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Regeneration method of SCR denitration catalyst

A technology of SCR catalyst and denitration catalyst, applied in the field of catalyst regeneration, can solve the problems of complicated separation and purification procedures, difficulty in separation and purification, and high processing cost, and achieve the effect of saving heavy metal resources, avoiding adverse effects and shortening the process flow

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process is relatively complicated, and the V in the SCR catalyst 2 o 5 and WO 3 or MoO 3 The content is relatively low, the separation and purification are difficult, the separation and purification procedures are complicated, and the processing cost is high

Method used

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  • Regeneration method of SCR denitration catalyst
  • Regeneration method of SCR denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of cleaning solution: Weigh 0.05Kg of isooctyl alcohol polyoxyethylene ether phosphate, 0.05Kg (0.2%) of ammonium lauryl sulfate, and weigh 49.90Kg (99.8%) of sulfuric acid with an acid molar concentration of 0.5mol / L. Stir for 5 minutes to make it evenly mixed and prepare a 50Kg cleaning solution.

[0028](1) Take the discarded denitrification catalyst and the SCR denitrification monolithic honeycomb catalyst (150×150×1000mm) whose denitrification activity has been reduced from 90% to 30%, and blow it with 0.2MPa oil-free dry compressed air for 30 minutes to clean the surface. and dust accumulation in the hole. Soak the purged catalyst in 50Kg cleaning solution, and make the cleaning solution flush the catalyst for 20 minutes to remove the alkali metals and alkaline earth metals that are bonded to the catalyst and make the catalyst poisoned, then put the catalyst into a blast drying box for The temperature was raised to 100°C at a rate of 10°C / min, and kep...

Embodiment 2

[0034] Preparation of cleaning solution: Weigh 0.05Kg of polyoxyethylene lauryl ether phosphate ammonium salt, 0.05Kg (0.2%) of fatty amine (alkylamine) polyoxyethylene ether, and weigh 0.5mol / L acid molar concentration Sulfuric acid 49.90K (99.8%), stirred for 10 minutes to make it evenly mixed, and prepared as 50Kg cleaning solution.

[0035] (1) Take the discarded denitrification catalyst and the SCR denitrification monolithic honeycomb catalyst (150×150×1000mm) whose denitrification activity has been reduced from 90% to 20% from a factory, and blow it with 0.2MPa oil-free dry compressed air for 30 minutes to remove the surface and dust accumulation in the hole. Soak the purged catalyst in 50Kg cleaning solution, and make the cleaning solution flush the catalyst for 20 minutes to remove the alkali metals and alkaline earth metals that are bonded to the catalyst and make the catalyst poisoned, then put the catalyst into a blast drying box for The temperature was raised to 1...

Embodiment 3

[0041] Preparation of cleaning solution: weigh 0.1Kg of alkylphenol polyoxyethylene ether and 0.1Kg (0.4%) of ammonium lauryl sulfate, weigh 49.80Kg (99.6%) of sulfuric acid with an acid molar concentration of 0.5mol / L, and stir for 15 Minutes, make it mix evenly, and prepare 50Kg cleaning solution.

[0042] (1) Take the discarded denitrification catalyst and the SCR denitrification monolithic honeycomb catalyst (150×150×1000mm) whose denitrification activity has been reduced from 90% to 40% from a factory, and blow it with 0.2MPa oil-free dry compressed air for 30 minutes to remove the surface and dust accumulation in the hole. Soak the purged catalyst in 50Kg cleaning solution, and make the cleaning solution flush the catalyst for 20 minutes to remove the alkali metals and alkaline earth metals that are bonded to the catalyst and make the catalyst poisoned, then put the catalyst into a blast drying box for The temperature was raised to 100°C at a rate of 10°C / min, and kept ...

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Abstract

The invention discloses a regeneration method of an SCR denitration catalyst. The regeneration method includes: (1), performing ash blowing, cleaning and drying on the SCR denitration catalyst which is waste and deactivated; (2), smashing the waste SCR denitration catalyst which is dried well, adding a strong base solution of 10 wt%-40 wt% in mass concentration, and reacting for 3-8 h at temperature of 150-200 DEG C; (3), adjusting pH value of reaction liquid in the step (2) to 9-10, filtering and separating to obtain recovery liquid containing sodium tungstate and sodium vanadate, and adjusting concentration of vanadium in regeneration liquid to 2-10 g / L; (4), soaking the deactivated SCR denitration catalyst dried well in the step (1) in the regeneration liquid with concentration fixed well in the step (3) at room temperature for regeneration, and taking out before placing for 60 min at room temperature; (5), drying, roasting and cooling a catalyst in the step (4) to obtain a regenerated SCR denitration catalyst. The regeneration method has the advantages of good regeneration effect, low SO2 / SO3 conversion rate and low regeneration cost.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration, in particular to a regeneration method for an SCR denitration catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) denitration technology is an efficient, reliable and mature flue gas denitrification technology, which is widely used in coal-fired power plant boiler flue gas denitrification systems in China. SCR denitrification catalyst is a key component of this technology. The "Twelfth Five-Year Plan" requires my country's coal-fired power plants to strictly implement the new standards for flue gas denitrification, which stimulated the explosive growth of SCR catalyst market demand during the "Twelfth Five-Year Plan" period. As a large number of SCR catalysts are currently put into use, after a few years, waste or deactivated SCR catalysts will become a major solid waste treatment problem in this field. By regenerating the waste flue gas denitrification cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/00B01J38/68
Inventor 王宽岭刘忠生王学海杨英陈高升陈玉香
Owner CHINA PETROLEUM & CHEM CORP
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