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A catalytic ceramic filter tube and its preparation method

A ceramic filter tube and filter tube technology, which is applied in the direction of chemical instruments and methods, separation methods, physical/chemical process catalysts, etc., can solve the problems such as the decline of denitrification efficiency, and achieve the advantages of easy implementation, extended service life, and good high temperature resistance Effect

Active Publication Date: 2017-02-22
HUANENG POWER INT INC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two purification technologies have obvious disadvantages: first, there is no mature low-temperature catalyst available, and the flue gas can only be heated to a certain catalytic reaction temperature (300-400°C) for SCR denitrification; the second dust will Deposited on the SCR catalyst, blocking the pores and active sites of the SCR catalyst, resulting in a decrease in denitrification efficiency

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0047] The preparation method of catalytic ceramic filter tube of the present invention comprises the following steps:

[0048] 1. Preparation of ceramic filter tube matrix.

[0049] 1) Carry out pre-sintering and crushing of silicon carbide into particles and then sieve to obtain aggregates of different particle sizes, add high-temperature binder, and granulate through a mixer to obtain conventional powder;

[0050] 2) Put conventional powder into molds of different lengths, then put the molds into a cold isostatic press, form them by cold isostatic pressing, and finally dry them at 110-140°C in an air atmosphere, and then dry them The final ceramic core is sintered at 900-1200°C for 2-6 hours to obtain a ceramic matrix. The length of the prepared ceramic matrix is ​​1000, 1500, 3000mm, the outer diameter is 70mm, and the inner diameter is 50mm.

[0051] 2. Coating the catalytic active component layer on the ceramic filter tube substrate to obtain the catalytic ceramic filte...

example 1

[0063] The preparation method of catalytic ceramic filter tube of the present invention comprises the following steps:

[0064] 1. Preparation of ceramic filter tube matrix.

[0065] 1) Pre-sintering and crushing silicon carbide into particles and then sieving to obtain aggregates of different particle sizes, adding high-temperature binder polyvinyl alcohol, and granulating through a mixer to obtain conventional powder;

[0066] 2) Put conventional powder into molds of different lengths, then put the molds into cold isostatic presses, and dry them at 110°C under air atmosphere after cold isostatic pressing, and then dry the dried ceramic molds The core was sintered at 900°C for 2 hours to obtain a ceramic matrix.

[0067] 2. Coating the catalytic active component layer on the ceramic filter tube substrate to obtain the catalytic ceramic filter tube substrate.

[0068] 2.1 Preparation of boehmite sol; mix aluminum isopropoxide powder and water at a mass ratio of 3:20, and con...

example 2

[0078] The preparation method of catalytic ceramic filter tube of the present invention comprises the following steps:

[0079] 1. Preparation of ceramic filter tube matrix.

[0080] 1) Pre-sintering and crushing silicon carbide into granules and then sieving to obtain aggregates of different particle sizes, adding high-temperature binder JN-20 silica sol, and granulating through a mixer to obtain conventional powder;

[0081] 2) Put conventional powder into molds of different lengths, then put the molds into cold isostatic presses, and dry them at 120°C under air atmosphere after cold isostatic pressing, and then dry the dried ceramic molds The core was sintered at 1000°C for 4 hours to obtain a ceramic matrix.

[0082] 2. Coating the catalytic active component layer on the ceramic filter tube substrate to obtain the catalytic ceramic filter tube substrate.

[0083] 2.1 Preparation of boehmite sol; mix aluminum isopropoxide powder and water at a mass ratio of 3:20, and cont...

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Abstract

The invention provides a catalytic ceramic filter tube which is high in dust collection efficiency, can efficiently oxidize elemental mercury, can also efficiently reduce NOx, and achieves simultaneous dust removal and SCR denitration and a preparation method. The catalytic ceramic filter tube comprises a ceramic filter tube substrate, and a catalytic active component layer and a separation membrane which sequentially coat the ceramic filter tube substrate. The preparation method comprises the following steps: step 1. preparing the ceramic filter tube substrate by isostatic pressing molding; step 2. coating the ceramic filter tube substrate with a catalytic active component membrane to obtain a catalytic ceramic filter tube substrate; and step 3. preparing the separation membrane on the catalytic ceramic filter tube substrate. The catalytic ceramic filter tube provided by the invention can achieve integrated efficient removal of dust, NOx and elemental mercury in high-temperature flue gas (>300 DEG C), the service life of the catalyst can be prolonged through protection for the catalyst by the separation membrane and the substrate, and the structure arrangement of the ceramic filter tube can reduce the occupied area and running cost of equipment.

Description

technical field [0001] The invention relates to the field of dust filtration and purification and removal of gaseous pollutants in thermal power plants, in particular to a catalytic ceramic filter tube and a preparation method. Background technique [0002] The air pollution in my country is very serious. The energy structure dominated by coal combustion leads to soot-type pollution characteristics. The air pollutants caused by coal combustion include dust, SO 2 , NOx, mercury, etc. NO x Emission control technology is mainly low NO x Combustion technology and dry flue gas denitrification technology (mainly SNCR and SCR technology). The most commonly used catalytic active component for SCR denitrification is V 2 o 5 , it is a highly toxic substance that will cause serious pollution in the process of production and use, and the waste catalyst will pollute the environment again. [0003] Almost all thermal power plants in China have installed dust removal devices, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/54B01D53/86B01D53/56B01D53/64B01D69/10B01J23/889B01J35/10B01D46/00B01D46/24
Inventor 谭增强牛国平王晓冰罗志侯炜齐全
Owner HUANENG POWER INT INC
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