gases, and separately injects according to the concentration requirements of different gases in the simulated feed liquid, making the gas concentration in the simulated feed liquid highly controllable and having a wide application range. The testing device of the present invention adopts the method of circulating gas injection and degassing, which not only saves water, can operate stably for a long time continuously, but also is conducive to stability testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a schematic structural diagram of the testing device for the degassing factor of the degassing tower in Embodiment 2 of the present invention.

[0056] In the figure: 1. Buffer tank; 2. Auxiliary batching tank; 3. Degassing tower to be tested; 4. Simulated feed liquid sampling device; 5. On-line detection instrument for the gas concentration of the simulated feed liquid; 6. Simulated feed liquid sampling device after degassing; 7. On-line detection instrument for the gas concentration of the simulated feed liquid after degassing; 8. First injection mixing device; 9. Gas flow controller; 10. Gas-liquid mixing device; 11. Simulated feed liquid delivery pump; 12. Metering pump; 13. Liquid mixing device; 14. Drain pump of the degassing tower to be tested; 15. Heat exchanger; 16. Second injection mixing device; 17. Trace gas injection device; 18. Circulation pump; 19. Flow regulating valve; 20. Secondary steam condensation cooler; 21. Vacuum pump; 22. Regenerative heat exchanger; 23 - Discharge pipeline; 24 - Normal and trace gas injection pipeline; 25 - Feed pipeline; 26 - Trace gas concentrate pipeline; 27 - Trace gas injection pipeline. DETAILED DESCRIPTION OF THE INVENTION

[0057] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] The embodiments of the present patent will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present patent and should not be construed as a limitation to the present patent.

[0059] In the description of the present patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present patent.

[0060] In the description of the present patent, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present patent can be understood according to specific circumstances.

[0061] Embodiment 1

[0062] This embodiment provides a test device for the degassing factor of a degassing tower, including:

[0063] The degassing tower to be measured, which is used for degassing;

[0064] The discharge pipeline, which is connected to the outlet of the degassing tower to be measured;

[0065] The pipeline for injecting trace and constant gases, which is connected to the discharge pipeline and is used for introducing the first type of simulated gas;

[0066] The feed pipeline, which is connected to the inlet of the degassing tower to be measured;

[0067] The on-line detector for the dissolved gas concentration of the simulated feed liquid is arranged at one end of the feed pipeline connected to the inlet of the degassing tower to be measured, and the on-line detector for the dissolved gas concentration of the simulated feed liquid is used to detect the gas y concentration ω in the simulated feed liquid before degassing iy ;

[0068] A buffer tank is respectively connected to a discharge pipeline and a feed pipeline. The buffer tank is used to buffer the simulated liquid material dissolved with the first type of simulated gas to increase the dissolution time. A buffer tank inlet is provided on the buffer tank. The buffer tank inlet is used to introduce the simulated liquid material of the simulated nuclear power plant coolant, usually introduced before the test. During the test, the simulated liquid material is recycled;

[0069] An on-line detector for the gas concentration of the simulated liquid material after degassing is arranged at one end of the discharge pipeline connected to the outlet of the to-be-tested degassing tower. The on-line detector for the gas concentration of the simulated liquid material after degassing is used to detect the gas y concentration ω in the simulated liquid material after degassing oy ;

[0070] A trace gas concentrate pipeline is connected to the feed pipeline;

[0071] A metering pump is arranged on the trace gas concentrate pipeline and is used to control the injection flow rate of the trace gas concentrate;

[0072] A trace gas injection pipeline is connected to the auxiliary batching tank. The trace gas injection pipeline is used to introduce the second type of simulated gas, and the concentration of the second type of simulated gas in the simulated liquid material is less than the concentration of the first type of simulated gas;

[0073] An auxiliary batching tank is connected to the trace gas concentrate pipeline. An auxiliary batching tank inlet is provided on the auxiliary batching tank. The auxiliary batching tank inlet is used to introduce the simulated liquid material of the simulated nuclear power plant coolant. The auxiliary batching tank is used to dissolve the second type of simulated gas into the simulated liquid material to prepare and store the trace gas concentrate.

