CN215218555U - Sodium flame method detecting system - Google Patents
Sodium flame method detecting system Download PDFInfo
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- CN215218555U CN215218555U CN202022178518.8U CN202022178518U CN215218555U CN 215218555 U CN215218555 U CN 215218555U CN 202022178518 U CN202022178518 U CN 202022178518U CN 215218555 U CN215218555 U CN 215218555U
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Abstract
The invention belongs to the field of nuclear detection, and particularly relates to a sodium flame method detection system. Nuclear power plants are therefore currently replacing a large number of various ventilation filters each year, generating large radioactive technical wastes. The device comprises a fogging device, an air duct system, a compressed air supply system, a sampling device and a detection device; the fog generating device comprises a fog spraying box, and the fog spraying box is connected with an air duct system. The device is intensive, small and easy to move, and can realize the detection of the air filter in a plurality of nuclear power stations. The container is internally provided with a temperature control exhaust system, so that the operating environment is kept at a normal temperature and a normal humidity environment, and the detection accuracy is ensured.
Description
Technical Field
The utility model belongs to nuclear detection area, concretely relates to sodium flame method detecting system.
Background
During the operation of the nuclear power unit, in order to ensure that radioactive substances existing in the control area do not leak to the environment, the radiation control area is provided with a special ventilation system and an air filtering device so as to purify and trap radioactive particles in the air. A large number of various ventilation filters must therefore be replaced each year, generating large radioactive technical waste.
In order to reduce the generation amount of radioactive wastes and reduce cost and improve efficiency, a leadership organization for company waste minimization develops special research and development work of 'nuclear-grade high-efficiency air filter metal framework reuse'. After the reusable filter with the metal frame reaches the service life, the disassembled metal frame is recycled, and glue is filled again for assembly to form a newly produced filter. According to the requirements of the national standard nuclear-grade high-efficiency air filter (GB _ T17939-2015), the produced nuclear-grade high-efficiency air filter needs to be subjected to efficiency and resistance detection. Therefore, the efficiency and resistance detection work of the metal frame multiplexing nuclear-grade high-efficiency air filter needs to be carried out on each nuclear power plant site, so that an intensive mobile sodium flame method detection system of the air filter is developed.
Disclosure of Invention
1. The purpose is as follows:
according to the production condition of the nuclear-grade efficient air filter for assembly and reuse, the efficiency and resistance detection work of the metal frame reuse type nuclear-grade efficient air filter in each nuclear power plant site is realized.
2. The technical scheme is as follows:
a sodium flame method detection system comprises a fogging device, an air duct system, a compressed air supply system, a sampling device and a detection device; the fog generating device comprises a fog spraying box, and the fog spraying box is connected with an air duct system.
The compressed air supply system is placed independently of the fogging device.
The air duct system comprises a fan, a heater and a mixing and drying section; the fan passes through pipeline and heater, mixes dry section, and the baffle-box connects gradually.
The air duct system is positioned below the detection device.
The detection device comprises a hydrogen generator and a detection platform; the hydrogen generator is fixedly arranged below the detection platform, and the sampling valve and the combustor are fixedly arranged on the detection platform.
In the sampling device, the diaphragm valve is arranged on the sampling tube A, the sampling tube B penetrates through the detection device, and the tail end of the sampling tube B is fixedly connected with the buffer tank.
The system is integrally installed in the container.
3. The effect is as follows:
the mobile air filter sodium flame method detection system passes the identification, has good effect after the trial operation, and can meet the requirement of the field on the performance detection of the air filter.
Drawings
FIG. 1 is a front view of a sodium flame method detection system
FIG. 2 is a top view of a sodium flame detection system
FIG. 3 is a front view of a detection table of a sodium flame detection system
FIG. 4 is a front view of a spray box of a sodium flame detection system
FIG. 5 is a top view of a buffer tank of a sodium flame detection system
FIG. 6 is a front view of a buffer box of a sodium flame detection system
FIG. 7 is a three-dimensional view of a sampling tube A
FIG. 8 is a perspective view of sampling tube B
In the figure: 1. a detection table; 2. a spray box; 3. a hydrogen generator; 4. a detection device; 5. a compressed air supply system; 6. a fan; 7. a buffer tank; 8. a sampling tube A; 9. a sampling valve; 10. a sampling tube B; 11. a burner; 12. an aperture valve; 13. a heater; 14. and (5) a mixing and drying section.
Detailed Description
The mobile air filter sodium flame method detection system is designed according to the requirements of 'efficiency and resistance of high efficiency air filter performance test method' (GB/T6165) and is used for detecting the efficiency and resistance of an air filter. The system comprises a detection platform, a spray box, a hydrogen generator, an aerosol and detection device, an air duct system and a compressed air supply system. All the above equipment components are installed in a 40GP container, so that the detection equipment is intensified, miniaturized and easy to circulate, and the detection of the air filter in a plurality of nuclear power stations can be realized. The container is internally provided with a temperature control exhaust system, so that the operating environment is kept at a normal temperature and a normal humidity environment, and the detection accuracy is ensured.
