A method and system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant

Abstract

The present invention discloses a method for shortening the gas sampling lag time in a high-temperature gas-cooled reactor nuclear power plant, comprising: S1, establishing a sampling pipeline system with multiple sections of pressure reduction on a process pipeline, and establishing a return pipeline system whose connection state is in a normally open state between a 0.1MPa pipeline segment and a process pipeline in the sampling pipeline system; S2, establishing a dynamic pressure stabilization module on the return pipeline system, and establishing a gas pressure dynamic adjustment rule; S3, closing the return pipeline system, controlling the gas sample to flow to the outlet only through the sampling pipeline system, and performing a gas sampling operation at the outlet of the sampling pipeline system; S4, after completing the sampling operation, controlling the gas sample to flow only into the return pipeline system, and under the regulation of the dynamic pressure stabilization module, restoring the dynamic balance between the gas sample pressure in the return pipeline system and the gas sample pressure in the 0.1MPa pipeline segment. The present invention enables the gas sample to reach the gas sampling instrument under normal pressure by only passing through a portion of the pipeline of the 0.1MPa pipeline segment when being sampled, thereby greatly shortening the sampling time.

Description

Technical Field

[0001] The invention relates to the technical field of high temperature gas-cooled reactor gas sampling, and in particular to a method and system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant. Background Art

[0002] At present, domestic high-temperature gas-cooled reactor nuclear power plants use gas sampling and analysis systems to achieve sampling and analysis of helium impurities. The sample gas pressure at the sampling point is as high as 7MPa, and the gas analyzer requires the inlet pressure to be normal pressure, so the sample gas at the sampling point needs to pass through a pressure reducing valve to reduce the pressure to 0.25MPa, and then further reduce the pressure to normal pressure (0.1MPa) through a flow controller, that is, the sampling pipeline needs to be composed of a 7MPa pipeline segment, a 0.25MPa pipeline segment, and a normal pressure pipeline segment connected in sequence. The time it takes for the sample gas to flow from the sampling point to the analyzer is the main factor affecting the measurement lag time. Since the volume of the sample gas at 7MPa pressure is 70 times the volume of the sample gas at normal pressure of 0.1MPa, the gas flow rate in the 7MPa sampling pipe section before the pressure reducing valve is one-seventieth of the flow rate at the analyzer outlet.

[0003] At the same time, since the gas chromatograph measures the impurity concentration of the sample gas intermittently, the "sampling control valve" is opened to start the sampling process only when measurement is required. Based on the above description, after evaluation, the sample gas needs to reach the gas chromatograph after opening the "sampling control valve" for 12.5 minutes (the sample gas flow rate at the inlet of the sampling instrument is about 56cm / min (0.1MPa); it is inferred that the sample gas flow rate of the 7MPa pipe section is 56÷(7÷0.1)=0.8cm / min; the original 7MPa pipeline length is about 10cm, so the measurement lag time is 12.5 minutes). Therefore, the current sampling measurement time is relatively long, resulting in less response time for the staff if there is a problem with the test result, and safety accidents may occur due to less response. At the same time, considering that the sampling pipeline and process pipeline in the existing high-temperature gas-cooled reactor nuclear power plant that have been built should not be shortened again to achieve the technical purpose of reducing the sampling time, it is necessary to propose a method and system for shortening the gas sampling lag time that can be applied to the already built high-temperature gas-cooled reactor nuclear power plant. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To achieve the above object, the present invention proposes a method for shortening the gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant, comprising the following steps:

[0006] S1. Select a gas sampling point on the process pipeline, and establish a multi-section pressure-reducing sampling pipeline system there. Establish a reflux pipeline system in a normally open state between the 0.1MPa pipeline section in the sampling pipeline system and the process pipeline;

[0007] S2. Establish a dynamic pressure stabilization module on the reflux pipeline system, and establish a dynamic pressure adjustment rule in the dynamic pressure stabilization module, and dynamically adjust the air pressure in the reflux pipeline system according to the adjustment rule to dynamically balance the air sample pressure in the 0.1MPa pipeline segment and the reflux pipeline system;

[0008] S3, close the reflux pipeline system, control the gas sample to flow to the outlet only through the sampling pipeline system, and perform gas sampling at the outlet of the sampling pipeline system;

[0009] S4. After completing the sampling operation, the gas sample is controlled to flow only into the reflux pipeline system, and under the regulation of the dynamic pressure stabilization module, the gas sample pressure in the reflux pipeline system and the gas sample pressure in the 0.1MPa pipeline section are restored to dynamic balance.

