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Regeneration method for arsenic poisoning selective catalytic reduction denitration catalyst

A denitrification catalyst and selective technology, applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of catalyst strength damage, complex regeneration process, reduced service life, etc., and achieve denitrification activity The effect of improving, simplifying the process flow and improving efficiency

Inactive Publication Date: 2014-07-02
河北宏庚环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the study, it was found that the Chinese invention patent application with publication number CN102814201A mentioned a regeneration method for arsenic poisoning, but it uses the alternating action of strong acid and strong alkali, which will damage the strength of the regenerated catalyst and reduce the service life; in addition, its regeneration process It is more complicated, increases the cost of industrial production, and will produce a large amount of waste liquid to pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The sample taken is a vanadium-tungsten-titanium plate denitration catalyst that has been in operation for 25,000 hours in a power plant. The denitration rate was found to be 55% after testing, and the cause of deactivation was severe arsenic poisoning.

[0024] (1) Use 3Mpa, flow rate 0.5m 3 / s of clean and dry compressed air to blow the deactivated SCR denitrification catalyst for 15 minutes to remove the dust on the surface;

[0025] (2) Place the catalyst treated in step (1) in a mixture of 0.2mol / L dilute sulfuric acid, 0.3mol / L potassium permanganate, 0.3wt% microporous penetrant JFC, 1wt% ammonium metavanadate and 3wt% molybdenum In the regenerating solution composed of ammonium acid, ultrasonic assisted impregnation for 30 minutes, the ultrasonic power is 400W;

[0026] (3) Rinsing: immerse the catalyst treated in step (2) in flowing deionized water and rinse for 10 minutes;

[0027] (4) Drying and roasting: The catalyst treated in step (3) was dried with hot ...

Embodiment 2

[0030] The sample taken is a vanadium-tungsten-titanium plate denitration catalyst that has been in operation for 25,000 hours in a power plant. The denitration rate was found to be 55% after testing, and the cause of deactivation was severe arsenic poisoning.

[0031] (1) Use 3Mpa, flow rate 0.5m 3 / s of clean and dry compressed air to blow the deactivated SCR denitrification catalyst for 15 minutes to remove the dust on the surface;

[0032] (2) Place the catalyst treated in step (1) in a mixture of 0.2mol / L dilute sulfuric acid, 0.6mol / L potassium permanganate, 0.3wt% microporous penetrant JFC, 1wt% ammonium metavanadate and 3wt% molybdenum In the regenerated solution composed of ammonium acid, ultrasonic assisted impregnation for 10 minutes, the ultrasonic power is 400W;

[0033] (3) Rinsing: immerse the catalyst treated in step (2) in flowing deionized water and rinse for 10 minutes;

[0034] (4) Drying and roasting: The catalyst treated in step (3) was dried with hot a...

Embodiment 3

[0037] The sample taken is a vanadium-tungsten-titanium plate denitration catalyst that has been in operation for 25,000 hours in a power plant. The denitration rate was found to be 55% after testing, and the cause of deactivation was severe arsenic poisoning.

[0038] (1) Blow the deactivated SCR denitrification catalyst for 15 minutes with clean and dry compressed air with a flow rate of 3Mpa and 0.5m3 / s to remove the dust on the surface;

[0039] (2) Place the catalyst treated in step (1) in a mixture of 0.2mol / L dilute sulfuric acid, 0.1mol / L potassium permanganate, 0.3wt% microporous penetrant JFC, 1wt% ammonium metavanadate and 3wt% molybdenum In the regenerated solution composed of ammonium acid, ultrasonic assisted impregnation for 10 minutes, the ultrasonic power is 400W;

[0040] (2) Rinsing: immerse the catalyst treated in step (3) in flowing deionized water and rinse for 10 minutes;

[0041] (4) Drying and roasting: The catalyst treated in step (4) was dried with ...

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PUM

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Abstract

The invention discloses a regeneration method for an arsenic poisoning selective catalytic reduction denitration catalyst. The regeneration method comprises the following four steps of blowing ash, dipping, dipping, and drying and roasting. According to the regeneration method, an arsenic component which can cause SCR (Selective Catalytic Reduction) denitration catalyst poisoning can be effectively removed by using regenerated liquid and active ingredients can be supplemented; an SCR denitration catalyst obtains a certain arsenic poisoning resisting capability; meanwhile, a regeneration process is greatly simplified and the regeneration cost of the SCR denitration catalyst is reduced; with the adoption of the method, the regenerated denitration catalyst can be used for carrying out denitration activity detection and the denitration rate can be up to 80-88%.

Description

technical field [0001] The invention relates to the field of selective catalytic reduction denitrification catalysts, in particular to a regeneration method for arsenic poisoning selective catalytic reduction denitrification catalysts. Background technique [0002] Selective catalytic reduction (SCR) is the mainstream process of flue gas denitrification technology in coal-fired power plants. 3 reacts to produce harmless N 2 and H 2 O. Catalyst is the core of SCR flue gas denitrification technology, and its performance directly affects the overall denitrification effect of the SCR system. However, in the high-temperature and high-dust operating environment, it is easy to cause the catalyst to be deactivated by various influences, such as high-temperature sintering agglomeration, micropore blockage, alkali metal poisoning and SO 2 poisoning etc. At present, the catalysts used in China usually need to be replaced every 2 to 3 years, and the replacement cost accounts for ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/70
Inventor 王朋洪挺代永强侯娜娜
Owner 河北宏庚环保设备有限公司
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