Flue gas denitrification method of power plant boiler based on random forest model

Abstract

The invention belongs to the technical field of power plant denitrification, and proposes a power plant boiler flue gas denitrification method based on a random forest model. It includes the following steps: S1: Determine the independent variable parameters of the training model as the OFA damper command of the flue gas denitrification system, the low-nitrogen damper command, the secondary air pressure, the operating status of the powder discharger, the oxygen content of the furnace, the main steam flow of the unit, and the dependent variable The parameter is the NOx concentration at the inlet of the SCR reactor; S2: Record the historical data of the variable parameters and dependent variable parameters of the flue gas denitrification system; S3: Input the historical data of the respective variable parameters and dependent variable parameters into the random forest model to obtain the random forest denitrification Model, S4: During denitrification, the variable parameters of the flue gas denitrification system are input into the random forest denitrification model to obtain the predicted value of NOx concentration at the inlet of the SCR reactor. Ammonia denitrification. The invention solves the problem of non-linearity and large delay of the control object of the SCR ammonia injection control system in the prior art.

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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