RU65398U1 - AEROSOL FILTER - Google Patents

Abstract

The utility model relates to aerosol filters for the purification of process air in the radio-electronic, chemical, medical and biotechnological industries. The aerosol filter contains a housing, a fine filter block of an L- or M-shaped configuration, consisting of modules with folded filtering material based on glass paper with separation of folds by separators. The angle of rotation between the modules of the filter unit is at least 10 °. The filter housing is made of plywood (type D) or carbon steel (type A). Plywood casing and wooden structural filter elements are impregnated in three layers with the composition of Pirilax bio-pyrene. The utility model provides high efficiency air purification at low energy consumption.

Description

The utility model relates to the field of gaseous waste management in the nuclear industry, namely to the treatment equipment for collecting radioactive aerosols, and can be used in the electronic, chemical, medical and biotechnical industries.

Known aerosol filters with filtering material FP, which are widely used at the enterprises of Rosatom [TU 95 2314-98. Aerosol filters with filtering material FP; OST 95 4-80. Aerosol filters with filtering material FP; Aerosol filters with filtering material FP. Catalog]. The filter unit in them is a folded package of a panel type. Along with high technical indicators, FP filters have several disadvantages:

- low thermal stability of the filter material, during the combustion of which toxic substances are released. At the same time, according to the requirements of NP-021-2000, aerosol filters and materials used in their manufacture should not support combustion;

- reduced cleaning efficiency with increased moisture content of the cleaned medium and under the influence of ionizing radiation.

High-performance fireproof fine air filters of the PERA and ULPA type are known, where glass paper based on microfine fiberglass is used as filter material [Air Filters For Use At Nuclear Facilities // Technical Reports Series. - No. 122, International Atomic Energy Agency, Vienna. - 1970; Testing And Monitoring of Off-Gas Cleanup Systems At Nuclear Facilities // Technical Reports Series. - No. 243, International Atomic Energy Agency, Vienna. - 1984; Design And Operation Of Off-Gas Cleaning Systems And High Level Liquid Waste Conditioning Facilities // Technical Reports Series. - No. 291, International Atomic Energy Agency, Vienna. - 1988]. Filters, as a rule, are a folded package of glass paper, poured into the walls using sealant. Such a package, especially if it is large (600-1200 mm), has little stiffness, and even the presence of separators cannot significantly increase it. This disadvantage leads to significant deformation under the influence of air load and dead weight, which, in

in turn, is associated with the appearance of defects in the filter layer and self-dusting. The design of these filters prevents their use in the existing ventilation and gas purification systems of Rosatom enterprises without their modernization and reconstruction. The latter is associated with huge economic costs, because only one enterprise operates up to several thousand filter filters.

The above disadvantages are eliminated by the use of filters of the FAS and FAST types based on glass paper and polyester, developed in the dimensions of standard filters of the FP type D-23, A-17 and D-9 [Nuclear and radiation safety of Russia // Newsletter. - Issue 2 (5), M. - 2005. - p. 22-35; RF patent No. 2200615]. They differ from FP filters in increased heat and moisture resistance, high cleaning efficiency in humid conditions, increased dust-bone, as well as incombustibility and fire safety. These glass paper filters also eliminate the disadvantage of HEPA and ULPA filters regarding the possibility of their installation in existing cleaning systems without additional alteration. However, only three analogs to the FP filters have been developed, which is extremely insufficient to meet the needs of enterprises for refractory filters of all sizes. In addition, the filter volume is not fully used to increase the filtration area of the fine stage, because the design incorporates filtering panels of the panel type.

Filters of the FAS and FAST types are manufactured in two versions, one-stage and two-stage. The advantage of two-stage filters [RF Patent No. 2200615] regarding the presence of a pre-treatment section in the conditions of reactor, radiochemical and chemical-technological production, as a rule, is not required due to the low weight concentration of aerosols, i.e. the filter volume occupied by the prefilter can also be used for the fine filter block.

The closest analogue is the design of the filter FAS-3000 [Nuclear and Radiation Safety of Russia // Newsletter. - Issue 2 (5), M. - 2005. - p.22-35]. The aerosol filter consists of a wooden case and a panel-type filtering unit, which is a folded package of glass paper with separation of folds by separators. The filter unit is connected to the walls of the housing using sealant. The main disadvantage of the prototype is

low utilization of the filter housing volume due to the use of a panel-type filtering unit.

The objective of the technical solution is to increase the utilization rate of the volume of a glass paper filter of the FAS type by increasing the useful filtering area of the fine air purification stage, as well as providing Rosatom's production with refractory filters of the main standard sizes in the dimensions of the FP filters, allowing their use without alteration in standard ventilation systems.

