Industrial boiler SNCR denitration control system and control method

Abstract

The invention discloses an industrial boiler SNCR denitration control system and control method. The system comprises an execution layer, a sensing layer, a conversion layer, a control layer and a management layer; the sensing layer comprises a flue gas quantity dynamic measurement module; the flue gas quantity dynamic measurement module is used for collecting the first content information of NO and O2 in a hearth; the conversion layer is used for obtaining the concentration of NOx according to the first content information and calculating second content information of NH3 according to the concentration of NOx; the control layer is used for generating a control instruction according to the second content information and controlling the working states of a spray gun, an air compressor and an ammonia spray regulating valve according to the control instruction, so that the spray gun sprays a reducing agent into the hearth. The content of nitric oxide in the hearth is monitored in real time, the amount of the reducing agent is controlled according to the content of nitric oxide, so that the situation that the reducing agent is insufficient or wasted is avoided, control stability and quality are improved, and intelligent control is achieved. The system and method can be widely applied to the technical field of flue gas denitrification.

Description

technical field [0001] The invention relates to the technical field of industrial automation control and flue gas denitrification, in particular to an industrial boiler SNCR denitrification control system and control method. Background technique [0002] With the acceleration of my country's urbanization process, according to the "China Statistical Yearbook-2019" data, in 2018 my country's domestic waste removal volume was 228 million tons; there were 1,091 harmless treatment plants with a processing capacity of 226 million tons, of which incineration There are 331 factories with a processing capacity of 102 million tons. The amount of urban waste generated is increasing at a growth rate of about 10%, and the growth rate of Beijing, Shanghai, Shenzhen, and Guangzhou has reached more than 15%. From the proposal of urban waste classification, to the implementation of the "zero waste city" construction plan, further promote the implementation of the principles of harmless, redu...

AI Technical Summary

Problems solved by technology

Manually switch under different working conditions, but after actual use, these two methods cannot achieve stable control of nitrogen oxides, and can only be added with urea or ammonia solution, which will cause ammonia escape, cause corrosion to equipment, and cause waste of reducing agent

The existing SNCR denitrification system has the disadvantages of poor systematization, single reducing agent ratio, non-automatic adjustment or poor adjustability, low degree of intelligent control, and poor system overall planning.

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