[0074] The test device for the degassing factor of the degassing tower in this embodiment recycles the simulated liquid material, has high economy; distinguishes high-concentration gas and low-concentration gas, and separately injects according to the concentration requirements of different gases in the simulated liquid material, so that the gas concentration in the simulated liquid material is highly controllable and has a wide application range. The test device in this embodiment adopts the method of cyclic gas injection and degassing, which not only saves water, can operate stably for a long time continuously, and is beneficial to stability testing.

[0075] Embodiment 2

[0076] As Figure 1 shown, this embodiment provides a test device for the degassing factor of a degassing tower, including:

[0077] A to-be-tested degassing tower 3 for degassing;

[0078] A discharge pipeline 23 is connected to the outlet of the to-be-tested degassing tower 3;

[0079] The normal and trace gas injection pipeline 24 is connected to the discharge pipeline 23. The normal and trace gas injection pipeline 24 is used to introduce the first type of simulated gas. The target concentration of the first type of simulated gas in the simulated liquid is greater than or equal to 0.1 ppm, which is a constant or trace concentration.

[0080] The feed pipeline 25 is connected to the inlet of the to-be-tested degassing tower 3.

[0081] The on-line detector 5 for the dissolved gas concentration of the simulated liquid is set at one end of the feed pipeline 25 connected to the inlet of the to-be-tested degassing tower 3. The on-line detector 5 for the dissolved gas concentration of the simulated liquid is used to detect the gas y concentration ω in the simulated liquid before degassing. iy ;

[0082] The buffer tank 1 is respectively connected to the discharge pipeline 23 and the feed pipeline 25. The buffer tank 1 is connected to the outlet of the to-be-tested degassing tower 3 through the discharge pipeline 23, and the buffer tank 1 is connected to the inlet of the to-be-tested degassing tower 3 through the feed pipeline 25. The buffer tank 1 is used to buffer the simulated liquid dissolved with the first type of simulated gas to increase the dissolution time. The buffer tank 1 is provided with a buffer tank 1 inlet. The buffer tank 1 inlet is used to introduce the simulated liquid simulating the nuclear power plant coolant, usually introduced before the test. The simulated liquid is recycled during the test.

[0083] The on-line detector 7 for the gas concentration of the simulated liquid after degassing is set at one end of the discharge pipeline 23 connected to the outlet of the to-be-tested degassing tower 3. The on-line detector 7 for the gas concentration of the simulated liquid after degassing is used to detect the gas y concentration ω in the simulated liquid after degassing. oy ;

[0084] The trace gas concentrate pipeline 26 is connected to the feed pipeline 25.

[0085] The metering pump 12 is set on the trace gas concentrate pipeline 26 and is used to control the injection flow rate of the trace gas concentrate.

[0086] The trace gas injection pipeline 27 is connected to the auxiliary batching tank 2. The trace gas injection pipeline 27 is used to introduce the second type of simulated gas. The target concentration of the second type of simulated gas in the simulated liquid is less than 0.1 ppm, which is a trace concentration. The target concentration of the second type of simulated gas is usually much less than that of the first type of simulated gas.

[0087] The auxiliary batching tank 2 is connected to the trace gas concentrate pipeline 26. The auxiliary batching tank 2 is connected to the feed pipeline 25 through the trace gas concentrate pipeline 26. The auxiliary batching tank 2 is provided with an auxiliary batching tank 2 inlet. The auxiliary batching tank 2 inlet is used to introduce the solvent for preparing the trace gas concentrate, usually an aqueous solution. The auxiliary batching tank 2 is used to dissolve the second type of simulated gas into the simulated liquid to prepare and store the trace gas concentrate.

