CN114371117A - Multifunctional composite measuring system for measuring filtering efficiency of different devices and application - Google Patents
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- 238000001914 filtration Methods 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 239000000443 aerosol Substances 0.000 claims abstract description 95
- 239000011630 iodine Substances 0.000 claims abstract description 61
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 61
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000005070 sampling Methods 0.000 claims abstract description 59
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000004817 gas chromatography Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- -1 iodine ions Chemical class 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 33
- 238000007599 discharging Methods 0.000 description 5
- 230000002285 radioactive effect Effects 0.000 description 4
- 239000000941 radioactive substance Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000004992 fission Effects 0.000 description 3
- 239000012857 radioactive material Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Fluid Mechanics (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a multifunctional composite measuring system for measuring filtering efficiency of different devices and application thereof. According to the invention, the multi-branch sample distribution section and the multi-branch sampling section are arranged, so that the measuring system has multiple functions, and the filtering efficiency of equipment to be measured on different types of samples to be measured can be tested, and the method is simpler and more convenient. According to different types of samples to be detected, specific sampling sections are selected, and each sampling section is used for measuring the concentration of the samples to be detected, such as aerosol, iodine simple substance, methyl iodine and the like, and is not influenced mutually. The multifunctional composite measuring system adopts a more targeted measuring method aiming at the characteristics of different types of samples to be measured, and can realize the measurement of the filtering efficiency of different filtering equipment on different types of samples to be measured, such as aerosol, iodine simple substance, methyl iodide and the like, by adjusting the position of a corresponding valve under the condition of not modifying a test device.
Description
Technical Field
The invention relates to the technical field of aerosol, in particular to a multifunctional composite measuring system for measuring the filtering efficiency of different devices and application thereof.
Background
In the prior art, if a hypothetical serious accident occurs in a nuclear power plant, the reactor core is cooled down to melt the reactor core, and part of radioactive fission products enter the atmospheric space of a containment vessel along with water vapor and non-condensable gas in the melting process to form organic iodine, aerosol and the like. The containment vessel is used as a last containment barrier for preventing radioactive substances from being released into the environment of a nuclear power plant, if the containment vessel fails due to an accident, radioactive aerosol, organic iodine and the like in the atmosphere in the containment vessel become main carriers released by the radioactive atmosphere, and the removal characteristics of the aerosol, the organic iodine and the like under the nuclear accident directly relate to the size of the radioactive consequence after the accident. In certain hypothetical accidents, the containment vessel may continue to be overpressurized and thus damaged as the last containment barrier to prevent radioactive material from being released into the environment. To prevent damage to the containment, one mode of processing is to release containment gas when the containment pressure approaches a design threshold. The released gas includes various radioactive substances besides air and steam, and representative radioactive substances include organic iodine, aerosol, and the like. To prevent such radioactive materials from escaping, a containment filtration venting system is typically provided in the design of the containment, primarily for filtering the radioactive materials in the gases released to the atmosphere within the containment.
In recent years, the filtering efficiency of aerosol, organic iodine and the like is continuously improved by the optimized design of each mechanism on a filtering and discharging system. However, the conventional filtering and discharging device measuring system is often used for measuring the filtering efficiency of a certain type of specific fission product, and cannot effectively measure the filtering efficiency of different fission products respectively. Aiming at different filtering and discharging systems, a special measuring system is needed to measure the filtering capacity and the efficiency of the filtering and discharging system. After the substance to be measured is changed, the measurement system needs to be greatly changed, which brings great inconvenience.
Therefore, the prior art has yet to be improved.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a multifunctional composite measuring system for measuring the filtration efficiency of different devices and application thereof.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a multifunctional composite measuring system for measuring filtration efficiency of different devices, wherein the multifunctional composite measuring system comprises a steam branch, an air branch, a test section, a sample distribution section and a sampling section; the steam branch comprises a steam generator, a steam superheater, a check valve and a flow meter; the air branch comprises an air compressor, an air storage tank, a control valve and a compressed air heater; the sample dispensing section comprises an iodine/aerosol injection port and an air/vapor/aerosol mixing box; the sampling section comprises an inlet sampling device, an outlet sampling device, a mesh filter, an aerosol filter, a gas washing bottle for sampling, a plate cooler, a water condenser, a drying filter screen and a volume flowmeter; the test section is used for installing equipment to be tested.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized in that the steam superheater is arranged at the downstream of the steam generator, the air storage tank is arranged at the downstream of the air compressor, and the air/steam/aerosol mixing box is arranged at the downstream of the iodine/aerosol injection port.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized in that the sampling section is divided into three paths, namely an aerosol measuring branch, an iodine vapor concentration measuring branch and a methyl iodide concentration measuring branch.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized in that the iodine/aerosol injection port is divided into three paths which are respectively used for injecting aerosol, iodine elementary substance and methyl iodide into the aerosol measuring branch, the iodine vapor concentration measuring branch and the methyl iodide concentration measuring branch; the inlet sampling device is divided into three paths and is respectively connected with the aerosol measuring branch before filtration, the iodine vapor concentration measuring branch and the methyl iodide concentration measuring branch; the outlet sampling device is divided into three paths and is respectively connected with the filtered aerosol measuring branch, the filtered iodine vapor concentration measuring branch and the filtered methyl iodide concentration measuring branch.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized in that the devices to be measured comprise a Venturi scrubber, a bubbler and an adsorption filter.
