SIMULATION OF A COMBINED-CYCLE POWER-PLANT BASED ON A PRESSURIZED CIRCULATING FLUIDIZED-BED COMBUSTOR

A comprehensive mathematical model for the simulation of a pressurized circulating fluidized bed combustor will be presented. The model cons ists of a combustor model describing the combustion chamber, the cyclo ne and the external heat exchanger as well as of a gas turbine model. The results of the simulation for the combustor at full load and diffe rent pressures and for the combined cycle power plant at full and part load are presented in form of temperature-, flue gas composition- and heat transfer-profiles in the combustor. Especially, energy fluxes fr om the combustor to the water-/steam cycle and the output of gas- and steam-turbine will be shown. The validity of the model will be shown b y comparative simulation of an existing plant for the special case of atmospheric conditions.