Device of achieving denitration and multistage ammonia spray of SCR (selective catalytic reduction) flue gas and flue gas denitration method

Abstract

The invention discloses a device of achieving denitration and multistage ammonia spray of SCR (selective catalytic reduction) flue gas and a flue gas denitration method. The device comprises a reactor body, wherein the reactor body sequentially comprises a first vertical section, a level connection section and a second vertical section in a flue gas flow direction; a flue gas inlet pipeline is arranged before the first vertical section; the second vertical section is internally provided with a plurality of layers of catalysts arranged horizontally; a flue gas outlet pipeline is arranged after the second vertical section; the first vertical section is internally provided with a first stage mixing and uniform distribution system; the second vertical section is internally provided with a second stage mixing and uniform distribution system; the first stage mixing and uniform distribution system comprises a vortex mixer and a plurality of ammonia spray pipes with nozzles over against a standing vortex area of the vortex mixer; the second stage mixing and uniform distribution system is arranged above the catalysts and comprises a plurality of high-pressure spray guns flushly and oppositely arranged on a front wall and a back wall of the second vertical section; and the high-pressure spray guns adopt conical multihole nozzles. The device and the method can effectively solve the problem of a concentration deviation of ammonia in a posterior-anterior depth direction of the reactor.

Description

technical field [0001] The invention belongs to the technical field of power station environmental protection, and relates to a method and a device for controlling pollutants emitted by coal-fired boilers, and in particular to a device for realizing SCR flue gas denitrification by multi-stage ammonia injection and a flue gas denitrification method. Background technique [0002] The main components of NOx in the flue gas of coal-fired power plant boilers are NO and NO 2 , of which NO accounts for about 90%, NO 2 The generated amount accounts for about 5% to 10% of the total NOx emissions according to different combustion conditions, and the rest is mainly N 2 O. 70% of my country's total nitrogen oxide emissions come from the direct combustion of coal, and the power industry is a large coal-burning household in my country. Therefore, it is urgent to carry out NOx control and treatment in the atmospheric environment, and the NOx control of coal-fired power plants is the top ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the first purpose of the present invention is to provide a method that can effectively solve the problem of concentration deviation of reducing agent ammonia in the depth of the SCR denitration reactor; A method for denitrification of flue gas

The method of spraying

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