[0010] The present invention transforms the existing gas sample sampling pipeline, connects the 0.1MPa pipeline segment to the reflux point of the process pipeline through the reflux pipeline, so that before sampling, the sampling pipeline system and the reflux pipeline system are in a normally open state, and the gas sample forms a gas reflux through the sampling pipeline system and the reflux pipeline system under normal conditions, and under the action of the dynamic pressure stabilization module, it is ensured that the gas sample maintains a normal pressure state in the 0.1MPa pipeline segment, so that when the gas sample is sampled, it only needs to pass through part of the pipeline of the original 0.1MPa pipeline segment to reach the gas sampling instrument under normal pressure, thereby greatly shortening the sampling time.

[0011] Optionally, in S2, the gas sample pressure in the dynamic pressure stabilization module is detected in real time, and the air pressure dynamic adjustment rules include: when the gas sample pressure in the dynamic pressure stabilization module is greater than 0.12MPa, the gas sample in the return pipeline is accelerated to reduce the air pressure; when the gas sample pressure in the dynamic pressure stabilization module is less than 0.08MPa, the gas sample in the return pipeline is restored to a natural flow rate state to allow the air pressure to naturally increase to a normal pressure state.

[0012] Furthermore, in S1, the 7MPa pipeline segment and the 0.25MPa pipeline segment in the sampling pipeline system are in a flow state in both the sampling state and the non-sampling state; in the non-sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a disconnected state, and in the sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a flow state.

[0013] Furthermore, the reflux pipeline system is in a connection state with the 0.1MPa pipeline section in both the sampling state and the non-sampling state. When the sampling operation is performed, the 0.1MPa pipeline section and the reflux pipeline system are in a disconnected state.

[0014] Furthermore, a controllable system isolation process is performed on the 7MPa pipeline section of the sampling pipeline system near the sampling point to isolate the sampling pipeline system from the process system pipeline.

[0015] Furthermore, a controllable system isolation process is performed on the return piping system near the return point to isolate the return piping system from the process system pipeline.

[0016] The present application also provides a system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant, including a process pipeline, a sampling pipeline system, and a return pipeline system;

[0017] The process pipeline is provided with sampling points and reflux points in sequence along the flow direction of the gas sample;

[0018] A sampling pipeline system, comprising a 7MPa pipeline segment, a 0.25MPa pipeline segment and a 0.1MPa pipeline segment which are sequentially connected, the 7MPa pipeline segment being connected to a gas sampling point on the process pipeline, a pressure reducing valve being provided at the connection position between the 7MPa pipeline segment and the 0.25MPa pipeline segment, a three-way sampling control valve being provided at the connection position between the 0.25MPa pipeline segment and the 0.1MPa pipeline segment, and a pipeline at one end of the three-way sampling control valve being connected to a gas analysis instrument;

[0019] The reflux pipeline system includes a reflux pipeline arranged between the 0.1MPa pipeline segment and the process pipeline, one end of the reflux pipeline is connected to the other end of the three-way sampling control valve, the other end of the reflux pipeline is connected to the reflux point of the process pipeline, and a dynamic pressure stabilization module is arranged on the reflux pipeline.

[0020] Furthermore, the sampling pipeline system also includes a sampling controller arranged in the 0.25MPa pipeline section and a flow meter arranged in the 7MPa pipeline section.

[0021] Furthermore, the dynamic pressure stabilization module includes a pressure stabilizing tank connected to the return pipeline, an air pressure detection component is arranged in the pressure stabilizing tank, the air pressure detection component is electrically connected to the dynamic control station, and a flow rate regulating component is arranged on the return pipeline, and the flow rate regulating component is electrically connected to the dynamic control station.

