Pipeline leakage monitoring system, gas concentration monitoring method and equipment

Abstract

The invention discloses a pipeline leakage monitoring system, a gas concentration monitoring method and equipment. A to-be-detected pipeline is located in a high-irradiation environment; the pipeline leakage monitoring system comprises a main cabinet, a front cabinet and a monitoring device, the monitoring device is located in a first working area, is arranged on the outer wall surface of a to-be-detected pipeline and is connected with the front cabinet; the front cabinet is arranged in a second working area and is used for adjusting the gas flow to keep stable and detecting the gas concentration of a target component in the to-be-detected pipeline; the main cabinet is arranged in a third working area, is connected with the front cabinet and is used for controlling the front cabinet and monitoring the to-be-detected pipeline according to the gas concentration; the radiation of the first working area is higher than that of the second working area; the radiation of the second working area is higher than that of the third working area. And the long-term stable real-time monitoring of the gas concentration in a special environment is realized.

Description

Technical Field

[0001] The present invention relates to the field of pipeline monitoring, and in particular to a pipeline leakage monitoring system, a gas concentration monitoring method and device. Background Art

[0002] Steam pipelines are generally used to transport high-temperature and high-pressure steam, and leakage of which is extremely likely to cause safety hazards. Especially for the main steam pipeline in the secondary loop of a pressurized water reactor nuclear power plant, once the main steam pipeline leaks, the jet of high-temperature and high-pressure steam will threaten the safety of the reactor.

[0003] At this time, it is necessary to monitor the gas concentration in high-temperature and irradiated environments such as around the main steam pipeline, around the pressure vessel or near the safety valve pressure relief port in real time. Existing instruments cannot operate normally in such environments or can only operate normally in such environments for a short time, making it difficult to obtain reliable monitoring data and impossible to achieve long-term stable real-time monitoring of gas concentration. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the gas concentration in high-temperature or irradiated environments cannot be monitored in real time for a long time in the prior art. The present invention provides a pipeline leakage monitoring system, a gas concentration monitoring method and device.

[0005] In a first aspect, a pipeline leakage monitoring system is provided, where the pipeline to be measured is located in a high-irradiation environment; the pipeline leakage monitoring system includes a main cabinet, a front cabinet, and a monitoring device;

[0006] The monitoring device is located in a first working area, is arranged on the outer wall surface of the pipeline to be measured and is connected to the front cabinet;

[0007] The front cabinet is arranged in a second working area, and the front cabinet is used to adjust the gas flow rate to be stable and detect the gas concentration of the target component in the pipeline to be measured;

[0008] The main cabinet is arranged in a third working area, the main cabinet is connected to the front cabinet, and is used to control the front cabinet and monitor the pipeline to be measured according to the gas concentration;

[0009] The radiation in the first working area is higher than the radiation in the second working area; the radiation in the second working area is higher than the radiation in the third working area.

[0010] Optionally, the front cabinet includes:

[0011] A first solenoid valve for controlling the opening and closing of the air inlet of the monitoring device;

[0012] A second solenoid valve for controlling the opening and closing of the air outlet of the monitoring device;

[0013] A first flow regulating valve, which is used to regulate the gas flow of an external gas source and keep the air in the monitoring device flowing stably from the air inlet to the air outlet;

[0014] A gas analyzer, which is used to measure the gas concentration of the target component in the gas flowing into the gas analyzer of the monitoring device;

[0015] A monitoring bypass, which is used to calibrate the gas analyzer and stabilize the bypass gas flow.

