Abstract
Although there has been great technological development in the computer field, improved cost performance is still required in order to accurately and quickly solve the partial differential equation which represents the complicated dynamics of sliding pressure operation of a supercritical once-through boiler. To obtain the solution using software, the following ideas are proposed in this paper. (1) Pressure and entropy as state variables are chosen to represent dynamics instead of temperature which cannot be independent of pressure in the saturated steam region. (2) The partial differential equation system is transformed into an ordinary one by the characteristic curve method. (3) High speed steam table is introduced instead of the international steam table formula. The simulation methods have been successfully applied not only to build the simulator for control system design but also to model the built-in-simulator of optimal control system.
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