Filtering material for dedusting and low-temperature denitration, and preparation method and application thereof

A filter material and low-temperature denitrification technology, applied in chemical instruments and methods, separation methods, filtration separation, etc., can solve the problems of reduced denitrification efficiency, reduced service life of filter materials, and impact on filter strength, etc., to achieve long service life and mechanical High strength and good filtration performance

Active Publication Date: 2013-06-26
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN102145241 A discloses a method for preparing a denitrification catalyst loaded on a polyphenylene sulfide filter material. The polyphenylene sulfide filter material is calcined at a temperature of 300°C to 500°C for 5 to 7 hours and acidified, which will affect The strength of the filter material, thus reducing the service life of the filter material
[0005] Chinese patent CN102120116 A discloses a denitrification catalyst loaded on the mixed filter material of polyphenylene sulfide and polyimide to achieve a denitrification efficiency of 73% to 92% under the condition of 200°C, but it will The denitrification efficiency is significantly reduced

Method used

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  • Filtering material for dedusting and low-temperature denitration, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of upper layer dust and non-filter surface layer: use polyphenylene sulfide fibers with an average diameter of 14.5μm, a strength of 4.5CN / dtex, and an elongation of 28% to process into a fiber web through opening, carding, laying, and pre-needling Respectively as the dust layer and the non-filter surface layer;

[0037] Preparation of the intermediate fabric reinforcement layer: use polyphenylene sulfide fibers with an average diameter of 14.5μm, a strength of 4.5CN / dtex, and an elongation of 28% to be spun, heat-set, and woven into a plain weave fabric as the intermediate fabric reinforcement layer;

[0038] Preparation of the catalytic layer: The catalyst particles composed of manganese salts and cobalt salts were hot-pressed on the polyphenylene sulfide fibers at a temperature of 350 °C for 15 minutes, and then the polyphenylene sulfide fibers with the above catalyst particles attached After opening, carding, laying, and pre-needling, it is processed int...

Embodiment 2

[0041] Preparation of dust-facing layer and non-filtering surface layer: fibers obtained by mixing polyphenylene sulfide with an average diameter of 14.5 μm, a strength of 4.1 CN / dtex, and an elongation of 35% and meta-aramid are opened and carded , Laying, pre-acupuncture and processing into fiber nets are used as dust-facing layer and non-filtering surface layer respectively;

[0042] Preparation of middle fabric reinforcement layer: mix polyphenylene sulfide fiber with average diameter of 14.5μm, strength of 4.1CN / dtex, and elongation of 35% with meta-aramid fiber, then spin, heat-set, and weave into plain weave fabric as an intermediate fabric reinforcement;

[0043] Preparation of the catalytic layer: The catalyst particles composed of manganese salt and cerium salt were hot-pressed on the fiber mixed with polyphenylene sulfide and meta-aramid at a temperature of 400°C for 8 minutes, and then attached The fiber of above-mentioned catalyst particle is processed into fiber...

Embodiment 3

[0047] Preparation of dust-facing layer and non-filtering surface layer: use polyphenylene sulfide fibers with an average diameter of 17.5μm, a strength of 4.8CN / dtex, and an elongation of 30% to process into a fiber web through opening, carding, web laying, and pre-needling Respectively as the dust layer and the non-filter surface layer;

[0048] Preparation of the intermediate fabric reinforcement layer: use polyphenylene sulfide fibers with an average diameter of 17.5μm, a strength of 4.8CN / dtex, and an elongation of 30% to be spun, heat-set, and woven into a plain weave fabric as the intermediate fabric reinforcement layer;

[0049] The preparation of the catalytic layer: firstly, the polyphenylene sulfide fiber is opened, carded, laid, and pre-needled to obtain a polyphenylene sulfide fiber web, and then the catalyst particles composed of manganese salt, molybdenum salt and zinc salt are heated at a temperature of Under the conditions of 350°C and 12min, hot pressing is...

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Abstract

The invention discloses a filtering material for dedusting and low-temperature denitration, and an application of the filtering material. The filtering material consists of a dust layer, a catalyst layer, a middle fabric enhancement layer and a non-filtering surface layer, wherein the dust layer, the middle fabric enhancement layer and the non-filtering surface layer are formed by thermally resistant fibers with average diameters being 5-30 microns, strength being more than 3.0CN / dtex and elongation being less than 50%, and the catalyst layer is formed by a thermally resistant fiber net adhered with catalyst granules. The filtering material has the functions of dedusting and denitration, and the denitration efficiency can reach more than 85% at the temperature being less than 190 DEG C; and besides, the filtering material has the characteristics of good mechanical strength and long service life.

Description

technical field [0001] The invention relates to a filter material, in particular to a dust removal and low-temperature denitrification filter material and its application. Background technique [0002] As my country's environmental protection regulations become increasingly strict, controlling the discharge of nitrogen oxide pollutants is of great significance to the sustainable development of my country's national economy. NO X The control is the focus of work in the next 5 years. Industrial tail gas, especially waste incineration and coal-fired power plant exhaust gas contains a large amount of nitrogen oxides (NO X ) accounted for 42% of the total nitrogen oxide emissions, once these gases enter the atmosphere, they will become the main source of air pollution and photochemical pollution. Currently widely used in industry to remove NO X technologies including low NO X Combustion technology, non-catalytic selective reduction (SNCR), selective catalytic reduction (SCR) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B01D46/02B01D53/86B01D53/56B32B5/26B32B33/00
Inventor 顾立霞兰春艳姜锋李鑫
Owner CHINESE TEXTILE ACAD
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