ECN publicatie:
Enhancing direct-fired power plants performance by the use of gas turbine technology
Gepubliceerd door: Publicatie datum:
ECN 1-9-1998
ECN publicatienummer: Publicatie type:
ECN-RX--98-051 Artikel wetenschap tijdschrift
Aantal pagina's:

Gepubliceerd in: Keynote lecture at the 2nd International symposium on advanced energy conversion systems and related technologies RAN '98, Nagoy (), , , Vol., p.-.

The maximum temperature of a gas turbine cycle is considerably higherthat that of a steam turbine cycle; however, the gas turbine rejects heat at temperatures far above the ambient level. By combining the high-temperature gas turbine cycle with the medium-temperature steam cycle, a high overall efficiency can be reached. Modern combined-cycle plants obtain an LHV efficiency of almost 60% with relatively moderate parameters of the steam bottoming cycle, while direct-fired steam plants with supercritical pressures and temperatures still operate under the 50% efficiency level. This paper addresses ways of improving the performance of direct-fired steam plants by integrating a gas turbine within an existing steam plant. These include utilization of the gas turbine exhaust as a heating medium, combustion air, and as fuel. Repowering schemes for a waste incineration plant are given, along with repowering by the use of a partial oxidation gas turbine and an externally-fired gas turbine. The results of a performance analysis are presented. 22 refs.

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