Development Of Control System And Process Analysis Of Carbon Calcined Kiln

Carbon anode is a very important electrode material on electrolytic producing, it has a decisive significance effect on the current efficiency electrolyzer. The production processing of carbon anode including calcination, molding and baking, assemble. Burning technology, which is calcined petroleum coke into raw materials with certain mechanical and physical and chemical indicators after the calcined petroleum coke, so we short called them calcined coke.Calcined coke is the main raw material of carbon anode production, the quality of coke anode block determined by the quality of calcined coke, there is a closely relationship between calcined coke's quality improving and the quality of the kiln control levels. As the leading technology in the process of burning carbon anode electrolytic production systems products play a critical role.Currently, domestic and foreign common calcination technologies generally have the following four:kiln, Tank Calciner, rotating bed, electric furnace Duan. Of these, the most widely used is rotary kiln. The world's approximately 85% of calcined coke production is used kiln.The paper in 3,4# rotary kiln calcining process of CHALCO GUIZHOU branch Carbon plant for the background, performing process control technology reseach on rotary kiln without burning. Based on the detailed analysis of the process, features and the existence of the difficult process control technology. It identified three study elements, namely, the former feeding material flow control, cooling kiln's nesting temperature control and Rotary Kiln entire process of Computer Integrated Process Control.Apply digital filtering technology to the feeding instantaneous flow value smoothed to solv affection to the process control system by the fluctuations of PV; apply adaptive control technology to the feeding belt speed control, reduce belt speed change's affection on control system; bring the error of actual flow and setpiont value and the error's rate of change into control systems, apply fuzzy control technology, completing speed control of the feed disk. Lower feed volume fluctuations, increased the quantitative effect of control o f the former feeding material system, greatly reducing incidents of the refractory material collapse and out of control caused by feeding flow's greatly changing,laying a good foundation for the follow-up research work.Apply mathematical modeling, established cooling kiln cooling process mathematical model, using temperature, flow Cascade control to solv temperature control of cooling kiln nesting. Because of the existence of very serious time lag makes conventional means of control can not be achieved (also called uncontrollable), address this issue, combined analysis of the process technology data, blends the predictive control, compensation control into the cascade control system. Control procedures using Visual C++development, through OPC Server achieved control procedures and DCS database data communications. Through practical experiments, debugging first ring (the internal water flow control), then debug Central (Exhaust temperature kiln cooling+control in the cooling temperature compensation control), the final adjustment time predictive control loop. In the time of actual debugging, achieving a series of data and curves which has achieved a good control.Against technology systems and the characteristics of a control system using DCS distributed control system as the main framework, while Combination can be made into a PLC controlled system, applications third-party communication software for data exchange. Heterogeneous systems through the establishment of a rotary caclined kiln of the entire process control computer integrated surveillance...