ITERATIVE LEARNING CONTROL OF HEAT-UP PHASE FOR A BATCH POLYMERIZATION REACTOR

This paper describes a novel method for heat-up phase control of an in dustrial batch polymerization reactor where heat transfer characterist ics change with batches due to fouling of the polymer products on the reactor wall. The main objective of the control is to settle the react or temperature on a target value within +/- 0.1 degrees C in a minimum possible time. To achieve this goal utilizing the repetitive nature o f batch operation, the control problem was defined as a tracking probl em and feedback-assisted iterative learning control (FBALC) was employ ed as the underlying control technique. The proposed control method wa s applied to an industrial batch reactor polymerizing ABS resin. After on-site evaluation for an extended period of time, it was found that the proposed method gives a pronounced improvement in heat-up phase op eration. Consistent heat-up profiles with a minimized settling time ar e obtained.