Design and Application of Automatic Control Strategy for Deacidification of Waste Incinerator Based on TD-PLS Model Predictive Feedforward
The automatic control of the semi-dry de-acidification system in the waste incinerators has the problems of a low operation rate and poor control effect.In this paper,a cooperative HCl-SO2 control strategy combining PID control and model prediction feedforward is designed based on the analysis of the operating characteristics of the de-acidifi-cation system.A cascade PID cooperative control strategy with HCl emission concentration as the primary control objective and SO2 emission concentration as the secondary objective is proposed.Then,an HCl emission concentration prediction model based on time difference-partial least squares(TD-PLS)was developed as a control feedforward.This control strate-gy was applied to the de-acidification system of a 500 t/d waste incineration,and the actual application effect shows that:before the control strategy was implemented,the HCl emission concentration fluctuated greatly,the hourly emission average value varied in the range of 20-40 mg/m3,and the hourly emission average concentration relative standard deviation(RSD)was 15.95％.After the control strategy was implemented,the average hourly HCl emission varied from 25 mg/m3 to 30 mg/m3,and the RSD of the average hourly emission concentration was 6.22％.Under the coordinated control,the hourly HCl emission means value fluctuation was significantly reduced,and the lime slurry consumption per unit of boiler evaporation was reduced from 0.034 m3/t to 0.027 m3/t,which was 21％lower than before.A stable and economical operation of the waste incinerator de-acidification system was achieved while the outlet HCl and SO2 concentrations meet the standards.
waste incineratorsemi-dry deacidificationautomatic controlkey variable model feedfowardcoordinated control
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