CN113117432A - Fire-resistant and radiation-resistant metal fiber filter - Google Patents
Fire-resistant and radiation-resistant metal fiber filter Download PDFInfo
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- CN113117432A CN113117432A CN202110403432.7A CN202110403432A CN113117432A CN 113117432 A CN113117432 A CN 113117432A CN 202110403432 A CN202110403432 A CN 202110403432A CN 113117432 A CN113117432 A CN 113117432A
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- 239000000835 fiber Substances 0.000 title claims abstract description 52
- 239000002184 metal Substances 0.000 title claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 47
- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 10
- 230000005855 radiation Effects 0.000 title claims description 10
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000011045 prefiltration Methods 0.000 claims abstract description 22
- 230000002285 radioactive effect Effects 0.000 claims abstract description 14
- 239000000443 aerosol Substances 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 6
- 239000004071 soot Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 24
- 238000009423 ventilation Methods 0.000 abstract description 13
- 239000000428 dust Substances 0.000 abstract description 11
- 230000001681 protective effect Effects 0.000 abstract description 9
- 239000002915 spent fuel radioactive waste Substances 0.000 abstract description 6
- 239000000779 smoke Substances 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- 239000000919 ceramic Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 239000003365 glass fiber Substances 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003904 radioactive pollution Methods 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
- B01D46/64—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series arranged concentrically or coaxially
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Geometry (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention provides a fire-resistant and irradiation-resistant metal fiber filter, which comprises a filter element body, an upper sealing section and a lower sealing section which are arranged at the upper end and the lower end of the filter element body, a sealing end cover which is arranged at the upper end of the upper sealing section through a sealing gasket, and a filter base which is arranged at the lower end of the lower sealing section, wherein the filter element body comprises an outer layer protective net, an inner layer protective net, a pre-filter and a fine filter, and the two-stage combined filter realizes the efficient removal of submicron to millimeter-grade carbon smoke radioactive aerosol. The invention provides a novel fire-resistant and irradiation-resistant metal fiber filter, which mainly comprises a combined pre-filter, a pleated fine filter and accessory parts, wherein the filter is integrally arranged in a compact and integrated manner, has the advantages of high filtering efficiency, small flow resistance, large dust holding capacity, temperature resistance, irradiation resistance and the like, and can be used for ventilation and filtration of radioactive gas in spent fuel post-treatment plants and other nuclear facilities under the fire hazard condition.
Description
Technical Field
The invention relates to a fire-resistant and irradiation-resistant metal fiber filter, which is mainly used for ventilation and filtration of radioactive gas under the condition of fire hazard of nuclear facilities, and effectively prevents further spread of fire, and can also be used for filtration of gas under other radioactive irradiation environments of the nuclear facilities.
Background
The spent fuel post-treatment is a key step for realizing the closed cycle of nuclear fuel, can fully utilize uranium resources, safely and properly manage radioactive wastes, and has important significance for the sustainable development of nuclear energy. The spent fuel contains a large amount of radioactive fission products, in order to ensure that workers are prevented from radioactive damage and avoid radioactive pollution to the environment, a ventilation and purification system is reasonably designed according to the actual process environment in a post-treatment plant, and radioactive substances possibly existing in the plant area are purified and filtered. The design of the ventilation and purification system takes into account, on the one hand, the filtering function under normal operating conditions and, on the other hand, the suitability of the system in the event of a fire. The newly released safety requirement of spent fuel post-treatment facilities of the ministry of environmental protection puts forward a definite requirement on the function of a ventilation system under the condition of fire, and the research and the design of ventilation purification equipment with fire resistance have important significance for improving the survival capability of the system under special environment.
