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Method and device applied to in-situ regeneration of sulfur-poisoning SCR denitration catalyst

A denitration catalyst, in-situ regeneration technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of improving catalytic activity, reducing decomposition temperature, and efficient regeneration and recovery

Active Publication Date: 2017-11-24
CHONGQING UNIV +1
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AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of "sulfur poisoning" of the existing SCR denitrification catalyst, the present invention provides an in-situ regeneration method and device that is easy to operate, has a high catalyst regeneration rate, and can effectively solve the regeneration problem of "sulfur poisoning" of the SCR denitrification catalyst

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  • Method and device applied to in-situ regeneration of sulfur-poisoning SCR denitration catalyst
  • Method and device applied to in-situ regeneration of sulfur-poisoning SCR denitration catalyst
  • Method and device applied to in-situ regeneration of sulfur-poisoning SCR denitration catalyst

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0029] Such as figure 1 Shown is an in-situ regeneration device for a sulfur-poisoned SCR denitration catalyst, which includes an ozone generator 1 , an SCR denitration reactor 2 and an on-line monitoring control unit 3 .

[0030] As a specific embodiment, wherein the ozone generator generates ozone by means of high-voltage discharge.

[0031] As a specific example, ozone is controlled by the solenoid valve (3.1) and enters the flue from the ozone generator, and the NO in the flue gas is oxidized to NO by ozone oxidation. 2 .

[0032] A method for in-situ regeneration of a sulfur poisoning SCR denitration catalyst, comprising the following steps:

[0033] (1) The flue gas NOx c...

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Abstract

The invention provides a method and a device applied to in-situ regeneration of a sulfur-poisoning SCR denitration catalyst. The method comprises the following steps: pre-oxidizing part of smoke before entering to an SCR denitration reactor when the SCR denitration catalyst is deactivated by sulfur poisoning, oxidizing part of NO in the smoke, then enabling the smoke to enter into the SCR denitration reactor, accelerating decomposition of ammonium sulfate on the surface of the catalyst, and carrying out regeneration process of the catalyst. The device applied to in-situ regeneration of the sulfur-poisoning SCR denitration catalyst comprises an ozone generator, an electromagnetic valve, an SCR denitration reactor and a smoke NOx component online monitor. The method and the device are capable of effectively decomposing ammonium sulfate deposited on the surface of the catalyst under the condition with temperature of 200-380 DEG C; the activity of the treated sulfur-poisoning catalyst is improved; the service life of the catalyst is prolonged; the replacement cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to the field of selective catalytic reduction (SCR) denitration catalysts, in particular to an in-situ regeneration method and device for sulfur poisoning SCR denitration catalysts. Background technique [0002] In the two sessions in 2017, the government work report mentioned: to increase the protection and governance of the ecological environment. Accelerating the improvement of the ecological environment, especially the air quality, is the urgent desire of the people and the inherent requirement of sustainable development. Nitrogen oxides (NO x ), as one of the main pollutants in the atmosphere, contributes to the formation of acid rain, photochemical smog and haze. In recent years, the state has proposed stricter nitrogen oxide emission standards for coal-fired power plants, glass factories, cement factories, iron and steel enterprises and other small industrial furnaces. Among various nitrogen oxide control technologies, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J38/04B01D53/88B01D53/56
CPCB01D53/8625B01D53/8696B01D53/88B01D2251/2062B01D2258/0283B01J23/02B01J23/888B01J38/04B01J2523/00B01J2523/55B01J2523/47B01J2523/69
Inventor 杜学森王向民陈艳容向劲瑶杨仲卿蒲舸冉景煜张力
Owner CHONGQING UNIV
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