A mathematical model for a combined cycle power plant process -- Interactions between the pressurized circulating fluidized bed combustor, the water/steam cycle and the gas turbine

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:357852

Petermann, A; Fett, F N ^[1]

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1. Univ. of Siegen (Germany). Inst. fuer Energietechnik

A comprehensive mathematical model for the simulation of the steady state behavior of a combined cycle power plant will be presented. This combined cycle consists of the subsystems pressurized circulating fluidized bed combustor (PCFBC), complete water/steam cycle and gas turbine. Due to the complexity of such a plant there are a number of interactions between the single components which influence power output, efficiency and emissions of the combined cycle. The model is based on a power plant concept used to build a pilot power plant with an electrical load of 150 MW and a net efficiency of 45%. The PCFBC consists of a combustion chamber (CC), a cyclone and a newly designed external fluidized bed heat exchanger. The steam generator system is a once-through forced flow unit (Benson-Boiler). A single shaft gas turbine is used to supply the system with pressurized air and to expand the flue gas. The fuel is hard coal. Each subsystem is described by a set of algebraic differential equations that are solved by a Newton-Raphson method. An emphasis is laid on the operation of the plant at different loads under characterizing the interactions between combustor, water/steam cycle and gas turbine.

• OSTI ID: 357852
• Report Number(s): CONF-9705116--; ISBN 0-7918-1557-9
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
ANTHRACITE
CIRCULATING SYSTEMS
COMBINED-CYCLE POWER PLANTS
CYCLONE SEPARATORS
FLUIDIZED-BED COMBUSTORS
GAS TURBINES
HEAT EXCHANGERS
MATHEMATICAL MODELS
PRESSURIZATION
STEAM GENERATORS