Wide-range airborne radioactive sampling monitoring system and method

Abstract

The invention relates to the technical field of radioactive gas sampling monitoring, and provides a wide-range airborne radioactive sampling monitoring system which comprises a sample introduction pipeline, a sample introduction pipeline, a first flushing pipeline, a first flushing bypass, a monitoring pipeline, a second flushing pipeline and a second flushing bypass, and the sample introduction pipeline is used for sample gas circulation. The flushing pipeline and the flushing bypass are arranged to respectively flush the sampling pipeline and the monitoring pipeline, so that a flushing object can be conveniently selected for flushing according to the actual flushing requirement, and the first flushing bypass and the sampling pipeline are mutually connected in parallel on the sampling pipeline; the second flushing pipeline is communicated between the sample inlet pipeline and the sample outlet pipeline, so that flushing gas cannot enter the sample outlet pipeline, and the flushing gas is prevented from interfering with conventional electrical control on the sample outlet pipeline due to the fact that the electrical regulation and control equipment is connected to the sample outlet pipeline during use and the flushing gas cannot enter the sample outlet pipeline. The use is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radioactive gas sampling monitoring, and particularly relates to a wide-range airborne radioactive sampling monitoring system and method. BACKGROUND

[0002] When the fuel elements of the reactor core of a nuclear power plant are in normal operation or are damaged, a small amount of radioactive fission products inevitably penetrates from the cracks of the fuel elements into the primary coolant, and when the primary circuit leaks, these radioactive fission products enter the air through relevant channels to form radioactive gaseous distribution (radioactive aerosol, iodine).

[0003] When radioactive gaseous distribution is formed in a sealed containment, and the reactor containment is shut down, relevant professionals need to enter the containment for necessary maintenance and inspection work, therefore, sampling and monitoring the radioactivity in the air in the containment is an important measure to protect relevant personnel, maintain the safety of the nuclear power plant, and ensure the normal operation of the nuclear power plant, which requires the provision of radioactive aerosol and iodine sampling equipment to deal with various containment radioactive leakage events that may occur in the event of an accident.

[0004] The invention with the publication number CN106297931B proposes a radioactive aerosol high-efficiency purification and recovery device and its working method, which includes a gas inlet, a radioactive aerosol filtration unit, an adjusting valve, a vacuum protection valve, a gas suction pump, a bubble unit, a tail gas radioactive aerosol detection unit and a gas outlet connected in sequence, and differential pressure gauges are connected in parallel at both ends of the radioactive aerosol filtration unit; the radioactive aerosol filtration unit includes two parallel and redundant radioactive aerosol filters, a first gamma dose rate radiation detector is arranged outside the radioactive aerosol filter, and each radioactive aerosol filter is provided with a stop valve at both ends. However, the above-mentioned aerosol high-efficiency purification and recovery device is not convenient for radioactive gas sampling monitoring, and it is not convenient to flush the sampling and monitoring system, which causes radioactive gas to possibly remain in the sampling and monitoring pipeline in the actual use process, and thus the accuracy of the data obtained by sampling and monitoring is not high, therefore, the present application proposes a wide-range airborne radioactive sampling monitoring system and method to solve the above-mentioned problems. SUMMARY

[0005] Therefore, the present application proposes a wide-range airborne radioactive sampling monitoring system and method to solve the technical problem that the existing sampling and monitoring system is not convenient for flushing the sampling and monitoring system, which causes radioactive gas to possibly remain in the sampling and monitoring pipeline in the actual use process, and thus the accuracy of the data obtained by sampling and monitoring is not high.

[0006] The technical scheme of the present application is implemented as follows: the present application provides a wide-range air-borne radioactive sampling monitoring system, comprising a sample inlet pipeline, a sample passing pipeline, a first flushing pipeline, a first flushing bypass, a monitoring pipeline, a second flushing pipeline and a second flushing bypass, wherein, The sample inlet pipeline is used for passing sample gas, and the sample passing pipeline is connected with the sample inlet pipeline, the sample passing pipeline comprises a sampling pipeline and a sample outlet pipeline, the sampling pipeline is used for passing sample gas and sampling, the sample outlet pipeline is connected with the outlet of the sampling pipeline and is used for discharging sample gas passing through the sampling pipeline, and the outlet of the sample outlet pipeline is selectively connected with the monitoring pipeline, and the monitoring pipeline is used for monitoring the radiation signal of the gas; The first flushing pipeline and the first flushing bypass are both connected with the sample inlet pipeline, and the first flushing bypass is connected with the first flushing pipeline in the passing direction of the sample inlet pipeline, and the first flushing pipeline is used for passing flushing gas; The second flushing pipeline is connected with the monitoring pipeline, and the first flushing bypass is connected with the second flushing pipeline; The second flushing bypass is connected between the sampling pipeline and the sample outlet pipeline and is used for discharging flushing gas passing through the sampling pipeline.

