Regeneration method of inactivated denitration catalyst

Abstract

The invention relates to the field of denitration catalyst regeneration, and discloses a regeneration method of an inactivated denitration catalyst. The method comprises the following steps that the inactivated denitration catalyst is subjected to first soaking by pre-pickling liquid after physical dust removal is completed, and is then subjected to first bubbling cleaning; (2) the catalyst cleaned in the first step is subjected to second soaking by oxidation cleaning liquid, and is then subjected to oxidation ultrasonic cleaning; (3) the catalyst cleaned in the second step is subjected to third soaking by alkali washing liquid, is then subjected to ultrasonic alkali washing and is rinsed by water; (4) the catalyst cleaned in the third step is subjected to ultrasonic acid washing by acid washing liquid, and is then subjected to second bubbling cleaning; (5) the catalyst cleaned in the fourth step is impregnated by impregnating liquid; then, drying and calcination are performed to obtain a regenerated denitration catalyst. Substeps are used for chemical cleaning; the goal of clearing arsenic compounds deposited in inactivated denitration catalyst micropores can be effectively realized; the denitration efficiency of the inactivated denitration catalyst is effectively recovered.

Description

technical field [0001] The invention relates to the field of regeneration of denitration catalysts, in particular to a regeneration method of deactivated denitration catalysts. Background technique [0002] The denitrification catalyst is the core of flue gas denitrification technology in coal-fired power plants. During the operation of denitrification catalysts, arsenic poisoning is an important cause of catalyst deactivation. Regenerating the deactivated denitration catalyst to restore its activity can achieve the purpose of catalyst recycling and reduce the cost of catalyst replacement. [0003] CN103894240A discloses a regeneration method of arsenic poisoning selective catalytic reduction denitrification catalyst, including steps: (1) soot blowing: use 2-8MPa, flow rate 0.3-1.0m 3 / s of clean and dry compressed air to blow the deactivated SCR denitrification catalyst to remove the dust on the surface, the time is 10-30min; (2) impregnation: place the catalyst treated i...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the regenerated denitrification catalyst in the prior art is not thorough enough to remove arsenic compounds, and to provide a regeneration method for the deactivated denitrification catalyst. The effect of improving the denitrification rate of the regenerated catalyst

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