[0022] Furthermore, isolation valves are provided on the reflux pipeline and the 7MPa pipeline section. The isolation valve on the reflux pipeline is provided between the flow rate regulating member and the reflux point of the process pipeline, and the isolation valve on the 7MPa pipeline section is provided between the flow meter and the sampling point on the process pipeline.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of the steps of a method for shortening the gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to the present invention;

[0026] Figure 2 A schematic flow chart of sampling steps of a method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to the present invention;

[0027] Figure 3 The present invention is a structural schematic diagram of another system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant.

[0028] Description of reference numerals:

[0029] 1. Process pipeline; 2. Sampling pipeline system; 3. Reflux pipeline system; 4. Pressure reducing valve; 5. Flow controller; 6. Three-way sampling control valve; 7. Pressure regulating tank; 8. Air pressure detection component; 9. Dynamic control station; 10. Flow rate adjustment component; 11. Isolation valve. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The present invention provides a method for shortening the gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant. Figure 1 to Figure 2 Elaborate in detail.

[0032] A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant comprises the following steps:

[0033] S1. Select a gas sampling point on the process pipeline 1, and establish a multi-stage pressure-reducing sampling pipeline system there. Establish a reflux pipeline system 3 in a normally connected state between the 0.1MPa pipeline segment of the sampling pipeline system and the process pipeline 1;

[0034] S2. Establish a dynamic pressure stabilization module on the reflux pipeline system 3, and establish a dynamic pressure adjustment rule in the dynamic pressure stabilization module, and dynamically adjust the air pressure in the reflux pipeline system 3 according to the adjustment rule, so that the air pressure in the 0.1MPa pipeline segment and the air sample pressure in the reflux pipeline system 3 are dynamically balanced;

[0035] S3, close the reflux pipeline system 3, control the gas sample to flow to the outlet only through the sampling pipeline system, and perform gas sampling at the outlet of the sampling pipeline system;

[0036] S4. After the sampling operation is completed, the gas sample is controlled to flow only into the reflux pipeline system 3, and under the regulation of the dynamic pressure stabilization module, the gas sample pressure in the reflux pipeline system 3 and the gas sample pressure in the 0.1MPa pipeline segment are restored to dynamic balance.

[0037] In the existing installed high-temperature gas-cooled reactor nuclear power plants, since the gas chromatograph measures the impurity concentration of the sample gas intermittently, the "sampling control valve" is opened to start the sampling process only when measurement is required. Based on the above description, after the "sampling control valve" is opened, it is evaluated that the sample gas needs to reach the gas chromatograph after 12.5 minutes. The 12.5-minute estimation process is as follows: the sample gas flow rate at the inlet of the sampling instrument is about 56cm / min (0.1MPa); it is inferred that the sample gas flow rate of the 7MPa pipe section is 56÷(7÷0.1)=0.8cm / min; the original 7MPa pipeline length is about 10cm, so the resulting measurement lag time is 12.5 minutes. Therefore, the current sampling measurement lag time is relatively long, resulting in less response time for staff if there is a problem with the test results.

[0038] In view of the above-mentioned problem, the present application proposes a method for shortening the gas sampling lag time in a high-temperature gas-cooled reactor nuclear power plant. By modifying the existing gas sample sampling pipeline, the 0.1MPa pipeline segment is connected to the reflux point of the process pipeline 1 through the reflux pipeline system 3, so that before sampling, the sampling pipeline system and the reflux pipeline system 3 are in a normally open state. Under normal conditions, the gas sample forms a gas reflux through the sampling pipeline system and the reflux pipeline system 3, and under the action of the dynamic pressure stabilization module, the gas sample is ensured to maintain a normal pressure state in the 0.1MPa pipeline segment, so that when the gas sample is sampled, it only needs to pass through part of the pipeline of the original 0.1MPa pipeline segment to reach the gas sampling instrument under normal pressure, thereby greatly shortening the sampling time.

