Power plants – Combustion products used as motive fluid – With addition of steam and/or water
Patent
1996-02-12
1998-06-30
Freay, Charles G
Power plants
Combustion products used as motive fluid
With addition of steam and/or water
60 3915, 60 39182, 60 393, F02C 700
Patent
active
057716781
ABSTRACT:
A gas turbine engine having an air compressor and a combustion chamber connected to the air compressor for burning fuel with air from the air compressor. The combustion chamber also has water and/or steam as input. The water and/or steam is combined with the gases generated by the burning of the fuel to generate a gaseous output that drives first and second turbines. A heat recovery system recovers heat and water from the gaseous output after the gaseous output has passed through the turbines. The water is used as the water source for the combustion chamber and for cooling the turbines. In the preferred embodiment of the present invention, the heat recovery system utilizes a supercritical heat exchanger. Some of the recovered heat is preferably utilized to drive a third expander. In systems designed to accommodate a variable load, the preferred embodiment of an engine according to the present invention includes a device for regulating the fraction of the gaseous output from the combustion system that passes through the second turbine. In the preferred embodiment of the present invention, the device is a valve or variable geometry inlet nozzle blades in the second turbine. The valve preferably operates by regulating the back-pressure to which the second turbine is subjected. Alternatively, the variable load may be accommodated by utilizing separate combustion chambers for the two turbines and regulating the rate of fuel consumption in one or both of the combustion chambers. A conventional gas turbine engine may be converted to a turbine according to the present invention by adding a second turbine of the same capacity as the existing turbine and a heat recovery system and by modifying the combustion chamber to accept a water input.
REFERENCES:
patent: 2547093 (1951-04-01), Ray
patent: 2554593 (1951-05-01), Sedille
patent: 4387562 (1983-06-01), Takao et al.
patent: 4680927 (1987-07-01), Cheng
patent: 5303544 (1994-04-01), Kobayashi et al.
patent: 5357741 (1994-10-01), Talabisco et al.
Freay Charles G
Ward Calvin B.
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