[0088] The simulated feed liquid sampling device 4 is arranged at one end of the feed pipeline 25 connecting to the inlet of the degassing tower 3 to be measured, and the simulated feed liquid sampling device 4 is used for sampling;

[0089] The simulated feed liquid sampling device 6 after degassing is arranged at one end of the discharge pipeline 23 connecting to the outlet of the degassing tower 3 to be measured, and the simulated feed liquid sampling device 6 after degassing is used for sampling;

[0090] The metering pump is connected to the auxiliary dosing tank 2 and the feed pipeline 25 through the trace gas concentrate pipeline 26. The trace gas concentrate enters the feed pipeline 25 through the trace gas concentrate pipeline 26 and the metering pump. The flow rate of the trace gas concentrate entering the feed pipeline is controlled by the metering pump 12, and further the flow rate ratio of the trace gas concentrate and the feed liquid in the feed pipeline is controlled, and further the dilution multiple of the trace gas concentrate is controlled, so that the concentration of the trace gas in the simulated feed liquid reaches the target value.

[0091] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0092] The heat exchanger 15 is arranged on the discharge pipeline 23, and the heat exchanger 15 is used for heat exchange of the fluid in the discharge pipeline 23.

[0093] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0094] The regenerative heat exchanger 22 is arranged on the feed pipeline 25. The shell side of the regenerative heat exchanger 22 is connected to the feed pipeline 25, and the tube side of the regenerative heat exchanger 22 is connected to the discharge pipeline 23. The regenerative heat exchanger 22 is used for recovering the heat of the discharged material from the degassing tower. The regenerative heat exchanger 22 is used for recovering the heat of the simulated feed liquid in the discharge pipeline 23 to heat the simulated feed liquid in the feed pipeline 25.

[0095] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0096] The first jet mixing device 8 is arranged on the discharge pipeline 23. The first inlet of the first jet mixing device 8 is connected to the discharge pipeline 23, the second inlet of the first jet mixing device 8 is connected to the normal and trace gas injection pipeline 24, and the outlet of the first jet mixing device 8 is connected to the gas-liquid mixing device 10. The first jet mixing device 8 disperses and mixes the first type of simulated gas in the simulated feed liquid. The first jet mixing device 8 is a Venturi ejector.

[0097] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0098] The gas-liquid mixing device 10 is arranged on the discharge pipeline 23. The inlet of the gas-liquid mixing device 10 is connected to the outlet of the first injection mixing device 8, and the outlet of the gas-liquid mixing device 10 is connected to the buffer tank 1. The gas-liquid mixing device 10 is used to accelerate the mixing and dissolution of the first type of simulated gas in the simulated liquid.

[0099] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0100] The liquid mixing device 13 is arranged on the feed pipeline 25. The inlet of the liquid mixing device is located downstream of the connection between the trace gas concentrate pipeline 26 and the feed pipeline 25. The inlet of the liquid mixing device 13 is respectively connected to the trace gas concentrate pipeline 26 and the buffer tank 1, and the outlet of the liquid mixing device 13 is connected to the inlet of the tested degassing tower 3. The liquid mixing device 13 enables the trace gas concentrate to be fully mixed with the simulated liquid.

[0101] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0102] The vacuum pump 21 is connected to the tested degassing tower 3. The vacuum pump 21 is used to control the vacuum degree of the tested degassing tower 3;

[0103] The secondary steam condensation cooler 20 is connected to the tested degassing tower 3. The secondary steam condensation cooler 20 is used to cool the steam generated by the tested degassing tower 3.

[0104] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0105] The circulation pump 18, the inlet of the circulation pump 18 is connected to the auxiliary batching tank 2;

[0106] The second injection mixing device 16, the first inlet of the second injection mixing device 16 is connected to the outlet of the circulation pump 18, the second inlet of the second injection mixing device 16 is connected to the trace gas injection pipeline 27, the outlet of the second injection mixing device 16 is connected to the auxiliary batching tank 2, and the gas outlet of the auxiliary batching tank 2 is connected to the second inlet of the second injection mixing device 16. The second injection mixing device 16 is used to fully mix the trace gas and / or the gas in the auxiliary batching tank 2 with the liquid in the auxiliary batching tank 2.

