Ceramic fiber high temperature gas filter and preparation method thereof

A ceramic fiber, high temperature gas technology, applied in chemical instruments and methods, separation methods, dispersed particle filtration, etc., can solve problems such as large filtration resistance and easy blockage

Inactive Publication Date: 2016-02-03
HEFEI FOUND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1970s, the world's advanced countries have been continuously researching high-temperature gas filtration treatment technologies and equipment of various materials and structures, hoping to improve the thermal shock resistan

Method used

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  • Ceramic fiber high temperature gas filter and preparation method thereof
  • Ceramic fiber high temperature gas filter and preparation method thereof

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preparation example Construction

[0017] A method for preparing a ceramic fiber high-temperature gas filter material, comprising the following operations:

[0018] a. Select N kinds of ceramic fibers with different aspect ratio ranges, N≥2;

[0019] b. Mixing the above-mentioned N types of ceramic fibers with different length-to-diameter ratios with binder and dispersant respectively to obtain injection molding slurry;

[0020] c. Inject the ceramic fiber injection molding slurry with the smallest length-to-diameter ratio range into the mold and filter it. The range from small to large is poured into the mold in sequence, and is formed by suction filtration. The formed filter material is dried together with the mold, and then demolded and fired to obtain a ceramic fiber high-temperature gas filter.

[0021] The ceramic fiber is divided into several kinds of slurries with different length-to-diameter ratio ranges by the above method, and the injection molding slurries are injected into the mold according to th...

Embodiment 1

[0029] a. Choose two different ceramic fibers with aspect ratios ranging from 1 to 20 and 20 to 60; the ceramic fibers are aluminum silicate fibers.

[0030] b. Mix and stir the above two kinds of ceramic fibers with different length-to-diameter ratios with binder, dispersant, and polypropylene short fibers respectively to obtain injection molding slurry, wherein the above two kinds of ceramic fibers and binder are in mass ratio 0.3:100, 1:100; described binding agent is the mixture of water glass and water, and wherein the mass ratio of water glass and water is 0.1:10; The short fiber of polypropylene accounts for the total mass of ceramic fiber, binding agent 0.01; the short fiber diameter of polypropylene is 10-100 μm, and the fiber length is 10-1000 μm; the amount of dispersant added is 0.1 of the total mass of ceramic fiber and binder.

[0031] c. According to the range of ceramic fiber aspect ratio from small to large, firstly inject the first type of ceramic fiber injec...

Embodiment 2

[0033] a. Choose 4 kinds of high-alumina fibers with aspect ratios ranging from 1 to 20, 20 to 60, 60 to 120, and 120 to 200.

[0034] b. Mix and stir the high-alumina fibers of the above four different length-to-diameter ratio ranges with the short fibers of the dispersant and polyacrylonitrile respectively to obtain the injection molding slurry, wherein the above four kinds of ceramic fibers and the binder are in a mass ratio of 0.3: 100, 0.6:100, 1.2:100, 1.5:100; the binder is a mixture of silica sol and water, wherein the mass ratio of silica sol to water is 0.5:10; short fibers of polyacrylonitrile account for ceramic fibers, The total mass of the binder is 0.03; the short fiber diameter of polyacrylonitrile is 10-20 μm, and the fiber length is 10-1000 μm; the amount of dispersant added is 0.3 of the total mass of the ceramic fiber and the binder.

[0035] c. Inject the injection molding slurry into the mold according to the range of aspect ratio of the ceramic fiber fro...

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Abstract

The invention relates to the gas-solid separation filed, in particular to a ceramic fiber high temperature gas filter and a preparation method thereof, wherein a filter layer which form the ceramic fiber high temperature gas filter is made from ceramic fibers, one end of the apertures of gas flow through holes in the filter layer is small along the direction of a channel, and another one end of the apertures of gas flow through holes in the filter layer is big along the direction of the channel. The method for preparing the ceramic fiber high temperature gas filter comprises steps: 1 N ceramic fiber with different length diameter radio ranges is selected and N >=2; 2 the N ceramic fiber with different length diameter radio ranges are respectively mixed with binders and dispersants to obtain injection molding pastes; and 3 the ceramic fiber injection molding paste with the smallest length diameter radio range is injected into a die and is extracted and filtered, the ceramic fiber injection molding pastes with other length diameter radio ranges are orderly injected into the die according to length diameter radio ranges from small to big after being formed according to the above method, and is extracted and filtered, and formed filter materials and the die are dried together, and then are demolded and sintered, thereby obtaining the ceramic fiber high temperature gas filter.

Description

technical field [0001] The invention relates to the field of gas-solid separation, in particular to a ceramic fiber high-temperature gas filter and a preparation method thereof. Background technique [0002] In the process of modern industrial production, various industrial furnaces and kilns in metallurgy, building materials, chemical industry, electric power, machinery and other industries emit a large amount of high-temperature dust-containing harmful gases, which seriously pollute the atmospheric environment. Due to the wide range of changes in the temperature and flue gas volume of the exhaust gas, and the large change in the viscosity of the exhaust gas under high temperature conditions, the humidity has dropped significantly, and the aggregation of fine particles has been greatly reduced. It is difficult to separate the particles in this high-temperature exhaust gas. higher. With the development of high temperature dedusting technology, the requirements for simplific...

Claims

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Application Information

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IPC IPC(8): B01D46/24B01D46/00
Inventor 汪家勤王德福魏兆锋付伟生经文贤杨玉泉
Owner HEFEI FOUND TECH
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