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Alkali washing liquid for regenerating SCR denitration catalysts and application thereof

A technology of denitration catalyst and alkaline washing solution, applied in the field of alkaline washing solution, can solve problems such as affecting the denitration rate of SCR denitration catalyst

Inactive Publication Date: 2015-08-12
CHONGQING UNIV
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Problems solved by technology

However, since alkali metals are included in the poisoning and deactivation of the SCR denitration catalyst, the prior art uses sodium or potassium salts, which affects the denitration rate of the regenerated SCR denitration catalyst to a certain extent. improvement

Method used

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  • Alkali washing liquid for regenerating SCR denitration catalysts and application thereof
  • Alkali washing liquid for regenerating SCR denitration catalysts and application thereof
  • Alkali washing liquid for regenerating SCR denitration catalysts and application thereof

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Embodiment Construction

[0020] 1. An alkaline washing liquid used for regenerating the SCR denitration catalyst, the alkaline washing liquid is composed of an organic base, a surfactant and deionized water. In the present invention, the organic base is ethanolamine (C 2 h 7 NO), diethanolamine (C 4 h 11 NO 2 ), triethanolamine (C 6 h 15 NO 3 ), triethylamine [N(CH 2 CH 3 ) 3 ], N-methyldiethanolamine (C 5 h 14 NO 2 ) in one or two mixtures; the surfactant is one or two mixtures of emulsifier OP-10, penetrant AEP, penetrant OEP-70, penetrant JFC; the proportioning of each component is, Organic base 3-30wt.%, surfactant 0.1-1wt.%, deionized water 69-96.9wt.%.

[0021] 2. A method for regenerating an SCR denitrification catalyst, the regeneration method comprising the steps of purging the SCR denitrification catalyst to be regenerated with air, ultrasonic alkaline washing, rinsing with water and then draining, calcining, supplementing active components and secondary calcining. In the prese...

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Abstract

An alkali washing liquid for regenerating SCR denitration catalysts and an application thereof are provided. The alkali washing liquid is composed of an organic alkali, a surfactant and deionized water, wherein the organic alkali is a mixture of one or two of ethanol amine, diethanol amine, triethanolamine, triethylamine and N-methyl diethanol amine. In the method for regenerating the SCR denitration catalysts, firstly, to-be-regenerated SCR denitration catalysts are subjected to air purging and cutting, then immersed in the alkali washing liquid, and subjected to ultrasonic alkali washing. Compared with the prior art, the method has surface repairing and surface reconstruction processes aiming at the to-be-regenerated SCR denitration catalysts increased, and finally, after active ingredient supplementing and calcination processes, the specific surface area and the denitration rate of the obtained regenerated SCR denitration catalysts are both relatively greatly improved compared with those of the conventional washing and regeneration technology. The alkali washing liquid is suitable for regeneration treatment of the honeycomb type, corrugated type and plate type SCR denitration catalysts.

Description

technical field [0001] The invention relates to an alkali washing solution used in the regeneration process of an SCR denitration catalyst and an application of the alkali washing solution in the regeneration process of the SCR denitration catalyst. Background technique [0002] Nitrogen oxides (NO X ), is a pollutant harmful to the human body, and must be treated—it is commonly called "denitration". At present, the SCR denitrification catalyst is the most widely used denitrification device and plays a central role in the denitrification device. Because the SCR denitrification catalyst is in the environment of high temperature and dense dust for a long time, not only the surface is easy to sinter and form mesopore blockage, but also the fly ash, alkali (earth) metal, arsenic, phosphorus, sulfur dioxide and other substances in the flue gas are easy to make the SCR denitrification catalyst Poisoning, so that its catalytic activity decreased (referred to as "deactivation"). I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/66B01D53/56B01D53/86
Inventor 杜军刘作华陶长元李泽英刘龙龙邱月杨雨谢斌唐清
Owner CHONGQING UNIV
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