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Regeneration process for denitration SCR (Selective Catalytic Reduction) catalyst

An SCR catalyst and process technology, applied in the field of denitration catalysts, can solve problems such as pollution and environmental pollution, and achieve the effect of effective activity recovery

Inactive Publication Date: 2018-06-22
天津浩创节能环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few patents on the regeneration method of flue gas denitrification catalysts in my country. Most of the existing patents are based on the regeneration of vanadium-titanium catalysts, and vanadium pentoxide is a highly toxic substance, which not only causes serious damage during production and use. pollution, and the regenerated vanadium-titanium catalyst will still cause continuous pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A regeneration process of a denitration SCR catalyst, the specific steps are as follows:

[0030] (1) Remove impurities on the surface of the deactivated SCR catalyst, use a gas nozzle and a dust suction device to remove impurities on the surface of the SCR catalyst, and remove the dust on the surface of the SCR catalyst by blowing and suction;

[0031] (2) Cleaning the deactivated SCR catalyst after surface impurity removal with an acid solution to wash away alkali metals or alkaline earth metals in the deactivated SCR catalyst;

[0032] (3) The first calcination of the deactivated SCR catalyst after surface impurity removal and acid solution cleaning;

[0033] (4) soaking the deactivated SCR catalyst after the first calcination with a supplement, and supplementing the catalyst;

[0034] (5) Secondary calcination is performed on the deactivated SCR catalyst after the catalyst is supplemented to obtain an active SCR catalyst.

[0035] In step (1), the dry air is spray...

Embodiment 2

[0040] A regeneration process of a denitration SCR catalyst, the specific steps are as follows:

[0041] (1) Remove impurities on the surface of the deactivated SCR catalyst, use a gas nozzle and a dust suction device to remove impurities on the surface of the SCR catalyst, and remove the dust on the surface of the SCR catalyst by blowing and suction;

[0042] (2) Cleaning the deactivated SCR catalyst after surface impurity removal with an acid solution to wash away alkali metals or alkaline earth metals in the deactivated SCR catalyst;

[0043] (3) The first calcination of the deactivated SCR catalyst after surface impurity removal and acid solution cleaning;

[0044] (4) soaking the deactivated SCR catalyst after the first calcination with a supplement, and supplementing the catalyst;

[0045] (5) Secondary calcination is performed on the deactivated SCR catalyst after the catalyst is supplemented to obtain an active SCR catalyst.

[0046] In step (1), the dry air is spray...

Embodiment 3

[0051] A regeneration process of a denitration SCR catalyst, the specific steps are as follows:

[0052] (1) Remove impurities on the surface of the deactivated SCR catalyst, use a gas nozzle and a dust suction device to remove impurities on the surface of the SCR catalyst, and remove the dust on the surface of the SCR catalyst by blowing and suction;

[0053] (2) Cleaning the deactivated SCR catalyst after surface impurity removal with an acid solution to wash away alkali metals or alkaline earth metals in the deactivated SCR catalyst;

[0054] (3) The first calcination of the deactivated SCR catalyst after surface impurity removal and acid solution cleaning;

[0055] (4) soaking the deactivated SCR catalyst after the first calcination with a supplement, and supplementing the catalyst;

[0056](5) Secondary calcination is performed on the deactivated SCR catalyst after the catalyst is supplemented to obtain an active SCR catalyst.

[0057] In step (1), the dry air is spraye...

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PUM

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Abstract

The invention provides a regeneration process for a denitration SCR (Selective Catalytic Reduction) catalyst. The regeneration process comprises the following specific steps: removing impurities fromthe surface of an inactivated SCR catalyst, and removing dust from the surface of the SCR catalyst in a blowing and sucking manner; washing the inactivated SCR catalyst which is subjected to surface impurity removal by using an acid solution, and washing away alkali metals or alkaline earth metals from the inactivated SCR catalyst; performing primary roasting on the inactivated SCR catalyst whichis subjected to the surface impurity removal and the acid solution washing; soaking the inactivated SCR catalyst which is subjected to the primary roasting by using a supplementing agent, and supplementing a main agent to the inactivated SCR catalyst; performing secondary roasting on the inactivated SCR catalyst which is subjected to the main agent supplement to obtain an SCR catalyst with activity. On one hand, the activity of the denitration SCR catalyst can be recovered effectively without damaging a catalyst carrier, and moreover, the regenerated catalyst cannot pollute the environment; onthe other hand, the regeneration process is suitable for a vanadium-titanium denitration catalyst, and is also suitable for other types of denitration SCR catalysts.

Description

technical field [0001] The invention relates to the technical field of denitration catalysts, in particular to a regeneration process of a denitration SCR catalyst. Background technique [0002] Denitrification refers to the removal of nitrogen oxides, and my country is currently the world's largest emitter of nitrogen oxides. Nitrogen oxides are the main reason for the formation of acid rain. The annual loss caused by acid rain pollution in my country exceeds 300 billion yuan. Among many denitration methods, selective catalytic reduction (SCR) has the highest denitration efficiency, mature technology and no sound field of harmful substances, and has become the main method for nitrogen oxide control at home and abroad. In the SCR system, the catalyst is the core of denitration, but the SCR catalyst is easily poisoned due to dust in the flue gas and oxides of alkali metals or alkaline earth metals, and the SCR catalyst loses its activity, and the cost of the catalyst general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/02B01J38/04B01J38/48B01J38/60
CPCB01J38/60B01J38/02B01J38/04B01J38/48
Inventor 田晓亮田永军田浩
Owner 天津浩创节能环保设备有限公司