[0107] Preferably, the concentrate gas introduction device is the second injection mixing device 16, and the second injection mixing device 16 adopts a Venturi ejector. The gas-phase suction port of the Venturi ejector is not only connected to the trace gas injection device 17 but also connected to the gas-phase outlet of the auxiliary batching tank 2, so that the gas phase and liquid phase in the auxiliary batching tank 2 can be fully mixed without gas injection.

[0108] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0109] A trace gas filling device 17, which is connected to a trace gas filling pipeline 27, and the trace gas filling device 17 is used for quantitatively adding a second type of simulated gas. Specifically, the trace gas filling device 17 is used for adding the second type of simulated gas according to a preset mass.

[0110] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0111] A gas flow controller 9, which is arranged on the normal and trace gas filling pipeline 24, and the gas flow controller 9 is used for controlling the gas flow.

[0112] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0113] A drain pump 14 of the degassing tower to be measured, which is arranged on the discharge pipeline 23;

[0114] A simulated feed liquid transfer pump 11, which is arranged on the feed pipeline 25.

[0115] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0116] An on-line detection and calculation unit. The on-line detection instrument for the dissolved gas concentration of the simulated feed liquid sends the detected gas concentration ω of the simulated feed liquid before degassing to the on-line detection and calculation unit. iy The on-line detection instrument for the gas concentration of the simulated feed liquid after degassing sends the detected gas concentration ω of the simulated feed liquid after degassing to the on-line detection and calculation unit. The on-line detection unit calculates the degassing coefficient DF oy = ω y / ω iy oy .

[0117] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0118] A simulated feed liquid sampling device 4, which is arranged at one end of the feed pipeline connected to the inlet of the degassing tower to be measured. The simulated feed liquid sampling device 4 is used for sampling the simulated feed liquid before degassing to measure the gas x concentration ω in the simulated feed liquid ix ;

[0119] Preferably, the gas that is not convenient for the on-line monitoring instrument 5 for the simulated feed liquid concentration to detect is sampled by the simulated feed liquid sampling device 4 and then detected offline.

[0120] Preferably, the testing device for the degassing factor of the degassing tower further includes:

[0121] A sampling device 6 for the simulated feed liquid after degassing, which is arranged at one end of the discharge pipeline connected to the outlet of the degassing tower to be measured, and is used for sampling the simulated feed liquid after degassing to detect the gas x concentration ω in the simulated feed liquid after degassingox 。

[0122] Preferably, the gas that is not convenient for the on-line monitoring instrument 7 for detecting the concentration of the simulated feed liquid after degassing is sampled by the simulated feed liquid sampling device 6 and then detected offline.

[0123] Preferably, the test device for the degassing factor of the degassing tower further includes:

[0124] A sampling detection calculation unit for obtaining the concentration ω of the simulated gas x in the simulated feed liquid before degassing detected offline taken by the simulated feed liquid sampling device ix , and the concentration ω of the simulated gas x in the degassed simulated feed liquid taken by the degassed simulated feed liquid sampling device ox . The sampling detection calculation unit calculates the degassing coefficient DF x = ω ix / ω ox .

[0125] Specifically, the sampling detection calculation unit can manually input the detected concentration result, or the offline detection device can send the detected concentration result to the sampling detection calculation unit.

[0126] The offline test device is used to detect the gas concentration ω in the simulated feed liquid before degassing taken by the simulated feed liquid sampling device ix , and the offline test device is also used to detect the gas concentration ω in the degassed simulated feed liquid taken by the degassed simulated feed liquid sampling device ox .

[0127] Preferably, for the test device for the degassing factor of the degassing tower,

[0128] the simulated gas y is oxygen and / or hydrogen;

[0129] the simulated gas x is krypton and / or xenon.

[0130] Preferably, the gas with a concentration requirement between 0.1 ppm and 1000 ppm in the simulated feed liquid is added according to the first type of simulated gas addition method, that is, the common and trace gas addition method. The gas with a concentration requirement between 0.01 ppb and 100 ppb in the simulated feed liquid is added according to the second type of simulated gas addition method, that is, the trace gas addition method.