[0007] On the basis of the above technical scheme, preferably, a plurality of sampling devices are arranged on the sampling pipeline in parallel with each other, wherein, The sampling device comprises one aerosol filtering sampler and four iodine filtering samplers, the aerosol filtering sampler and the iodine filtering samplers are sequentially arranged in the gas passing direction of the sampling device, the front two iodine filtering samplers are used for adsorbing inorganic iodine, and the rear two iodine filtering samplers are used for adsorbing organic iodine.

[0008] On the basis of the above technical scheme, preferably, a first flow meter and a first adjusting valve are sequentially arranged on the sample outlet pipeline, wherein, The first flow meter is used for measuring the flow of gas passing through the sample outlet pipeline, the sample outlet pipeline connected with the first flow meter at both ends is provided with a stop valve, and the first flow meter is arranged between the outlet of the first flow meter and the stop valve, so as to control the flow of sample gas flowing out of the first flow meter, and the sample outlet pipeline is further provided with a first sampling port, and the first sampling port is connected with the outlet of the first flow meter.

[0009] On the basis of the above technical scheme, preferably, the system further comprises a first on-site processing display unit, a first electrical junction box and an electrical control box, wherein, A first electrical junction box is electrically connected with the first flow meter, and the first in-situ processing display unit and the electrical control box are both electrically connected with the first electrical junction box, the first electrical junction box is used for receiving the flow signal monitored by the first flow meter and transmitting to the first in-situ processing display unit, the first in-situ processing display unit is used for receiving and processing the flow signal monitored by the first flow meter and the analog signal of the radiation detector, and the electrical control box is controlled through the first electrical junction box, the electrical control box is used for regulating and controlling the control sample gas discharged from the sample outlet pipeline to enter the PING monitor or the monitoring pipeline.

[0010] On the basis of the above technical scheme, preferably, the monitoring pipeline is sequentially provided with a pressure gauge, a high-range inert gas detector and a second flow meter, wherein, the pressure gauge is used for monitoring the pressure of the gas flowing through the monitoring pipeline, the high-range inert gas detector is used for measuring the radiation signal of the gas flowing through the monitoring pipeline, and the second flow meter is used for monitoring the flow of the gas flowing through the monitoring pipeline, and the second flushing bypass is connected with the outlet end of the second flow meter.

[0011] On the basis of the above technical scheme, preferably, further comprising a second in-situ processing display unit and a second electrical junction box, wherein, the second electrical junction box is connected with the pressure gauge, the second flow meter and the second in-situ processing display unit, and is used for receiving the monitoring signals of the pressure gauge and the second flow meter and transmitting to the second in-situ processing display unit; the second in-situ processing display unit is connected with the high-range inert gas detector, and is used for receiving and processing the monitoring signals and the measurement signals of the high-range inert gas detector, and transmitting to an external monitoring system through the second electrical junction box.

[0012] On the basis of the above technical scheme, preferably, further comprising a first dust filter, a second dust filter and a parallel pipeline, wherein, the first dust filter is arranged on the first flushing pipeline and is used for filtering the dust in the gas flowing through the first flushing pipeline; the second dust filter is arranged at the inlet end of the monitoring pipeline and is used for filtering the dust in the gas flowing into the monitoring pipeline, and the inlet end and the outlet end of the second dust filter are both provided with a stop valve; the parallel pipeline is connected with the inlet end and the outlet end of the second dust filter at two ends, and the parallel pipeline is provided with a stop valve.

[0013] On the basis of the above technical scheme, preferably, further comprising a control pipeline, wherein, The control pipeline comprises a VM1 control pipeline, a VM2 control pipeline and a VM3 control pipeline, the VM2 control pipeline and the VM3 control pipeline are both communicated with the VM1 control pipeline, the VM2 control pipeline is used for supplying sample gas into the PING monitor, and the VM3 control pipeline is used for supplying sample gas into the monitoring pipeline. The first control line and the second control line are communicated between the first electrical wiring box and the electrical control box, the VM1 control line, the VM2 control line and the VM3 control line are connected on the electrical control box, the first control line and the second control line are both used for controlling the on-off of the VM1 control line, the VM2 control line and the VM3 control line, and the VM1 control line, the VM2 control line and the VM3 control line are respectively used for regulating the on-off of the VM1 control pipeline, the VM2 control pipeline and the VM3 control pipeline. When the first control line is disconnected and the second control line is disconnected, the VM1 control line and the VM2 control line are communicated, and the VM3 control line is disconnected, when the first control line is disconnected and the second control line is closed, the VM1 control line and the VM3 control line are communicated, and the VM2 control line is disconnected, and when the first control line is closed and the second control line is closed, the VM1 control line is disconnected.