In a second aspect, the present invention further provides an application of the multifunctional composite measuring system for measuring filtration efficiency of different devices, wherein the multifunctional composite measuring system as described above is applied to measure filtration efficiency of different filtration devices for aerosol, iodine simple substance, and methyl iodide.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is applied, wherein when the multifunctional composite measuring system is applied to measure the filtering efficiency of a device to be measured, the air branch is used for providing compressed air for a test section, and the steam branch is used for providing steam for the test section; after the air branch and the steam branch are collected, the air/steam/aerosol mixture flows through an air/steam/aerosol mixing box to uniformly mix media to be measured, and then the media enter equipment to be measured for filtering; the device comprises an air/steam/aerosol mixing box, an inlet sampling device and an outlet sampling device, wherein the inlet sampling device is arranged behind the air/steam/aerosol mixing box and used for monitoring the content of a medium to be detected before filtering, the outlet sampling device is arranged behind equipment to be detected and used for measuring the content of the medium to be detected after filtering, and the filtering efficiency of the equipment to be detected is calculated through content comparison before and after filtering.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is applied, wherein the aerosol measuring branch adopts a weighing method to measure the aerosol concentration, and the specific steps comprise: during sampling, the mixed gas firstly passes through an aerosol filter, and the aerosol is intercepted by a filter membrane; then the residual gas flows into the plate heat exchanger and the condensate tank, and the gas flow is measured by the mass flowmeter after drying; and finally, measuring the front and rear mass of a filter membrane of the aerosol filter to obtain the total mass of the aerosol, and calculating the concentration of the aerosol according to the gas flow.
The multifunctional composite measuring system for measuring the filtering efficiency of different devices is applied, wherein the iodine steam measuring branch adopts a spectrophotometer method to measure the concentration of iodine steam, and the specific steps comprise: during sampling, gas passes through a gas washing bottle filled with potassium iodide solution, iodine elementary substance is retained and contacts with iodine ions to generate I3 -And shows yellow; the residual gas is continuously dried by the plate heat exchanger and the condensate tank, and then enters the mass flowmeter to be discharged after the flow is measured; finally, by comparison with standard I3 -Obtaining the total mass of the iodine vapor by a solution curve, and calculating the concentration of the iodine vapor according to the gas flow.
The multifunctional composite measuring system for measuring the filtration efficiency of different devices is applied, wherein the methyl iodide concentration measuring branch adopts a gas chromatography technology to measure the methyl iodide concentration, and the specific steps comprise: during sampling, after the gas is cooled by the plate heat exchanger, the flow value is measured by the mass flow meter, and then the gas enters a gas chromatograph for analysis, and the concentration of methyl iodide is calculated according to the analysis result and the gas flow.
Has the advantages that: the invention provides a multifunctional composite measuring system for measuring filtering efficiency of different devices and application thereof. According to the invention, the multi-branch sample distribution section and the multi-branch sampling section are arranged in the multifunctional composite measuring system, so that the measuring system has multiple functions, and the filtering efficiency of equipment to be measured on different types of samples to be measured can be tested, and the multifunctional composite measuring system is simpler and more convenient. According to different types of samples to be tested, specific sampling sections are selected, each sampling section is used for measuring the concentration of the samples to be tested such as aerosol, iodine simple substance, methyl iodide and the like, the operation is simple and convenient, and test branches are not affected mutually. The multifunctional composite measuring system provided by the invention is suitable for various aerosol filtering devices, adopts a more targeted measuring method aiming at different characteristics of different types of samples to be measured, and can realize the measurement of the filtering efficiency of different types of samples to be measured, such as aerosol, iodine simple substance, methyl iodide and the like, by different filtering devices by adjusting the positions of corresponding valves under the condition of not modifying a test device.
Drawings
Fig. 1 is a schematic diagram of a multifunctional composite measuring system for measuring filtration efficiency of different devices according to an embodiment of the present invention.
