Method and apparatus for reducing nitrous oxide emissions from c

Details Method and apparatus for reducing nitrous oxide emissions from c Method and apparatus for reducing nitrous oxide emissions from c

1978-01-19

1980-09-16

Garrett, Robert E.

Power plants

Combustion products used as motive fluid

Combustion products generator

60746, 60748, F02C 722

Patent

active

042222320

ABSTRACT:
An improved combustor for a gas turbine engine is disclosed. Techniques for reducing the level of noxious pollutants emitted by the combustor are developed. In one embodiment, a combination of serpentine geometried, fuel-mixing tubes discharging to the radially outward area of the combustor and an axially oriented, fuel-mixing tube near the center of the combustor are adapted to generate a strong centrifugal force field within the combustor by swirling the fuel/air mixtures flowing therethrough. The force field promotes rapid mixing and combustion within the chamber to reduce both the magnitude of the combustor temperature and the period of exposure of the medium gases to that temperature. The tube at the center of the combustor is adapted to swirl the medium flowing therefrom in a circumferential direction counter to the direction in which the medium from the serpentine geometried tubes is swirled.
In accordance with the method taught, the fuel/air ratio in the serpentine mixing tubes is maintained within the range of fifty to seventy-five percent (50-75%) of the stoichiometric fuel/air ratio for the fuel employed and the fuel/air ratio in the axial mixing tube is maintained at a value less than seventy-five percent (75%) of the stoichiometric fuel/air ratio for the fuel employed.

REFERENCES:
patent: 2931174 (1960-04-01), Allen
patent: 3722216 (1973-03-01), Bahr et al.
patent: 3973390 (1976-08-01), Jeroszko
patent: 3976420 (1976-08-01), Takahashi et al.
patent: 4052844 (1977-10-01), Caruel et al.
patent: 4058977 (1977-11-01), Markowski et al.

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