Abstract
This paper presents a PID-based ratio control scheme for flue gas cleaning systems (FGCSs) to remove acid emissions ( SO X and HCl) from municipal refuse incinerators. The FGCS uses a semi-dry scrubber that injects diluted hydrated lime ( Ca ( OH ) 2 ) droplets to scrub high temperature, polluted flue gas from incinerators. The development of the control scheme was initiated by treating the scrubbing process as a grey system perceived as conceptual chemical dynamics. The scheme was implemented on a redundant programmable logic controller (PLC) and the control parameters were tuned based on responses from commissioning operations. The scheme, never re-tuned, has accomplished promising performance and consumable savings since its commission in the year 2000.
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