The system comprises a steam generator 1, a steam superheater 2, a check valve 3, a flow meter 4, an air compressor 5, an air storage tank 6, a control valve 7, a pressure measuring instrument 8, a temperature measuring instrument 9, a compressed air heater 10, an iodine/aerosol injection port 11, an air/steam/aerosol mixing box 12, an inlet sampling device 13, equipment to be tested 14, an outlet sampling device 15, a grid filter 16, a stop valve 17, an aerosol filter 18, a sampling gas washing bottle 19, a plate cooler 20, a water condenser 21, a drying filter screen 22 and a volume flow meter 23.
Detailed Description
The invention provides a multifunctional composite measuring system for measuring the filtering efficiency of different devices and application thereof, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a multifunctional composite measuring system for measuring filtering efficiency of different devices, which comprises a steam branch, an air branch, a test section, a sample distribution section and a sampling section, and specifically comprises the following components as shown in figure 1: the steam branch consists of a steam generator 1, a steam superheater 2 arranged at the downstream of the steam generator 1, a check valve 3 and a flow meter 4; an air branch consisting of an air compressor 5, an air storage tank 6 arranged at the downstream of the air compressor 5, a control valve 7 and a compressed air heater 10; a sample distribution section consisting of an iodine/aerosol injection port 11, an air/vapour/aerosol mixing box 12 arranged downstream of the iodine/aerosol injection port 11; a sampling section consisting of an inlet sampling device 13, an outlet sampling device 15, a mesh filter 16, an aerosol filter 18, a gas washing bottle 19 for sampling, a plate cooler 20, a water condenser 21, a drying filter screen 22 and a volume flow meter 23; the test section is used to mount the device under test 14. The inlet sampling device 13 in fig. 1 is divided into three paths, and the three paths are respectively connected with the aerosol measurement branch before filtration, the iodine vapor concentration measurement branch and the methyl iodide concentration measurement branch; the outlet sampling device 15 is also divided into three paths, and the three paths are respectively connected with the filtered aerosol measuring branch, the filtered iodine vapor concentration measuring branch and the filtered methyl iodide concentration measuring branch.
In some embodiments, the device under test comprises an aerosol removal filtration device, such as a venturi scrubber, a bubbler, an adsorption filter, and the like, but is not limited thereto.
In some embodiments, an air bypass is used to provide compressed air to the test section. After the compressed air flows out of the air compressor, the compressed air is subjected to three-stage filtration to remove impurities in the air; then reducing the pressure to the working condition required by the test through a pressure reducing valve; then, the mass flow of the air is measured by a vortex shedding flowmeter; an adjusting valve is arranged behind the flowmeter and used for adjusting the required compressed air flow; then heating the air to the required test temperature by an air heater; the tail end of the air branch is also provided with a check valve for preventing backflow.
In some embodiments, the steam branch is used for providing steam to the test section, and the steam branch and the air branch jointly simulate the atmospheric environment under the accident condition in the containment. Heating steam by electric heating, and connecting a pressure reducing valve to produce steam under required pressure; then setting the required steam flow through a regulating valve; then connect the steam heater, heat the steam to the little superheated state, and then pass through the check valve and connect the test section.
In some embodiments, the sample distribution section and the sampling section are used to provide the sample to be tested to the testing section. The sampling section is divided into three paths, namely an aerosol measuring branch, an iodine vapor concentration measuring branch and a methyl iodide concentration measuring branch.
In some embodiments, the iodine/aerosol injection port is divided into three parts, and used for injecting aerosol, iodine elementary substance and methyl iodide into the aerosol measurement branch, the iodine vapor concentration measurement branch and the methyl iodide concentration measurement branch respectively; the inlet sampling device is divided into three paths and is respectively connected with the aerosol measuring branch before filtration, the iodine vapor concentration measuring branch and the methyl iodide concentration measuring branch; the outlet sampling device is divided into three paths and is respectively connected with the filtered aerosol measuring branch, the filtered iodine vapor concentration measuring branch and the filtered methyl iodide concentration measuring branch.
In some embodiments, the test section is used to perform aerosol cleaning device tests. After the air branch and the steam branch are collected, the mixture flows through an air/steam/aerosol mixing box to uniformly mix the medium to be measured; then entering equipment to be tested, and carrying out an aerosol removal equipment test; the rest tail gas enters an exhaust port.
