Integrated steam and air cooling for combined cycle gas turbines

Rotary kinetic fluid motors or pumps – With changing state confined heat exchange mass

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415115, 415 48, 416 96R, 416 96A, 416 97R, 416231R, 60 3954, F01D 518

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052539768

ABSTRACT:
A steam or air-cooled combined cycle gas turbine includes first and second turbine stages and a second nozzle stage disposed about a spacer between the turbine stages. Cooling steam is passed through the nozzle vanes radially inwardly and through the seal between the spacer and the nozzle stage into a pair of chambers. Inlet ports are carried by the first and second-stage turbines for conducting the steam through both single and multi-pass circuits in the turbine blades to cool the blades. Steam is inlet along the axis of the turbine for mixing with the steam inlet past the nozzle stage and spacer seal. Air is inlet adjacent the axis of the turbine and a valve selectively opens and closes an air inlet for admitting air into the chambers. When the turbine is in a start-up mode or steam is not available, the valve is open to admit air into the chambers to supply cooling air to the turbine blades. When steam is available, the valve is closed and the turbine blades are steam cooled.

REFERENCES:
patent: 2750147 (1956-06-01), Smith
patent: 3553712 (1970-10-01), Kercher
patent: 3628885 (1971-12-01), Sidenstick et al.
patent: 4184797 (1980-01-01), Anderson et al.
patent: 4314442 (1982-02-01), Rice
patent: 4514144 (1985-04-01), Lee
patent: 4526512 (1985-07-01), Hook
patent: 4565490 (1986-01-01), Rice
patent: 4820116 (1989-04-01), Hovan et al.
"Future Gas Turbine Development Options Definition Study" Electric Power Research Institute, Jun. 1987.
"Development, Installation . . . Generator", Burnham et al., pp. 1-8, ASME, International Gas Turbine Conference, Dusseldorf, Germany, Jun., 1986.

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