Apparatus for operating a gas turbine in a simple cycle and in a cycle combined with a steam turbine
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United States of America Patent
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Mar 11, 1997
Issued Date -
N/A
app pub date -
Oct 23, 1995
filing date -
Dec 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gas turbine apparatus that can be operated selectively in a simple cycle or in a combined steam turbine cycle increases the efficiency of the installation and provides easy switch-over from the simple cycle to the combined cycle, and at the same time provides for cooling the cooling air for the gas turbine. The gas turbine and waste-heat boiler are connected by a transition piece. A heat exchanger for cooling the cooling air is disposed in a duct connected to the transition piece for introducing a gaseous medium for mixing with the gas turbine exhaust. The gaseous medium cools the cooling air and is accordingly heated. The heated gaseous medium is mixed with the exhaust gas of the turbine, and the mixture directed to the waste heat boiler to generate steam for the steam turbine for operating in the combined cycle. A simply operated duct selectively directs the flow of the mixture. A chimney with a closing flap is positioned on the transition piece between the cooling duct and the waste-heat boiler to selectively direct the mixed gases to the waste-heat boiler or the environment.
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