[0039] In order to ensure that the gas sample can significantly shorten the flow distance during sampling, thereby achieving the purpose of reducing the lag time of gas sample collection, in S1, the 7MPa pipeline segment and the 0.25MPa pipeline segment in the sampling pipeline system are in a connection state in both the sampling state and the non-sampling state; in the non-sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a disconnected state, and in the sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a connection state; the return pipeline system 3 and the 0.1MPa pipeline segment are in a connection state in both the sampling state and the non-sampling state. When sampling operations are performed, the 0.1MPa pipeline segment and the return pipeline system 3 are in a disconnected state.

[0040] That is, in the non-sampling state, the gas in the process pipeline 1 will enter the sampling pipeline system along the sampling point. After the gas passes through the 7MPa pipeline segment, the 0.25MPa pipeline segment and part of the 0.1MPa pipeline segment in turn, it will not flow along the 0.1MPa pipeline segment to the pipeline outlet of the gas sampling, but will flow back to the process pipeline 1 through the reflux pipeline system 3. Since the sampling point on the process pipeline 1 is set at the upstream position of the reflux point, the gas has a natural pressure head from the sampling point to the reflux point. This ensures that in the normal non-sampling state, the gas maintains a flowing state in the sampling pipeline system and the reflux pipeline system 3, ensuring that when sampling, the gas in the 0.1MPa pipeline segment contains substantially the same substances as the gas in the process pipeline 1, thereby ensuring that the gas sample collected by this method is of reference significance.

[0041] At the same time, it is considered that due to the connection between the sampling pipeline system and the return pipeline system 3, the gas pressure in the 0.1MPa pipeline segment may not be within the normal pressure range, which will cause inaccurate data collection when the gas flows to the gas sampling instrument during sampling. Therefore, a dynamic pressure stabilization module is required to control the gas pressure of the gas sample in the return pipeline, and then adjust the gas pressure in the 0.1MPa pipeline segment connected to the return pipeline to ensure that the gas pressure in 0.1MPa is maintained at normal pressure when sampling. Therefore, it is necessary to dynamically detect and regulate the air pressure in the return pipe system 3 in the dynamic pressure stabilization module. In S2, the gas sample pressure in the dynamic pressure stabilization module is detected in real time, and the dynamic adjustment rules of the air pressure include: when the gas sample pressure in the dynamic pressure stabilization module is greater than 0.12MPa, the flow rate of the gas sample in the return pipe is accelerated to reduce the air pressure; when the gas sample pressure in the dynamic pressure stabilization module is less than 0.08MPa, the gas sample in the return pipe is restored to the natural flow rate state to allow the air pressure to naturally increase to normal pressure.

[0042] Furthermore, in order to ensure that the various systems do not interfere with each other, a controllable system isolation process is performed on the 7MPa pipeline section of the sampling pipeline system near the sampling point to isolate the sampling pipeline system 2 from the process system pipeline; a controllable system isolation process is performed on the return pipeline system 3 near the reflux point to isolate the return pipeline system 3 from the process system pipeline.

[0043] The present application also provides a system for shortening the gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant, as shown below. Figure 3 Elaborate in detail.

[0044] A system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant comprises a process pipeline 1, a sampling pipeline system and a return pipeline system 3;

[0045] The process pipeline 1 is provided with sampling points and reflux points in sequence along the gas sample flow direction, that is, the sampling point is provided at the upstream position of the reflux point, which ensures that there is a natural pressure head between the sampling point and the reflux point, so that the gas sample can enter the sampling pipeline system along the sampling point under the natural pressure head, flow through the reflux pipeline system 3, and finally flow back to the process pipeline 1 from the reflux point;

[0046] The sampling pipeline system includes a 7MPa pipeline segment, a 0.25MPa pipeline segment and a 0.1MPa pipeline segment which are connected in sequence, the 7MPa pipeline segment is connected to the gas sampling point on the process pipeline 1, a pressure reducing valve 4 is provided at the connection position between the 7MPa pipeline segment and the 0.25MPa pipeline segment, a three-way sampling control valve 6 is provided at the connection position between the 0.25MPa pipeline segment and the 0.1MPa pipeline segment, and a pipeline at one end of the three-way sampling control valve 6 is connected to a gas analysis instrument;

[0047] The reflux pipeline system 3 includes a reflux pipeline arranged between the 0.1MPa pipeline segment and the process pipeline 1, one end of the reflux pipeline is connected to the other end of the three-way sampling control valve 6, and the other end of the reflux pipeline is connected to the reflux point of the process pipeline 1. A dynamic pressure stabilization module is arranged on the reflux pipeline.

