Nuclear power station gas sampling device

Abstract

The invention provides a nuclear power plant gas sampling device, and relates to the technical field of nuclear power plant nuclear sampling systems.The sampling device comprises a diffusion pipeline, the input end of the diffusion pipeline is connected to a gas collecting pipeline of a nuclear power plant, the diffusion pipeline is provided with a sampling gas pump, and the sampling gas pump is used for obtaining sample gas from the gas collecting pipeline; the input end of the sampler is detachably connected to the first output end of the diffusion pipeline, and the sampler is used for acquiring part of sample gas from the diffusion pipeline; the input end of the post-treatment pipeline is detachably connected to the second output end of the diffusion pipeline or the output end of the sampler, the post-treatment pipeline is provided with a treatment pump, and the treatment pump is used for enabling the sampler to form a negative pressure state and performing post-treatment on gas in the diffusion pipeline. Power is provided for a gas sample, so that the problem of insufficient pressure difference of an REN pipeline is solved, and gas can effectively enter a sampling device.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear sampling systems for nuclear power plants, and in particular to a gas sampling device for nuclear power plants. Background Art

[0002] A large amount of waste gas containing hydrogen and other radioactive substances will be generated during the normal operation and expected operation events of nuclear power plants, and these waste gases will be treated by the waste gas treatment system. In order to ensure safety and meet environmental protection requirements, nuclear power plants are usually equipped with a complete waste gas treatment system to treat these gases. The waste gas treatment system prevents the mixing of combustible gases by limiting the concentration of hydrogen in the connected system. At the same time, the waste gas treatment system is also used to treat waste gas to reduce the radiation dose to personnel and control the radioactivity of waste gas discharged into the environment as low as possible. Therefore, it is necessary to regularly sample the gas in hydrogen-prone containers and retention beds for offline gas analysis. However, in the prior art, the gas sampling device of a nuclear power plant is passive. The passive sample volume is small and easy to be contaminated, resulting in large deviations in the analysis results. And the existing sampling device lacks post-processing measures and is not suitable for radioactive gas sampling. In addition, the existing sampling device also has the defect of inconvenient connection method. Therefore, there is room for improvement. Summary of the invention

[0003] The object of the present invention is to provide a nuclear power plant gas sampling device and a sampling method, which are used to solve the technical problems of the passive sampling device in the prior art, such as small and incomplete sampling volume and easy contamination of samples.

[0004] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention provides a nuclear power plant gas sampling device, comprising:

[0006] A diffusion pipeline, the input end of which is connected to the gas collection pipeline of the nuclear power plant, the diffusion pipeline is provided with a sampling gas pump, and the sampling gas pump is used to obtain sample gas from the gas collection pipeline;

[0007] a sampler, whose input end is detachably connected to the first output end of the diffusion pipeline, and the sampler is used to obtain part of the sample gas from the diffusion pipeline; and

[0008] The post-processing pipeline has an input end which is detachably connected to the second output end of the diffusion pipeline or the output end of the sampler. The post-processing pipeline is provided with a processing pump, which is used to form a negative pressure state in the sampler and post-process the gas in the diffusion pipeline.

[0009] In one embodiment of the present invention, the diffusion pipeline further comprises:

[0010] a diffusion box, whose input end is connected to the output end of the sampling gas pump, the diffusion box is provided with at least two output ends, and the diffusion box is used to store the sample gas; and

[0011] An exhaust gas collection box, whose input end is connected to an output end of the diffusion box, and the exhaust gas collection box is used to collect the exhaust gas in the gas collection pipeline and the diffusion box before the sample gas is introduced into the diffusion pipeline;

[0012] Wherein, the input end of the sampler can be detachably connected to the other output end of the diffusion box.

[0013] In one embodiment of the present invention, the diffusion pipeline further comprises:

[0014] a first check valve, disposed between the output end of the sampling gas pump and the input end of the diffusion box;

[0015] a second check valve, disposed between the output end of the diffusion tank and the input end of the tail gas collecting tank; and

[0016] The third check valve is arranged at the output end of the tail gas collecting box.

[0017] In one embodiment of the present invention, the diffusion pipeline further comprises:

[0018] a first valve, disposed between the output end of the diffusion tank and the second check valve;

[0019] A second valve is provided at the output end of the diffusion box connected to the sampler; and

[0020] The third valve is arranged between the output end of the tail gas collecting box and the third check valve.

