Combined gas turbine-rankine turbine power plant
First Claim
1. A powerplant having a combined gas turbine engine and Rankine turbine engine, said powerplant comprisinga gas turbine engine comprising a compressor, a gas turbine, and a burner and ambient air supply assembly for delivering air from the compressor and products of combustion from the burner to said gas turbine,a closed loop Rankine turbine engine comprising a vapor generator, a Rankine turbine, a desuperheater, a condenser and a liquid feed pump, said vapor generator heated by the exhaust of said gas turbine and delivering heat to the Rankine fluid for powering said Rankine turbine,means for directing air through said desuperheater and toward said compressor, andvalve means upstream of said compressor for selectively introducing said heated air from said desuperheater into said compressor.
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Abstract
A combined gas turbine-Rankine cycle powerplant with improved part load efficiency is disclosed. The powerplant has a gas turbine with an organic fluid Rankine bottoming cycle which features an inter-cycle regenerator acting between the superheated vapor leaving the Rankine turbine and the compressor inlet air. The regenerator is used selectively as engine power level is reduced below maximum rated power.
88 Citations
24 Claims
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1. A powerplant having a combined gas turbine engine and Rankine turbine engine, said powerplant comprising
a gas turbine engine comprising a compressor, a gas turbine, and a burner and ambient air supply assembly for delivering air from the compressor and products of combustion from the burner to said gas turbine, a closed loop Rankine turbine engine comprising a vapor generator, a Rankine turbine, a desuperheater, a condenser and a liquid feed pump, said vapor generator heated by the exhaust of said gas turbine and delivering heat to the Rankine fluid for powering said Rankine turbine, means for directing air through said desuperheater and toward said compressor, and valve means upstream of said compressor for selectively introducing said heated air from said desuperheater into said compressor.
- 10. An engine comprising in combination a main power turbine having an inlet and an exhaust, a compressor having an inlet and an outlet, valve means positioned upstream of said compressor for introducing ambient air into said compressor inlet, a combustion chamber situated adjacent said compressor and said main power turbine, said compressor and combustion chamber supplying the main power turbine with ambient air and products of combustion to power the same, an expansion turbine having an inlet and an outlet, a closed-loop Rankine cycle system for powering said expansion turbine, said Rankine cycle system using a working fluid, a vapor generator in said Rankine cycle system positioned to absorb heat from the exhaust of said main power turbine and connected to the inlet of said expansion turbine to deliver thereto working fluid vaporized in said vapor generator, a desuperheater connected to the outlet of said expansion turbine for transferring heat from said working fluid into air passing through said desuperheater, and a condenser and feed pump positioned in operating relationship with said desuperheater for condensing said working fluid and returning it to said vapor generator, said valve means selectively introducing said air passing through said desuperheater and heated thereby into said compressor inlet.
- 20. An engine comprising in combination a power turbine, a compressor, a burner and ambient air supply for delivering air from the compressor and products of combustion from the burner to said power turbine, a Rankine turbine, a first intercycle heat exchanger heated by the exhaust of said power turbine and delivering heat to the Rankine fluid upstream of said Rankine turbine, a closed-loop Rankine cycle system for powering said Rankine turbine, a second intercycle heat exchanger positioned in said Rankine cycle system for delivering heat to air passing through said second intercycle heat exchanger, first valve means and a second valve means, said first valve means recirculating a portion of said power turbine exhaust gases into said second valve means, said second valve means selectively introducing said ambient air, said heated air from said second intercycle heat exchanger, and said portion of said exhaust gases into said compressor.
Specification