[0014] On the basis of the above technical scheme, preferably, the inlet end of the second flowmeter is communicated with an inlet straight pipe section, the outlet end of the second flowmeter is communicated with an outlet straight pipe section, the length of the inlet straight pipe section is L1, the length of the outlet straight pipe section is L2, the pipe diameter of the inlet straight pipe section and the outlet straight pipe section is R, L1 is greater than or equal to 10R, and L2 is greater than or equal to 5R.

[0015] The application further provides a wide-range air-borne radioactive sampling and monitoring method, and the wide-range air-borne radioactive sampling and monitoring system is used in the method. S1, when it is needed to flush the sampling pipeline, flushing gas is supplied from the first flushing pipeline, and the first flushing bypass and the sample outlet pipeline are disconnected, at this time, the flushing gas flows into the sampling pipeline, the flushing process of the sampling pipeline is completed, and the flushing gas is discharged from the second flushing pipeline; S2, when it is needed to flush the monitoring pipeline, flushing gas is supplied from the first flushing pipeline, and the sampling pipeline is disconnected, at this time, the flushing gas flows into the monitoring pipeline through the first flushing bypass and the second flushing bypass, the flushing process of the monitoring pipeline is completed, and the flushing gas is discharged from the outlet end of the monitoring pipeline.

[0016] The wide-range air-borne radioactive sampling and monitoring system and method have the following beneficial effects relative to the prior art. (1) By setting the flushing pipeline and flushing bypass respectively to flush the sampling pipeline and monitoring pipeline, it is convenient to select the flushing object for flushing according to the actual flushing demand, by setting the first flushing bypass and the sampling pipeline parallel to each other on the sample inlet pipeline, and by setting the second flushing pipeline connected between the sample inlet pipeline and the sample outlet pipeline, so that the flushing gas cannot enter the sample outlet pipeline, since the electrical control equipment is connected on the sample outlet pipeline during use, by setting the flushing gas cannot enter the sample outlet pipeline, preventing the flushing gas from interfering with the conventional electrical control on the sample outlet pipeline, facilitating use; (2) By setting the electrical control box to control the gas discharged from the sample outlet pipeline, and selectively supply the PING monitor or the accident range gas-borne radioactive monitoring pipeline, so that when the gas activity concentration monitored by the first flow meter is greater than 1.17*10 8 Bq / m 3 , the electrical control box controls the sample outlet pipeline and the monitoring pipeline to be connected, that is, the normal range is switched to the accident range, and the radiation signal of the gas is continuously monitored through the monitoring pipeline, when the gas activity concentration monitored by the first flow meter is less than 3.94*10 7 Bq / m 3 , the electrical control box controls the sample outlet pipeline and the PING monitor to be connected, that is, the accident range is switched to the normal range, and the sampling and measurement of the sample gas are normally carried out, and the radiation signal of the gas is continuously monitored through the PING monitor, so that the workers can carry out maintenance and inspection work under normal range, and the use safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Fig. 1 It is a system schematic diagram of the sampling pipeline of the wide-range gas-borne radioactive sampling monitoring system of the present application; Fig. 2 It is a system schematic diagram of the monitoring pipeline of the wide-range gas-borne radioactive sampling monitoring system of the present application; Fig. 3 It is a control system schematic diagram of the electrical control box of the wide-range gas-borne radioactive sampling monitoring system of the present application.

