CN105013249B - Nitre and dioxin-removal PPS composite felt functional filtering material and preparation method thereof - Google Patents

Abstract

The invention provides a method for preparing a PPS composite felt functional filter material for denitrification and dioxin, comprising the following steps: (1) mixing active metal catalyst powder with PTFE resin powder to prepare PTFE fibers containing catalyst and catalyst-containing (2) the PTFE fibers containing the catalyst and the high-strength PTFE fibers are alternately arranged in 1-10:1-10 to make warp beams, and the PTFE base cloth layer is made by weaving; (3 ) Mix PPS fiber with PTFE short fiber containing catalyst and put it into needle punching machine together with PTFE base cloth layer to make PPS composite needle felt; (4) Mix active metal catalyst emulsion and PTFE emulsion to make catalyst mixed treatment (5) The sintered PPS composite needle felt and the PTFE microporous film containing the catalyst are introduced into the thermal laminating machine at the same time, and the surface Carry out hot press lamination processing. The invention can remarkably improve the filtration precision and the denitrification and dioxin efficiency.

Description

A PPS composite felt functional filter material for denitrification and dioxin and preparation method thereof

technical field

The invention relates to the field of environmental protection dust removal flue gas purification, in particular to a PPS composite felt functional filter material for denitrification and dioxin removal and a preparation method thereof.

Background technique

At present, with the rapid development of the economy, the emission of industrial waste gas has increased dramatically. The pollution of my country's atmospheric environment is becoming more and more serious, and it is gradually changing from soot pollution to mixed pollution. The total emissions of smoke, SOx, NOx, and Hg rank first in the world. Among them, nitrogen oxides and dioxins are one of the main pollutants in the atmosphere. The emission exceeds the self-purification capacity of the environment, causing great harm and the environmental situation is very severe. Nitrogen oxides and dioxins are the most important gaseous pollutants that affect air quality, and are important indicators to measure whether the atmosphere is polluted.

Coal-fired power plants and waste incineration plants are major emitters of SOx and NOx. The pollutants produced in the flue gas include sulfur oxides, nitrogen oxides, dust, inhalable particulate matter (IP), dioxins (PCDD/Fs), Hazardous substances such as heavy metals. At present, nitrogen oxides have gradually become the largest acid polluting gas. Nitrogen oxides combined with water in the air will eventually be converted into nitric acid and nitrates. Nitric acid is one of the causes of acid rain. It is combined with other pollutants under certain conditions. It can produce photochemical smog pollution, seriously pollute the environment and endanger human health. Dioxins are a class of organic pollutants with wide sources, strong toxicity and high stability. It is a general term for polychlorinated dibenzodioxins and polychlorinated dibenzofurans. There are 75 types of the former and 135 types of the latter, with a total of 210 homologues. Most of these compounds are strongly carcinogenic, teratogenic and mutagenic. Due to the stability and oil-soluble properties of dioxin, it is difficult to discharge once it enters the human body. If it accumulates for a long time, it will permanently damage the human body's immune system and disrupt the body's hormone secretion, causing serious harm to the human body.

The environmental problems caused by harmful substances such as nitrogen oxides and dioxins and the harm to human health are huge. Although various flue gas denitrification and dioxin removal processes have been researched and developed at home and abroad, each has its own characteristics and achieved certain results, but there is a problem of removal efficiency of harmful substances in common. Harmful substances such as nitrogen oxides and dioxins have a certain escape phenomenon.

Comprehensive consideration of environmental benefits and economic benefits will become the mainstream in the development of technologies for the prevention and control of harmful substances such as nitrogen oxides and dioxins in the future. In order to further improve the removal efficiency of harmful substances, through the research and development of new functional and environmentally friendly dust removal filter materials, active catalysts are implanted in the filter materials to achieve dust removal in high-temperature flue gas while removing nitrogen oxides and nitrogen oxides contained in high-temperature flue gas. The purpose of catalytic decomposition of toxic and harmful substances such as dioxins. Therefore, in the original environmental protection dust removal system, the catalytic decomposition of residual nitrogen oxides, dioxins and other harmful substances can be completed without changing the existing process equipment and working conditions.

