Study And Implementation Of The Intelligent Control System Of Antimony Oxide Production Process

Antimony oxide (antimony trioxide),also called antimony white, is a high value-added flame-retardant material, whose main production equipment is the antimony white furnace, whose most important control parameter is the temperature in the furnace. Since the precision control of the liquid level and the temperature in the furnace is needed to produce highly pure, ultra-fine grain and highly white antimony oxide, and up to now, the control technology of the production process of antimony oxide has been laggard so that it does not satisfy the requirement of the production of high quality of antimony oxide, it is of important realistic significance to reconstruct the control system of the production process of antimony oxide at home.On the basis of the deep analysis of the practical reconstruction project of Guangxi China Antimony Science and Technology Co. Ltd., the researches of the choice of control system, the calibration of controller parameters, the determination of the optimal reaction condition, the design of the hardware and the design of a human-computer interface in the control system are made. The simulations of the single-loop control system and the cascaded-control system are performed, and it is shown that the cascaded-control system can effectively improve the dynamic characteristics of the plant, increase the ability to resist disturbances and has the ability of the self-adaptive control to the changes of the subsidiary loop parameters. In addition, the comparison and study of the several methods of the parameter calibration of PID controllers in the process control in industry are made.The control of the chemical reaction is the basic of the optimal control of the temperature in antimony white furnace, and the key to the control of the chemical reaction is the control of the ratio of air to antimony. There are many factors to affect on that. By analyzing the production process of antimony oxide, the quantity of heat taken in by the eutectic antimony, the quantity of heat got rid of by the high temperature mixture of the antimony and the air, the operation state of the furnace and the disfunctional case of the production process are the main factors to affect on the ratio of air to antimony can be determined. On the basis of the analysis above, the scheme of the combination of the cascaded-control with self search of the optimal point by the variant-step mode is utilized to implement the control of that, thus making the coefficient of the surplus air sustain the optimal value forever.Finally, the design of the automation system by the utilization of configuration software (kingview 6.53) is performed and a friendly human-machine interface is supplied with the user.