抄録
A super critical boiler is necessarily of an once-through type. Generally this type is able to respond swiftly to load changes, and has a small heat capacity. Therefore the boiler and the turbine should be operated in coordination. Especially in the start-up period, the computer control system may be needed, and for the rise-up control of the temperature and pressure a DDC (Direct digital control) system would be preferable.
In this paper, a rise-up DDC algorithm of the water wall outlet fluid temperature is proposed and the control performance is checked by the use of a digital simulator of combined circulation boiler (1950ton/hour).
A remarkable characteristic of this control algorithm is that it contains the identification of the boiler dynamics and by the results of the estimation the control parameters can be automatically adjusted. Hence we would be able to leave out a prior setting of such parameters which is usually done by the use of the simulator or the real plant.