In front of the air/vapour/aerosol mixing box, a sample dispensing interface is provided. During the test, aerosol, iodine vapor or methyl iodide and the like enter the sample distribution section through different branches of the iodine/aerosol injection port. An inlet sampling device is arranged behind the air/steam/aerosol mixing box and is used for monitoring the content of the medium before filtration. An outlet sampling device is arranged behind the aerosol filtering equipment (such as a Venturi scrubber and the like) and is used for measuring the content of the filtered medium. And analyzing the filtering effect of the equipment to be tested through content comparison before and after filtering.
In some embodiments, the aerosol measurement branch measures the aerosol concentration by a weighing method; the iodine vapor measuring branch adopts a spectrophotometer method to measure the concentration of iodine vapor; the methyl iodide gas measuring branch adopts a gas chromatography technology to measure the methyl iodide concentration.
In some embodiments, the specific steps of the aerosol measurement branch measuring the aerosol concentration by using a weighing method comprise: during sampling, the mixed gas firstly passes through an aerosol filter, and the aerosol is intercepted by a filter membrane; then the residual gas flows into the plate heat exchanger and the condensate tank, and the gas flow is measured by the mass flowmeter after drying; and finally, measuring the front and rear mass of a filter membrane of the aerosol filter to obtain the total mass of the aerosol, and calculating the concentration of the aerosol according to the gas flow.
In some embodiments, the specific steps of measuring the iodine vapor concentration by the iodine vapor measuring branch line by using a spectrophotometer method comprise: during sampling, the gas is washed by potassium iodide solutionIn the gas cylinder, iodine elementary substance is retained and contacts with iodide ions to generate I3 -And shows yellow; the residual gas is continuously dried by the plate heat exchanger and the condensate tank, and then enters the mass flowmeter to be discharged after the flow is measured; finally, by comparison with standard I3 -Obtaining the total mass of the iodine vapor by a solution curve, and calculating the concentration of the iodine vapor according to the gas flow.
In some embodiments, the specific steps of the methyl iodide concentration measuring branch for measuring the methyl iodide concentration by using the gas chromatography technology comprise: during sampling, after the gas is cooled by the plate heat exchanger, the flow value is measured by the mass flow meter, and then the gas enters a gas chromatograph for analysis, and the concentration of methyl iodide is calculated according to the analysis result and the gas flow.
The embodiment of the invention also provides an application of the multifunctional composite measuring system for measuring the filtering efficiency of different devices, and the multifunctional composite measuring system is applied to measuring the filtering efficiency of different filtering devices on aerosol, iodine simple substance and methyl iodide, but not limited to the application.
In some embodiments, the multifunctional composite measuring system is applied to measuring the filtering efficiency of different types of filtering equipment of a pressurized water reactor nuclear power station containment filtering and discharging system on aerosol, elementary iodine and methyl iodide.
In some embodiments, the multifunctional composite measuring system can be modified appropriately according to actual conditions to adapt to the measurement of the filtering efficiency of other radioactive substances.
In summary, the present invention provides a multifunctional composite measuring system for measuring filtration efficiency of different devices and applications thereof, wherein the multifunctional composite measuring system comprises subsystems such as an air branch, a steam branch, a test section, a sample distribution section, and a sampling section. According to the invention, the multi-branch sample distribution section and the multi-branch sampling section are arranged in the multifunctional composite measuring system, so that the measuring system has multiple functions, and the filtering efficiency of equipment to be measured on different types of samples to be measured can be tested, and the multifunctional composite measuring system is simpler and more convenient. According to different types of samples to be tested, specific sampling sections are selected, each sampling section is used for measuring the concentration of the samples to be tested such as aerosol, iodine simple substance, methyl iodide and the like, the operation is simple and convenient, and test branches are not affected mutually. The multifunctional composite measuring system provided by the invention is suitable for various aerosol filtering devices, adopts a more targeted measuring method aiming at different characteristics of different types of samples to be measured, and can realize the measurement of the filtering efficiency of different types of samples to be measured, such as aerosol, iodine simple substance, methyl iodide and the like, by different filtering devices by adjusting the positions of corresponding valves under the condition of not modifying a test device.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized by comprising a steam branch, an air branch, a test section, a sample distribution section and a sampling section; the steam branch comprises a steam generator, a steam superheater, a check valve and a flow meter; the air branch comprises an air compressor, an air storage tank, a control valve and a compressed air heater; the sample dispensing section comprises an iodine/aerosol injection port and an air/vapor/aerosol mixing box; the sampling section comprises an inlet sampling device, an outlet sampling device, a mesh filter, an aerosol filter, a gas washing bottle for sampling, a plate cooler, a water condenser, a drying filter screen and a volume flowmeter; the test section is used for installing equipment to be tested.
