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Recovery and regeneration method of clogged deactivated scr catalyst and regenerated scr catalyst carrier

A SCR catalyst and catalyst technology, applied in the field of regenerated SCR catalyst carrier, can solve the problems of low actual use value, high cost, and low catalyst activity recovery ability, and achieve good catalytic activity, mechanical strength, and high activity recovery ability.

Active Publication Date: 2016-05-18
PANZHIHUA ZHENGYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Either these methods are costly, or the experimental process is tedious, and the actual use value is not high; and the inventor is committed to the production research of catalytic titanium dioxide, and from the perspective of the production enterprise, it is proposed to retain the active components in the waste catalyst, and only separate the waste catalyst. A new environmentally friendly and low-cost recycling method for harmful substances in catalysts has achieved good results
[0005] However, in the prior art, catalysts that are only clogged but not poisoned are regenerated on-line by soot blowing, drying, etc., and the regenerated catalyst has low activity recovery ability.

Method used

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  • Recovery and regeneration method of clogged deactivated scr catalyst and regenerated scr catalyst carrier
  • Recovery and regeneration method of clogged deactivated scr catalyst and regenerated scr catalyst carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0033]Weigh 25 kg of waste catalyst (blocked and deactivated catalyst), crush it into small pieces of 0.5-1cm by a plastic crusher, pass through a 50-mesh vibrating sieve, and add water to wash the dust, and put the washed catalyst fragments into 60 kg concentration Soak in 1M dilute nitric acid for 1-2 hours, filter, wet pulverize with a pulverizer, add 50 kg of water, control the concentration of the catalyst slurry at 26wt%, put it into a sand mill for ultrafine pulverization, and take a sample to detect that the particle diameter is 20-45nm Qualified; unqualified secondary beating;

[0034] Put the qualified catalyst slurry into the slurry tank, add pure water until titanium dioxide accounts for about 23wt% of the slurry, add ammonia water to adjust the pH to 7.5, add ammonium paratungstate and white carbon black, and the addition amount meets the following requirements: WO 3 The content accounts for 5wt% of the regeneration carrier, SiO 2 The content accounts for 5wt% of...

Embodiment 2

[0037] Weigh 25 kg of waste catalyst, break it into small pieces of 0.5-1cm by a plastic crusher, pass through a 50-mesh vibrating sieve, add water to wash the dust, put the washed catalyst fragments into 60 kg of dilute nitric acid with a concentration of 1M and soak 1-2 hours, after filtration, wet pulverization by pulverizer, add water to adjust the concentration of catalyst slurry to control at 30wt%, put it into sand mill for superfine pulverization, and take samples to detect that the particle diameter is 45-100nm is qualified; unqualified secondary beating ;

[0038] Put the qualified catalyst slurry into the slurry tank, add pure water until titanium dioxide accounts for about 23wt% of the slurry, add ammonia water to adjust the pH to 8.0, add ammonium paratungstate and white carbon black, and the addition amount meets the following requirements: WO 3 The content accounts for 5wt% of the regeneration carrier, SiO 2 The content accounts for 5wt% of the regenerated carr...

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Abstract

The invention discloses a method for recovering and regenerating a blocked and deactivated SCR catalyst and a regenerated SCR catalyst carrier. The invention aims at the recovery and regeneration method of the blocked and deactivated SCR catalyst, which is to crush and grind the catalyst into a slurry with a particle diameter of 20-100nm after preliminary treatment, and then adjust the pH, add active ingredients, filter, calcinate, pulverize, etc. , remove the harmful components in the waste catalyst and keep the active components in the catalyst, so as to obtain a low-cost and environmentally friendly recycling and regeneration method, and the performance and effect of the regenerated catalyst carrier can meet the standards for preparing SCR catalysts, and has excellent performance.

Description

technical field [0001] The invention belongs to the field of recovery and regeneration of denitration catalysts, and in particular relates to a low-cost recovery and regeneration method of a blocked and deactivated SCR denitration catalyst and a regenerated SCR catalyst carrier prepared therefrom. Background technique [0002] As the impact of PM2.5 on the environment becomes more and more serious, people pay more and more attention to factors such as smoke and automobile exhaust that produce PM2.5. More and more stringent, Selective Catalytic Reduction (SCR) denitrification technology is widely used in the denitrification system of coal-fired power plants due to its efficient and reliable denitrification performance. The principle of SCR denitrification technology is to inject NH into the exhaust gas of the boiler 3 These reducing agents react with the NOx in the flue gas under the action of the catalyst to generate harmless nitrogen and water. The core of SCR denitrifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J38/68B01J27/053B01J27/30
Inventor 朱建兵李振兴
Owner PANZHIHUA ZHENGYUAN TECH
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