[0131] The test device for the degassing factor of the degassing tower in this embodiment

[0132] 1. The degassed simulated feed liquid coming out of the degassing tower 3 to be measured passes through the jet mixing device and is mixed with the specified first type of simulated gas (such as gases with high dissolved concentration requirements like oxygen and hydrogen, whose flow rate is controlled by the gas flow controller 9). After being fully mixed through the gas-liquid mixing device 10, a high-concentration solution of this gas is formed and enters the buffer tank 1.

[0133] 2. The liquid in the buffer tank 1 is transported to the downstream by the simulated feed liquid transfer pump 11. Before entering the degassing tower 3 to be measured, the metering pump 12 injects the specified second type of simulated gas (such as gases with low dissolved concentration requirements like krypton and xenon) and the concentrated solution of the simulated feed liquid in the auxiliary batching tank 2 into it according to the set ratio. After the concentrated solution and the simulated feed liquid are mixed and diluted through the liquid mixing device 13, a low-concentration solution of this specified gas is formed.

[0134] 3. Then the simulated feed liquid enters the degassing tower 3 to be measured for degassing.

[0135] 4. The on-line detection instrument 5 for the dissolved gas concentration of the simulated feed liquid, the on-line detection instrument 7 for the gas concentration of the degassed simulated feed liquid, the sampling device 4 for the simulated feed liquid, and the sampling device 6 for the degassed simulated feed liquid are used to analyze the gas concentration to calculate the degassing factor.

[0136] The simulated feed liquid circulates between the degassing tower 3 to be measured and the buffer tank 1, and the introduction and removal of gas are carried out simultaneously.

[0137] The degassing factor test device for the degassing tower in this embodiment distinguishes the addition methods of high-concentration gases and low-concentration gases. For gases with high dissolved concentration requirements, the method of directly dissolving the gas in the simulated feed liquid is adopted. For gases with low dissolved concentration requirements, the concentrated solution is pre-configured in the auxiliary batching tank 2 and then injected into the simulated feed liquid according to the ratio.

[0138] The auxiliary batching tank 2 is closed to the environment. When configuring the concentrated solution, according to the gas concentration requirements of the concentrated solution, the addition amount of the specified second type of simulated gas to the auxiliary batching tank 2 through the micro gas filling device 17 is determined by using the gas-liquid phase equilibrium and material conservation relationships in the auxiliary batching tank 2.

[0139] The auxiliary batching tank 2, the circulation pump 18, and the second jet mixing device 16 can form a circulation to promote the full mixing of the gas-liquid phases in the auxiliary batching tank 2 to quickly reach or approach the gas-liquid phase equilibrium state.

[0140] According to the gas concentration requirements of the simulated feed liquid, the flow rate of the concentrated solution injected by the metering pump 12 into the simulated feed liquid is determined.

[0141] Preferably, the volume of the auxiliary batching tank 2 should be such that during a single test, the decrease amplitude of the gas phase pressure caused by the decrease in the liquid level is not higher than 25%.

[0142] The auxiliary batching tank 2, the circulation pump 18, and the second injection mixing device 16 can form a cycle to promote the full mixing of the gas-liquid phases in the auxiliary batching tank 2, so as to quickly reach or approach the gas-liquid phase equilibrium state.

[0143] The degassing factor test device for the degassing tower in this embodiment further includes:

[0144] A flow regulating valve 19 is provided on the feed pipeline 25. The flow regulating valve 19 is downstream of the liquid mixing device 13, the regeneration heat exchanger 22 is downstream of the liquid mixing device 13, and the flow regulating valve 19 is downstream of the regeneration heat exchanger 22.

[0145] The flow rate of the simulated feed liquid entering the degassing tower is controlled by the flow regulating valve 19, and the temperature of the simulated feed liquid is controlled by the heat exchanger 15.