[0048] The three-way sampling control valve 6 has three ports ①, ②, and ③ as shown in the figure. In the non-sampling state, ports ① and ② are closed and in a cut-off state, and ports ① and ③ are connected; when sampling is performed, ports ① and ③ are closed and in a cut-off state, and ports ① and ② are connected.

[0049] In order to perform more detailed flow detection on the sampling pipeline system, the sampling pipeline system also includes a sampling controller arranged in the 0.25MPa pipeline section and a flow meter arranged in the 7MPa pipeline section. In some embodiments, a flow meter is also arranged in the 0.25MPa pipeline section to directly detect the gas sample flow in the 0.25MPa pipeline section.

[0050] In order to keep the gas pressure in the 0.1MPa pipeline segment at normal pressure, it is necessary to dynamically adjust the gas pressure in the return pipeline connected to the 0.1MPa pipeline segment, so that the gas pressure in the return pipeline is kept at normal pressure. Therefore, the dynamic pressure stabilization module includes a pressure stabilizing tank 7 connected to the return pipeline, and a pressure detection component is arranged in the pressure stabilizing tank 7. In this embodiment, the pressure detection component is arranged as a pressure measuring meter, and the pressure detection component is electrically connected to a dynamic control station 9. In this embodiment, the dynamic control station 9 is arranged as a PLC controller. A flow rate regulating component 10 is arranged on the return pipeline. In this embodiment, the flow rate regulating component 10 is arranged as an air pump, and the flow rate regulating component 10 is electrically connected to the dynamic control station 9.

[0051] Furthermore, the dynamic control station 9 includes a signal receiving unit, a judgment unit and an action control unit; the signal receiving unit is used to receive the pressure simulation signal transmitted to the dynamic control station 9 by the air pressure detection component, and output the pressure simulation signal to the judgment unit, the judgment unit performs judgment and processing on the pressure simulation signal, the judgment unit includes a filtering node and a signal conversion node, the air pressure of 0.08MPa-0.12MPa indicates that the air pressure is within the normal pressure range, so the filtering node filters the analog signal within this pressure range, and the filtered signal is transmitted to the signal conversion node, when the signal conversion node receives a signal with a pressure greater than 0.12MPa, the signal conversion node outputs a flow rate adjustment component 10 opening signal to the action control unit, the action control unit controls the flow rate adjustment component 10 to open, and accelerates the gas flow rate in the reflux pipe; when the signal conversion node receives a signal with a pressure less than 0.08MPa, the signal conversion node outputs a flow rate adjustment component 10 closing signal to the action control unit, the action control unit controls the flow rate adjustment component 10 to close, so that the gas flow rate in the reflux pipe returns to normal. Therefore, when the gas flows from the sampling point through the sampling pipeline system and the reflux pipeline system 3 and finally to the reflux point, the natural pressure head is always dynamically maintained, thereby ensuring the circulation of the gas.

