SCR (Selective Catalytic Reduction) flue gas denitration system control method and apparatus

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) flue gas denitration system control method and apparatus. The SCR flue gas denitration system control method includes the following steps that: a first RBF neural network is adopted to obtain the predicted value of NOx generated after boiler combustion according to boiler operating parameters, the sampling concentration of NOx of an SCR flue gas denitration system; a second RBF neural network is adopted to obtain ammonia spray amount set values of ammonia spray valves for SCR flue gas denitration according to the predicted value of the NOx and the operating parameters of the SCR flue gas denitration system; and a DMC (Dynamic Matrix Control)-based ammonia spray amount controller is adopted to control total ammonia spray amount according to the ammonia spray amount set values of the ammonia spray valves so as to perform SCR flue gas denitration treatment. With the method and apparatus of the invention adopted, denitration efficiency can be effectively improved, and the escape rate of NH3 of the exit of the SCR denitration system can be reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a control method and equipment for an SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) flue gas denitrification system. Background technique [0002] As my country's environmental protection policy requirements are increasing year by year, NOx (nitrogen oxides) in the flue gas emitted by thermal power units has been included in strict supervision. SCR flue gas denitrification technology has a high denitrification rate, reliable technology, and simple structure. And the advantages of small ammonia escape rate have become the main choice for coal-fired power plant boilers to control NOx emissions. [0003] SCR refers to the use of reducing agents (such as NH 3 , liquid ammonia, urea) to "selectively" react with NOx in the flue gas and generate non-toxic and pollution-free N 2 (nitrogen) and H 2 O (water), SCR is an important part to ensure the s...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a control method and equipment for an SCR flue gas denitrification system to solve the problems of lagging NOx concentration measurement signal at the denitrification inlet and high ammonia escape rate in the current SCR flue gas denitrification process. High cost and low overall denitrification efficiency

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