Principle of detection equipment
The sodium flame method detection system of the movable air filter mainly comprises four parts, namely a fogging device, an air duct system and an aerosol sampling and detecting device.
1. Systematic fogging and detection principle
Atomizing the sodium chloride aqueous solution in the spray box 2 by a heater 13 by using clean compressed air to form salt-containing fog drop aerosol; mixed with clean hot air from the fan 6 heated and filtered by the heater 13, water in the fog drops is evaporated in the mixing and drying section 14, and the airflow reaches the buffer tank 7 to form uniform polydisperse solid aerosol. The gas flow from the buffer tank 7 is followed by a stabilization process to substantially equalize the velocity field and concentration field of the aerosol at the orifice of the front sampling tube A8.
The aerosol has a majority particle size of less than 2 μm, a mass median diameter of about 0.5 μm, and a geometric standard deviation of less than 2. The aperture valve 12 of the air duct system controls the air flow after the test to be discharged from the tail end of the air duct. The aerosol sampling is realized by pressing the static pressure in the air duct into the detection system through the front sampling tube B10 and the rear sampling tube B10 of the tested filter, and alternately sampling the front aerosol and the rear aerosol of the filter by rotating the handle of the sampling valve 9. The raw aerosol enters the burner 11 through a flow meter L3. Sodium atoms contained in the aerosol are excited by high temperature of hydrogen flame in a burner to emit yellow characteristic light with the wavelength of about 589nm, and the intensity of the yellow characteristic light is in direct proportion to the mass concentration of the aerosol. The light intensity value of sodium is converted into a light current value by a photoelectric converter and detected by a photoelectric measuring instrument. The filter transmittance P is the ratio of the filtered aerosol concentration to the original aerosol concentration, expressed as a percentage.
2. Plant operation assurance
Detection system
According to the detection principle, special detection system software is provided, all detection data are calculated through a computer, and the correctness of the detection data of the filter is guaranteed.
Air duct system
The air duct system is installed with GB/T6165 design and manufacture, and in order to ensure the accuracy of detection data, a heater is arranged in the air duct system to ensure that the air inlet temperature of the system is not less than +/-5 ℃; the relative humidity of the air at the inlet of the buffer tank is not higher than 30%.
Compressed air supply system
The system detection needs clean compressed air, and a special air compressor is arranged for equipment, so that the normal operation of the detection equipment is ensured. In order to create a good detection environment, the air compressor is placed in a closed sound insulation environment (provided with an air inlet and an air outlet), and noise is effectively reduced.
Temperature control exhaust system
In order to keep the constant temperature and humidity of the operation environment, a temperature control exhaust system is arranged, and when the temperature of the equipment exceeds the standard, the exhaust system is automatically opened, so that the constant temperature and humidity environment is kept inside the equipment.
3. Intensive, small and movable
The air filter detection system is characterized in that all necessary equipment and facilities are installed in a 40GP container, and is generally called as an intensive mobile sodium flame method detection system of the air filter. Has the characteristics of intensification, miniaturization and easy circulation.
Claims (4)
1. A sodium flame method detecting system is characterized in that: the system comprises a fogging device, an air duct system, a compressed air supply system (5), a sampling device and a detection device; the fog generating device comprises a fog spraying box (2), and the fog spraying box (2) is connected with a wind channel system; the air duct system comprises a fan (6), a heater (13) and a mixing and drying section (14); the fan (6) is connected with the heater (13), the mixing and drying section (14) and the buffer tank (7) in sequence through pipelines; in the sampling device, an aperture valve (12) is arranged behind a sampling tube A (10), a sampling tube B (8) is arranged in front of a detection device (4), and the tail end of the sampling tube B is fixedly connected with a buffer tank (7).
2. The sodium flame detection system of claim 1, wherein: the compressed air supply system (5) is arranged independently of the fogging device.
3. The sodium flame detection system of claim 1, wherein: the air duct system is positioned below the detection device.
4. The sodium flame detection system of claim 1, wherein: the detection device comprises a hydrogen generator (3) and a detection platform (1); the hydrogen generator (3) is fixedly arranged below the detection platform (1), and the sampling valve (9) and the combustor (11) are fixedly arranged on the detection platform (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022178518.8U CN215218555U (en) | 2020-09-29 | 2020-09-29 | Sodium flame method detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022178518.8U CN215218555U (en) | 2020-09-29 | 2020-09-29 | Sodium flame method detecting system |
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| CN215218555U true CN215218555U (en) | 2021-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255217A (en) * | 2020-09-29 | 2021-01-22 | 中核核电运行管理有限公司 | Sodium flame method detecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255217A (en) * | 2020-09-29 | 2021-01-22 | 中核核电运行管理有限公司 | Sodium flame method detecting system |
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