Random forest model based power-station boiler flue gas denitration method

Abstract

The invention provides a random forest model based power-station boiler flue gas denitration method, and belongs to the technical field of denitration in a power plant. The method comprises the following steps that S1) an OFA air door instruction, a low-nitrogen air door instruction, a secondary wind pressure, a mill fan running station, a hearth oxygen content, a set main steam flow of a flue gasdenitration system are set as independent variable parameters and the inlet NOx concentration of an SCR reactor is set as a dependent variable parameter of a training model; S2) historical data of the independent and dependent variable parameters of the flue gas denitration system is recorded; S3) the historical data of the independent and dependent variable parameters is input to a random forestmodel to obtain a random forest denitration model; S4) during denitratio, a predicted value of the inlet NOx concentration of the SCR reactor is obtained from the random forest model; and S5) the opening degree of an ammonia supply control valve is calculated according ot the predicted value of the inlet NOx concentration of the SCR reactor, and ammonia spraying denitration is carried out. The problems of nonlinearity and much delay of a control object of the SCR ammonia spraying control system in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of denitrification in power plants, and relates to a method for denitrification of power plant boiler flue gas based on a random forest model. Background technique [0002] SCR flue gas denitrification technology is to spray the reducing agent ammonia into the flue gas, and use the catalyst to convert NOx in the flue gas into N 2 and water. However, while the flue gas is denitrified, the catalyst can make part of the SO in the flue gas 2 Oxidation to SO 3 , and react with unreacted ammonia in the SCR denitrification process to form viscous ammonium hydrogen sulfate, which will cause harm to the catalytic bed and air preheater. [0003] At present, the denitrification system in the thermal power generation unit is designed according to the boiler system, and the reaction zones of the denitrification system are respectively arranged on the flues on both sides, and the position is located between the air pre...

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Problems solved by technology

[0010] The invention proposes a power plant boiler flue gas denitrification method based on a random forest model, which solves the problem of non-linearity and large delay in the control object of the SCR ammonia injection control system in the prior art

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