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This paper describes a new nonlinear dynamic model for a natural circulationboiler. The model is based on physical principles, i.e. mass, energy andmomentum balances. A systematic approach is followed leading to new insightsinto the physics of drum water level and downcomer mass flow. The modelcaptures fast dynamic responses that are necessary to describe the operation ofa boiler under highly variable load conditions. New features of the modelinclude (i) a multi-compartment model for the risers, (ii) a new model for drumwater level, and (iii) a new dynamic model for the flow of water in thedowncomers. Implications of the model for control system design are explored indetail. Finally, the suggested improvements are validated in a sugar millboiler.

Novel Modelling and Control Strategies for a Steam Boiler under Fast Load Dynamics