Abstract
In this paper a novel ratio control scheme is proposed for fluid catalytic cracking unit. Based on a developed mathematical model, the dynamic simulator of a fluid catalytic unit is used to implement two schemes of ratio controller. The performance of the control scheme proposed here is tested using integral Absolut error. The results of simulation are successfully compared with the plant data. Comparison with PI controller, the ratio controller scheme one in maintaining controlled variables is very close to their set points. Here, with an application to a FCC unit of ratio control scheme one results obtained is found to be acceptable and it would be effectively used for improved process control of FCC in refinery process industry.
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