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

A denitration catalyst and catalyst technology, which are applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of increasing the difficulty of catalyst regeneration, reducing the pressure of wastewater treatment, and reducing the consumption of regeneration agents. , the effect of reducing the difficulty of regeneration and reducing water consumption

CN113441190APending Publication Date: 2021-09-28SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-09-28

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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.
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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...

Examples

Embodiment

[0037] A power plant plate catalyst, the module size is 1882mm*954mm*1676mm, the module weight is 1230kg, each catalyst module contains 16 small pieces of catalyst units, each unit size is 464mm*464mm*709.5mm. The catalyst had operated for over 30,000 hours before regeneration.

[0038]Randomly select three catalyst modules, unbox them, and name them B1, B2, and B3. Lift off the steel mesh on the top of the catalyst module, and hang a steel number plate on the catalyst module. Disassemble and take out the catalyst units inside the catalyst module, and uniformly mark the catalyst units with relatively severe wear. Manually remove the dust accumulated on the windward side of the plate catalyst unit and the outer surface of the catalyst unit shell. Place the plate-type catalyst unit in the automatic soot blowing equipment room, and use compressed air to automatically remove the ash accumulation in the interlayer of the catalyst sheet. Each catalyst sheet layer is purged one by...