Contents of the invention

The purpose of the present invention is to solve some problems existing in the existing denitrification and dioxin filter material technology, and provide a PPS composite felt functional filter material for denitrification and dioxin and a preparation method thereof.

The purpose of the present invention is achieved through the following technical solutions:

A preparation method of a PPS composite felt functional filter material for denitrification and dioxin, comprising the following steps:

(1) After the active metal catalyst powder is mixed with the PTFE resin, the PTFE fiber containing the catalyst and the PTFE microporous film containing the catalyst are made respectively;

(2) the PTFE fiber containing catalyst and the high-strength PTFE fiber adopt the mode of 1-10:1-10 to be arranged alternately to make warp beam, adopt the mode of weaving to weave and make PTFE base cloth layer;

(3) PPS fibers are mixed with short PTFE fibers containing catalysts and put into the needle punching machine together with the PTFE base cloth layer to form PPS+catalyzed PTFE fiber strength layers on both sides of the PTFE base cloth layer to make PPS composite needle felt ;

(4) Mix the active metal catalyst emulsion with the PTFE emulsion to make a catalyst mixed treatment solution, and perform overall impregnation treatment on the PPS composite needle felt, and then sinter at 280-350°C;

(5) The sintered PPS composite needle-punched felt and the PTFE microporous film containing the catalyst are simultaneously introduced into the hot-coating machine, and the surface is subjected to hot-press coating.

Preferably, the active metal catalyst in the step (1) is selected from one or more of V ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ .

Preferably, the mass ratio of the active metal catalyst powder to the PTFE resin powder in the step (1) is 1-10:99-90.

Preferably, the ratio of PPS fibers to catalyst-containing short PTFE fibers in the step (3) is 1-99:99-1.

Preferably, the mass ratio of the active metal catalyst emulsion to the active ingredient of the PTFE emulsion in the step (4) is 1-99:99-1.

Preferably, the solid content of the PTFE emulsion is 30-50%.

Preferably, the active ingredient of the active metal catalyst emulsion is one or more of V ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ .

Preferably, the solid content of the active metal catalyst emulsion is 40-60%.

The PPS composite felt functional filter material for denitrification and dioxin prepared according to the above method, sequentially includes a PTFE microporous film layer containing a catalyst, a first catalyst mixed treatment liquid impregnation layer, a PPS composite needle felt, and a second catalyst mixed treatment liquid Impregnation layer; the PPS composite needle felt includes the first PPS+catalyzed PTFE fiber strength layer, the PTFE base cloth layer, the second PPS+catalyzed PTFE fiber strength layer connected in sequence; the second PTFE microporous film layer containing the catalyst A catalyst mixed treatment liquid impregnated layer is laminated by hot pressing.

Beneficial effects of the present invention:

(1) The PPS composite felt functional filter material for denitrification and dioxins of the present invention has a wide range of applicable working conditions, and can complete the removal of harmful substances such as residual nitrogen oxides and dioxins without changing the original process equipment and working conditions. Catalytic decomposition of substances; safe and stable system operation, low resistance, high efficiency and long life, etc., energy consumption and operation and maintenance costs are reduced by 30%;

(2) The PPS composite felt functional filter material for denitrification and dioxins of the present invention has the effect of surface filtration at the same time, and the dust is trapped on the surface of the filter material, and the near ^- zero emission of dust amount less than 5mg/Nm can be realized;

(3) The PPS composite felt functional filter material for denitrification and dioxins of the present invention filters smoke and dust at the same time, due to the introduction of a multi-layered catalyst distribution layer, the contact area between the exhaust gas and the catalyst is doubled, and the nitrogen oxides are greatly improved. Catalytic decomposition efficiency of harmful substances such as dioxin and dioxin; give full play to the function of filter material to remove harmful substances;

