Patent ID: 6070410
Filing Date: 2000-06-06
Classification: F23D,F23R

Abstract:
A pre-mixer for pre-mixing a liquid fuel and compressed air for flow to a gas turbine engine low Nox combustion chamber for combustion absent steam or water injection and atomizing air, said pre-mixer comprising:a tubular shroud having an inlet at one end thereof for receiving said compressed air, and an outlet at an opposite end thereof;a centerbody having an outer surface and disposed coaxially in said shroud and spaced radially inward therefrom to define a flow channel from said shroud inlet to said shroud outlet;a plurality of fuel injection orifices spaced circumferentially apart around said centerbody and each having an outlet being substantially flush with said centerbody outer surface;a fuel supply circuit extending in said centerbody in flow communication with said fuel injection orifices for supplying said liquid fuel to said orifices for discharge therefrom into said flow channel for pre-mixing said fuel with said compressed air prior to discharge from said shroud outlet and into said gas turbine engine low Nox combustion chamber for combustion absent steam or water injection and atomizing air;wherein said fuel supply comprises an annular manifold disposed in said centerbody in flow communication with said fuel injection orifices, a center bore extending in said centerbody for channeling said fuel, and a plurality of fuel spokes extending radially outwardly from said center bore to said manifold for distributing said fuel to said manifold and;wherein said fuel injection orifices are inclined at an acute angle with respect to said centerbody outer surface for injecting said fuel toward said shroud inlet to increase differential mixing velocity with said compressed air.