ADVANCED CONTROL METHOD APPLIED TO CEMENT INDUSTRY

Abstract

A mathematical model of heat transfer around the preheater tower in dry process in cement industry has been developed. A description of automatic control system of the preheater-kiln process by using fuzzy control is given. The model describes the energy balance of each preheater stage. Relevant temperatures of the preheater tower (gas and dust) as well as those inside the cyclone (unmeasured) can be attained via this model. In addition, cyclone clogging diagnosis has been undertaken using two types of the advanced control. The first is the fuzzy controller which can .reach the normal temperature values inside the cyclones with a minimum material feed. The second is the clog removal expert system which avoids the occurrence of clogging faults early. A dedicated expert diagnosis system presents to enhance the performance of the preheater tower by detecting the position of the prime clog early and select the proper solution to remove it by means of direct air cannons at the place of the prime clog only (not all cannons), and adjust the bypass ratio of the kiln gas automatically