Ash removal method for regeneration pretreatment of plate-type denitration catalyst

Abstract

The invention discloses an ash removal method for regeneration pretreatment of a plate-type denitration catalyst. The ash removal method comprises the following steps: (1) dry-process ash removal via compressed-air purging: disassembling a catalyst module, removing accumulated ash on the surface of a catalyst unit body, putting the catalyst unit body into an automatic ash blowing equipment room, conducting blowing with compressed air in the windward side and the leeward side of the catalyst unit body separately, and placing the catalyst unit body having been subjected to ash removal in a module box again; (2) wet-process ash removal via automatic spraying: starting an automatic spraying and washing line to spray and wash the catalyst module; (3) ash removal via high-pressure water gun flushing: flushing the windward side of the catalyst module via a high-pressure water gun under the condition that the high-pressure water gun and the windward side of the catalyst module forms an angle of 90 degrees, then flushing a module box shell, hoisting the catalyst module, and conducting flushing from the leeward side of the catalyst module by using the high-pressure water gun. The method can be used for comprehensively and thoroughly removing accumulated ash on the outer surface of the catalyst and the pore channels of the catalyst, and follow-up catalyst regeneration difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration treatment, in particular to an ash removal method for plate type denitration catalyst regeneration pretreatment. Background technique [0002] Most of the SCR denitrification systems of coal-fired units are arranged with high temperature and high dust, and the flue gas flow rate is about 6m / s; during long-term operation, high-speed fly ash particles will cause wear and blockage of the catalyst. The clogging of the catalyst's macro-flue gas flow channels is mainly caused by the large-scale falling of fly ash and large particles of fly ash. The upstream of the SCR denitrification reactor is easy to accumulate fine fly ash, which will fall on the catalyst in a large scale once accumulated to a certain extent, and it is easy to block the pores of the catalyst in the long run. Regeneration is a commonly chosen solution to deal with deactivated catalysts, which can effectively restore the...

AI Technical Summary

Problems solved by technology

Furthermore, when the catalyst is regenerated, the ash deposits in the catalyst pores and the outer surface will affect the active ingredients of the regeneration agent, thereby increasing the difficulty of catalyst regeneration. Therefore, it is necessary to deposit ash on the catalyst pores and their outer surfaces to clean up

[0004] At present, there is no complete ash removal method for plate catalyst regeneration pretreatment. In view of this, the development of a pretreatment ash removal method before plate catalyst regeneration can greatly reduce the difficulty of later regeneration and reduce the pressure of wastewater treatment.

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