Mathematical models and expert system for grate-kiln process of iron ore oxide pellet production. Part II: Rotary kiln process control

Abstract

Rotary kiln process for iron ore oxide pellet production is hard to detect and control. Construction of one-dimensional model of temperature field in rotary kiln was described. And the results lay a solid foundation for online control. Establishment of kiln process control expert system was presented, with maximum temperature of pellet and gas temperature at the feed end as control cores, and interval estimate as control strategy. Software was developed and put into application in a pellet plant. The results show that control guidance of this system is accurate and effective. After production application for nearly one year, the compressive strength and first grade rate of pellet are increased by 86 N and 2.54%, respectively, while FeO content is 0.05% lowered. This system can reveal detailed information of real time kiln process, and provide a powerful tool for online control of pellet production.

Keywords

mathematical model / expert system / one-dimensional temperature field / rotary kiln / iron ore oxide pellet

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