Design And Implementation Of Intelligent Control System Of The Large Pre-baked Aluminum Electrolysis Process

The productional practice of large-scale prebaked aluminum electrolytic cells has shown that the well technical conditions is decisive to obtain good technical and economic indexes, such as current efficiency, energy consumption per ton aluminum, etc.. According to the 200kA prebaked aluminum electrolytic cell in our country, and aiming at the new new technical conditions, i.e. "Four Low One High", this parper designs and develops a intelligent control system for electrolysis process.In order to keep large-scale prebaked aluminum electrolytic cells running steadily under the new technical conditions, this paper put forward a fuzzy expert controlling strategy, which combineing with'the fuzzy control technology and the expert control technoloy, and making use of the aluminum electrolysis experts' experience and knowledge adequately, develops a aluminum electrolysis fuzzy expert controller.' ' Apply this fuzzy expert controller to deal with the knowledge of precise ?and fuzzy and excute the precise inference and fuzzy inference at the same time. In the design of fuzzy expert controller, put forward a data pretreatment algorithm with strong noise resistance, it provides the condition for the high control performance. And aiming at the problem of aluminum electrolysis anode effect, this paper brings forward a prevention method of fuzzy expert control, and guarantees the stable electrolytic cell operateing in the new technical condition of low Al2O3 concentration and low anode effect frequency. The actual running result of 200kA prebaked aluminum electrolytic potline in our country shows that the process control of aluminum electrolytic having high control precision, strong robustness and stableness, and can increase more than 2% in current efficiency and decrease lOOkWh in electric energy consumption per ton aluminum.The control software for aluminum electrolytic cells was developed in this paper with Visual Basic 6.0. This software consists of the functions of data management and organization, file storage, report form printing,control parameter modification, curve display, and cell state analysis, etc., with modular structure, and improves the level of supervision and control of the potline production.