System for reducing nitrogen-oxide emissions from a gas turbine

Power plants – Combustion products used as motive fluid – With variable oxidizer control

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Details

60 3927, 60 3936, F02C 916

Patent

active

052856305

ABSTRACT:
A system for reducing nitrogen oxide emissions from a gas turbine engine is disclosed in which a portion of air in the air compressor is tapped and supplied to an inlet which introduces at least a portion of the tapped air into the primary zone of the combustion chamber. A control device is disposed between the tap and the inlet to control the air flow passing to the inlet. The inlet is located so as to inject the tapped air into the combustion chamber primary zone at the intersection of adjacent fuel sprays. The control device, which may be an adjustable flap valve or a three-way valve, may also be operatively connected to the throttle control for the gas turbine engine such that the control allows the maximum amount of air to pass into the combustion chamber under full power conditions. The control device is preferably mounted outside the engine casing enclosing the combustion chamber to allow easy access for assembly and maintenance.

REFERENCES:
patent: 2770096 (1956-11-01), Fox
patent: 3705492 (1972-12-01), Vickers
patent: 3842597 (1974-10-01), Ehrich
patent: 3952501 (1976-04-01), Saintsbury
patent: 4138842 (1979-02-01), Zwick
patent: 4255927 (1981-03-01), Johnson et al.

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