Method for optimized regulation of SCR (Selective Catalyst Reduction) flue gas denitration system in coal-fired power plant

Abstract

At present, a regenerative Junker-type air preheater is used for heating boiler-supplied air in most of large coal-fired power generating sets in China, and ammonium bisulfate results in scaling and corrosion on the surface of heat transfer elements at the medium / low temperature end of the air preheater, thereby threatening the safe and stable operation of the air preheater directly. The invention relates to a method for the optimized regulation of an SCR (Selective Catalyst Reduction) flue gas denitration system in a coal-fired power plant, which comprises the following steps of: (1) jetting ammonia into a denitration reactor; (2) measuring the concentrations, the speeds and the temperature distribution of NO and O2 at an inlet of the denitration reactor; (3) measuring the concentration distribution of NO and O2 at an outlet of the denitration reactor; (4) calculating the unevenness Cv of the concentration distribution of NO at the outlet of the denitration reactor; and (5) comparing the obtained Cv with C%. The method effectively reduces ammonia escape, prevents ammonium bisulfate from scaling and corrosion on the surface of the heat transfer elements of the air preheater, and ensures the safe and stable operation of the air preheater.

Description

technical field [0001] The invention relates to an SCR flue gas denitrification system of a coal-fired power plant, in particular to an optimization adjustment method for the SCR flue gas denitrification system of a coal-fired power plant. Background technique [0002] With the development of my country's electric power industry, NOx emissions are increasing day by day. As we all know, NOx pollution can form acid rain, photochemical smog, and destroy the ecological environment. Its impact has attracted more and more attention and attention. At present, newly built coal-fired generating units basically require the installation of SCR (selective catalytic reduction) flue gas denitrification devices to reduce NOx emissions. Install SCR flue gas denitrification device. [0003] The principle of SCR flue gas denitrification is to spray ammonia into the flue gas under the action of a catalyst to reduce NO x catalytic reduction to N 2 and H 2 O, the main reaction formula is 4NO...

AI Technical Summary

Problems solved by technology

[0006] At present, the optimal adjustment method of the coal-fired SCR flue gas denitrification system that can be used for the above three typical ammonia injection methods has not been reported yet.

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