[0019] In the diagram: 1. Sample inlet line; 2. Sample outlet line; 21. Sampling line; 22. Sample outlet line; 31. Sampling device; 32. First flow meter; 33. First regulating valve; 34. First sampling port; 35. Second flushing line; 41. First flushing line; 42. First flushing bypass; 43. Second regulating valve; 44. First dust filter; 51. First on-site treatment display unit; 52. First electrical junction box; 521. First control circuit; 522. Second control circuit; 53. Electrical control... Box; 531, VM1 control circuit; 532, VM2 control circuit; 533, VM3 control circuit; 61, monitoring pipeline; 62, second flushing bypass; 71, pressure gauge; 72, high-range inert gas detector; 73, second flow meter; 74, second dust filter; 75, parallel pipeline; 81, second local processing display unit; 82, second electrical junction box; 9, control pipeline; 91, VM1 control pipeline; 92, VM2 control pipeline; 93, VM3 control pipeline. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figs. 1-3 As shown, the wide-range gaseous radioactive sampling and monitoring system of the present invention is characterized by comprising: an inlet pipe 1, a through pipe 2, a first flushing pipe 41, a first flushing bypass 42, a monitoring pipe 61, a second flushing pipe 62, and a second flushing bypass 35. The inlet pipe 1 is used to supply sample gas flow, and the through pipe 2 is connected to the inlet pipe 1. The through pipe 2 includes a sampling pipe 21 and an outlet pipe 22. The sampling pipe 21 is used to supply sample gas flow and sample, and the outlet pipe 22 is connected to the outlet of the sampling pipe 21 to discharge the sample gas flowing through the sampling pipe 21. The outlet of sample 2 is selectively connected to monitoring line 61, which is used to monitor the radiation signal of the gas; the first flushing line 41 and the first flushing bypass 42 are both connected to sample inlet line 1, and the first flushing bypass 42 is connected to the first flushing line 41 in the flow direction of sample inlet line 1. The first flushing line 41 is used to supply flushing gas; the second flushing line 62 is connected to monitoring line 61, and the first flushing bypass 42 is connected to the second flushing line 62; the second flushing bypass 35 is connected between sampling line 21 and sample outlet line 22, and is used to discharge the flushing gas flowing through sampling line 21.

[0022] In a specific implementation, when flushing of the sampling pipeline 21 is required, the flushing gas is supplied from the first flushing pipeline 41, and the first flushing bypass 42 and the sample outlet pipeline 22 are disconnected, at this time, the flushing gas flows into the sampling pipeline 21, and the flushing process of the sampling pipeline 21 is completed, and is discharged from the second flushing pipeline 35. When flushing of the monitoring pipeline 61 is required, the flushing gas is supplied from the first flushing pipeline 41, and the sampling pipeline 21 is disconnected, at this time, the flushing gas flows into the monitoring pipeline 61 through the first flushing bypass 42 and the second flushing bypass 62, and the flushing process of the monitoring pipeline 61 is completed, and is discharged from the outlet end of the monitoring pipeline 61.

[0023] By setting the flushing pipeline and the flushing bypass to flush the sampling pipeline 21 and the monitoring pipeline 61 respectively, it is convenient to select the flushing object for flushing according to the actual flushing requirement. By setting the first flushing bypass 42 and the sampling pipeline 21 to be parallel to each other on the sample inlet pipeline 1, and by setting the second flushing pipeline 35 to be communicated between the sample inlet pipeline 21 and the sample outlet pipeline 22, the flushing gas cannot enter the sample outlet pipeline 22. Since the electrical control equipment is connected to the sample outlet pipeline 22 during use, by setting the flushing gas to be unable to enter the sample outlet pipeline 22, the flushing gas is prevented from interfering with the normal electrical control on the sample outlet pipeline 22, and use is facilitated.

[0024] In a specific implementation, the second adjusting valve 43 is arranged on the first flushing bypass 42, and is used to adjust the flow of the flushing gas flowing through the first flushing bypass 42.

[0025] As a preferred implementation, the sampling pipeline 21 is provided with a plurality of sampling devices 31 which are parallel to each other, wherein the sampling device 31 includes one aerosol filter sampler and four iodine filter samplers, and the aerosol filter sampler and the iodine filter samplers are sequentially arranged in the gas flow direction of the sampling device 31. The front two iodine filter samplers are used to adsorb inorganic iodine, and the rear two iodine filter samplers are used to adsorb organic iodine.

[0026] In a specific implementation, the aerosol filter sampler is a large-area aerosol filter paper aerosol sampler, and the iodine filter sampler is an activated carbon filter box. The outside of the sampling device 31 is shielded by a 2cm lead layer to shield the radioactivity in the sampled sample.

[0027] In a specific implementation, the iodine filter shell is made of a conductive Teflon material, and the aerosol filter shell is made of a stainless steel material. The filter material is embedded between the support grids in the cylindrical shell, and the iodine filter material has an additional layer of fabric mesh. The five filters are sequentially stacked between two stainless steel discs and are fixed by four studs.

[0028] In a specific implementation, the aerosol filter sampler uses glass fiber filter paper as the aerosol sampling medium.

