Flue gas denitration transformation method for coal-fired generating unit

Abstract

The invention belongs to the technical field of denitration transformation for power plants, and particularly relates to a flue gas denitration transformation method for a coal-fired generating unit.The method comprises the steps that according to the existing arrangement of the tail of a boiler, a SCR reactor is additionally arranged behind a BK shaft at the tail of the boiler, a SCR reactor isadditionally arranged above the inlet flue of an electric dust remover, and the SCR reactors are arranged in the mode of one boiler with two SCR reactors; flue gas is introduced into the SCR reactorsfrom the outlet horizontal flue of a coal economizer, NOx in the flue gas is removed under the combined action of ammonia and catalysts; and the purified flue gas subjected to the above treatment is introduced into an air preheater. According to the method, by adopting the SCR denitration process and transforming corresponding facilities of the boiler, the denitration efficiency is improved, the environment-friendly emission requirements of high standards are met, and the influence of coal burning on the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of denitrification transformation of power plants, and in particular relates to a method for transformation of flue gas denitrification of coal-fired generating sets. Background technique [0002] The environmental pollution caused by coal-based power production in my country is a restrictive factor for the development of the power industry. The flue gas produced by coal combustion contains pollutants such as soot, sulfur oxides (SOX), nitrogen oxides (NOX) and CO2, which have caused serious environmental problems and are important issues to be solved urgently for the sustainable development of my country's economy. [0003] Faced with increasingly higher environmental protection emission requirements and the tight supply of the coal market, power plants have found it difficult to maintain the stability of the coal quality of the unit for a long time. With the change of coal quality, the amount of flue gas p...

AI Technical Summary

Problems solved by technology

[0004] At present, the coal-fired generating units of domestic power plants have generally been in service for many years, and most of the original generating units do not have denitrification devices. However, with the improvement of environmental protection emission standards, the existing units can no longer meet the emission standards of nitrogen oxides. The flue gas denitrification transformation of the existing coal-fired generating units is carried out, and the flue gas generated by the boiler combustion is denitrated to achieve the standard emission of nitrogen oxides