[0016] Optionally, the front cabinet includes: a flow sensor, a temperature sensor, a third solenoid valve, and a second flow regulating valve;

[0017] One end of the flow sensor is connected to an external gas source, and the other end is connected to the air inlet of the monitoring device through the first flow regulating valve;

[0018] The air outlet of the monitoring device is connected to the air inlet of the gas analyzer through the temperature sensor;

[0019] The air outlet of the gas analyzer is connected to an exhaust device;

[0020] The monitoring bypass is that the air outlet of the monitoring device is connected to the air inlet of the monitoring device through the second flow regulating valve and the third solenoid valve in sequence;

[0021] The second flow regulating valve is used to stabilize the bypass gas flow;

[0022] The temperature sensor is used to measure the gas temperature at the air inlet of the gas analyzer;

[0023] The flow sensor is used to measure the gas flow at the air inlet of the monitoring device.

[0024] Optionally, the front cabinet includes: a pressure reducing valve, a pressure sensor, a first stop valve, and a second stop valve;

[0025] The external gas source is connected to the pressure reducing valve through the first stop valve; the pressure reducing valve and the pressure sensor are connected to the flow sensor;

[0026] The gas analyzer is connected to the exhaust device through the second stop valve;

[0027] The pressure sensor is used to measure the gas pressure at the air outlet of the pressure reducing valve.

[0028] Optionally, the monitoring device of the pipeline leakage monitoring system includes;

[0029] An instrument pipe, which is arranged on the outer wall surface of the pipeline to be measured;

[0030] The penetration component is arranged at the monitoring point and is connected to the front cabinet through the instrument pipeline;

[0031] The instrument pipeline and the penetration component are made of metal.

[0032] Optionally, the pipeline leakage monitoring system includes multiple monitoring devices;

[0033] The instrument pipelines of the multiple monitoring devices are connected to the front cabinet. The air inlet and outlet of the instrument pipeline are controlled by solenoid valves. The main cabinet controls the solenoid valves to switch different pipelines to be measured, so as to monitor multiple pipelines to be measured.

[0034] Optionally, the main cabinet and the front cabinet of the pipeline leakage monitoring system are connected through a signal optical cable and a signal cable. The signal optical cable is used to transmit sensor data and control signals, and the signal cable is used to transmit the front cabinet fault signal.

[0035] Optionally, the main cabinet includes:

[0036] An analysis module for analyzing and processing the sensor data obtained by the front cabinet;

[0037] Optionally, it further includes a display module for displaying the data processed by the analysis module;

[0038] Optionally, it further includes an alarm module for alarming when the data analyzed by the analysis module is abnormal;

[0039] Optionally, it further includes a switching module for switching between the remote mode and the local mode;

[0040] Optionally, it further includes a backup power supply for supplying power to the system in the main cabinet in case of external power failure.

[0041] In a second aspect, a gas concentration monitoring method is provided. The gas concentration monitoring method is implemented by the pipeline leakage monitoring system described above. The gas concentration monitoring method includes:

[0042] Controlling the gas flow;

[0043] Detecting the gas concentration of the target component in the pipeline to be measured;

[0044] Monitoring the pipeline to be measured according to the gas concentration.

[0045] In a third aspect, a gas concentration monitoring device for a nuclear power plant is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. The feature is that when the processor executes the computer program, the above-mentioned gas concentration monitoring method is implemented.

[0046] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0047] The positive and progressive effects of the present invention are as follows: separating pipeline monitoring control from monitoring, setting up a main cabinet and a front cabinet, and being able to perform long-term real-time monitoring of the gas concentration in pipelines in high-temperature or irradiated environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 FIG. is a schematic structural diagram of a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0049] Figure 2 FIG. is a schematic structural diagram of a front cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0050] Figure 3 FIG. is a front view of a main cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0051] Figure 4 FIG. is a left view of a main cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0052] Figure 5 FIG. is a top view of a main cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0053] Figure 6 FIG. is a front view (without a door) of a main cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0054] Figure 7 FIG. is a front view of a front cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0055] Figure 8 FIG. is a left view of a front cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0056] Figure 9 FIG. is a right view of a front cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0057] Figure 10 FIG. is a top view of a front cabinet in a pipeline leakage monitoring system provided for an exemplary embodiment of the present invention.