[0029] Preferably, the number of sampling devices 31 is two, and the sampling devices are connected in series to form a sampling gas channel, and the medium gas passes through the aerosol filter sampler and the iodine filter sampler from top to bottom, and then returns to the outlet pipeline 22 from bottom to top.

[0030] As a preferred embodiment, the outlet pipeline 22 is sequentially provided with a first flow meter 32 and a first regulating valve 33, wherein the first flow meter 32 is used to measure the flow rate of the gas flowing out of the outlet pipeline 22, the outlet pipeline 22 connected to both ends of the first flow meter 32 is provided with a stop valve, and the first flow meter 32 is arranged between the outlet of the first flow meter 32 and the stop valve to regulate the flow rate of the sample gas flowing out of the first flow meter 32. The outlet pipeline 22 is further provided with a first sampling port 34, and the first sampling port 34 is connected to the outlet of the first flow meter 32.

[0031] In a specific implementation, the number of first sampling ports 34 is two, and the two first sampling ports 34 are connected to one end of the stop valve close to the first regulating valve 33 and one end of the stop valve away from the first regulating valve 33, respectively.

[0032] As a preferred embodiment, it further includes a first on-site processing display unit 51, a first electrical junction box 52 and an electrical control box 53, wherein the first electrical junction box 52 is electrically connected to the first flow meter 32, and the first on-site processing display unit 51 and the electrical control box 53 are both electrically connected to the first electrical junction box 52. The first electrical junction box 52 is used to receive the flow signal monitored by the first flow meter 32 and transmit it to the first on-site processing display unit 51. The first on-site processing display unit 51 is used to receive and process the flow signal monitored by the first flow meter 32 and the analog signal of the radiation detector, and control the electrical control box 53 through the first electrical junction box 52. The electrical control box 53 is used to regulate the control sample gas discharged from the outlet pipeline 22 to enter the PING monitor or the monitoring pipeline 61.

[0033] By setting the electrical control box 53 to control the gas discharged from the outlet pipeline 22 and selectively supply the PING monitor or the monitoring pipeline 61, when the gas activity concentration monitored by the first flow meter 32 is greater than 1.17×10 8 Bq / m 3 , the electrical control box 53 regulates the outlet pipeline 22 to be connected to the monitoring pipeline 61, i.e. switches the normal range to the accident range, and continuously monitors the radiation signal of the gas through the monitoring pipeline 61. When the gas activity concentration monitored by the high-range inert gas detector 72 is less than 3.94×10 7 Bq / m 3When the electrical control box 53 controls the sample pipeline 22 to be connected with the PING monitor, that is, the accident range is switched to the normal range, the sample gas is measured normally, and the radiation signal of the gas is continuously monitored by the PING monitor, so that the staff can perform maintenance and inspection work in the normal range, and the use safety is improved.

[0034] In specific implementation, the threshold value for switching the normal range to the accident range is 1.17*10 8 Bq / m 3 The corresponding current is 18.4 mA, and the threshold value for switching the accident range to the normal range is 3.94*10 7 Bq / m 3 The corresponding current is 5.6 mA. That is, whether it is the normal range or the accident range can be judged and processed by monitoring the current output.

[0035] In specific implementation, the control pipeline 9 is further included, wherein the control pipeline 9 includes a VM1 control pipeline 91, a VM2 control pipeline 92 and a VM3 control pipeline 93, the VM2 control pipeline 92 and the VM3 control pipeline 93 are both connected with the VM1 control pipeline 91, the VM2 control pipeline 92 is used for supplying the sample gas into the PING monitor, and the VM3 control pipeline 93 is used for supplying the sample gas into the monitoring pipeline 61; the first electrical junction box 52 is connected with the first control line 521 and the second control line 522, the electrical control box 53 is connected with a VM1 control line 531, a VM2 control line 532 and a VM3 control line 533, the first control line 521 and the second control line 522 are both used for controlling the on-off of the VM1 control line 531, the VM2 control line 532 and the VM3 control line 533, and the VM1 control line 531, the VM2 control line 532 and the VM3 control line 533 are respectively used for controlling the on-off of the VM1 control pipeline 91, the VM2 control pipeline 92 and the VM3 control pipeline 93; when the first control line 521 is disconnected and the second control line 522 is disconnected, the VM1 control line 531 and the VM2 control line 532 are connected, and the VM3 control line 533 is disconnected; when the first control line 521 is disconnected and the second control line 522 is closed, the VM1 control line 531 and the VM3 control line 533 are connected, and the VM2 control line 532 is disconnected; and when the first control line 521 is closed and the second control line 522 is closed, the VM1 control line 531 is disconnected.

