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Intermetallic compound porous matrix composite filter element and preparation method thereof

An intermetallic compound, porous matrix technology, applied in chemical instruments and methods, separation methods, dispersed particle filtration, etc., can solve the problem of increasing cost and process complexity, reducing filtration effect and gas reduction rate, and reducing the specific surface area of ​​the intermediate layer, etc. question

Active Publication Date: 2017-07-18
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the catalytically active substance is attached to the porous substrate through the intermediate layer carrier, and the intermediate layer material is usually TiO 2 , due to TiO 2 High viscosity, low strength, and certain hydraulicity in contact with water, so to prepare a catalytic film layer with a certain shape, mechanical strength, specific surface area and activity, it is often necessary to add various additives to the carrier, which not only increases the cost and complexity of the process properties, but also greatly reduce the specific surface area of ​​the middle layer
And since TiO 2 The water hardness of the middle layer often causes the catalytic active material to fall off after the middle layer absorbs water, greatly reducing the filtration effect and gas reduction rate

Method used

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  • Intermetallic compound porous matrix composite filter element and preparation method thereof
  • Intermetallic compound porous matrix composite filter element and preparation method thereof
  • Intermetallic compound porous matrix composite filter element and preparation method thereof

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preparation example Construction

[0029] The preparation method of the intermetallic compound porous matrix composite filter element 110 includes the following steps: 1) preparing the porous matrix 111a; 2) configuring the sol as the material source of the intermediate layer 111c, then impregnating the sol into the porous matrix 111a, and then making The sol in the porous matrix 111a is gelled, and then the porous matrix 111a attached to the gel is heat-treated to convert the gel into nanoparticles, and then form the intermediate layer 111b; 3) configure the precursor solution of the catalytic active material, and then put The precursor solution is impregnated into the porous substrate 111a attached to the intermediate layer 111b, and then the porous substrate 111a attached with the precursor solution is heat-treated to form a catalytic active layer 111c on the intermediate layer 111b. And when the membrane layer 112 is arranged on the windward surface of the porous composite body 111, the following additional ...

Embodiment

[0034] An intermetallic compound porous matrix composite filter element 110 for integrated treatment of dust removal and denitrification of boiler furnace gas in a coal-fired power plant was prepared, and its dust removal and denitrification effect was tested. The preparation of the intermetallic compound porous matrix composite filter element 110 in this example, at first, adopts the formula of -100 mesh aluminum powder 30% (weight), -200 mesh iron powder 70% (weight), and sinters the aluminum system by powder metallurgy. Iron-aluminum intermetallic compound porous matrix 111a, the air flux of which is tested is 368m 3 / m 2 .h.kpa, the average pore diameter is 35μm, the tensile strength at room temperature is 90MPa, and the porosity is 42%. Image 6 and Figure 8 They are respectively 100 times and 500 times magnified photos of the porous matrix 111a under an electron microscope, where it can be observed that the surface of the pores of the porous matrix 111a is relatively ...

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Abstract

The invention relates to dust removal and denitrification of industrial furnace gas. The intermetallic compound porous matrix composite filter element disclosed by the present invention is a functional element with dual functions of filtering and reaction catalysis for the substance to be filtered. It has a porous composite body, and the porous composite body includes a porous matrix and a catalytic active layer. The porous matrix is ​​made of intermetallic compound material, the catalytically active layer is attached to the porous surface of the porous matrix and is composed of catalytically active substances, and the porous composite also includes an intermediate layer, which is composed of composed of nanoparticles, the catalytically active layer is attached to the porous substrate through an intermediate layer, and the material of the intermediate layer is Al 2 O 3 , the Al 2 O 3 Attached to the surface of the porous substrate and the pore surface of the porous substrate. The invention also discloses a preparation method of the filter element. The invention can greatly increase the adhesion amount and uniformity of catalytic active substances, and is especially suitable for filter cores composed of aluminum-based intermetallic compound porous substrates.

Description

technical field [0001] The invention relates to purification treatment of industrial furnace gas, in particular to dust removal and denitrification of industrial furnace gas. Wherein, the term "industrial furnace gas" refers to the furnace gas produced by industrial kilns and coal-fired boilers. In addition, the present invention also relates to an intermetallic compound porous matrix composite filter element, that is, a functional element with dual functions of filtering dust and reaction catalysis of the material to be filtered. Background technique [0002] Industrial furnace gas often contains a large amount of dust and nitrogen oxides. A typical example is the furnace gas of a coal-fired power plant boiler. The nitrogen oxides contained in it are the main cause of acid rain. It also contains dozens of grams of dust. The usual method for purifying industrial furnace gas with high dust and nitrogen oxide content such as coal-fired power plant boiler furnace gas is to fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56B01D46/54
Inventor 高麟汪涛莫代林刘勇覃金
Owner CHENGDU INTERMENT TECH
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