[0058] Figure 11 FIG. is a schematic diagram of the steps of a gas concentration monitoring method provided for an exemplary embodiment of the present invention.

[0059] Figure 12Schematic diagram of the structure of an electronic device of a gas concentration monitoring device shown in an exemplary embodiment of the present invention. Detailed implementation manners

[0060] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the described embodiments.

[0061] As Figure 1 described, an embodiment of the present invention provides a pipeline leakage monitoring system, and the pipeline to be measured is located in a high-irradiation environment; the pipeline leakage monitoring system includes a main cabinet 1, a front cabinet 2, and a monitoring device 3;

[0062] The monitoring device 3 is located in the first working area, is arranged on the outer wall surface of the pipeline to be measured and is connected to the front cabinet 2;

[0063] The front cabinet 2 is arranged in the second working area, and the front cabinet 2 is used to adjust the gas flow to be stable and detect the gas concentration of the target component in the pipeline to be measured;

[0064] The main cabinet 1 is arranged in the third working area, the main cabinet 1 is connected to the front cabinet 2, is used to control the front cabinet 2, and monitor the pipeline to be measured according to the gas concentration;

[0065] The radiation in the first working area is higher than that in the second working area; the radiation in the second working area is higher than that in the third working area.

[0066] Specifically, the pipeline to be measured 3 is located in the high-radiation area inside the containment vessel. A monitoring device containing measuring elements is arranged along the pipeline to be measured. The monitoring device 3 can monitor the steam concentration around the measuring elements to judge whether the pipeline leaks. The monitoring device 3 is connected to the front cabinet 2.

[0067] The front cabinet 2 is arranged in the low-irradiation area inside the containment vessel. Clean and dry compressed air needs to be provided on site. The exhaust gas is measured and discharged into the on-site exhaust gas pipeline or the exhaust gas recovery system. The front cabinet 2 and the main cabinet 1 are connected by a signal optical cable and a signal cable passing through the containment vessel. There are electrical components such as a power supply, a PLC, an AI / AO module, a signal transmitter, a switch, etc. and components such as valves, pipelines, sensors, etc. inside the front cabinet. The PLC and AI / AO modules inside the cabinet are used to collect the data of each sensor and send it to the main cabinet through the switch, and at the same time receive control signals to control the solenoid valve and the flow regulating valve.

[0068] The main cabinet 1 is arranged outside the containment vessel, sends control signals according to preset programs and parameters, processes and analyzes the original data of each instrument in the front cabinet 2, gives an alarm locally when a leakage or other faults are detected according to the results, and sends an alarm signal to the on-site upper computer. At the same time, the main cabinet 1 also displays the system operation status in real time through the display panel.

[0069] The overall system only arranges the necessary components in the front cabinet, and all other key equipment is arranged in the main cabinet. The main cabinet can be arranged at a remote location with suitable environmental conditions for remote monitoring.

[0070] In this embodiment, the pipeline monitoring control and monitoring are separated, and the main cabinet and the front cabinet are set up, which can perform long-term real-time monitoring on the gas concentration in the pipeline in a high-temperature or irradiated environment, being safe, reliable, easy to operate, and also facilitating maintenance personnel for maintenance.

[0071] As Figure 2 shown, in one embodiment, the front cabinet includes:

[0072] The first solenoid valve 21, which is used to control the opening and closing of the air inlet of the monitoring device;

[0073] The second solenoid valve 22, which is used to control the opening and closing of the air outlet of the monitoring device;

[0074] The first flow regulating valve 23, which is used to regulate the gas flow of the external gas source and keep the air in the monitoring device flowing stably from the air inlet to the air outlet;

[0075] The gas analyzer 24, which is used to measure the gas concentration of the target component in the gas flowing into the gas analyzer of the monitoring device;

[0076] The monitoring bypass, which is used to calibrate the gas analyzer and stabilize the bypass gas flow.