[0036] Through the above control relationship, the on-off control of the VM1 control pipeline 91, the VM2 control pipeline 92 and the VM3 control pipeline 93 can be completed through the first control line 521 and the second control line 522, and the use is facilitated.

[0037] As a preferred embodiment, the monitoring pipeline 61 is sequentially provided with a pressure gauge 71, a high-range inert gas detector 72 and a second flow meter 73, wherein the pressure gauge 71 is used to monitor the gas pressure flowing through the monitoring pipeline 61, the high-range inert gas detector 72 is used to measure the radiation signal of the gas flowing through the monitoring pipeline 61, and the second flow meter 73 is used to monitor the gas flow through the monitoring pipeline 61. The second flushing bypass 35 is connected to the outlet end of the second flow meter 73.

[0038] In a specific implementation, a 5cm lead shielding is externally used on the high-range inert gas detector 72 to effectively isolate the interference from the external environment.

[0039] The second in-situ processing display unit 81 and the second electrical junction box 82 are further included, wherein the second electrical junction box 82 is connected to the pressure gauge 71, the second flow meter 73 and the second in-situ processing display unit 81, used to receive the monitoring signals of the pressure gauge 71 and the second flow meter 73 and transmit them to the second in-situ processing display unit 81; the second in-situ processing display unit 81 is connected to the high-range inert gas detector 72, used to receive the processing monitoring signals and the measurement signals of the high-range inert gas detector 72, and transmit them to the external monitoring system through the second electrical junction box 82.

[0040] In this way, the external monitoring system can monitor the radiation signal of the gas and the measurement signal of the gas state sensor in real time, so that the user can determine whether the gas has returned to the normal range, and the user can accurately perform maintenance and inspection work in the normal range, thereby improving safety.

[0041] As a preferred embodiment, the first dust filter 44, the second dust filter 74 and the parallel pipeline 75 are further included, wherein the first dust filter 44 is arranged on the first flushing pipeline 41 and used to filter the dust in the gas flowing through the first flushing pipeline 41; the second dust filter 74 is arranged at the inlet end of the monitoring pipeline 61 and used to filter the dust in the gas flowing into the monitoring pipeline 61, the inlet end and the outlet end of the second dust filter 74 are both provided with a stop valve; and the two ends of the parallel pipeline 75 are respectively connected to the inlet end and the outlet end of the second dust filter 74, and the parallel pipeline 75 is provided with a stop valve.

[0042] In this way, the flushing gas and the gas supplied to the monitoring pipeline 61 can be filtered, thereby improving the flushing cleanliness and the monitoring accuracy of the high-range inert gas detector 72. By connecting the parallel pipeline 75 to the second dust filter 74 in parallel, the gas supply processing of the high-range inert gas detector 72 can be normally performed when the second dust filter 74 is cleaned, thereby facilitating use.

[0043] As a preferred implementation, an inlet straight pipe section is communicated at the inlet end of the second flow meter 73, an outlet straight pipe section is communicated at the outlet end of the second flow meter 73, the length of the inlet straight pipe section is L1, the length of the outlet straight pipe section is L2, the pipe diameter of the inlet straight pipe section and the outlet straight pipe section is R, L1 is greater than or equal to 10R, and L2 is greater than or equal to 5R.

[0044] In a specific implementation, the first flow meter 32 also adopts the above-mentioned arrangement.

[0045] In this way, the inlet end and the outlet end of the flow meter are both reserved with sufficient straight pipe sections to ensure the measurement accuracy of the flow meter.

[0046] The application further provides a wide-range airborne radioactive sampling and monitoring method, which comprises the wide-range airborne radioactive sampling and monitoring system and further comprises the following steps. Step one: when the sampling pipeline 21 needs to be flushed, the flushing gas is supplied from the first flushing pipeline 41, the first flushing bypass 42 and the sample outlet pipeline 22 are disconnected, the flushing gas flows into the sampling pipeline 21 at this time, the flushing process of the sampling pipeline 21 is completed, and the flushing gas is discharged from the second flushing pipeline 35; Step two: when the monitoring pipeline 61 needs to be flushed, the flushing gas is supplied from the first flushing pipeline 41, the sampling pipeline 21 is disconnected at this time, the flushing gas flows into the monitoring pipeline 61 through the first flushing bypass 42 and the second flushing bypass 62, the flushing process of the monitoring pipeline 61 is completed, and the flushing gas is discharged from the outlet end of the monitoring pipeline 61; Step three: when the activity concentration of the gas monitored by the high-range inert gas detector 72 is greater than 1.17*10 8 Bq / m 3 , the electrical control box 53 controls the sample outlet pipeline 22 to be communicated with the monitoring pipeline 61, the radiation signal of the gas and the measurement signal of the gas state sensor are monitored in real time through the monitoring pipeline 61 to help determine whether the gas returns to the safe range; Step four: when the activity concentration of the gas monitored by the high-range inert gas detector 72 is less than 3.94*10 7 Bq / m 3 , the electrical control box 53 controls the sampling pipeline 21 to be communicated with the PING monitor, i.e., the accident range is switched to the normal range. Fig. 3

