CN215297689U - High humidity inert gas activity monitoring device - Google Patents
High humidity inert gas activity monitoring device Download PDFInfo
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- CN215297689U CN215297689U CN202121434556.3U CN202121434556U CN215297689U CN 215297689 U CN215297689 U CN 215297689U CN 202121434556 U CN202121434556 U CN 202121434556U CN 215297689 U CN215297689 U CN 215297689U
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Abstract
The utility model discloses a high humidity inert gas activity ratio monitoring devices, including the support, the support includes the mounting panel of bottom plate and vertical setting, is provided with first sample pump, second sample pump and lead shielding room on the bottom plate, is provided with inert gas sample room and inert gas detector in the lead shielding room, and the front of mounting panel is provided with electrical control box and radiation processing unit on the spot, and the back of mounting panel is provided with inert gas sample pipeline. The utility model discloses simple structure, reasonable in design, it is convenient to realize, can effectively use in high humidity inert gas activity ratio monitoring, realizes taking out the beta active monitoring of thing to the non-condensation that takes out from the condenser, and then judges steam generator's the leakage condition, the stable performance, efficient, excellent in use effect, convenient to popularize and use.
Description
Technical Field
The utility model belongs to the technical field of nuclear radiation monitoring, concretely relates to high humidity inert gas activity ratio monitoring devices.
Background
In order to protect the personnel and public places of the nuclear power plant from radioactive emissions, the nuclear power plant is provided with a radiation monitoring system (abbreviated as KRT system) for continuously monitoring the nuclear power plant area and airborne suspended matter, as well as the nuclear power plant process and the radioactivity of effluents.
A nuclear power plant of a pressurized water reactor nuclear power plant is generally composed of two closed circulation loops, called a primary loop and a secondary loop, the primary loop includes a nuclear reactor (sealed in a pressure vessel), a main coolant pump, a pressurizer and other devices, the secondary loop includes a steam generator, a condenser, a main coolant pump and other devices, and the primary loop is connected to the reactor core and the steam generator in the secondary loop. After absorbing the heat energy of the cooling water in the first loop, the cooling water in the second loop is heated to boiling (the temperature is about 260 ℃) to form steam, and the steam is filtered to remove mixed liquid water and then is sent to a steam turbine to push a turbine engine to operate to generate electricity. The cooling water of the two loops flowing out from the steam turbine is condensed into liquid water by the condenser and then flows back to the steam generator.
Inert gas activity monitor for monitoring inert gas in non-condensed extract extracted from condenser85Kr、133The total activity concentration of beta activity of Xe is used to determine the leak condition of the steam generator. Therefore, there is a need for a reasonably designed high humidity inert gas activity monitoring device.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, provide a high humidity inert gas activity ratio monitoring devices, its simple structure, reasonable in design, it is convenient to realize, can effectively use in high humidity inert gas activity ratio monitoring, realizes taking out the beta activity monitoring of thing to the noncondensation that takes out from the condenser, and then judges steam generator's the leakage condition, the stable performance, it is efficient, excellent in use effect, convenient to popularize and use.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a high humidity inert gas activity monitoring devices, includes the support, the support includes the mounting panel of bottom plate and vertical setting, be provided with first sample pump, second sample pump and lead shielding room on the bottom plate, be provided with inert gas sample room and inert gas detector in the lead shielding room, the front of mounting panel is provided with electrical control box and radiation treatment unit on the spot, the back of mounting panel is provided with inert gas sample pipeline.
The first sampling pump and the second sampling pump are mutually independent and redundant.
In the above device for monitoring the activity of the high-humidity inert gas, the inert gas sampling chamber is a sealed chamber with a volume of 3.47L.
In the high-humidity inert gas activity monitoring device, the inert gas detector is arranged at the upper part of the inert gas sampling chamber.
Foretell high humidity inert gas activity monitoring devices, the inert gas detector includes plastic scintillator, organic glass light guide and the photomultiplier that from bottom to top set gradually, photomultiplier's output is connected with signal processing circuit module, signal processing circuit module is connected with the input of radiation processing unit on the spot.
The inert gas sampling pipeline comprises a sampling gas inlet interface, a purging gas inlet interface and a gas return interface which are all arranged at the upper part of the mounting plate, and a detection gas inlet chamber interface, a detection gas return chamber interface, a first sampling pump gas inlet interface, a first sampling pump gas return interface, a second sampling pump gas inlet interface and a second sampling pump gas return interface which are all arranged at the lower part of the mounting plate; the detection air inlet cavity interface and the detection air return cavity interface are connected with the inert gas sampling chamber through hoses, the first sampling pump air inlet interface and the first sampling pump air return interface are connected with the first sampling pump through hoses, and the second sampling pump air inlet interface and the second sampling pump air return interface are connected with the second sampling pump through hoses.