[0077] Specifically, the working state of the front cabinet includes two states, namely the gas permeation stage and the gas monitoring stage. At the moment of switching from the gas permeation stage to the gas monitoring stage, due to the change in the gas flow path in the gas concentration monitoring device, the gas flow in the gas concentration monitoring device is likely to fluctuate, affecting the accuracy of the gas concentration monitoring result. Therefore, in the gas permeation stage, the main control cabinet 1 adjusts the opening degree of the monitoring bypass, so that the gas flow in the gas concentration monitoring device remains stable and is consistent with the gas flow in the gas monitoring stage, improving the stability of the gas flow in the gas monitoring stage. At the same time, the clean and dry compressed air directly from the external gas source flows in the monitoring bypass at this time, which can clean the internal flow path of the gas analyzer 24 and calibrate the reference point of the gas analyzer 24, improving the accuracy of the gas concentration monitoring result. During this period, the opening degree of the first flow regulating valve 23 remains unchanged.

[0078] In the gas monitoring stage, the main control cabinet 1 is also used to control the first solenoid valve 21 and the second solenoid valve 22 to open, close the bypass, and adjust the opening degree of the first flow regulating valve 23 according to the gas flow.

[0079] Among them, the external air source provides clean and dry compressed air for the pre-chamber cabinet. The pressure of the compressed air can be determined according to the actual situation. Generally, compressed air with 6-8 atmospheres can be selected, and this embodiment does not limit this.

[0080] The gas analyzer 24 uses tunable diode laser absorption spectroscopy (TDLAS) to measure the components of the gas returning from the measurement pipeline.

[0081] In this embodiment, the first flow regulating valve is used to keep the gas flow in the pipeline stable, and the gas analyzer is calibrated through the monitoring bypass, thereby improving the accuracy of the gas concentration monitoring result.

[0082] In one embodiment, the pre-chamber cabinet includes: a flow sensor 25, a temperature sensor 26, a third solenoid valve 27, and a second flow regulating valve 28;

[0083] One end of the flow sensor 25 is connected to the external air source, and the other end is connected to the air inlet of the monitoring device through the first flow regulating valve 23;

[0084] The air outlet of the monitoring device is connected to the air inlet of the gas analyzer 24 through the temperature sensor 26;

[0085] The air outlet of the gas analyzer 24 is connected to the exhaust device;

[0086] The monitoring bypass is that the air outlet of the monitoring device is sequentially connected to the air inlet of the monitoring device through the second flow regulating valve 28 and the third solenoid valve 27;

[0087] The second flow regulating valve is used to stabilize the bypass air flow;

[0088] The temperature sensor 26 is used to measure the gas temperature at the air inlet of the gas analyzer;

[0089] The flow sensor 25 is used to measure the gas flow at the air inlet of the monitoring device.

[0090] Specifically, in the gas permeation stage, the main cabinet adjusts the opening of the second flow regulating valve 28 according to the gas flow measured by the flow sensor 25, so that the gas flow in the gas concentration monitoring device remains stable and is consistent with the gas flow in the gas monitoring stage, improving the stability of the gas flow in the gas monitoring stage. During this period, the opening of the first flow regulating valve 23 remains unchanged. In the gas monitoring stage, the main cabinet controls the first solenoid valve 21 and the second solenoid valve 22 to open, controls the third solenoid valve 27 to close, and adjusts the opening of the first flow regulating valve 23 according to the gas flow measured by the flow sensor 25, so that the gas flow in the gas concentration monitoring device remains stable, improving the accuracy of the gas concentration monitoring result. During this period, the opening of the second flow regulating valve 28 remains unchanged.

[0091] The temperature sensor 26 is used to measure the gas temperature at the air inlet of the gas analyzer. The main cabinet can specifically calculate the leakage location based on the gas temperature, the measurement data in the gas analyzer 24, and the monitoring device.

