Research And Application Of Advanced Control Strategy For Rotary Kiln Incinerator

Rotary kiln incinerator is an important equipment in the process of treatment about hazardous waste.Because of its long residence time,good heat insulation,and strong adaptability to incineration changes,rotary kiln incinerator is widely used in three waste treatment process in industry.However,the control system of rotary kiln incinerator is complicated,which furnace temperature object has the characteristics of large time delay,large inertia and so on.The single PID control in the production site cannot meet the control requirements.Therefore,it is necessary to study the advanced control strategy of rotary kiln incinerator to improve the control quality.This dissertation takes the rotary kiln incinerator of the three waste treatment center of a vitamin production plant in Shandong as the research object,and establishes the corresponding furnace temperature model based on actual operation data of production site.Based on the existing software and hardware platform on the site,the advanced control system of rotary kiln incinerator is designed and applied.After analyzing the operation status of the advanced control system at production site,this paper proposes an adaptive full-integration sliding mode furnace temperature control strategy based on Smith prediction.The main research and development work includes the following contents:(1)Using the method of combining theoretical analysis and experiments to establishing the mathematical model of temperature of rotary kiln incinerator.Based on this,an advanced control system for rotary kiln incinerator is designed.According to the characteristics of rotary kiln incinerator,the temperature of the furnace is large delay,large inertia and slow time-varying,a furnace temperature-flow cascade ratio control scheme is constructed,which uses the generalized predictive controller as the main controller,and the PID controller is considered as the secondary controller in the cascade control structure.For furnace pressure control,a feed-forward compensation PID control loop is used.The simulation proves the effectiveness and control quality of the designed advanced control system.(2)In order to solve problems in the debugging process,the advanced control system is optimized in terms of disturbance-free switching,anti-saturation and air-fuel ratio.The software and hardware platform of the advanced control system is constructed,and the connection between the advanced control system and the configuration software is tested.After setting the controller parameters of the advanced control system,the system is applied to the actual project.The operation results show that the designed advanced control system improves the control quality of rotary kiln incinerator,improves the treatment efficiency of hazardous waste,and also brings considerable economic benefits to the enterprise.(3)In order to further improve the temperature control quality of the rotary kiln incinerator,an adaptive full-integral sliding mode control strategy based on Smith prediction is proposed in this paper.Then,this strategy is compared with generalized predictive control.The simulation results show that the adaptive full-integration sliding mode controller system based on Smith prediction has fast response speed,high control accuracy,strong anti-interference ability,so it has the best effect on furnace temperature control.The control strategy also provided a new idea for the later transformation of the project.