Referring to EJ/T938-95 design rules for ventilation and air purification of nuclear fuel reprocessing plants and GB/T17939-2008 high-efficiency air filters, the existing high-efficiency nuclear filters are mainly folded glass fiber filters, and are characterized in that the folded glass fiber filters are made of superfine glass fiber filter paper, and the following defects are mainly existed from the current use experience: (1) the filter paper has poor structural strength and is easy to damage during manufacturing and installation; (2) the dust holding capacity is low, and the filter is frequently replaced particularly when the initial resistance of 2.5 times is used as the final resistance standard; (3) the initial resistance of the material is large, and the requirements on the structure of the filter and the fan are high. In addition, the upper limit of temperature resistance of the glass fiber is 260 ℃, the smoke temperature under the fire disaster condition can be as high as 800 ℃, the glass fiber is likely to be melted at the moment, the filtering capability of radioactive substances is completely lost, and clear requirements are provided for the design of a ventilation system in a trial run edition of spent fuel post-processing facility safety requirement newly issued by the ministry of environmental protection: the design and control of the ventilation system can realize the aim of preventing and relieving the fire consequences, and the dynamic sealing system is kept as long as possible, the last stage of filtration is protected, and meanwhile, the fire spreading is limited, so that the development of the novel fire-resistant filter material is vital to the guarantee of the filtration efficiency of the ventilation and purification system under the fire condition, and even the safety of the whole factory building. In recent years, high-temperature resistant filter materials are rapidly developed, filter materials made of different materials including PPS fibers, polyimide fibers (P84), polytetrafluoroethylene fibers, polyvinylidene fluoride membranes, ceramic materials, metal materials and the like are developed, and only the ceramic materials and the metal materials in the novel filter materials can meet the use requirement of ultrahigh temperature (higher than 450 ℃).
The traditional ceramic filter material is formed by sintering ceramic powder, has high filtering precision, poor air permeability and large resistance, develops a ceramic fiber filter material with high porosity and high air permeability coefficient in recent years, is mainly applied to the aspect of high-temperature flue gas filtration, and has the advantages of excellent thermal stability and chemical stability, high working temperature of 1000 ℃, large specific surface area of the ceramic fiber filter material and good filtering effect. Compared with foamed ceramic, the filter has smaller pore size and higher filtering precision. Research shows that the ceramic fiber filter has high dust removal efficiency which can reach over 99 percent. However, the resistance of the ceramic fiber filter is still higher than that of the common fiber filter, the dust holding capacity is limited under the same driving force condition, and the ductility and the toughness are poor, so that the ceramic fiber filter is difficult to be integrally sealed with a system.
The metal filter material mainly comprises sintered metal powder and a sintered metal fiber felt, wherein the sintered metal powder material is formed by sintering metal powder, and has relatively high filter precision, poor permeability and relatively high resistance; sintered metal fiber mats are typically made of 316L stainless steel or FeCrAl alloy materials, which have a much higher permeability coefficient than powder materials. Compared with ceramic materials, the metal fibers have good plasticity, the structural shape can be changed at will according to requirements, and the filter material substrate is made of metal materials such as 316L and the like, so that the sealing problem under the high-temperature condition of fire can be solved by adopting a conventional welding process. The metal fiber filter has excellent temperature resistance, the melting point of 316L stainless steel is 1400 ℃, and the metal fiber filter can bear relatively high thermal expansion at high temperature without smoke leakage. Besides, the metal fiber filter material also has good acid-base corrosion resistance, radioactive radiation resistance and moisture resistance, and the filter can be repeatedly washed by the solution after reaching the final resistance, so that the recycling of the filter is realized, and the economic efficiency of the equipment is improved while the use requirement is met.
Disclosure of Invention
The invention relates to a fire-resistant and irradiation-resistant metal fiber filter, which is mainly used for ventilation and filtration of radioactive gas under the condition of fire hazard of nuclear facilities, and effectively prevents further spread of fire, and can also be used for filtration of gas under other radioactive irradiation environments of the nuclear facilities.
The purpose of the invention is realized as follows: including filter core body 1.3 ~ 1.6, the last canned paragraph and the lower canned paragraph 1.7 of both ends about setting up filter core body, 1.8, set up the end cover in last canned paragraph upper end through sealed the pad, the filter base 1.9 of setting at lower canned paragraph lower extreme, filter core body includes outer protecting wire net 1.3, inlayer protecting wire net 1.4, prefilter 1.5 and fine filter 1.6, two-stage combined filter realizes getting rid of submicron to millimeter level soot class radioactive aerosol high efficiency.
The invention also includes such structural features:
1. the outer layer protection net 1.3 is a porous structure formed by stainless steel sintered wire meshes with the aperture of a submillimeter level, the inner layer protection net 1.4 is a supporting structure formed by stainless steel punched plates, the prefilter 1.5 is a combined filter formed by multiple layers of fluffy metal fibers, the fine filter 1.6 is a high-efficiency filter formed by sintered metal fibers, and the filter adopts a triangular pleated structure.
