Optimising Combined Cycle with One or Two Steam Pressure Levels and Heat Recovery Generator with Imposed Transfer Area

摘要

The paper treats about optimising the combined cycles with heat recovery systems having one or two steam pressure levels,without reheat.The thermodynamic target is maximising the electrical output without growing the steam generators heat transfer area.This thermodynamical approach takes into consideration the economical aspect by this kind of indirect investment restriction.The gas turbines being choosed from the producer's directories,the target became maximising the electrical output generated by the steam turbine.The mathematical model covers the whole combined cycle installation's in their coupling.It put into evidence the presence of one optimal pressure or a couple of two optimal pressures which offer the thermoeconomical optimum.In the paper the authors make an economical optimisation for the heat recovery steam generator with one pressure level.