Power plants – Combustion products used as motive fluid
Patent
1994-12-28
1996-12-17
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
60 3927, F02C 950
Patent
active
055841716
ABSTRACT:
A gas turbine engine control method and apparatus as disclosed for optimizing fuel/air mixture, especially during decreasing load conditions. In a large capacity gas turbine engine system used for generation of electric power, the system is designed to operate at a relatively constant rotational speed of the turbine which drives an electric generator unit. The load of the turbine engine varies throughout the day due to changes in electrical power demands. During normal rated load conditions, the control of the fuel/air mixture is by way of changes in fuel supply, corrected to return the turbine exhaust temperature to a desired rated temperature. During this mode of operation, the compressor inlet guide vanes are maintained in a substantially constant open position. For accommodating decreasing load conditions where the temperature drops below a predetermined temperature level below the rated temperature operation, the system is switched to an inlet guide vane control mode of operation. During the guide vane control mode of operation, the inlet guide vanes are controlled at a more precise temperature correction sensitivity than is the case for normal load operations. This more precise inlet guide vane control during decreasing load conditions assures improved fuel/air mixture during decreasing load and consequent improved efficiency and minimal NO.sub.x compound emissions, especially during changing ambient temperature conditions where cold air would otherwise increase the air supply.
REFERENCES:
patent: 4178754 (1979-12-01), Earnest
patent: 4299088 (1981-11-01), Rowen et al.
patent: 4529887 (1985-07-01), Johnson
patent: 4550565 (1985-11-01), Ozono et al.
Hirose Fumiyuki
Ikeda Hiraku
Sato Isao
Shimura Akira
Takaba Minoru
Casaregola Louis J.
Hitachi , Ltd.
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