2. The upper end and the lower end of the fine filter 1.6 are respectively fixed with the upper sealing section 1.7 and the lower sealing section 1.8 by welding.
3. The filter base 1.9 is of a circular metal trough structure.
4. The filter base 1.9 is of a circular metal trough structure.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a novel fire-resistant and irradiation-resistant metal fiber filter, which mainly comprises a combined pre-filter, a pleated fine filter and accessory parts, wherein the filter is integrally arranged in a compact and integrated manner, has the advantages of high filtering efficiency, small flow resistance, large dust holding capacity, temperature resistance, irradiation resistance and the like, and can be used for ventilation and filtration of radioactive gas in spent fuel post-treatment plants and other nuclear facilities under the fire hazard condition. The filter disclosed by the invention is temperature-resistant and irradiation-resistant, and can continuously and reliably operate in a fire superimposed strong radioactivity irradiation environment. The invention has simple structure, compact layout and small occupied space. The filter provided by the invention adopts an optimized design, and has the advantages of small flow resistance, high filtering efficiency and strong dust holding capacity.
Drawings
Fig. 1 is a schematic structural diagram of a refractory and radiation-resistant metal fiber filter.
Fig. 2 is a filter element structure of a refractory and radiation-resistant metal fiber filter.
Fig. 3 is a top view of a refractory, radiation resistant metal fiber filter cartridge.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
With reference to fig. 1 to 3, the filter of the present invention mainly comprises a sealing end cover 1.1, a sealing gasket 1.2, filter element bodies 1.3 to 1.6, upper and lower sealing sections 1.7 and 1.8 of the filter, a filter base 1.9, and the like.
The sealing end cover 1.1 is a detachable disc-shaped sealing structure positioned at the top of the filter, is connected with the filter element body by adopting a bolt structure, has the functions of mainly installing and replacing the filter element and simultaneously preventing gas leakage in the using process of the filter. In the filter element installation and the change process, end cover 1.1 can be dismantled, seal again after the installation is accomplished with the change, and this end cover structure can prevent effectively that gas from leaking from the top, and then causes the breakdown of filter to become invalid. The sealing gasket 1.2 is a graphite gasket structure, is mainly used for sealing between the sealing end cover 1.1 and the filter body, has the advantages of temperature resistance, irradiation resistance and the like, and can keep stable sealing effect in fire and radioactive environments. Filter core body 1.3 ~ 1.6 several parts such as outer protection network 1.3, inlayer protection network 1.4, prefilter 1.5 and smart filter 1.6 have been contained, two-stage combination formula filter can realize getting rid of submicron to millimeter level carbon smoke class radioactive aerosol high efficiency. The outer protective net 1.3 is a porous structure formed by stainless steel sintered wire meshes with the sub-millimeter-scale pore diameter, and the structure is positioned at the outermost periphery of the whole filter, so that on one hand, mechanical support is provided for the prefilter 1.5, the filter is ensured to have enough structural strength, on the other hand, a first-stage filter layer of the filter is also formed, and large-size carbon smoke floccules in ventilation gas are primarily filtered in a physical interception mode, so that the filter is prevented from being blocked at the initial starting stage; the inner layer protective net 1.4 is a supporting structure formed by stainless steel punched plates, the structure is located at the innermost side of the whole filter and is mainly used for supporting the fine filter and preventing the pleat structure of the fine filter from deforming in the flowing process of carrier gas.