[0047] It should be noted that the above-mentioned pipelines are all provided with stop valves for controlling the opening and closing.

[0048] Preferably, two second sampling ports are also arranged at the outlet end of the monitoring pipeline 61.

[0049] ​The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wide-range airborne radioactivity sampling and monitoring system, characterized in that: It includes a sample inlet line (1), a sample outlet line (2), a first flushing line (41), a first flushing bypass line (42), a monitoring line (61), a second flushing line (62), and a second flushing bypass line (35), wherein, The inlet pipe (1) is used to supply sample gas flow, and the outlet pipe (2) is connected to the inlet pipe (1). The outlet pipe (2) includes a sampling pipe (21) and an outlet pipe (22). The sampling pipe (21) is used to supply sample gas flow and sample. The outlet pipe (22) is connected to the outlet of the sampling pipe (21) and is used to discharge the sample gas flowing through the sampling pipe (21). The outlet of the outlet pipe (22) is selectively connected to the monitoring pipe (61). The monitoring pipe (61) is used to monitor the radiation signal of the gas. The first flushing line (41) and the first flushing bypass (42) are both connected to the sample inlet line (1), and the first flushing bypass (42) is connected to the first flushing line (41) in the flow direction of the sample inlet line (1). The first flushing line (41) is used to supply flushing gas. The second flushing pipeline (62) is connected to the monitoring pipeline (61), and the first flushing bypass (42) is connected to the second flushing pipeline (62); The second flushing bypass (35) is connected between the sampling line (21) and the sample outlet line (22) and is used to discharge the flushing gas flowing through the sampling line (21).

2. The wide-range airborne radioactive sampling and monitoring system as described in claim 1, characterized in that: The sampling pipeline (21) is equipped with multiple sampling devices (31) connected in parallel, wherein, The sampling device (31) includes an aerosol filter sampler and four iodine filter samplers. The aerosol filter sampler and the iodine filter samplers are distributed sequentially in the gas flow direction of the sampling device (31). The two iodine filter samplers at the front end are used to adsorb inorganic iodine, and the two iodine filter samplers at the rear end are used to adsorb organic iodine.

3. The wide-range airborne radioactive sampling and monitoring system as described in claim 1, characterized in that: The sample outlet pipeline (22) is sequentially equipped with a first flow meter (32) and a first regulating valve (33), wherein, The first flow meter (32) is used to measure the gas flow rate through the sample outlet pipe (22). The sample outlet pipe (22) connected to both ends of the first flow meter (32) is equipped with a shut-off valve. The first flow meter (32) is located between the outlet of the first flow meter (32) and the shut-off valve to regulate the flow rate of the sample gas flowing out from the first flow meter (32). The sample outlet pipe (22) is also equipped with a first sampling port (34), which is connected to the outlet of the first flow meter (32).

4. The wide-range airborne radioactive sampling and monitoring system as described in claim 3, characterized in that: It also includes a first local processing display unit (51), a first electrical junction box (52), and an electrical control box (53), wherein, The first electrical junction box (52) is electrically connected to the first flow meter (32), and the first local processing display unit (51) and the electrical control box (53) are both electrically connected to the first electrical junction box (52). The first electrical junction box (52) is used to receive the flow signal monitored by the first flow meter (32) and transmit it to the first local processing display unit (51). The first local processing display unit (51) is used to receive and process the flow signal monitored by the first flow meter (32) and the analog signal of the radiation detector, and control the electrical control box (53) through the first electrical junction box (52). The electrical control box (53) is used to regulate the sample gas discharged from the sample outlet pipe (22) to enter the PING monitor or the monitoring pipe (61).