In the high-humidity inert gas activity monitoring device, the sampling gas inlet interface is connected with a steam-water separation device for dehumidifying high-humidity inert gas.
Above-mentioned high humidity inert gas activity monitoring devices, aerosol and iodine filtering component, flow control valve and flowmeter have set gradually along with the air current direction on the inert gas sampling pipeline.
Foretell high humidity inert gas activity monitoring devices, aerosol and iodine filtering component include first aerosol and iodine filtering line and second aerosol and iodine filtering line, first aerosol and iodine filtering line include first valve, first aerosol and iodine filter and the second valve that sets gradually along with the direction of admitting air, second aerosol and iodine filter and fourth valve that second aerosol and iodine filtering line include the third valve, second aerosol and iodine filter and the fourth valve that set gradually along with the direction of admitting air, first aerosol and iodine filtering line are the same with second aerosol and iodine filtering line structure and are each other redundant.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses simple structure, reasonable in design, it is convenient to realize.
2. The utility model relates to a first sample pump and second sample pump, mutual independence each other is redundant, improves job stabilization nature.
3. The utility model relates to an aerosol and iodine filtering component, aerosol and iodine filter paper that inert gas passes through in aerosol and the iodine filtering mechanism filter aerosol and particle thing, adopt the radioactive iodine among the active carbon box adsorption inert gas again to aerosol and gaseous state radioactive iodine get into inert gas sampling chamber, influence the detection result.
4. The utility model discloses a first aerosol and iodine that aerosol and iodine filtering component project organization are the same filters pipeline and second aerosol and iodine filtering pipeline, and two way each other are redundant, and the part work all the way, another way is closed completely, and this all the way in closing can change filter paper, iodine box to guarantee incessant function, raise the efficiency.
5. The utility model discloses all set up inert gas sampling room and inert gas detector in lead shielding chamber, can reduce outside gamma ray and influence, reduce the background count, improve low radioactivity detection ability.
6. The utility model discloses can effectively use in the monitoring of high humidity inert gas activity ratio, realize taking out the beta active monitoring of thing to the non-condensation that takes out from the condenser, and then judge steam generator's the leakage condition, the stable performance, efficient, excellent in use effect, convenient to popularize and use.
To sum up, the utility model discloses simple structure, reasonable in design realizes conveniently, can effectively use in high humidity inert gas activity ratio monitoring, realizes taking out the beta active monitoring of thing to the non-condensation that takes out from the condenser, and then judges steam generator's the leakage condition, the stable performance, efficient, excellent in use effect, convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of an inert gas sampling chamber and an inert gas detector according to the present invention;
FIG. 3 is a schematic block diagram of the inert gas detector of the present invention;
fig. 4 is a schematic structural diagram of the inert gas sampling pipeline of the present invention.
Description of reference numerals:
1-a bottom plate; 2-mounting a plate; 3-a first sampling pump;
4-a second sampling pump; 5-lead shielding chamber; 6-inert gas sampling chamber;
7-inert gas detector; 7-1-plastic scintillator; 7-2-plexiglas lightguide;
7-3-photomultiplier tube; 7-4-a signal processing circuit module; 8-an electrical control box;
9-an in situ radiation treatment unit; 11-a sampling gas inlet interface; 12-a purge gas inlet interface;
13-a gas return interface; 14-probing the air intake chamber interface; 15-detecting the return air chamber interface;
16-a first sample pump air inlet interface; 17-first sampling pump return air interface;
18-a second sample pump air inlet interface; 19-a second sampling pump return air interface;
20-flow regulating valve; 21-a flow meter; 22-a first valve;
23-a first aerosol and iodine filter; 24-a second valve; 25-a third valve;
26-a second aerosol and iodine filter; 27-fourth valve.
Detailed Description
As shown in fig. 1, the utility model discloses a high humidity inert gas activity monitoring devices, which comprises a bracket, the support includes mounting panel 2 of bottom plate 1 and vertical setting, be provided with first sample pump 3, second sample pump 4 and lead shielding room 5 on the bottom plate 1, be provided with inert gas sample room 6 and inert gas detector 7 in the lead shielding room 5, mounting panel 2's front is provided with electrical control box 8 and radiation treatment unit 9 on the spot, mounting panel 2's the back is provided with inert gas sample pipeline.
During specific implementation, the on-site radiation processing unit 9 is connected with and communicates with the inert gas detector 7 through the RS485 interface, data processing of activity concentration of inert gas is completed, display is performed through the display module, when the activity concentration exceeds an alarm threshold value, an audible and visual alarm signal is sent through the audible and visual alarm module, and the alarm signal is transmitted to the main control room through the Ethernet interface or the RS485 communication interface. The electrical control box 8 provides power for the first sampling pump 3, the second sampling pump 4 and the local radiation processing unit 9, and provides an input wiring terminal and an output wiring terminal, wherein the input wiring terminal comprises 4-20 mA analog input (external flow signal and temperature), the output wiring terminal comprises 4-20 mA output (measurement result) and switch output (fault/failure, test/source detection, high-value alarm and high-value alarm), and RS485 communication (measurement result and control).
