Filter material for cleaning hot gases

 

The material includes two layers containing synthetic fibers and framed canvas located between these layers, all the layers are bonded together by hypoproteinemia and saturated aqueous dispersion based on vermiculite and adhesive to the weight of dry matter of 4-8 wt.%. The obtained heat-resistant filter material. 2 C.p. f-crystals, 1 Il.

The invention relates to filtration materials used for cleaning hot gases with temperatures up to 260oC.

Known non-woven filter material for cleaning hot gases with temperatures up to 170oS, consisting of the outer windshield and closing of the fibrous layers of polyester fibers and an intermediate frame of a cloth fastened together (see and.with. The USSR 850152, IPC B 01 D 39/16, 30.07.81 year). The disadvantage of this material is its relatively low heat resistance.

Also known nonwoven filter material for cleaning hot gases with temperatures up to 220oWith, including two fibrous layer of synthetic fibers with intermediate frame canvas between them and the covering layer facing the flow of contaminated gas that sits on top of these layers and containing a metal hair is th heat resistance, which does not allow to use it for cleaning gases with a temperature range up to 230-260oC. in Addition, the known filter material involves the use of a limited range of products synthetic fibers, the resistance of which is higher than the temperature of the cleaned gas, which in some cases leads to a higher cost of the cleanup process.

The objective of the invention is to increase the heat resistance of the filter material capable of stable operation when cleaning hot gases with a temperature range up to 230-260oC.

This problem is solved due to the fact that the filter material, comprising two fibrous layer of synthetic fibers and framed canvas located between these layers, bonded together by hypoproteinemia impregnated composition based on an aqueous dispersion of vermiculite and adhesive to the weight of dry matter of 4-8 wt.%, as the adhesive used is sodium silicate, and one of the outer surfaces of the material are made smooth.

The fibrous layers may be made of polypropylene or polyester fibers.

The invention is illustrated in the drawing and the following description.

The figure schematically presents a cross soybean leaf 2 located between layers 1 and 3, bonded together by beams 4 fibers, formed on the basis of when hypoproteinemia.

Material saturated aqueous dispersion based on vermiculite and adhesive to the weight of dry matter of 4-8 wt.%. Particles 5 vermiculite, fixed by adhesive, distributed in the material structure. One of the outer surfaces 6 are made smooth.

The material is produced as follows. Fibrous layer 1 are sequentially laid on him the framed canvas 2 and the second fibrous layer 3 is subjected to hypoproteinemia on needle machine, which are formed beams 4 fibers, crimping between the fibrous layers 1, 3 and frame 2. The resulting intermediate product is impregnated with the aqueous dispersion of vermiculite and adhesive, which is used as sodium silicate. After impregnation carry out the drying of the material. The weight on the dry substance is 4-8 wt. %.

The smoothness of the outer surface 6 of the material give, for example, processing on the calender.

Particles 5 dispersed and fixed with adhesive into the fibrous layers 1, 3 and frame the canvas 2, have a high ability to reflect heat energy of cleaned hot gas stream, which significantly increases dermotocosmetolgy in the range up to 230-260oC. Often heated gases are corrosive acidic and alkaline environment, such as waste gases during sublimation from drying in the production of chalk, alumina production, chemical plants, etc. At temperatures of heated gases up to 230oIn these cases, it is preferred to use fibrous layers 1 polypropylene fibers. The content of the impregnating composition based on vermiculite and adhesive on the dry substance is 4-5% to the total mass of the material. At higher temperatures (240-260oC), for example, when cleaning of exhaust gases from heating systems, drying in the production of asphalt-concrete pavement, cement plants, etc. is preferable to use polyester fiber. The content of the impregnating composition based on vermiculite and adhesive on the dry substance is 4-5% to the total mass of the material. Framed canvas 2 is carried out predominantly of polyester filament yarn.

During operation of the filter material to its smooth outer surface 4 facing the flow of the purified gas.

Thanks to this construction with the outer surface prevents clogging of the material structure of polluting particles, facilitated its regeneration.

2. The filter material under item 1, wherein the fibrous layers are made of polyester fibers.

3. The filter material under item 1, wherein the fibrous layers are made of polypropylene fibers.

 

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The invention relates to filters, filter design, the materials used in the construction of filters and filtering methods

FIELD: methods of production of electret items, electret filters and respirators.

SUBSTANCE: the invention presents a method of production of electret items, electret filters and respirators with heightened resistivity to the oil mist. The invention falls into production processes of electret items, electret packed beds and respirators, and may be used for removal of corpuscles from gases, especially for removal of aerosols from air. The method provides for: formation of a melted material consisting of a mixture of a polymer composed of a mixture of a polymer representing a non-current-conducting thermoplastic resin with a specific resistivity exceeding 1014 Ohms·cm with a fluorine compound as an additive compound; shaping it to the required form and quenching it up to the temperature lower than the melting point of the polymer. The material is calcined and treated with an electric charge to give it electret properties. The invention improves the capability of filtering oily aerosols.

EFFECT: the invention improves the capability of filtering oily aerosols.

19 cl, 16 tbl, 19 dwg, 23 ex

FIELD: methods for imparting charge to fibrous webs by means of non-aqueous liquid for usage of said webs as filters in filtering face masks for protection of user's mouth and nose.

SUBSTANCE: method involves wetting web formed from non-conductive fibers with non-aqueous polar liquid; substantially drying web for producing fibrous electronic web. Method differs from known methods of imparting charge to web in that it requires less energy for drying of web than methods using aqueous liquids. Also, many kinds of filaments poorly wetted with aqueous liquids are immediately wetted with non-aqueous liquids.

EFFECT: increased efficiency and simplified method.

12 cl, 2 dwg, 6 tbl, 26 ex

FIELD: fine-fiber filtering materials.

SUBSTANCE: the invention is pertinent to fine-fiber filtering materials used for individual means of protection of respiratory organs. The invention offers a protection material, a means of protection containing the offered material and a method of production of the fibrous material providing for electrostatic forming of the fibrous material from a solution of styrene copolymer with acrylonitrile in an organic solvent at the presence of electrostatic additives of bromide or iodide salts of tetraethyl- or tetrabutyl-ammonium. At that a solution containing an additive of a high-molecular methylmethacrylate in amount of 0.001-0.01 mass % in the capacity of dissolvent is used a mixture of ethyl acetate with butyl acetate at their mass ratio in the solution from 1/9 up to 9/1 accordingly. The invention allows to produce a material with improved mechanical characteristics and to provide stability of the production process.

EFFECT: the invention ensures production of the material with improved mechanical characteristics and stability of the production process.

5 cl, 2 tbl, 1 ex

FIELD: fine filtration of air; cleaning ventilation emissions from oil mist; cleaning air in venting pipe lines of gas-transfer unit oil tanks.

SUBSTANCE: proposed filter includes filter element with filter medium made from coarse and fine fibers laid in between outer and inner cylinders, cover and bottom. Filter medium is made from longitudinal and transversal oil-resistant synthetic (polypropylene) fibers; ratio of mass of longitudinal and transversal fibers is equal to (6-8) : 1 and ratio of diameters of thin and coarse fibers is equal to (0.5-1) : 10.

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SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.

EFFECT: enhanced strength.

1 dwg, 1 tbl

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EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.

1 tbl

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EFFECT: the invention ensures production of a fibrous electret linen, which may be efficiently used in the air filters, for example, in respirators.

13 cl, 3 ex, 5 tbl, 4 dwg

FIELD: chemical industry; oil refining industry and other industries.

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FIELD: methods of production of filtering materials.

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