[0146] According to the requirement of the gas concentration of the simulated feed liquid, the flow rate of the concentrated liquid injected into the simulated feed liquid by the metering pump 12 is determined. The flow rate of the simulated feed liquid is controlled by the flow regulating valve 19.

[0147] Preferably, the flow rate of the simulated feed liquid is 10 to 10,000 times the flow rate of the metering pump 12.

[0148] The pressure in the degassing tower is adjustable. If a negative pressure is required, it can be achieved by the vacuum pump 21, and the maximum vacuum degree is 0.099 MPa.

[0149] The simulated feed liquid sampling device 4 and the degassed simulated feed liquid sampling device 6 can provide samples for the analysis of trace (10 -6 ~1 ppb) level Kr and Xe.

[0150] Specifically, in this embodiment, the degassed simulated feed liquid coming out of the degassing tower 3 to be measured is heated by the regeneration heat exchanger and then enters the injection mixing device 8 (a Venturi ejector in this embodiment). The gas flow controller 9 injects oxygen into it through the injection mixing device 8 at a rate of 50 to 300 NL / h to prepare an oxygen solution of 1 to 10 ppm, and then the simulated feed liquid enters the buffer tank 1.

[0151] The volume of the auxiliary batching tank 2 is 1 to 10 m 3 , and the concentrated liquid therein is obtained by injecting 1 to 10 NL of krypton gas into the auxiliary batching tank 2 through the trace gas injection device 17 before the start of the test and then fully circulating and mixing by the concentrated liquid circulation pump 18 and the second injection mixing device 16 (a Venturi ejector in this embodiment) to obtain a krypton concentrated liquid of 100 to 1000 ppb. The addition amount of krypton gas is determined according to the concentration requirement of 100 to 1000 ppb by using the gas-liquid phase equilibrium and material conservation relationships in the auxiliary batching tank 2.

[0152] The liquid in the buffer tank 1 is transported to the downstream by the simulated feed liquid transfer pump 11. Before entering the to-be-tested degassing tower 3, the metering pump 12 injects the krypton concentrate in the auxiliary batching tank 2 into it at a rate of 1 / 500 - 1 / 5000 of the simulated feed liquid flow rate. After the krypton concentrate and the simulated feed liquid are mixed and diluted by the liquid mixing device 13, a simulated feed liquid with a krypton concentration of 0.01 - 10 ppb is formed.

[0153] After the krypton concentrate is added, the simulated feed liquid enters the to-be-tested degassing tower 3 for degassing.

[0154] The on-line detection instruments 5 for the dissolved gas concentration of the simulated feed liquid at the inlet and outlet of the degassing tower and the on-line detection instrument 7 for the gas concentration of the simulated feed liquid after degassing test the oxygen concentration, which are w i,O and w o,O The degassing coefficient DF of oxygen O can be calculated by the following formula.

[0155]

[0156] The sampling devices 4 for the simulated feed liquid at the inlet and outlet of the degassing tower and the sampling device 6 for the simulated feed liquid after degassing respectively sample the simulated feed liquid and the simulated feed liquid after degassing. After off-line analysis, the krypton concentrations at the inlet and outlet of the degassing tower can be obtained, which are w i,Kr and w o,Kr . The degassing coefficient DF of krypton Kr can be calculated according to the following formula

[0157]

[0158] Similarly, the inlet and outlet concentrations of xenon can be obtained by a similar method, which are w i,Xe and w o,Xe . The degassing coefficient DF of xenon Xe can be calculated according to the following formula

[0159]

[0160] The flow rate of the simulated feed liquid is controlled by the flow regulating valve 19.

[0161] The temperature of the simulated feed liquid is controlled by the heat exchanger 15.

[0162] The pressure and temperature of the degassing test are regulated by the vacuum pump 21.