[0092] Specifically, if the gas analyzer 24 measures a total of n maximum values in a certain working cycle, and the durations required to appear the maximum values are t1, t2,..., t n , and the corresponding maximum values are M1, M2,..., M n , and the pipeline lengths between the monitoring points in the monitoring device corresponding to each air mass and the gas analyzer 24 are denoted as L1, L2,..., L n , then the pipeline length between the monitoring point in the corresponding monitoring device and the gas analyzer can be determined by the following formula:

[0093]

[0094] Wherein, T0 represents the environmental reference temperature, T1 represents the gas temperature measured by the temperature sensor, L0 represents the reference length at the end of the monitoring device, which is determined according to the parameters of the monitoring device; a is a constant determined according to the parameters of the monitoring device, and Q is the gas flow measured by the flow sensor.

[0095] If the gas concentrations of the target components at the monitoring points corresponding to the maximum values of each gas concentration are denoted as R1, R2,..., R n , then the gas concentration of the target component at the corresponding monitoring point can be obtained according to the gas concentration by the following formula:

[0096]

[0097] Wherein, b, c, and d are all constants determined by the relevant parameters of the monitoring device, and e is the natural constant.

[0098] Based on the calculated L k and matching with the pipeline lengths from the monitoring points in each monitoring device to the gas analyzer, the permeation component corresponding to the current air mass can be obtained, and R k is the concentration value of the target component around this permeation component.

[0099] In one embodiment, the front cabinet includes: a pressure reducing valve 29, a pressure sensor 30, a first stop valve 31, and a second stop valve 32;

[0100] The external gas source is connected to the pressure reducing valve 29 through the first stop valve 31; the pressure reducing valve 29 and the pressure sensor 30 are connected to the flow sensor;

[0101] The gas analyzer 24 is connected to the exhaust device through the second stop valve 32;

[0102] The pressure sensor 30 is used to measure the gas pressure at the outlet of the pressure reducing valve 29.

[0103] Specifically, since the air pressure provided by the external air source is generally high, if the air provided by the external air source is directly used as the gas in the gas concentration monitoring device, the flow sensor 25 and the first flow regulating valve 23 cannot work under the best working conditions, resulting in a decrease in the accuracy of the gas concentration monitoring result. Therefore, the gas pressure in the gas concentration monitoring device is reduced by the pressure reducing valve 29. Specifically, how much the gas pressure is reduced can be determined according to the parameters of the flow sensor 25 and the first flow regulating valve 23.

[0104] Furthermore, a pressure relief valve 33 can be set. The pressure relief valve 33 is used to prevent overpressure at the front end. When the inlet pressure at the front end is too high, the pressure relief valve opens to relieve pressure, and the waste gas is discharged through the pipeline to prevent high pressure from damaging the equipment at the rear end.

[0105] In this embodiment, through the pressure reducing valve, the entire front cabinet works under the best working conditions, further improving the measurement accuracy.

[0106] In one embodiment, the monitoring device of the pipeline leakage monitoring system includes;

[0107] Instrument pipe, which is arranged on the outer wall surface of the pipeline to be measured;

[0108] Penetration component, which is arranged at the monitoring point and is connected to the front cabinet through the instrument pipeline;

[0109] The instrument pipe and the penetration component are made of metal.

[0110] Specifically, the monitoring device includes an instrument pipe and a measuring element, all of which are metal components and have no moving parts. The penetration component is arranged at the monitoring point. During the gas penetration stage, the main cabinet controls the first solenoid valve 21 and the second solenoid valve 22 to close, and there is no gas flow in the loop of the monitoring device. The concentration of the target component in the gas around the penetration component is higher than the concentration of the target component in the gas in the instrument pipeline. Under the action of the concentration difference, due to the penetration effect, the target component will enter the instrument pipeline through the penetration area, and a gas mass containing the target component will be formed in a section of the instrument pipeline before and after the penetration component. During the gas monitoring stage, the main cabinet controls the first solenoid valve 21 and the second solenoid valve 22 to open and controls the third solenoid valve 27 to close. At this time, the monitoring device loop is opened, and compressed air flows through the monitoring device loop. The gas mass containing the target component advances in the instrument pipeline under the action of the compressed gas. When the gas mass flows through the gas analyzer 24, the maximum measured value of the concentration of the target component can be obtained. The gas analyzer 24 measures the concentration of the target component in the gas mass corresponding to each penetration component in turn.