[0021] In one embodiment of the present invention, the diffusion pipeline further includes a first pressure gauge, which is disposed on the diffusion box and is used to measure the internal pressure of the diffusion box.

[0022] In one embodiment of the present invention, the sampler comprises:

[0023] a fourth valve, disposed at the input end of the sampler;

[0024] a radioactive gas storage bottle, the input end of which is connected to the fourth valve and is used to store the sample gas;

[0025] a fifth valve connected to the output end of the radioactive gas storage bottle; and

[0026] The fourth check valve is arranged at the output end of the gas collecting pipeline.

[0027] In one embodiment of the present invention, the sampler comprises:

[0028] a sixth valve, disposed at a port of the sampler; and

[0029] The non-radioactive gas storage bottle has an input end connected to the sixth valve.

[0030] In one embodiment of the present invention, the post-processing pipeline further includes:

[0031] The second pressure gauge is arranged at the input end of the post-processing pipeline, and the second pressure gauge is used to measure the pressure of the processing pump when it is working.

[0032] In one embodiment of the present invention, double-cutoff quick connectors are provided at the ports of the diffusion pipeline, the sampler and the post-processing pipeline.

[0033] In one embodiment of the present invention, the sampling device further comprises a power supply module, and the power supply module is used to supply power to the diffusion pipeline, the sampler, and / or the post-processing pipeline.

[0034] As described above, the present invention provides a nuclear power plant gas sampling device and sampling method, which has the following beneficial effects: the present invention solves the problem of insufficient pressure difference in the REN pipeline by providing power for the gas sample, so that the gas can effectively enter the sampling device. The sampling device of the present invention is connected to the on-site equipment in the form of a quick connector, which is convenient for on-site implementation.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 It is a schematic structural diagram of a nuclear power plant gas sampling device in one embodiment of the present invention.

[0038] In the figure:

[0039] 100, diffusion pipeline; 101, diffusion input end; 102, first output end; 103, second output end; 104, sampling gas pump; 105, diffusion box; 106, tail gas collection box; 107, first check valve; 108, second check valve; 109, third check valve; 110, first valve; 111, second valve; 112, third valve; 113, first pressure gauge;

[0040] 200, sampler; 201, fourth valve; 202, radioactive gas storage bottle; 203, fifth valve; 204, fourth check valve; 205, sixth valve; 206, non-radioactive gas storage bottle;

[0041] 300, post-processing pipeline; 301, processing pump; 302, second pressure gauge;

[0042] 400. Gas collection pipeline; 500. Compressed air pipeline; 600. Fume hood; 700. Power supply module. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] First of all, it should be noted that in order to ensure the safety of the internal environment of nuclear power plants and to ensure that the radioactive waste gas discharged into the external environment meets the standards set by the regulatory agency, nuclear power plants are usually equipped with radioactive effluent monitoring (Radioactive Effluent Monitoring, REN) pipelines. The REN pipeline is responsible for collecting gas samples from different parts of the nuclear power plant (such as reactor pressure vessels, steam generators, fuel pools, etc.). The collected samples will be sent to special analysis equipment for testing to determine the type and concentration of radioactive substances therein. When using the existing passive sampling device for gas sampling, due to the problem of insufficient pressure difference in the REN pipeline, the pressure difference of the gas flow in the gas collection pipeline of the REN pipeline is insufficient, which may lead to insufficient sampling or a decrease in sampling speed, thereby affecting the subsequent gas analysis results.

[0045] The present invention provides a nuclear power plant gas sampling device, which relates to the technical field of nuclear sampling systems in nuclear power plants, and can be specifically applied to sampling waste gas containing hydrogen and other radioactive substances generated in normal operation and expected operation events of nuclear power plants. The present invention can provide power for gas samples to perform dynamic sampling, solve the problem of insufficient pressure difference in REN pipelines, and enable gas to effectively enter the sampling device. The following is a detailed description through specific embodiments.