5. The wide-range airborne radioactive sampling and monitoring system as described in claim 1, characterized in that: The monitoring pipeline (61) is sequentially equipped with a pressure gauge (71), a high-range inert gas detector (72), and a second flow meter (73), wherein, The pressure gauge (71) is used to monitor the gas pressure flowing through the monitoring pipeline (61), the high-range inert gas detector (72) is used to measure the radiation signal of the gas flowing through the monitoring pipeline (61), the second flow meter (73) is used to monitor the gas flow rate flowing through the monitoring pipeline (61), and the second flushing bypass (35) is connected to the outlet end of the second flow meter (73).

6. The wide-range airborne radioactive sampling and monitoring system as described in claim 5, characterized in that: It also includes a second local processing display unit (81) and a second electrical junction box (82), wherein, The second electrical junction box (82) is connected to the pressure gauge (71), the second flow meter (73) and the second local processing display unit (81), and is used to receive the monitoring signals of the pressure gauge (71) and the second flow meter (73) and transmit them to the second local processing display unit (81). The second local processing and display unit (81) is connected to the high-range inert gas detector (72) and is used to receive and process monitoring signals and measurement signals from the high-range inert gas detector (72), and transmit them to the external monitoring system through the second electrical junction box (82).

7. The wide-range airborne radioactive sampling and monitoring system as described in claim 5, characterized in that: It also includes a first dust filter (44), a second dust filter (74), and parallel piping (75), wherein, The first dust filter (44) is installed on the first flushing pipe (41) and is used to filter dust in the gas flowing through the first flushing pipe (41); The second dust filter (74) is installed at the inlet end of the monitoring pipeline (61) to filter dust in the gas flowing into the monitoring pipeline (61). Both the inlet and outlet ends of the second dust filter (74) are equipped with shut-off valves. The two ends of the parallel pipeline (75) are respectively connected to the inlet and outlet of the second dust filter (74), and a shut-off valve is provided on the parallel pipeline (75).

8. The wide-range airborne radioactive sampling and monitoring system as described in claim 4, characterized in that: It also includes control piping (9), in which, The control line (9) includes a VM1 control line (91), a VM2 control line (92), and a VM3 control line (93). The VM2 control line (92) and the VM3 control line (93) are both connected to the VM1 control line (91). The VM2 control line (92) is used to supply sample gas into the PING monitor, and the VM3 control line (93) is used to supply sample gas into the monitoring line (61). The first electrical junction box (52) and the electrical control box (53) are connected by a first control line (521) and a second control line (522). The electrical control box (53) is connected to a VM1 control line (531), a VM2 control line (532) and a VM3 control line (533). The first control line (521) and the second control line (522) are used to control the on / off state of the VM1 control line (531), the VM2 control line (532) and the VM3 control line (533). The VM1 control line (531), the VM2 control line (532) and the VM3 control line (533) are respectively used to regulate the on / off state of the VM1 control pipeline (91), the VM2 control pipeline (92) and the VM3 control pipeline (93). When the first control line (521) is disconnected and the second control line (522) is disconnected, the VM1 control line (531) and the VM2 control line (532) are connected, and the VM3 control line (533) is disconnected. When the first control line (521) is disconnected and the second control line (522) is closed, the VM1 control line (531) and the VM3 control line (533) are connected, and the VM2 control line (532) is disconnected. When the first control line (521) is closed and the second control line (522) is closed, the VM1 control line (531) is disconnected.

9. The wide-range airborne radioactive sampling and monitoring system as described in claim 5, characterized in that: The inlet end of the second flow meter (73) is connected to an inlet straight pipe section, and the outlet end of the second flow meter (73) is connected to an outlet straight pipe section. The length of the inlet straight pipe section is L1, the length of the outlet straight pipe section is L2, and the pipe diameters of the inlet straight pipe section and the outlet straight pipe section are both R, L1≥10R, L2≥5R.

10. A wide-range airborne radioactivity sampling and monitoring method, characterized in that: The wide-range airborne radioactivity sampling and monitoring system as described in any one of claims 1 to 9 further includes the following steps: S1. When it is necessary to flush the sampling pipeline (21), the flushing gas is supplied from the first flushing pipeline (41), and the first flushing bypass (42) and the sample outlet pipeline (22) are disconnected. At this time, the flushing gas flows into the sampling pipeline (21) to complete the flushing treatment of the sampling pipeline (21) and is discharged from the second flushing pipeline (35). S2. When it is necessary to flush the monitoring pipeline (61), the flushing gas is supplied from the first flushing pipeline (41) and the sampling pipeline (21) is disconnected. At this time, the flushing gas flows into the monitoring pipeline (61) through the first flushing bypass (42) and the second flushing bypass (62), completing the flushing treatment of the monitoring pipeline (61) and being discharged from the outlet end of the monitoring pipeline (61).

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