A physically based boiler model is developed to solve a set of optimization problems. The model evaluates the normal operation of a 235 MW gas/oil boiler. The model has 7 states in the process and 25 states in the control system. The boiler has a two stage superheater, a single stage reheater and an economizer. The designed steam pressure is 1815 psia with both superheat and reheat temperatures of 1000 deg F. The model is used to solve the optimal set-point scheduling problem in the boiler system. This paper discusses the boiler process state space model.
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