(4) The base material is made of ultra-fine glass fiber and catalytic PTFE fiber to ensure that the filter material has a high tensile strength as a whole, and at the same time it has the function of catalytic decomposition of harmful substances such as nitrogen oxides and dioxins;

(5) The high-precision PPS composite felt functional filter material of the present invention has excellent temperature resistance. The continuous working temperature is 200°C, and the instantaneous temperature resistance can reach 220°C, which meets the dual requirements of the temperature conditions for the catalyst to decompose harmful substances such as nitrogen oxides and dioxins and the service life of the filter bag.

Description of drawings

Fig. 1 is a structural schematic diagram of the filter material of the present invention.

detailed description

In order to better illustrate the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

A preparation method of a PPS composite felt functional filter material for denitrification and dioxin, comprising the following steps: (1) After mixing active metal catalyst powder with PTFE resin, respectively make PTFE fiber containing catalyst and PTFE containing catalyst Microporous film; (2) PTFE fibers containing catalysts and high-strength PTFE fibers are alternately arranged in a manner of 1-10:1-10 to make warp beams, and woven into PTFE base cloth layers by weaving; (3) PPS fibers are mixed with short PTFE fibers containing a catalyst and put into a needle punching machine together with the PTFE base cloth layer to form a PPS+catalyzed PTFE fiber strength layer on both sides of the PTFE base cloth layer to make a PPS composite needle felt; (4 ) mixing the active metal catalyst emulsion with the PTFE emulsion to make a catalyst mixed treatment solution, and then impregnating the PPS composite needle felt as a whole, and then sintering at 280-350°C; (5) combining the sintered PPS composite needle felt with The PTFE microporous film containing the catalyst is introduced into the hot coating machine at the same time, and the surface is subjected to hot pressing coating processing. The active metal catalyst in the step (1) is selected from one or more of V ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ . In the step (1), the mass ratio of the active metal catalyst powder to the PTFE resin powder is 1-10:99-90. In the step (3), the ratio of the PPS fiber to the short PTFE fiber containing the catalyst is 1-99:99-1. In the step (4), the active metal catalyst emulsion and the active ingredient of the PTFE emulsion have a mass ratio of 1-99:99-1. The solid content of the PTFE emulsion is 30-50%. The effective components of the active metal catalyst emulsion are one or more of V ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ . The solid content of the active metal catalyst emulsion is 40-60%.

The PPS composite felt functional filter material for denitrification and dioxin prepared according to the above method, sequentially includes a PTFE microporous film layer containing a catalyst, a first catalyst mixed treatment liquid impregnation layer, a PPS composite needle felt, and a second catalyst mixed treatment liquid Impregnation layer; the PPS composite needle felt includes the first PPS+catalyzed PTFE fiber strength layer, the PTFE base cloth layer, the second PPS+catalyzed PTFE fiber strength layer connected in sequence; the second PTFE microporous film layer containing the catalyst A catalyst mixed treatment liquid impregnated layer is laminated by hot pressing.

Example 1

The active catalyst V ₂ O ₅ /TiO ₂ micropowder and PTFE resin are uniformly mixed together at a ratio of 2:98 to make PTFE fiber containing catalyst and PTFE microporous film containing catalyst; among them, the types of additives and The quality can be selected arbitrarily according to the needs. The PTFE fiber containing the catalyst is mainly used to make woven filter cloth, and the PTFE microporous film containing the catalyst is finally coated on the surface of the filter material. By implanting an active catalyst in the filter material, it can achieve the effect of removing harmful substances such as nitrogen oxides and dioxins in the flue gas while filtering the flue dust. Specific steps are as follows:

One is the warping process of PTFE fibers containing catalysts and high-strength PTFE fibers before weaving, using a 1:1 alternate arrangement to make warp beams, and weaving them into PTFE base fabrics by weaving to obtain PTFE base fabric layers 4;

The second is to mix the PPS fiber with the PTFE short fiber containing the catalyst in a ratio of 50:50, and then enter the needle punching machine together with the PTFE base cloth layer, and form the first PPS+catalyzed PTFE fiber strength layer on both sides of the PTFE base cloth layer3 And the second PPS+catalyzed PTFE fiber strength layer 5 to make PPS composite needle felt.