[0111] In this embodiment, the pipeline to be measured is monitored through the permeation component and the instrument tube, which has a long service life and high reliability and can withstand harsh environments such as high temperature and high irradiation.

[0112] In one embodiment, the pipeline leakage monitoring system includes a multi-channel monitoring device;

[0113] The instrument tubes of the multi-channel monitoring device are connected to the front cabinet. The air inlet and outlet of the instrument tubes are controlled by solenoid valves, and the main cabinet controls the solenoid valves to switch different pipelines to be measured, so as to monitor multiple pipelines to be measured.

[0114] Specifically, a multi-channel monitoring device can be set, and solenoid valves can be set at the air inlet and outlet of the multi-channel monitoring device. In this embodiment, through the control of the main cabinet, different pipelines to be measured can be switched, so as to monitor multiple pipelines to be measured.

[0115] In one embodiment, the main cabinet and the front cabinet of the pipeline leakage monitoring system are connected by a signal optical cable and a signal cable. The signal optical cable is used to transmit sensor data and control signals, and the signal cable is used to transmit the front cabinet fault signal.

[0116] The front cabinet and the main cabinet are connected by a signal optical cable and a signal cable passing through the containment. The optical cable is used to transmit the control signal from the main cabinet to the front cabinet and the original data collected by each instrument in the front cabinet, and the cable is used to transmit some key alarm signals (such as power failure of the front cabinet, switch failure, etc.).

[0117] In this embodiment, the main cabinet and the front cabinet can communicate in real time through the signal optical cable to achieve the function of monitoring the pipeline; the signal cable can timely reflect the faults of the front cabinet and ensure the stability of the system.

[0118] In one embodiment, the main cabinet includes an analysis module for analyzing and processing the sensor data obtained by the front cabinet;

[0119] In one embodiment, the main cabinet further includes a display module for displaying the data processed by the analysis module;

[0120] In one embodiment, the main cabinet further includes an alarm module for alarming when the data analyzed by the analysis module is abnormal;

[0121] In one embodiment, the main cabinet further includes a switching module for switching between the remote mode and the local mode;

[0122] In one embodiment, the main machine further includes a backup power supply for supplying power to the system in the main cabinet in the event of an external power outage.

[0123] Such as Figure 3The touch display screen of the shown main cabinet can display the system status and can also set the key parameters and operating status in the system; the indicator lights can indicate the current operating mode, and the corresponding indicator lights or audible and visual alarms will light up when a leak or other fault is detected; the control knob is used to switch different operating modes, for switching between the remote mode and the local mode, and can perform remote or local operations on the main cabinet.

[0124] As Figure 6 shown, there are electrical components such as UPS, industrial computer, KVM, power supply, PLC, and switch in the specific main cabinet. The main control and data acquisition of the system are carried out through the PLC; the collected original data is processed and analyzed by the industrial computer, and the results are transmitted for display and alarm. The industrial computer will also save the original data and results for no less than 2 years for future query. The UPS is used to supply power to the equipment in the main cabinet in case of external power failure, ensuring the completion of data saving and the sending of alarm signals, and increasing the reliability of the system.

[0125] As Figure 4 shown, the cooling fans of the main cabinet are arranged at the upper left of the cabinet body. The relevant cables of the main cabinet, including the power supply line, the signal line with the on-site upper computer, and the signal optical cable and signal cable connected to the front cabinet, Figure 5 are led out through the wire-passing hole plate on the top of the cabinet as shown.