[0046] See also Figure 1 In one embodiment of the present invention, a nuclear power plant gas sampling device may include a diffusion pipeline 100, a sampler 200, and a post-processing pipeline 300. The diffusion pipeline 100 has at least one input end and at least two output ends, which can be respectively represented as a diffusion input end 101, a first output end 102, and a second output end 103. The diffusion input end 101 can be connected to a gas collection pipeline 400 on the REN pipeline of the nuclear power plant. The diffusion pipeline 100 can be provided with a sampling gas pump 104, which can be used to obtain sample gas from the gas collection pipeline 400. In this embodiment, the diffusion input end 101 can also be connected to a compressed air pipeline 500, which can be used to pass compressed air to clean up residual gas in the diffusion pipeline 100. The input end of the sampler 200 can be detachably connected to the first output end 102. The input end of the post-processing pipeline 300 can be detachably connected to the second output end 103, or connected to the output end of the sampler 200. The post-processing pipeline 300 may be provided with a processing pump 301 , which can be used to create a negative pressure state in the sampler 200 during sampling, and to post-process the gas in the diffusion pipeline 100 after the sampling is completed.

[0047] In one embodiment of the present invention, the above-mentioned pipelines and nuclear power plant field equipment are all connected by quick connectors. Specifically, the diffusion input end 101, the first output end 102, the second output end 103, the input end and the output end of the sampler 200, and the input end and the output end of the post-processing pipeline 300 are all connected by double-cutoff quick connectors. The double-cutoff quick connector is a special connection device that can be used in a fluid system that needs to be frequently disconnected and reconnected. The double-cutoff quick connector will automatically close when disconnected to prevent fluid leakage.

[0048] See also Figure 1In one embodiment of the present invention, the diffusion pipeline 100 also includes a diffusion box 105 and an exhaust gas collection box 106. The input end of the diffusion box 105 can be connected to the output end of the sampling gas pump 104. In this embodiment, the diffusion box 105 can be provided with at least two output ends, wherein one output end connected to the sampler 200 is the first output end 102 of the diffusion pipeline 100. The diffusion box 105 can be used to store sample gas. The input end of the exhaust gas collection box 106 can be connected to the other output end of the diffusion box 105. The output end of the exhaust gas collection box 106 is the second output end 103 of the diffusion pipeline 100. The exhaust gas collection box 106 can be used to absorb the exhaust gas in the gas collection pipeline 400 and the diffusion box 105 before the sample gas is introduced into the diffusion pipeline 100.

[0049] See also Figure 1 In one embodiment of the present invention, a plurality of check valves are provided on the diffusion pipeline 100. The check valve can be used to prevent gas backflow, maintain the sealing of the pipeline, and avoid leakage of radioactive gas. In this embodiment, the diffusion pipeline 100 also includes a first check valve 107, a second check valve 108 and a third check valve 109. Among them, the first check valve 107 can be arranged between the output end of the sampling gas pump 104 and the input end of the diffusion box 105. The second check valve 108 can be arranged between the output end of the diffusion box 105 and the input end of the tail gas collection box 106. The third check valve 109 can be arranged at the port of the second output end 103.

[0050] See also Figure 1 In one embodiment of the present invention, a plurality of valves are further provided on the diffusion pipeline 100. The valves can be used to control the connection or closure of the entire pipeline. In this embodiment, the diffusion pipeline 100 further includes a first valve 110, a second valve 111 and a third valve 112. The first valve 110 can be provided between the output end of the diffusion box 105 and the second check valve 108. The second valve 111 can be provided at the port of the first output end 102. The third valve 112 can be provided between the tail gas collection box 106 and the third check valve 109.

[0051] See also Figure 1 In one embodiment of the present invention, the diffusion pipeline 100 further includes a first pressure gauge 113. The first pressure gauge 113 may be disposed on the diffusion box 105, and may be used to measure the internal pressure of the diffusion box 105.

[0052] See also Figure 1In one embodiment of the present invention, the sampler 200 can be used to sample the gas in the diffusion pipeline 100. The sampler 200 can be divided into a radioactive sampler and a non-radioactive sampler. Among them, the radioactive sampler can be used to sample radioactive gases, so the radioactive sampler requires radioactive shielding of the gas stored therein. In this embodiment, the radioactive sampler may include a fourth valve 201, a radioactive gas storage bottle 202, a fifth valve 203 and a fourth check valve 204. Among them, the fourth valve 201 can be arranged at the input end of the sampler 200. The input end of the radioactive gas storage bottle 202 is connected to the fourth valve 201, which is used to store radioactive sample gas. The fifth valve 203 can be connected to the output end of the radioactive gas storage bottle 202. The fourth check valve 204 can be arranged downstream of the fifth valve 203, and specifically, the fourth check valve 204 can be arranged at the output end of the sampler 200.

