PL166946B1 - Filtering membrane for use in equipment separating dust from hot gases - Google Patents

Abstract

Filter screen for dedusting hot gases, layered, characterized in that it has a share 30-60% fleece of homogeneous glass fibers or mixed, glass fabric 25-50% fiber glass and 15-20% of a coating composition containing 5-80% fluoropolymers and phosphates organic or inorganic phosphates in quantity 0.1-50% and mineral fillers in the amount 1-60%, in four layers (1, 2, 3, 4), wherein the first layer (1) is the composition layer coating, the second layer (2) is a layer fleece of glass fibers, and the third layer (3) is a glass fiber backing fabric, and the fourth layer (4) is the composition layer the coating and the second layer (2) with the layer the third (3) are connected by needling and the layer the first (1) with the second (2) and the fourth layer (4) they are connected with the third layer (3) by adhesive forces, being a mineral filler for the composition metal oxides and hydroxides are used in the coating alkaline earth or oxides, and hydroxides of the group boron in the amount of 1.0-55.0%, or alkali metal silicates or quaternary ammonium silicates, or salts of silicic acid in an amount of 0.7-60%.

Description

The subject of the invention is a filter baffle for dedusting hot gases.

Needled felt made of glass fibers is known, which is made of glass fibers and the backing fabric also of glass fibers of multyfilament. Thin glass fibers less than 5 microns in thickness are needled on a fabric support and bonded with temperature, humidity, acid and alkali resistant agents that provide abrasion and friction resistance, and provide flexibility of the product and tear strength of the material. The chemicals used are resistant to a temperature of 260 ° C continuously and a temperature of 290 ° C intermittently.

The filtration screen for dedusting hot gases according to the invention is layered with 30-60% fleece of homogeneous or mixed glass fibers, 25-50% glass fabric of homogeneous or mixed glass fibers, 25-50% glass fabric of glass fibers and a coating composition 15 -20% containing fluoropolymers in an amount

5-80% and organic phosphates or inorganic phosphates in the amount of 0.1-50% and mineral fillers in the amount of 1-50% and mineral fillers in the amount of 1.0-60%.

The hot gas dedusting filter screen is further constructed of four layers, the first layer of which is the coating composition layer, the second layer is the glass fiber fleece layer. The third layer is a glass fiber backing fabric and the fourth layer is a layer of the coating composition. The second layer is connected with the third layer by needling, while the first layer with the second layer and the third layer with the fourth layer are connected by adhesive forces.

Alkaline earth metal oxides and hydroxides or oxides and hydroxides of the boron group in an amount of 1.0-55% are used as mineral fillers in the coating compositions. Alkali metal silicates or quaternary ammonium silicates or silicic acid salts in an amount of 0.7-60% are also used.

The filtering partition for dedusting hot gases according to the invention has heat-resistant and chemically-resistant properties, thanks to the use of glass fibers and a layer of a coating composition made of fluoropolymers such as: polytetrafluoroethylene, polytrifluorochloroethylene with the addition of alkali metal silicates, quaternary ammonium silicates, as well as organic and inorganic phosphate salts. Filter partition

166,946 parts by weight; parts by weight; parts by weight;

parts by weight; parts by weight.

parts by weight, parts by weight, characterized by non-flammability, flexibility, resistance to friction, can be packaged in any form.

The subject of the invention is shown in the embodiment in the attached drawing, which shows the filter barrier in a cross-section showing a layer structure.

The hot gas dedusting filter screen is made up of four layers 1, 2, 3 and 4 and is made according to the examples.

Example I. A fleece deck constituting 50% of the total surface weight of the product, containing 100% homogeneous waste glass fibers with a thickness of 6 pm, prepared by mechanical fleece forming and initial needle punching, was combined in the process of actual needling with a 9 pm thick glass fabric washer 0 plain weave, constituting 30% of the total weight of the product. The obtained intermediate is impregnated with a coating composition having the following composition:

- 60% fluoropolymer dispersions with grain size below 5 pm - 4

- aluminum phosphate in the form of an aqueous suspension of 14% - 8

- aluminum hydroxide - 2

- colloidal silicic acid solution with 30% silica content - 6

- water - 38

The product was dried at 120 ° C to a constant weight, obtaining a 20% application of the dry weight of the coating composition in relation to the weight of the finished product, and then colandered at 180-200 ° C. The obtained material is characterized by high physical-mechanical and filtration parameters.

An example. The fleece backing, constituting 40% of the total surface weight of the product, containing 50% of waste glass fibers with a thickness of 6 μm and 50% of waste glass fibers, with a thickness of 9 μm, prepared by mechanical fleece formation and initial needling, is combined in the process of actual needling with a glass fabric washer with a Gauze weave constituting 35% of the total weight of the product.

The obtained semi-finished product is impregnated with a coating composition having the following composition:

- 60% fluoropolymer dispersion;

with grain size below 5 pm - 8 parts by weight,

- aluminum phosphate - 10

- water - 30

The product is dried at 120 ° C to a constant weight, obtaining 25% dry matter application in relation to the weight of the finished product, and then calendered at 200 ° C, obtaining the required physical, mechanical and filtration parameters of the product.

Example III. The fleece deck, constituting 30% of the total surface weight - the product containing 100% homogeneous waste glass fibers with a thickness of 6 µm is prepared by the aerodynamic fleece forming process, and is joined by needling from a glass fabric with a linen weave and representing 55% of the product weight.

The obtained semi-finished product is impregnated with a coating composition having the following composition:

- 60% fluoropolymer dispersion - 5

- aluminum phosphate 14% - 8

- cyclic hydroxide -1.5

- aqueous sodium silicate solution - 8

- water - 40

The product was dried at 130 ° C to constant weight, obtaining a 15% application of the dry substance of the agent, and then calendered at 180-200 ° C.

parts by weight, parts by weight, parts by weight, parts by weight, parts

166 946

Publishing Department of the UP RP. Circulation of 90 copies

Price PLN 1,100.

Claims (1)

Patent claim Layered filtering barrier for dedusting hot gases, characterized by a fleece of 30-60% of homogeneous or mixed glass fibers, glass fabric of 25-50% of glass fibers and 15-20% of a coating composition containing 5-80% fluoropolymers % and organic phosphates or inorganic phosphates in the amount of 0.1-50% and mineral fillers in the amount of 1-60%, for four layers (1, 2, 3, 4), where the first layer (1) is the layer of the coating composition , the second layer (2) is a glass fiber fleece layer, and the third layer (3) is a glass fiber backing fabric, and the fourth layer (4) is a coating composition layer, and the second layer (2) is bonded to the third layer (3) are needling, and the first layer (1) with the second layer (2) and the fourth layer (4) with the third layer (3) are bonded by adhesive forces, the mineral filler of the coating composition using alkaline earth metal oxides and hydroxides or an oxide and, and boron hydroxides in an amount of 1.0-55.0%, or alkali metal silicates or quaternary ammonium silicates, or silicic acid salts in an amount of 0.7-60%.