The prefilter 1.5 is a combination filter made of multiple layers of bulky metal fibers, which may be in the form of an annular wave-like protrusion structure. The fluffy metal fiber has the remarkable characteristics of large porosity, loose structure and the like, can realize larger dust holding capacity under the condition of small flow resistance, and the prefilter formed by the fluffy metal fiber is mainly used for removing micron-sized aerosol, so that the dust holding load of the fine filter 1.6 is reduced as much as possible, and the continuous operation time of the filter is prolonged without exceeding the maximum resistance. The prefilter 1.5 has the advantages of large dust holding capacity, small resistance and the like, the number and arrangement of fiber layers are smoothly designed by adopting an optimization algorithm, the optimal matching of the filtering efficiency, the flow resistance and the dust holding characteristic is ensured, the prefilter adopts a large-size circular arc-shaped pleat structure, and the flow area is expanded to the maximum extent, so that the apparent air velocity is reduced, the filtering efficiency is increased, and the flow resistance is reduced. The fine filter 1.6 is a high-efficiency filter composed of sintered metal fibers, the filter adopts a triangular pleat structure, and the pleat spacing and pleat depth adopt optimized designs, so that the optimal flow distribution characteristic can be ensured, the uniform flow distribution of the filter under the condition of as low apparent gas velocity as possible can be ensured, and higher filtering efficiency and lower flow resistance can be further ensured. The upper and lower sealing sections 1.7 and 1.8 of the filter are characterized in that the upper and lower ends of the filter are fixed and sealed by resistance welding, and the sealing requirement under the high-temperature condition can be met. The filter base 1.9 is of a circular metal groove type structure, the metal groove is manufactured through mechanical finish machining, integral support is provided for the filter, and meanwhile the circular metal groove also forms a bottom air outlet channel of the filter. The fire-resistant type metal fiber filter adopts compact integration to arrange, and overall structure temperature resistant is able to bear or endure irradiation, and the space volume that just occupies is less, can also carry out the nimble change in combination scheme and the structural style according to actual engineering demand, the engineering practical application of being convenient for.
In order to achieve the aim, the combination scheme of the prefilter 1.5 is designed by adopting an optimization algorithm, equations (1) and (2) respectively show the prediction correlation of the single-layer metal fiber filter material on the filtering efficiency and the flow resistance of aerosol, and as can be seen from the equations, the metal fiber filtering performance is mainly related to the porosity, the fiber filament diameter and the fiber thickness of the fiber filter material, so that the combination scheme of the prefilter 1.5 is optimized in the combination scheme optimization process of the fiber filter material with various structures such as the filament diameters of 2 microns, 4 microns, 6 microns, 8 microns, 12 microns, 20 microns and the like.
Because the fiber filter material structure parameters of each structure are different, the filtering performance is greatly different, hundreds or even thousands of corresponding combination schemes exist, in order to screen out the optimal combination scheme according to the actual engineering requirements, a combination optimization algorithm shown in a formula (3) is adopted to carry out exhaustive analysis on all the permutation and combination schemes, and the combination scheme with the optimal efficiency, resistance and dust holding performance is finally obtained by carrying out step-by-step screening according to the optimization judgment criterion.
The fine filter 1.6 is a high-efficiency filter made of sintered metal fibers, and the gas to be filtered enters the filter from the side surface along the radial direction and flows out downwards along the central axis. The fine filter is of a triangular pleat structure and forms a circular ring structure, the pleat corners are transited through arcs, and the pleat spacing and the pleat depth are optimally designed by adopting a numerical simulation algorithm, so that the gas can be ensured to have the optimal flow distribution characteristic between the pleat corners, the uniform flow distribution of the filter under the condition of the lowest apparent gas velocity can be ensured, and the higher filtering efficiency and the lower flow resistance can be further ensured. The upper and lower boundaries of the fine filter 1.6 are respectively matched with the upper and lower sealing sections 1.7 and 1.8 of the filter, so that gas is prevented from leaking from the sealing surface and further radioactivity can not be controlled and released, the characteristics of high temperature and high radioactivity of the gas are considered, the upper and lower ends of the filter are fixed and sealed by the sealing sections through resistance welding, short plates which are not resistant to high temperature of the traditional sealant are made up, and the sealing requirement under the high-temperature condition can be met. The filter and the sealing section are integrally fixed on a base 1.9, the base 1.9 is a circular metal groove which is manufactured by mechanical finish machining and provides integral support for the filter, and the circular metal groove also forms a bottom air outlet channel of the filter and is connected with a carrier gas system channel. The pre-filter 1.5, the fine filter 1.6 and the internal and external protective nets are integrally arranged, so that the structure is compact, the space volume is small, and the arrangement can be flexibly carried out according to the actual requirements on the site.