[0053] In one embodiment of the present invention, the non-radioactive sampler is used to sample non-radioactive gas, and therefore, the non-radioactive sampler is relatively simpler than the radioactive sampler. For example, the input end and the output end of the non-radioactive sampler can share a port. In this embodiment, the non-radioactive sampler may include a sixth valve 205 and a non-radioactive gas storage bottle 206. The sixth valve 205 is disposed at the input end / output end of the sampler 200. The input end / output end of the non-radioactive gas storage bottle 206 is connected to the sixth valve 205.

[0054] In one embodiment of the present invention, the post-processing pipeline 300 may further include a second pressure gauge 302. The second pressure gauge 302 and the processing pump 301 are sequentially arranged along the direction from the input end to the output end of the post-processing pipeline 300. The second pressure gauge 302 can be used to measure the pressure when the processing pump 301 is working.

[0055] In this embodiment, the input end of the post-processing pipeline 300 can be connected to the second output end 103, or can be connected to the output end of the sampler 200. The output end of the post-processing pipeline 300 can be connected to the fume hood 600. The fume hood 600 is an important device for removing harmful gases and dust. The fume hood 600 can quickly discharge the waste gas generated during the experiment through the exhaust system, and then discharge it into the atmosphere after proper treatment to reduce pollution to the environment. The post-processing pipeline 300 can be used to post-process the gas in the diffusion pipeline 100 and the sampler 200 to reduce pollution.

[0056] In one embodiment of the present invention, the nuclear power plant gas sampling device of the present invention further includes a power supply module 700. The power supply module 700 can be used to supply power to the diffusion pipeline 100, the sampler 200 and / or the post-processing pipeline 300. In this embodiment, the power supply module 700 can be specifically used to supply power to the sampling gas pump 104 and the processing pump 301.

[0057] See also Figure 1 In one embodiment of the present invention, when sampling radioactive gas, first, the output end of the sampler 200 is connected to the input end of the post-processing pipeline 300, and the fourth valve 201 is closed and the fifth valve 203 is opened. The processing pump 301 is started, the sampler 200 is evacuated, and the second pressure gauge 302 is observed. When the second pressure gauge 302 reaches a preset negative pressure, the fifth valve 203 is closed and the processing pump 301 is turned off. At this time, the connection between the output end of the sampler 200 and the input end of the post-processing pipeline 300 can be disconnected.

[0058] Then, the input end of the diffusion pipeline 100, that is, the diffusion input end 101, is connected to the output end of the gas collection pipeline 400, and the first valve 110 is opened, and the second valve 111 and the third valve 112 are closed. The sampling gas pump 104 is started so that the residual gas in the gas collection pipeline 400 is sucked into the tail gas collection box 106 to avoid the contamination of the gas sample by the residual gas. It should be noted that when the residual gas is processed, the valve at the output end of the gas collection pipeline 400 is in a closed state. After the residual gas is processed, the first valve 110 is closed and the valve at the output end of the gas collection pipeline 400 is opened. At this time, the sampling gas pump 104 can suck the gas sample of the gas collection pipeline 400 into the diffusion box 105, observe the first pressure gauge 113, and when the pressure in the diffusion box 105 reaches the preset pressure, the sampling gas pump 104 is closed, and the valve at the output end of the gas collection pipeline 400 is closed.

[0059] Then connect the input end of the sampler 200 to the first output end 102. Open the second valve 111 and the fourth valve 201, so that the gas in the diffusion box 105 enters the radioactive gas storage bottle 202 under the action of pressure. After the gas transfer is completed, close the second valve 111 and the fourth valve 201, and disconnect the sampler 200 from the diffusion pipeline 100 to complete the gas sampling.

[0060] Finally, the second output end 103 of the diffusion pipeline 100 is connected to the input end of the post-processing pipeline 300. The first valve 110 and the third valve 112 are opened, and the treatment pump 301 is started to discharge the remaining gas inside the diffusion pipeline 100 into the fume hood 600 for tail gas treatment to eliminate gas pollution. Further, the gas in the diffusion pipeline 100 can also be connected to the post-processing pipeline 300 for treatment after the test is completed.