[0163] This embodiment discloses a testing device for the degassing factor (the ratio of the inlet concentration to the outlet concentration of a certain gas in the simulated feed liquid) of a degassing tower for reactor coolant in a nuclear power plant, which is used to test the degassing factors of gases such as oxygen, hydrogen, krypton, and xenon in the reactor coolant by the degassing tower. For gases with a high content in the simulated feed liquid, such as oxygen and hydrogen, after the simulated feed liquid is filled with gas to a set value, it enters the degassing tower to be tested for degassing, and then returns to be filled with gas again, and so on in a cycle. For gases with a low content in the feed, such as krypton and xenon, the second type of simulated gas is injected into the auxiliary batching tank 2 by the trace gas filling device 17 in a certain proportion to configure a concentrated solution with the simulated feed liquid. After being fully mixed, it enters the degassing tower to be tested for degassing, and then returns and is injected with the concentrated solution again, and so on in a cycle. The concentrations of oxygen, hydrogen, etc. in the simulated feed liquid can be detected by on-line instruments or by sampling for off-line detection. The concentrations of krypton, xenon, etc. can be detected by sampling for off-line detection. This device recycles the simulated feed liquid, has high economy; distinguishes high-concentration gases and low-concentration gases, enables the concentration in the simulated feed liquid to be highly controllable, and has a wide application range. The testing device for the degassing factor of the degassing tower in this embodiment recycles the simulated feed liquid, has high economy; distinguishes high-concentration gases and low-concentration gases, and according to the concentration requirements of different gases in the simulated feed liquid, fills them separately, making the gas concentration in the simulated feed liquid highly controllable and having a wide application range. The testing device in this embodiment adopts the method of cyclic gas filling and degassing, which not only saves water, can operate stably for a long time continuously, and is conducive to stability testing.

[0164] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A testing device for the degassing factor of a degassing tower, characterized in that: include: The degassing tower under test is used for degassing; The discharge pipe is connected to the outlet of the degassing tower to be tested; A normal and trace gas filling pipeline is connected to the discharge pipeline, and the normal and trace gas filling pipeline is used to introduce the first type of simulated gas; A feed pipeline connected to the inlet of the degassing tower to be tested; The online detection instrument for dissolved gas concentration in simulated liquid is installed at one end of the feed pipe connected to the inlet of the degassing tower to be tested. The online detection instrument for dissolved gas concentration in simulated liquid is used to detect the gas y concentration ω in the simulated liquid before degassing. iy ; A buffer tank is connected to the discharge pipe and the feed pipe respectively. The buffer tank is used to buffer the simulated liquid containing the first type of simulated gas to increase the dissolution time. The buffer tank is provided with a buffer tank inlet. The buffer tank inlet is used to pass the simulated liquid simulating the coolant of a nuclear power plant. The online detection instrument for the gas concentration of the simulated liquid after degassing is set at one end of the discharge pipe connected to the outlet of the degassing tower to be tested. The online detection instrument for the gas concentration of the simulated liquid after degassing is used to detect the gas y concentration ω in the simulated liquid after degassing. oy ; A trace gas concentrate pipeline connected to the feed pipeline; A metering pump, arranged on the trace gas concentrate pipeline, for controlling the flow rate of the trace gas concentrate injection; A trace gas filling pipeline is connected to the auxiliary batching tank, and the trace gas filling pipeline is used to introduce the second type of simulated gas, and the concentration of the second type of simulated gas in the simulated liquid is less than the concentration of the first type of simulated gas; The auxiliary batching tank is connected to the trace gas concentrate pipeline. The auxiliary batching tank is provided with an auxiliary batching tank inlet. The auxiliary batching tank inlet is used to introduce simulated liquid simulating the coolant of a nuclear power plant. The auxiliary batching tank is used to dissolve the second type of simulated gas into the simulated liquid to prepare and store the trace gas concentrate.

2. The testing device for the degassing factor of the degassing tower according to claim 1, characterized in that: Also includes: The heat exchanger is arranged on the discharge pipe, and is used for exchanging heat for the fluid in the discharge pipe.

3. The testing device for the degassing factor of the degassing tower according to claim 1, characterized in that: Also includes: The regenerative heat exchanger is arranged on the feed pipeline. The shell side of the regenerative heat exchanger is connected to the feed pipeline, and the tube side of the regenerative heat exchanger is connected to the discharge pipeline. The regenerative heat exchanger is used to exchange heat between the simulated feed liquid in the discharge pipeline and the simulated feed liquid in the feed pipeline to recover heat.