The filter is generally of a cylindrical structure and is coaxially and symmetrically arranged from outside to inside, the outer protective net 1.3 and the inner protective net 1.4 are respectively positioned at the outermost periphery and the innermost side of the filter and are fixed on the filter base 1.9 in a welding mode, the structural framework of the filter is mainly formed, and meanwhile, mechanical support is provided for the pre-filter 1.5 and the fine filter 1.6. The outer surface of the prefilter 1.5 is in contact with the inner surface of the outer protective net 1.3, and the inner surface of the prefilter 1.5 is in contact with the outer surface of the fine filter 1.6. The prefilter 1.5 is made by combining and superposing a plurality of layers of fluffy fibers, the combined fiber layers are in direct contact with each other and are sealed and fixed by utilizing upper and lower sealing sections 1.7 and 1.8, and the prefilter 1.5 adopts a large-size circular arc-shaped pleat structure to expand the flow area to the maximum extent. The fine filter 1.6 is formed by rolling and folding sintered metal fibers with specific porosity and fiber wire diameter, the peripheral fold corner tip part is in contact with the inner surface of the pre-filter 1.5, the inner fold corner tip part is in contact with the inner-layer protective net 1.4, and the fold corners, the fold depths and the circular arc sizes of the fold corners of the fine filter 1.6 are optimally designed, so that the optimal flow distribution characteristic and the minimum flow resistance can be ensured. The upper end and the lower end of the fine filter 1.6 are respectively welded and fixed with the upper sealing section 1.7 and the lower sealing section 1.8, so that the structural stability and the sealing property under the ultrahigh-temperature condition are fully ensured.
The filter top is open pore structure, because the initial installation of filter core and the change of filter core, in order to prevent that operation in-process gas from leaking from the top, the design of filter top has sealing end cover 1.1 to utilize sealed 1.2 and the filter on sealed section 1.7 cooperate, through axial multiple spot buckle device, constitute the upper portion seal structure of filter. The filter is integrally placed on a filter base 1.9, the base is of a circular ring structure formed by precision machining, the upper portion of the base is connected with a lower sealing section 1.8 through mechanical matching, and a hollow portion forms an air outlet channel of clean air and can also be connected with an air outlet pipeline.
Claims (5)
1. A fire-resistant, resistant irradiation type metal fiber filter which characterized in that: including filter core body (1.3 ~ 1.6), the last canned paragraph and the lower canned paragraph (1.7, 1.8) of setting both ends about filter core body, set up the end cover in last canned paragraph upper end through sealed the pad, set up filter base (1.9) at the lower canned paragraph lower extreme, filter core body includes outer protecting wire net (1.3), inlayer protecting wire net (1.4), prefilter (1.5) and fine filter (1.6), two-stage combined filter realizes getting rid of submicron to millimeter level soot class radioactive aerosol high efficiency.
2. A refractory, radiation-resistant metal fiber filter in accordance with claim 1, wherein: the outer layer protection net (1.3) is a porous structure formed by stainless steel sintered wire meshes with the aperture of a submillimeter level, the inner layer protection net (1.4) is a supporting structure formed by stainless steel punched plates, the prefilter (1.5) is a combined filter formed by multiple layers of fluffy metal fibers, the fine filter (1.6) is a high-efficiency filter formed by sintered metal fibers, and the filter adopts a triangular pleated structure.
3. A refractory, radiation-resistant metal fiber filter according to claim 1 or 2, wherein: the upper end and the lower end of the fine filter (1.6) are respectively fixed with the upper sealing section and the lower sealing section (1.7 and 1.8) by welding.
4. A refractory, radiation-resistant metal fiber filter according to claim 1 or 2, wherein: the filter base (1.9) is of a circular metal groove structure.
5. A refractory, radiation-resistant metal fiber filter in accordance with claim 3, wherein: the filter base (1.9) is of a circular metal groove structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110403432.7A CN113117432A (en) | 2021-04-15 | 2021-04-15 | Fire-resistant and radiation-resistant metal fiber filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110403432.7A CN113117432A (en) | 2021-04-15 | 2021-04-15 | Fire-resistant and radiation-resistant metal fiber filter |
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| CN113117432A true CN113117432A (en) | 2021-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114832534A (en) * | 2022-03-21 | 2022-08-02 | 哈尔滨工程大学 | High temperature resistant type pit filter of modular design |
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