Development of Fuzzy Logic Controller for Cement Mill

Abstract

In this paper a fuzzy logic controller is used to control a MIMO (Multiple Input Multiple Output) system. Fuzzy logic controller is used for modeling and solving problems which involves imprecise knowledge and mathematical modelling. Fuzzy sets support many degrees of membership between 0 and 1. The control is provided in order to control the flow rate which in turn affects the rest of the process that follows. Plugging is a major issue which causes instability in cement mills. If proper crushing is not performed fineness of cement will be affected. The temperature inside the rotary kiln determines the quality of cement and the physical properties like fineness, soundness etc are achieved during the milling process. Depending on the ability of cement to set in water it can be classified as hydraulic and non-hydraulic. Quality of cement is determined by mortar compressive strength. Chemical structure, fineness and particle size distribution of finished product have a strong influence on mortar compressive strength. A ball mill circuit can be made to work efficiently and stably with the help of fuzzy logic control. Since cement mill have interconnected processing operations the system is complex. Main difficulty of cement ball mill load is large delay time which is solved using sampling control strategy of fuzzy logic control.