Expert System for Control Guidance of Grate-Kiln Pellet Production

Abstract

The characteristics of large-scale equipments, continuous process, close system and severe environment make grate-kiln process hard for parameter detection and difficult to control. The accuracy and normalization of grate-kiln process control need to be improved. Therefore, an expert system providing real time control guidance for grate-kiln pellet production is presented. The “roasting temperature of pellet in kiln & gas temperature in gas hood of preheating section” dominated control strategy is put forward and control rules for grate-kiln process are established based on expertise. A multistage reasoning strategy of “parameter status estimation – reason analysis – adjustment measure selection” is developed and forward reasoning is adopted. The application of software, which is programmed with Visual C++, is outlined. The results show that, with the assistance of expert system, stability rate of grate-kiln pellet production is increased from 91.0% to 94.2%, FeO content of finished pellet is 0.05% lower, compressive strength is 86 N.pellet^–1 higher, first grade rate of pellet is increased by 2.54%.