[0052] In order to achieve isolation between the various systems and avoid unnecessary interference between the various systems, isolation valves 11 are provided on the reflux pipeline and the 7MPa pipeline section. The isolation valve 11 on the reflux pipeline is provided between the flow rate regulating member 10 and the reflux point of the process pipeline 1, and the isolation valve 11 on the 7MPa pipeline section is provided between the flow meter and the sampling point on the process pipeline 1.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant, characterized in that: The following steps are involved: S1. Select a gas sampling point on the process pipeline and establish a multi-section pressure-reducing sampling pipeline system there. The sampling pipeline system includes a 7MPa pipeline segment, a 0.25MPa pipeline segment and a 0.1MPa pipeline segment which are connected in sequence. A reflux pipeline system is established between the 0.1MPa pipeline segment and the process pipeline in the sampling pipeline system. The connection state is in a normally open state. S2. Establish a dynamic pressure stabilization module on the reflux pipeline system, and establish a dynamic pressure adjustment rule in the dynamic pressure stabilization module, and dynamically adjust the air pressure in the reflux pipeline system according to the adjustment rule to dynamically balance the air sample pressure in the 0.1MPa pipeline segment and the reflux pipeline system; The gas sample pressure in the dynamic pressure stabilization module is detected in real time, and the dynamic pressure adjustment rules include: when the gas sample pressure in the dynamic pressure stabilization module is greater than 0.12MPa, the gas sample in the return pipeline is accelerated to reduce the gas pressure; when the gas sample pressure in the dynamic pressure stabilization module is less than 0.08MPa, the gas sample in the return pipeline is restored to a natural flow rate state, so that the gas pressure naturally increases to a normal pressure state; S3, close the reflux pipeline system, control the gas sample to flow to the outlet only through the sampling pipeline system, and perform gas sampling at the outlet of the sampling pipeline system; S4. After completing the sampling operation, the gas sample is controlled to flow only into the reflux pipeline system, and under the regulation of the dynamic pressure stabilization module, the gas sample pressure in the reflux pipeline system and the gas sample pressure in the 0.1MPa pipeline section are restored to dynamic balance.

2. A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that: In S1, the 7MPa pipeline segment and the 0.25MPa pipeline segment in the sampling pipeline system are in a connected state in both the sampling state and the non-sampling state; in the non-sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a disconnected state, and in the sampling state, the pipeline of the 0.1MPa pipeline segment toward the pipeline outlet is in a connected state.

3. A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that: The reflux pipeline system is in a connection state with the 0.1MPa pipeline section in both the sampling state and the non-sampling state. When the sampling operation is performed, the 0.1MPa pipeline section and the reflux pipeline system are in a disconnected state.

4. A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that: Controllable system isolation treatment is performed on the 7MPa pipeline section of the sampling pipeline system near the sampling point to isolate the sampling pipeline system from the process system pipeline.

5. A method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that: Controllable system isolation is performed on the return piping system close to the return point to isolate the return piping system from the process system pipeline.

6. A system for implementing the method for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant as claimed in claim 1, characterized in that: Including process pipelines, sampling pipeline systems and return pipeline systems; The process pipeline is provided with sampling points and reflux points in sequence along the flow direction of the gas sample; A sampling pipeline system, comprising a 7MPa pipeline segment, a 0.25MPa pipeline segment and a 0.1MPa pipeline segment which are sequentially connected, the 7MPa pipeline segment being connected to a gas sampling point on the process pipeline, a pressure reducing valve being provided at the connection position between the 7MPa pipeline segment and the 0.25MPa pipeline segment, a three-way sampling control valve being provided at the connection position between the 0.25MPa pipeline segment and the 0.1MPa pipeline segment, and a pipeline at one end of the three-way sampling control valve being connected to a gas analysis instrument; The reflux pipeline system includes a reflux pipeline arranged between the 0.1MPa pipeline segment and the process pipeline, one end of the reflux pipeline is connected to the other end of the three-way sampling control valve, the other end of the reflux pipeline is connected to the reflux point of the process pipeline, and a dynamic pressure stabilization module is arranged on the reflux pipeline.

7. A system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that: The sampling pipeline system also includes a sampling controller arranged in the 0.25MPa pipeline section and a flow meter arranged in the 7MPa pipeline section.

8. A system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that: The dynamic pressure stabilization module includes a pressure stabilizing tank connected to the return pipeline, an air pressure detection component is arranged in the pressure stabilizing tank, the air pressure detection component is electrically connected to the dynamic control station, and a flow rate regulating component is arranged on the return pipeline, and the flow rate regulating component is electrically connected to the dynamic control station.

9. A system for shortening gas sampling lag time in a high temperature gas-cooled reactor nuclear power plant according to claim 8, characterized in that: Isolation valves are provided on the reflux pipeline and the 7MPa pipeline section. The isolation valve on the reflux pipeline is provided between the flow rate regulating component and the reflux point of the process pipeline, and the isolation valve on the 7MPa pipeline section is provided between the flow meter and the sampling point on the process pipeline.

Images