During specific implementation, the inert gas sampling chamber 6 and the inert gas detector 7 are both arranged in the lead shielding chamber 5, so that the influence of external gamma rays can be reduced, background counting is reduced, and the low-radioactivity detection capability is improved.
In this embodiment, the first sampling pump 3 and the second sampling pump 4 are independent of each other and redundant to each other.
In this embodiment, the inert gas sampling chamber 6 is a sealed chamber having a volume of 3.47L.
In this embodiment, as shown in fig. 2, the inert gas detector 7 is disposed at an upper portion of the inert gas sampling chamber 6.
In this embodiment, as shown in fig. 3, the inert gas detector 7 includes a plastic scintillator 7-1, an organic glass light guide 7-2, and a photomultiplier 7-3, which are sequentially disposed from bottom to top, an output end of the photomultiplier 7-3 is connected to a signal processing circuit module 7-4, and the signal processing circuit module 7-4 is connected to an input end of the local radiation processing unit 9.
In specific implementation, the plastic scintillator 7-1 adopts a beta plastic scintillator, the thickness of the beta plastic scintillator is 0.5 mm-1 mm, and the detection area is about 300cm2The large-area plastic scintillator is adopted, so that the counting rate of beta rays can be increased, the detection efficiency is improved, and the detection lower limit is reduced; in order to improve the strength and the light absorption efficiency of the beta plastic scintillator, an organic glass light guide 7-2 with the thickness of 10mm is tightly attached to the back of the beta plastic scintillator; the photomultiplier 7-3 is arranged at the central position of the organic glass light guide 7-2; the signal processing circuit module 7-4 comprises two circuit boards, one of which is used for carrying out pre-amplification, discrimination and formed current integration and voltage-frequency conversion on the signal of the photomultiplier tube 7-3, and the other is used for pulse counting, data acquisition and external communication.
In this embodiment, as shown in fig. 4, the inert gas sampling pipeline includes a sampling gas inlet interface 11, a purge gas inlet interface 12, and a gas return interface 13, which are all disposed on the upper portion of the mounting plate 2, and a detection gas inlet chamber interface 14, a detection gas return chamber interface 15, a first sampling pump inlet interface 16, a first sampling pump gas return interface 17, a second sampling pump inlet interface 18, and a second sampling pump gas return interface 19, which are all disposed on the lower portion of the mounting plate 2; the detection air inlet cavity interface 14 and the detection air return cavity interface 15 are connected with the inert gas sampling chamber 6 through hoses, the first sampling pump air inlet interface 16 and the first sampling pump air return interface 17 are connected with the first sampling pump 3 through hoses, and the second sampling pump air inlet interface 18 and the second sampling pump air return interface 19 are connected with the second sampling pump 4 through hoses.
In this embodiment, the sampling gas inlet 11 is connected to a steam-water separator for dehumidifying high-humidity inert gas.
When specifically implementing, the high humidity inert gas that is surveyed is when getting into inert gas sample pipeline, because temperature equals with ambient temperature in the inert gas sample pipeline, and mostly is stainless steel metal surface, is surveyed moisture among the high humidity inert gas and easily meets the cold condensation, causes ponding in the inert gas sample pipeline, influences the measurement, consequently need carry out dehumidification before high humidity inert gas gets into inert gas sample pipeline.
In this embodiment, as shown in fig. 4, the inert gas sampling pipeline is sequentially provided with an aerosol and iodine filtering component, a flow regulating valve 20 and a flow meter 21 along the airflow direction.
In specific implementation, the gas flow in the inert gas sampling pipeline is monitored by the flow meter 21, and the gas flow can be manually adjusted by the flow adjusting valve 20.
In this embodiment, as shown in fig. 4, the aerosol and iodine filtering assembly includes a first aerosol and iodine filtering pipeline and a second aerosol and iodine filtering pipeline, the first aerosol and iodine filtering pipeline includes a first valve 22, a first aerosol and iodine filter 23, and a second valve 24 that are sequentially arranged along with the air intake direction, the second aerosol and iodine filtering pipeline includes a third valve 25, a second aerosol and iodine filter 26, and a fourth valve 27 that are sequentially arranged along with the air intake direction, and the first aerosol and iodine filtering pipeline and the second aerosol and iodine filtering pipeline have the same structure and are redundant to each other.
