Method for regenerating SCR (Selective Catalytic Reduction) denitration catalyst by on-line semi-dry method

Abstract

The invention discloses a method for regenerating an SCR (Selective Catalytic Reduction) denitration catalyst by an online semi-dry method. The method comprises the following steps: cleaning accumulated dust in an SCR denitration reactor; evaluating whether the ash removal effect reaches the standard or not; replacing and repairing the damaged catalyst unit body; drying and dehumidifying the catalyst; the active substance loading liquid is atomized, sprayed and loaded on the surface of the catalyst; active substances loaded on the catalyst are heated and cured by clean hot air; hardening the end face of the catalyst, and resetting a soot blower and accessory equipment; and performing high-temperature operation activation. Active substances of the SCR denitration catalyst can be supplemented online, the activity of the catalyst can be improved in a short time, the catalyst does not need to be disassembled, assembled, hoisted, transported, calcined and the like, the regeneration period can be greatly shortened, the construction period is only 1 / 4-1 / 2 of that of a traditional method, the method has the advantages of being time-saving, efficient, energy-saving, environment-friendly and the like, no waste water is generated in the regeneration process, and the method is suitable for industrial production. The problem of secondary pollution is not worried about, and obvious environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of air pollutant treatment, and in particular relates to an online semi-dry method for regenerating an SCR denitrification catalyst. Background technique [0002] As the country restricts the concentration of NOx emissions in flue gas more and more strictly, SCR denitrification, as a denitrification technology with high efficiency, good selectivity and mature technology, is currently being used in thermal power plants, industrial boilers, steel sintering machines, glass kilns Widely used in many thermal equipment. The denitrification catalyst is the core of the SCR denitrification device, and its performance directly affects the denitrification efficiency. [0003] During the use of SCR denitrification catalyst, the activity will be reduced due to factors such as wear, flow channel blockage, active material loss, micropore blockage, low temperature poisoning, etc., which will lead to a decrease in denitrifi...

AI Technical Summary

Problems solved by technology

[0005] The regeneration method of the catalyst workshop is mature and the regeneration effect is good, but there are also the following problems: (1) The regeneration process involves catalyst disassembly, hoisting, round-trip transportation, workshop regeneration, etc., and the construction period lasts for a long time

Taking the regeneration of a single 300MW unit with two layers of catalyst as an example, the regeneration period is about 35 days; (2) There are many links involved in the regeneration process, the consumption of raw materials is large, the energy consumption is large, and the regeneration cost is high; (3) The catalyst is in the workshop During the regeneration process, a large amount of waste water, dust, waste gas and other pollutants will be generated, which will easily cause secondary pollution and bring new environmental problems

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