Power plants – Combustion products used as motive fluid
Patent
1993-06-01
1994-11-01
Bertsch, Richard A.
Power plants
Combustion products used as motive fluid
60 39463, 60737, 60742, 60748, F02C 726
Patent
active
053598474
ABSTRACT:
An ultra-low NOx gas turbine combustor having a dual fuel capability. The combustor has a pre-mixing zone and a downstream combustion zone. The pre-mixing zone has three concentric annular passages that surround a central diffusion-type dual fuel nozzle. A gas fuel manifold distributes gas fuel around the inner and outer passages. A plurality of dual fuel nozzles are disposed in the middle passage to distribute either gas or oil fuel around the middle passage. The distribution of fuel around the passages allows the formation of lean fuel/air ratios, thereby lowering NOx formation. In addition, swirl vanes are arrayed around the inner and outer passages and around each of the fuel nozzles. A step increase in the flow area in going from the pre-mixing zone to the combustion zone creates vortices that tend to anchor the flame.
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D. Owen et al., "Low Emissions Combustor Design Options for an Aero Derived Industrial Gas Turbine", Canadian Gas Assoc. Symposium, Banff, Alberta (Oct. 16-18, 1991).
Foss David T.
Pillsbury Paul W.
Bertsch Richard A.
Thorpe Timothy S.
Westinghouse Electric Corporation
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