Mathematical modeling and dynamic simulation of intermediate point temperature for ultra-supercritical once-through boiler I

This paper chose Dongfang 1000 MW ultra-supercritical units as the research object, according to mass conservation, energy conservation and the metal thermal equilibrium principle, etc, establish intermediate point enthalpy mechanism model in different working conditions. Lumped parameter segmentation method is used during the modelling process, and with the method of linearization and deviation, the corresponding transfer function is obtained, and transfer into matrix forms for expression at last. The mechanism mathematical model obtained in the paper can reflect the dynamic characteristics of once-through boiler unit under research conditions to a certain extent.