During specific implementation, the first valve 22, the second valve 24, the third valve 25 and the fourth valve 27 are manual valves, the first aerosol and iodine filtering pipeline and the second aerosol and iodine filtering pipeline work separately, one way of work is that the other way is closed completely, and the way of closing can be changed by filter paper and changed by an iodine box, so that the whole system can be ensured to operate uninterruptedly, and the two pipelines are switched through the manual valves.
When the utility model is used, the electric control box 8 controls the power supply of the first sampling pump 3 or the second sampling pump 4 to work, the high-humidity inert gas is dehumidified by the steam-water separation device and then enters the aerosol and iodine filtering component, and the high-humidity inert gas reaches the inert gas sampling chamber 6 after filtering the aerosol, iodine and particles in the sampling gas; inert gas detector 7 for inert gas entering inert gas sampling chamber 685Kr and133the beta total activity concentration of the Xe species is detected and the detection results are transmitted to the in situ radiation processing unit 9; the local radiation processing unit 9 processes and displays the detection result, and when the detection result exceeds a predetermined threshold value, the local radiation processing unit processes and displays the detection resultAnd outputting corresponding alarm signals.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (9)
1. A high humidity inert gas activity monitoring device which characterized in that: the device comprises a bracket, the support includes mounting panel (2) of bottom plate (1) and vertical setting, be provided with first sample pump (3), second sample pump (4) and lead shielding room (5) on bottom plate (1), be provided with inert gas in lead shielding room (5) and sample room (6) and inert gas detector (7), the front of mounting panel (2) is provided with electrical control box (8) and radiation processing unit (9) on the spot, the back of mounting panel (2) is provided with inert gas sample pipeline.
2. A high humidity inert gas activity monitoring device according to claim 1, wherein: the first sampling pump (3) and the second sampling pump (4) are independent and redundant.
3. A high humidity inert gas activity monitoring device according to claim 1, wherein: the inert gas sampling chamber (6) is a sealed chamber with the volume of 3.47L.
4. A high humidity inert gas activity monitoring device according to claim 1, wherein: the inert gas detector (7) is arranged at the upper part of the inert gas sampling chamber (6).
5. A high humidity inert gas activity monitoring device according to claim 1, wherein: the inert gas detector (7) comprises a plastic scintillator (7-1), an organic glass light guide (7-2) and a photomultiplier (7-3) which are sequentially arranged from bottom to top, the output end of the photomultiplier (7-3) is connected with a signal processing circuit module (7-4), and the signal processing circuit module (7-4) is connected with the input end of the local radiation processing unit (9).
6. A high humidity inert gas activity monitoring device according to claim 1, wherein: the inert gas sampling pipeline comprises a sampling gas inlet interface (11), a purging gas inlet interface (12) and a gas return interface (13) which are all arranged at the upper part of the mounting plate (2), and a detection gas inlet chamber interface (14), a detection gas return chamber interface (15), a first sampling pump gas inlet interface (16), a first sampling pump gas return interface (17), a second sampling pump gas inlet interface (18) and a second sampling pump gas return interface (19) which are all arranged at the lower part of the mounting plate (2); survey air intake chamber interface (14) and survey return air chamber interface (15) and all be connected with inert gas sampling room (6) through the hose, first sample pump air intake interface (16) and first sample pump return air interface (17) all are connected with first sample pump (3) through the hose, second sample pump air intake interface (18) and second sample pump return air interface (19) all are connected with second sample pump (4) through the hose.
7. A high humidity inert gas activity monitoring device according to claim 6, wherein: the sampling gas inlet interface (11) is connected with a steam-water separation device for dehumidifying high-humidity inert gas.
8. A high humidity inert gas activity monitoring device according to claim 1, wherein: the inert gas sampling pipeline is sequentially provided with an aerosol and iodine filtering component, a flow regulating valve (20) and a flowmeter (21) along the airflow direction.
9. A high humidity inert gas activity monitoring device according to claim 8, wherein: the aerosol and iodine filtering component comprises a first aerosol and iodine filtering pipeline, a second aerosol and iodine filtering pipeline, the first aerosol and iodine filtering pipeline comprises a first valve (22), a first aerosol and iodine filter (23) and a second valve (24) which are sequentially arranged along the air inlet direction, the second aerosol and iodine filtering pipeline comprises a third valve (25), a second aerosol and iodine filter (26) and a fourth valve (27) which are sequentially arranged along the air inlet direction, and the first aerosol and iodine filtering pipeline and the second aerosol and iodine filtering pipeline are the same in structure and are redundant to each other.
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| CN202121434556.3U CN215297689U (en) | 2021-06-25 | 2021-06-25 | High humidity inert gas activity monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527237A (en) * | 2022-01-14 | 2022-05-24 | 陕西卫峰核电子有限公司 | Method and system for improving detection upper limit of inert gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527237A (en) * | 2022-01-14 | 2022-05-24 | 陕西卫峰核电子有限公司 | Method and system for improving detection upper limit of inert gas |
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