Abstract
Systematic control system design for process furnaces with multiple parallel tube passes is addressed. The control objectives are to regulate furnace outlet temperature while holding the temperature rise across the individual tubes to be the same (tube pass heat load balancing). With respect furnace throughput (Ftot), two operating scenarios are considered; 1. Ftot is held constant and (ii) short term transient variability in Ftot is acceptable. Alternative systems, CS1-CS3, are synthesized and quantitatively evaluated for their closed loop dynamic performance to expected load/servo changes. The Scenario 1 heat load balancing problem is shown to exhibit strong multivariable dynamic interaction and the control benefit of dynamic matrix control is quantified. Based on the results, recommendations are made on the suitability of the alternative control systems in industrial settings.
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