Application Research On Waste Heat Power Generation Intelligent Controller

Along with the technology of the cement waste heat power application gradually to theconstruction site, it is becoming more and more important to realize the intelligent control ofthe waste heat power generation systems. Especially the control of drum level of waste heatboiler and the control of water level of deaerator and condenser have long been as thedifficulties of waste heat power generation system control. These control links which hascharacteristics of many variables and nonlinear and strong coupling. And the structure of thesystem is different from the structure of the ordinary thermal power system. Therefore, it’sdifficult to gain good effect with the traditional control methods. In order to ensure thecontinuous stable production of waste heat power generation and to improve the generatingcapacity and the level of automation, applying intelligent control to waste heat powergeneration production process has become an important research field.Conventional cascade PID control, with a simple model and simple algorithm and easyto control, has been made in a wide range of applications. Predictive functional control, for itsadvantages of simple algorithm and easy to calculate and track fast, has been successfullyapplied in the metallurgical, chemical and other fields; And linear quadratic control is amodern control theory based on the state space. The control system obtained by this methodhas a good robustness and dynamic characteristics. This paper based on the above methods, anintelligent controller is proposed, which combines multiple control algorithms effectively, andhas been applied to the main control links of the cement waste heat power generation.The subject of this paper is supported by Major Projects of Technology DevelopmentPlan of Shandong Province, named “Key Technology Research and Application Demon-stration of Cement Waste Heat Power Generation”. In this paper, the work is to study wasteheat power generation system in accordance with the sub-link module. This paper takescontrol mechanism of a waste heat power generation system, the research of intelligentcontrol algorithm, system simulation and engineering applications as the main line. Accordingto the actual situation of some cement plant waste heat power generation project, this paper has fully analyzed the control requirements and difficulties of the waste heat power generationsystem, and gain the target to realize the stability of drum level of waste heat boiler and thestability of water level of deaerator and condenser. In this paper, we use the combinationcontroller to realize the control of boiler drum level based on conventional PID and PFC-PIDand LQR, and use the combination controller to realize the control of water level of deaeratorand condenser based on conventional PID and PFC-PID. Intelligent controller is divided intothe characterization parameters choices, and parameters pretreatment and conditionsdiscrimination and the controller output switches and controllers set up. On System design,firstly, analysis and verification are made by simulation with MATLAB. Secondly, on thisbasis, we focus on the field application of engineering practice.In this paper, we have designed DCS control system of the waste heat power generationproduction, and the intelligent controller has been embedded into the DCS system by usingOPC technology.We use modular design process to realize system programming design whichcan enhance the scalability of the system link control. The field trial running results show thatthe intelligent controller can realize the automatic control of the important link of the wasteheat power generation.