The third is to make a catalyst mixed treatment solution by making the active metal catalyst emulsion with a solid content of 50% and the PTFE emulsion with a solid content of 40% according to the mass ratio of active ingredients of 40:60, and carry out overall impregnation treatment on the PPS composite needle felt, After sintering at a high temperature of 280°C, the first catalyst mixed treatment liquid impregnated layer 2 and the second catalyst mixed treatment liquid impregnated layer 6 are formed on the upper and lower surfaces of the PPS composite needle felt.

Fourth, after the overall impregnation treatment of the filter material, the PTFE microporous film containing the catalyst is simultaneously introduced into the hot-coating machine, and the surface is subjected to hot-press coating processing, so that the PTFE microporous film 1 containing the catalyst is firmly combined with the substrate, Finally, the PPS composite felt functional filter material is made.

The PPS composite felt functional filter material for denitrification and dioxin is divided into six layers as a whole: from the dust face to the clean air face, there are PTFE microporous film layer 1 containing catalyst, the first catalyst mixed emulsion impregnated layer 2, and the second A PPS+catalyzed PTFE fiber strength layer 3, a PTFE base cloth layer 4, a second PPS+catalyzed PTFE fiber strength layer 5, and a second catalyst mixed emulsion impregnated treatment layer 6.

The PPS composite felt functional filter material for denitrification and dioxin significantly improves the filtration accuracy of the filter material. The filter material forms a multi-layered active catalyst distribution layer from the outside to the inside (the dust-facing surface to the clean gas surface). When the high-temperature flue gas passes through When the dust is blocked on the surface of the filter material; when the gas containing harmful substances passes through, harmful substances such as nitrogen oxides and dioxins react with the active catalyst, and the harmful components are decomposed into harmless substances and collected together with the dust , so as to achieve the double effect of flue gas dust removal and removal of harmful substances.

Parameters of PPS composite felt functional filter material for denitrification and dioxin

Example 2

The active catalyst V ₂ O ₅ -WO ₃ /TiO ₂ micropowder and PTFE resin are uniformly mixed together in a ratio of 10:90 to make PTFE fiber containing catalyst and PTFE microporous film containing catalyst; among them, the auxiliary agent The type and quality can be arbitrarily selected according to needs. The PTFE fiber containing the catalyst is mainly used to make woven filter cloth, and the PTFE microporous film containing the catalyst is finally coated on the surface of the filter material. By implanting an active catalyst in the filter material, it can achieve the effect of removing harmful substances such as nitrogen oxides and dioxins in the flue gas while filtering the flue dust. Specific steps are as follows:

One is the warping process of PTFE fibers containing catalysts and high-strength PTFE fibers before weaving, using a 1:2 alternate arrangement to make warp beams, and weaving them into PTFE base fabrics by weaving to obtain PTFE base fabric layers 4;

The second is to mix the PPS fiber with the PTFE short fiber containing the catalyst in a ratio of 30:70, and then enter the needle punching machine together with the PTFE base cloth layer, and form the first PPS+catalyzed PTFE fiber strength layer on both sides of the PTFE base cloth layer3 And the second PPS+catalyzed PTFE fiber strength layer 5 to make PPS composite needle felt.

The third is to make a catalyst mixed treatment solution with an active metal catalyst emulsion with a solid content of 45% and a PTFE emulsion with a solid content of 45% according to the mass ratio of active ingredients of 50:50, and perform overall impregnation treatment on the PPS composite needle felt, After sintering at a high temperature of 310°C, the first catalyst mixed treatment liquid impregnated layer 2 and the second catalyst mixed treatment liquid impregnated layer 6 are formed on the upper and lower surfaces of the PPS composite needle felt.