2. The multifunctional composite measuring system for measuring filtration efficiency of different equipment according to claim 1, wherein said steam superheater is disposed downstream of said steam generator, said air storage tank is disposed downstream of said air compressor, and said air/steam/aerosol mixing tank is disposed downstream of said iodine/aerosol injection port.
3. The multifunctional composite measuring system for measuring the filtration efficiency of different equipment according to claim 1, wherein the sampling section is divided into three paths, namely an aerosol measuring path, an iodine vapor concentration measuring path and a methyl iodide concentration measuring path.
4. The multifunctional composite measuring system for measuring the filtering efficiency of different devices according to claim 3, wherein the iodine/aerosol injection port is divided into three parts, which are respectively used for injecting aerosol, iodine elementary substance and methyl iodine into the aerosol measuring branch, the iodine vapor concentration measuring branch and the methyl iodine concentration measuring branch; the inlet sampling device is divided into three paths and is respectively connected with the aerosol measuring branch before filtration, the iodine vapor concentration measuring branch and the methyl iodide concentration measuring branch; the outlet sampling device is divided into three paths and is respectively connected with the filtered aerosol measuring branch, the filtered iodine vapor concentration measuring branch and the filtered methyl iodide concentration measuring branch.
5. The multifunctional composite measuring system for measuring the filtration efficiency of different devices according to claim 1, wherein the devices to be measured comprise venturi scrubbers, bubblers, adsorption filters.
6. Use of a multifunctional combined measuring system for measuring filtration efficiency of different equipment, characterized in that the multifunctional combined measuring system according to any one of claims 1 to 5 is used for measuring filtration efficiency of different filtration equipment for aerosol, iodine simple substance and methyl iodine.
7. The application of the multifunctional composite measuring system for measuring the filtering efficiency of different devices is characterized in that when the multifunctional composite measuring system is used for measuring the filtering efficiency of a device to be measured, the air branch is used for providing compressed air to the test section, and the steam branch is used for providing steam to the test section; after the air branch and the steam branch are collected, the air/steam/aerosol mixture flows through an air/steam/aerosol mixing box to uniformly mix media to be measured, and then the media enter equipment to be measured for filtering; the device comprises an air/steam/aerosol mixing box, an inlet sampling device and an outlet sampling device, wherein the inlet sampling device is arranged behind the air/steam/aerosol mixing box and used for monitoring the content of a medium to be detected before filtering, the outlet sampling device is arranged behind equipment to be detected and used for measuring the content of the medium to be detected after filtering, and the filtering efficiency of the equipment to be detected is calculated through content comparison before and after filtering.
8. The application of the multifunctional composite measuring system for measuring the filtering efficiency of different devices according to claim 6 is characterized in that the aerosol measuring branch adopts a weighing method to measure the aerosol concentration, and the specific steps comprise: during sampling, the mixed gas firstly passes through an aerosol filter, and the aerosol is intercepted by a filter membrane; then the residual gas flows into the plate heat exchanger and the condensate tank, and the gas flow is measured by the mass flowmeter after drying; and finally, measuring the front and rear mass of a filter membrane of the aerosol filter to obtain the total mass of the aerosol, and calculating the concentration of the aerosol according to the gas flow.
9. The application of the multifunctional composite measuring system for measuring the filtering efficiency of different devices as claimed in claim 6, wherein the iodine vapor measuring branch adopts a spectrophotometer method to measure the concentration of iodine vapor, and the specific steps comprise: during sampling, gas passes through a gas washing bottle filled with potassium iodide solution, iodine elementary substance is retained and contacts with iodine ions to generate I3 -And shows yellow; the residual gas is continuously dried by the plate heat exchanger and the condensate tank, and then enters the mass flowmeter to be discharged after the flow is measured; finally, by comparison with standard I3 -Obtaining the total mass of the iodine vapor by a solution curve, and calculating the concentration of the iodine vapor according to the gas flow.
10. The application of the multifunctional composite measuring system for measuring the filtration efficiency of different devices according to claim 6, wherein the methyl iodide concentration measuring branch adopts a gas chromatography technology to measure the methyl iodide concentration, and the specific steps comprise: during sampling, after the gas is cooled by the plate heat exchanger, the flow value is measured by the mass flow meter, and then the gas enters a gas chromatograph for analysis, and the concentration of methyl iodide is calculated according to the analysis result and the gas flow.
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| CN202111677979.2A CN114371117A (en) | 2021-12-31 | 2021-12-31 | Multifunctional composite measuring system for measuring filtering efficiency of different devices and application |
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| CN202111677979.2A CN114371117A (en) | 2021-12-31 | 2021-12-31 | Multifunctional composite measuring system for measuring filtering efficiency of different devices and application |
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