| The background of this paper is a Calcium Carbide furnace project in Shanxi Province. Based on the functional requirements proposed by the project such as Electrode lift control, Electrode slipping control, Parameters display, a control system with PLC was designed to reduce the energy consumption and release the labor intensity. To solve problems of three-phase current in the three-phase electrode lift system, such as strong coupling, high sensitivity, difficult to adjust, improved PID control and Fuzzy control were put forward in the dissertation.To begin with, the principle and flow of the Calcium Carbide furnace production were introduced. Furthermore, the control system was designed, the hardware of the system is selected and installed, and then the PLC software and monitoring software with WinCC in the PC were finished. Moreover, the improved PID algorithm with dead zone were proposed, based on which the electrode lift system was designed, and then the corresponding design methods of Electrode Pulse Controller were brought out. Of course, relative PLC program designing, debugging and application were also completed. Finally, the method of off-line Fuzzy Control Table based on PLC was also proposed, based on which the electrode lift system was designed, and the relative PLC program was also designed, debugged and applied.The Calcium Carbide furnace control system has been put into practice, which releases the labor intensity, enhances the stability of electrode current, improves the automation level of Calcium Carbide production, and realizes the ultimate objects of energy saving and productivity increase. |
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