[0126] As Figure 7 shown, there are electrical components such as power supply, PLC, AI / AO module, signal transmitter, and switch in the front cabinet, as well as components such as valves, pipelines, and sensors. As Figure 8 the on-site gas supply pipeline and the waste gas discharge pipeline pass through the intake and exhaust pipe through-hole plate on the left side of the front cabinet. As Figure 9 shown, the measurement pipeline passes through the measurement pipe through-hole plate on the right side of the front cabinet. As Figure 10 shown, the signal optical cable, signal cable connecting the front cabinet to the main unit, and the power supply cable of the front cabinet pass through the wire-passing hole plate on the top of the front cabinet,

[0127] After the system is started, it can be monitored unattended and fully automatically. When a leak or other fault is detected, the main cabinet will send out a local alarm signal and display detailed information, and at the same time send a remote alarm signal to the on-site upper computer. The system can set parameters and perform local control in the main cabinet, or can be remotely controlled by the upper computer through remote signals.

[0128] In this embodiment, the main cabinet can monitor the pipeline to be measured in real time through multiple modules, which is safe, reliable, easy to operate, and convenient for maintenance personnel to perform repairs.

[0129] As Figure 11As shown in the figure, the present invention provides a gas concentration monitoring method, which is implemented by the pipeline leakage monitoring system described above. The gas concentration monitoring method includes:

[0130] S1 Control the gas flow rate;

[0131] S2 Detect the gas concentration of the target component in the pipeline to be measured;

[0132] S3 Monitor the pipeline to be measured according to the gas concentration.

[0133] In this embodiment, by controlling the gas flow rate, the reliability of the monitoring data is improved, and the long-term stable real-time monitoring of the gas concentration in a high-temperature or irradiated environment is realized.

[0134] Figure 12 FIG. is a schematic structural diagram of an electronic device shown in an exemplary embodiment of the present invention, showing a block diagram of an exemplary electronic device 50 suitable for implementing the embodiments of the present invention. Figure 12 The displayed electronic device 50 is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present invention.

[0135] As Figure 12 shown, the electronic device 50 can be presented in the form of a general computing device, for example, it can be a server device. The components of the electronic device 50 may include but are not limited to: at least one of the above-mentioned processors 51, at least one of the above-mentioned memories 52, and a bus 53 connecting different system components (including the memory 52 and the processor 51).

[0136] The bus 53 includes a data bus, an address bus, and a control bus.

[0137] The memory 52 may include volatile memory, such as a random access memory (RAM) 521 and / or a cache memory 522, and may further include a read-only memory (ROM) 523.

[0138] The memory 52 may further include a program tool 525 (or utility) having a set of (at least one) program modules 524. Such program modules 524 include but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0139] The processor 51 executes various functional applications and data processing by running computer programs stored in the memory 52, such as the gas concentration monitoring method provided in the above embodiment.

[0140] The electronic device 50 may also communicate with one or more external devices 54 (such as a keyboard, a pointing device, etc.). Such communication may be carried out through the input / output (I / O) interface 55. Moreover, the electronic device 50 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through the network adapter 56. As shown in the figure, the network adapter 56 communicates with other modules of the electronic device 50 where the model is generated through the bus 53. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in combination with the electronic device 50 where the model is generated, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (redundant array of independent disks) systems, tape drives, and data backup storage systems, etc.

[0141] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only for illustration purposes. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art may make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A pipeline leakage monitoring system, characterized in that, The pipeline to be measured is located in a high-irradiation environment; the pipeline leakage monitoring system includes a main cabinet, a front cabinet, and a monitoring device; The monitoring device is located in the first working area, is arranged on the outer wall surface of the pipeline to be measured, and is connected to the front cabinet; The front cabinet is arranged in the second working area, and the front cabinet is used to adjust the gas flow to keep it stable and detect the gas concentration of the target component in the pipeline to be measured; The main cabinet is arranged in the third working area, the main cabinet is connected to the front cabinet, is used to control the front cabinet, and monitors the pipeline to be measured according to the gas concentration; The radiation in the first working area is higher than the radiation in the second working area; the radiation in the second working area is higher than the radiation in the third working area.