Fourth, after the overall impregnation treatment of the filter material, the PTFE microporous film containing the catalyst is simultaneously introduced into the hot-coating machine, and the surface is subjected to hot-press coating processing, so that the PTFE microporous film 1 containing the catalyst is firmly combined with the substrate, Finally, the PPS composite felt functional filter material is made.

The PPS composite felt functional filter material for denitrification and dioxin is divided into six layers as a whole: from the dust face to the clean air face, there are PTFE microporous film layer 1 containing catalyst, the first catalyst mixed emulsion impregnated layer 2, and the second A PPS+catalyzed PTFE fiber strength layer 3, a PTFE base cloth layer 4, a second PPS+catalyzed PTFE fiber strength layer 5, and a second catalyst mixed emulsion impregnated treatment layer 6.

The PPS composite felt functional filter material for denitrification and dioxin significantly improves the filtration accuracy of the filter material. The filter material forms a multi-layered active catalyst distribution layer from the outside to the inside (the dust-facing surface to the clean gas surface). When the high-temperature flue gas passes through When the dust is blocked on the surface of the filter material; when the gas containing harmful substances passes through, harmful substances such as nitrogen oxides and dioxins react with the active catalyst, and the harmful components are decomposed into harmless substances and collected together with the dust , so as to achieve the double effect of flue gas dust removal and removal of harmful substances.

PPS composite felt functional filter material for denitrification and dioxin

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (2)

1. a preparation method of the PPS composite felt functional filter material of denitrification and dioxin, is characterized in that, comprises the following steps: (1) After the active metal catalyst powder is mixed with the PTFE resin, the PTFE fiber containing the catalyst and the PTFE microporous film containing the catalyst are made respectively; (2) the PTFE fiber containing catalyst and the high-strength PTFE fiber adopt the mode of 1-10:1-10 to be arranged alternately to make warp beam, adopt the mode of weaving to weave and make PTFE base cloth layer; (3) PPS fibers are mixed with short PTFE fibers containing catalysts and put into the needle punching machine together with the PTFE base cloth layer to form PPS+catalyzed PTFE fiber strength layers on both sides of the PTFE base cloth layer to make PPS composite needle felt ; (4) Mix the active metal catalyst emulsion with the PTFE emulsion to make a catalyst mixed treatment solution, and perform overall impregnation treatment on the PPS composite needle felt, and then sinter at 280-350°C; (5) PPS composite needle-punched felt after sintering and the PTFE microporous film containing catalyst are simultaneously introduced in the hot coating machine, and the surface is subjected to hot pressing coating processing; the active metal catalyst in the step (1) is selected from V One or more of ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ ; the mass ratio of active metal catalyst powder and PTFE resin powder in the step (1) is 1-10:99-90; the step (3) the ratio of PPS fiber and the short PTFE fiber that contains catalyst is 1-99:99-1; The mass ratio of active metal catalyst emulsion and the active ingredient of PTFE emulsion is 1-99:99 in described step (4) -1; the solid content of the PTFE emulsion is 30-50%; the active ingredient of the active metal catalyst emulsion is one or more of V ₂ O ₅ , WO ₃ , MoO ₃ /TiO ₂ ; the active The solid content of the metal catalyst emulsion is 40-60%. 2. the PPS composite felt functional filter material of the denitrification prepared by the method according to claim 1 and dioxin, is characterized in that, comprises successively the PTFE microporous film layer that contains catalyzer, the first catalyzer mixed treatment liquid impregnated layer, PPS Composite needle felt, the second catalyst mixed treatment liquid impregnation layer; the PPS composite needle felt includes the first PPS+catalyzed PTFE fiber strength layer, PTFE base cloth layer, the second PPS+catalyzed PTFE fiber strength layer connected in sequence; the The PTFE microporous film layer containing the catalyst and the impregnated layer of the first catalyst mixed treatment liquid are laminated by hot pressing.