[0061] In one embodiment of the present invention, when non-radioactive gas sampling is performed, the operation process may refer to the above-mentioned radioactive gas sampling process, which will not be described in detail here.

[0062] In summary, the present invention provides a nuclear power plant gas sampling device and sampling method, which can solve the problem of insufficient pressure difference in the REN pipeline by providing power for the gas sample, so that the gas can effectively enter the sampling device. The sampling device of the present invention is connected to the on-site equipment in the form of a quick connector, which is convenient for on-site implementation. In addition, the present invention is also provided with an exhaust gas treatment unit, which can be used to treat the radioactive gas sample after sampling to avoid air pollution.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A nuclear power plant gas sampling device, characterized in that: include: A diffusion pipeline, the input end of which is connected to the gas collection pipeline of the nuclear power plant, the diffusion pipeline is provided with a sampling gas pump, and the sampling gas pump is used to obtain sample gas from the gas collection pipeline; a sampler, whose input end is detachably connected to the first output end of the diffusion pipeline, and the sampler is used to obtain part of the sample gas from the diffusion pipeline; and The post-processing pipeline has an input end which is detachably connected to the second output end of the diffusion pipeline or the output end of the sampler. The post-processing pipeline is provided with a processing pump, which is used to form a negative pressure state in the sampler and post-process the gas in the diffusion pipeline.

2. The nuclear power plant gas sampling device according to claim 1, characterized in that: The diffusion pipeline also includes: a diffusion box, whose input end is connected to the output end of the sampling gas pump, the diffusion box is provided with at least two output ends, and the diffusion box is used to store the sample gas; and An exhaust gas collection box, whose input end is connected to an output end of the diffusion box, and the exhaust gas collection box is used to collect the exhaust gas in the gas collection pipeline and the diffusion box before the sample gas is introduced into the diffusion pipeline; Wherein, the input end of the sampler can be detachably connected to the other output end of the diffusion box.

3. The nuclear power plant gas sampling device according to claim 2, characterized in that: The diffusion pipeline also includes: a first check valve, disposed between the output end of the sampling gas pump and the input end of the diffusion box; a second check valve, disposed between the output end of the diffusion tank and the input end of the tail gas collecting tank; and The third check valve is arranged at the output end of the tail gas collecting box.

4. The nuclear power plant gas sampling device according to claim 3, characterized in that: The diffusion pipeline also includes: a first valve, disposed between the output end of the diffusion tank and the second check valve; A second valve is provided at the output end of the diffusion box connected to the sampler; and The third valve is arranged between the output end of the tail gas collecting box and the third check valve.

5. The nuclear power plant gas sampling device according to claim 1, characterized in that: The diffusion pipeline further includes a first pressure gauge, which is disposed on the diffusion box and is used to measure the internal pressure of the diffusion box.

6. The nuclear power plant gas sampling device according to claim 1, characterized in that: The sampler comprises: a fourth valve, disposed at the input end of the sampler; a radioactive gas storage bottle, the input end of which is connected to the fourth valve and is used to store the sample gas; a fifth valve connected to the output end of the radioactive gas storage bottle; and The fourth check valve is arranged at the output end of the gas collecting pipeline.

7. The nuclear power plant gas sampling device according to claim 1, characterized in that: The sampler comprises: a sixth valve, disposed at a port of the sampler; and The non-radioactive gas storage bottle has an input end connected to the sixth valve.

8. The nuclear power plant gas sampling device according to claim 1, characterized in that: The post-processing pipeline also includes: The second pressure gauge is arranged at the input end of the post-processing pipeline, and the second pressure gauge is used to measure the pressure of the processing pump when it is working.

9. The nuclear power plant gas sampling device according to claim 1, characterized in that: Double-cutoff quick connectors are provided at the ports of the diffusion pipeline, the sampler and the post-processing pipeline.

10. The nuclear power plant gas sampling device according to claim 1, characterized in that: The sampling device further comprises a power supply module, and the power supply module is used to supply power to the diffusion pipeline, the sampler, and / or the post-processing pipeline.

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