2. The pipeline leakage monitoring system according to claim 1, characterized in that The front cabinet includes: A first solenoid valve for controlling the opening and closing of the air inlet of the monitoring device; A second solenoid valve for controlling the opening and closing of the air outlet of the monitoring device; A first flow regulating valve for regulating the gas flow of the external gas source, keeping it stable and driving the air in the monitoring device to flow from the air inlet to the air outlet; A gas analyzer for measuring the gas concentration of the target component in the gas flowing into the gas analyzer from the monitoring device; A monitoring bypass for calibrating the gas analyzer and stabilizing the bypass gas flow.

3. The pipeline leakage monitoring system according to claim 2, characterized in that, The front cabinet includes: a flow sensor, a temperature sensor, a third solenoid valve, and a second flow regulating valve; One end of the flow sensor is connected to the external gas source, and the other end is connected to the air inlet of the monitoring device through the first flow regulating valve; The air outlet of the monitoring device is connected to the air inlet of the gas analyzer through the temperature sensor; The air outlet of the gas analyzer is connected to an exhaust device; The monitoring bypass is that the air outlet of the monitoring device is successively connected to the air inlet of the monitoring device through the second flow regulating valve and the third solenoid valve; The second flow regulating valve is used to stabilize the bypass gas flow; The temperature sensor is used to measure the gas temperature at the air inlet of the gas analyzer; The flow sensor is used to measure the gas flow at the air inlet of the monitoring device.

4. The pipeline leakage monitoring system according to claim 3, characterized in that, The front cabinet includes: a pressure reducing valve, a pressure sensor, a first stop valve, and a second stop valve; The external gas source is connected to the pressure reducing valve through the first stop valve; the pressure reducing valve and the pressure sensor are connected to the flow sensor; The gas analyzer is connected to the exhaust device through the second stop valve; The pressure sensor is used to measure the gas pressure at the air outlet of the pressure reducing valve.

5. The pipeline leakage monitoring system according to claim 1, characterized in that, The monitoring device of the pipeline leakage monitoring system includes; An instrument pipe, and the instrument pipe is arranged on the outer wall surface of the pipeline to be measured; A permeation component, which is arranged at the monitoring point and is connected to the front cabinet through the instrument pipeline; The instrument pipe and the permeation component are made of metal.

6. The pipeline leakage monitoring system according to claim 5, characterized in that, The pipeline leakage monitoring system includes multiple monitoring devices; The instrument pipes of the multiple monitoring devices are connected to the front cabinet, the air inlet and outlet of the instrument pipes are controlled by solenoid valves, and the main cabinet controls the solenoid valves to switch different pipelines to be measured, so as to monitor multiple pipelines to be measured.

7. The pipeline leakage monitoring system according to claim 1, characterized in that The main cabinet and the front cabinet of the pipeline leakage monitoring system are connected by a signal optical cable and a signal cable. The signal optical cable is used to transmit sensor data and control signals, and the signal cable is used to transmit the front cabinet fault signal.

8. The pipeline leakage monitoring system according to claim 1, characterized in that The main cabinet includes: An analysis module for analyzing and processing the sensor data obtained by the front cabinet; And / or; A display module for displaying the data processed by the analysis module; And / or; An alarm module for alarming when the data after the analysis module is abnormal; And / or; A switching module for switching between the remote mode and the local mode; And / or, A backup power supply for supplying power to the system in the main cabinet in the event of an external power outage.

9. A gas concentration monitoring method, characterized in that, The gas concentration monitoring method is implemented by the pipeline leakage monitoring system according to any one of claims 1-7. The gas concentration monitoring method includes: Controlling the gas flow; Detecting the gas concentration of the target component in the pipeline to be measured; Monitoring the pipeline to be measured according to the gas concentration.

10. A gas concentration monitoring device for a nuclear power plant, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the gas concentration monitoring method described in claim 9.

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