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Device and method for reducing toxic effect of SO2 on SCR (selective catalytic reduction) catalyst

A technology of SCR catalyst and SO2, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve problems such as poor performance and decreased catalyst activity, and achieve the effects of increasing catalyst life, reducing catalyst poisoning, and reducing costs

Active Publication Date: 2016-06-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

but generally resistant to SO 2 Poor performance at a certain concentration of SO 2 In the atmosphere, the catalyst activity decreased significantly

Method used

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  • Device and method for reducing toxic effect of SO2 on SCR (selective catalytic reduction) catalyst
  • Device and method for reducing toxic effect of SO2 on SCR (selective catalytic reduction) catalyst
  • Device and method for reducing toxic effect of SO2 on SCR (selective catalytic reduction) catalyst

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0022] figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention, figure 1 A porous cover 1 , a porous reaction vessel 2 , a molecular sieve membrane 3 and an SCR catalyst 4 are shown.

[0023] The porous reaction vessel 2 is made of porous materials, such as sintered filter elements, porous ceramics and porous alumina, etc., the upper half of w...

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Abstract

The invention discloses a device and a method for reducing the toxic effect of SO2 on an SCR (selective catalytic reduction) catalyst and belongs to the technical field of coal-fired flue gas denitrification. The device comprises a porous reaction container and a molecular sieve membrane, wherein the porous reaction container is made of a porous material and used for containing the SCR catalyst; the molecular sieve membrane covers the outer surface of the porous reaction container, and the pore diameter of the molecular sieve membrane is smaller than the molecular dynamic diameter of SO2 and larger than the molecular dynamic diameters of NH3 and NO. According to the sieving characteristics of a molecular sieve, NO, NH3 and O2 can enter the container and react on the surface of the SCR catalyst to generate N2 and H2O, generated N2 can flow out of an opening end of the container, but no SO2 or only a little SO2 can enter the container through reflux, and accordingly, the toxic effect of SO2 on the SCR catalyst is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas denitrification, and more specifically relates to a method for reducing SO 2 Apparatus and method for poisoning SCR catalysts. Background technique [0002] With the rapid development of the economy and the continuous improvement of people's living standards, the air pollution caused by NOx emitted by coal-fired power plants has attracted more and more attention. Selective Catalytic Reduction (SCR) process, as a mainstream coal-fired flue gas denitrification technology, has been widely used in China. As the core part of this technology, the SCR catalyst largely determines the overall denitrification performance and cost of the process. Generally, the dosage of SCR catalyst is about 0.8m 3 / MW, the chemical life is about 2 to 3 years. Due to various physical and chemical factors, the activity of the catalyst is reduced, and the catalyst will not be able to meet the denitrification re...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D53/86B01D53/54
CPCB01D53/228B01D53/8621B01D53/885B01D2256/10B01D2257/302B01D2258/0283
Inventor 张成李鑫方庆艳马仑谭鹏赵思楠张小培陈刚
Owner HUAZHONG UNIV OF SCI & TECH
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