The problem is solved by changing the design of the filtering unit of the panel type to an L- or M-shaped configuration (FTOV-SBM filters). As components of the filtering block, modules with folded filtering material based on glass paper with separation of folds by separators are used.

A schematic representation of the proposed designs of filters FTOV-SBM shown in figure 1 and figure 2. Figure 1 presents the L-shaped configuration of the filter block of the filter type D-13UM (drawing FTOV-SBM 100). Figure 2, for example, a filter of type D-28UM (drawing FTOV-SBM 300), shows the M-shaped configuration of the proposed filters.

The air flow enters the cavity of the housing and passes through the filtering surface of the modules 1 (figure 1) and 1, 2 (figure 2). The angle of rotation between the modules must be at least 10 °. The free space between the filter modules, as well as between the filter models and the inner walls of the filter housing, is the free space of the filter at the inlet 3 and the free space at the outlet 4. The free space at the air inlet expands in the opposite direction to the air flow and narrows in the direction of flow, and the free the outlet space expands in the direction of the air flow and narrows in the opposite direction to the flow, which improves the aerodynamic characteristics of the filter and distribution ix stream of air filter unit.

The types of the developed FTOV-SBM filters, the numbers of the drawings and the configuration of the filtering blocks in comparison with their analogues are shown in Table 1.

Table 1
Filter characteristics Type of filter FTOV-SBM The area of the filtering surface, m ² Drawing number Filter Block Configuration The standard analogue of the proposed filter Filter type The area of the filtering surface, m ² D-13UM 19.0 FTOV-SBM 100SB L-shaped D-13U 13.0 D-19M 22.0 FTOV-SBM 200SB L-shaped D-19 19.0 D-28UM 31,4 FTOV-SBM 300SB M-shaped D-28 28.0 D-12UM 20,0 FTOV-SBM 400SB L-shaped D-12U 12.0 D-6.5M 9.0 FTOV-SBM 500SB L-shaped D-6.5 6.5 A-5.3M 8.0 FTOV-SBM 800SB L-shaped A-5.3 5.3 D-13.5UM 22.4 FTOV-SBM 900SB L-shaped D-13.5U 13.5 D-14UM 14.0 FTOV-SBM 1000SB M-shaped D-14U 14.0 D-15UM 23.0 FTOV-SBM 1100SB L-shaped D-15U 15.0 D-23M 30,0 FTOV-SBM 1200SB M-shaped D-23 23.0 FAS-3000 23.0 D-33M 41.2 FTOV-SBM 1300SB M-shaped D-33 33.0 A-17M 30,0 FTOV-SBM 1400SB M-shaped A-17 17.0 FAST-2000 17.0

Filter housings can be made of plywood (type D) or carbon steel (type A). To transfer to the first group of fire-retardant efficiency, plywood cases and wooden structural elements of FTOV-SBM filters are impregnated in three layers with the composition of Pirilax biopiren [TU 2499-021-24505934-03. Biofire (flame retardant-antiseptic) Pirilax 3000.].

The results of acceptance tests of FTOV-SBM filters based on glass paper manufactured at FSUE Mayak PA are presented in Table 2.

table 2
Results of acceptance tests of FTOV-SBM filters Type of filter FTOV-SBM The cleaning efficiency,% Breakthrough Ratio,% Aerodynamic drag, Pa D-6.5M 99,970 0,030 80 D-6.5M 99,980 0,020 120 D-12UM 99,980 0,020 one hundred D-12UM 99,970 0,030 one hundred D-13UM 99,992 0.008 110 D-13UM 99,980 0,020 one hundred

D-19M 99,994 0.006 200 D-19M 99,997 0.003 180 D-28UM 99,980 0,020 160 Notes
1 The cleaning efficiency of the prototype is 99.95%
2. The cleaning efficiency was measured at a filtration rate of 1 cm / s

Thanks to this technical solution, the filtration area is significantly increased, the nominal filter performance is increased or energy costs (aerodynamic drag, etc.) are reduced at the same performance.

Claims (5)

1. Aerosol filter, consisting of a housing, a fine filtering unit based on glass paper, laid in folds with separators placed between the folds, characterized in that the filtering unit is made in the form of an L- or M-shaped configuration. 2. The aerosol filter according to claim 1, characterized in that the filter housing is made of plywood impregnated in three layers with the composition of the pyrilax bio-pyrene. 3. The aerosol filter according to claim 1, characterized in that the filter contains wooden elements impregnated in three layers with the composition of the pyrilax bio-pyrene. 4. The aerosol filter according to claim 1, characterized in that the filter housing is made of carbon steel. 5. The aerosol filter according to claim 1, characterized in that the angle of rotation between the modules of the filter unit is at least 10 °.