Composition detection and ammonia injection control system of scr denitrification process

Abstract

The invention discloses a component detection and ammonia spraying control system of an SCR denitrification process. The component detection and ammonia spraying control system comprises an ammonia spraying main pipe, a plurality of ammonia spraying branch pipes, a flow field distribution controller and a smoke detection device, wherein the smoke detection device comprises a plurality of sampling heads which are arranged at an inlet flue and / or outlet flue of an SCR reactor, the plurality of sampling heads are distributed at different positions on the cross section of the inlet flue and / or outlet flue so as to detect the gas component data at different positions of the inlet flue and / or outlet flue, and the smoke detection device transmits the collected gas component data to the flow field distribution controller; and the plurality of ammonia spraying branch pipes are communicated with the ammonia spraying main pipe, and the openness of a valve of the ammonia spraying main pipe and the openness of a valve of each ammonia spraying branch pipe are controlled by the flow field distribution controller according to the gas component data. The total ammonia gas injection amount of the SCR reactor and the total ammonia gas injection amount of each ammonia spraying branch pipe are precisely controlled, so that the amount of the ammonia gas sprayed from the flues are reasonably re-distributed according to the concentration value of the harmful gas component measured by the smoke detection device in different areas of the flue.

Description

technical field [0001] The application belongs to the technical field of flue gas denitrification, and in particular relates to a component detection and ammonia injection control system of an SCR denitrification process. Background technique [0002] With the development of modern industrial production and the improvement of living standards, air pollution has become a matter of great concern to people. There is a big problem in air pollution, nitrogen oxides NO X pollution problem. NO X Under the action of sunlight, it will cause photochemical reaction and form photochemical smog, which will cause serious air pollution. NO X The problem of air pollution in China has been paid more and more attention. It has been found that: the harm to human health, high content of nitric acid rain, photochemical smog, ozone reduction and other problems are all related to low concentration of NO X It does, and it's far more harmful than was originally thought. [0003] Flue gas denit...

AI Technical Summary

Problems solved by technology

[0005] In view of this, this application provides a composition detection and ammonia injection control system for SCR denitrification process, which is used to solve the problem of rough control of ammonia injection amount, poor injection accuracy, high ammonia escape rate and problems in the prior art. Air preheater serious blockage and other technical problems

Images