4. The testing device for the degassing factor of the degassing tower according to claim 1, characterized in that: Also includes: The first jet mixing device is arranged on the discharge pipeline, the first inlet of the first jet mixing device is connected to the discharge pipeline, the second inlet of the first jet mixing device is connected to the normal and trace gas filling pipeline, the outlet of the first jet mixing device is connected to the buffer tank, and the first jet mixing device disperses and mixes the first type of simulated gas in the simulated liquid.

5. The testing device for the degassing factor of the degassing tower according to claim 4, characterized in that: Also includes: The gas-liquid mixing device is arranged on the discharge pipeline, the inlet of the gas-liquid mixing device is connected to the outlet of the first injection mixing device, the outlet of the gas-liquid mixing device is connected to the buffer tank, and the gas-liquid mixing device is used for mixing and dissolving the first type of simulated gas in the simulated feed liquid.

6. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: The liquid mixing device is arranged on the feed pipeline, the inlet of the liquid mixing device is located downstream of the connection between the trace gas concentrate pipeline and the feed pipeline, the outlet of the liquid mixing device is connected to the inlet of the degassing tower to be tested, and the liquid mixing device mixes the trace gas concentrate with the simulated feed liquid.

7. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: A vacuum pump is connected to the degassing tower to be tested, and is used to evacuate the degassing tower to be tested; The secondary steam condensation cooler is connected to the degassing tower to be tested, and is used for cooling the steam generated by the degassing tower to be tested.

8. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: Circulation pump, the circulation pump inlet is connected with the auxiliary batching tank; A second jet mixing device, wherein the first inlet of the second jet mixing device is connected to the outlet of the circulation pump, the second inlet of the second jet mixing device is connected to the trace gas filling pipeline, the outlet of the second jet mixing device is connected to the auxiliary dosing tank, the gas outlet of the auxiliary dosing tank is connected to the second inlet of the second jet mixing device, and the second jet mixing device is used to mix the trace gas and / or the gas in the auxiliary dosing tank with the liquid in the auxiliary dosing tank.

9. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: The trace gas filling device is connected to the trace gas filling pipeline, and is used for quantitatively adding the second type of simulated gas.

10. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: The gas flow controller is arranged on the normal and trace gas filling pipeline, and is used to control the gas flow.

11. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: The degassing tower drain pump under test is installed on the discharge pipe; The simulated liquid delivery pump is installed on the feed pipeline.

12. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: Online detection calculation unit, simulated liquid dissolved gas concentration online detection instrument will detect the gas concentration in the simulated liquid before degassing ω iy The gas concentration in the simulated liquid after degassing is detected by the online detection calculation unit. oy Sent to the online detection calculation unit, the online detection calculation unit calculates the degassing coefficient DF y =ω iy / ω oy .

13. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: Also includes: The simulated liquid sampling device is arranged at one end of the feed pipeline connected to the inlet of the degassing tower to be tested, and the simulated liquid sampling device is used for sampling; The simulated liquid material sampling device after degassing is arranged at one end of the discharge pipe connected to the outlet of the degassing tower to be tested, and the simulated liquid material sampling device after degassing is used for sampling.

14. The testing device for the degassing factor of a degassing tower according to claim 13, characterized in that: Also includes: The sampling detection calculation unit is used to obtain the simulated gas x concentration ω in the simulated liquid before degassing obtained by the simulated liquid sampling device. ix , the simulated gas x concentration in the simulated liquid after degassing obtained by the simulated liquid sampling device after degassing ω ox , the sampling detection calculation unit calculates the degassing coefficient DF x =ω ix / ω ox .

15. The testing device for the degassing factor of a degassing tower according to claim 1, characterized in that: The first type of simulated gas is oxygen and / or hydrogen; The second type of simulation gas is krypton and / or xenon.

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