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1. (WO2018144006) METHOD FOR NORMALIZING FUEL-AIR MIXTURE WITHIN A COMBUSTOR

Pub. No.:    WO/2018/144006    International Application No.:    PCT/US2017/016391
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Sat Feb 04 00:59:59 CET 2017
IPC: F23R 3/28
F23R 3/34
F23R 3/00
Applicants: SIEMENS AKTIENGESELLSCHAFT
SIEMENS CANADA LIMITED
SIEMENS ENERGY, INC.
Inventors: BOURGUE, Gilles
Title: METHOD FOR NORMALIZING FUEL-AIR MIXTURE WITHIN A COMBUSTOR
Abstract:
A desired steady-state, fuel-air ratio of a fuel and air mixture is normalized within a combustor (100) for a combustion turbine engine, by selectively varying, at any location about the three-dimensional volume (160) within its premixer structure (150), the dimensions and/ or profile of one or more passages which comprise air ducts (162), fuel delivery passages (114), fuel and air mixing ducts (108), and/or fuel and air discharge ducts (110). Selective local variation of such passage profiles and dimensions within the premixer compensates for localized variations or temporal fluctuations in compressed air supply to the premixer, and/or combustion gas backpressure upstream into the premixer, and/or combustion gas mass flow in the combustion chamber of the combustor. When the premixer passages are configured to normalize the desired fuel-air ratio within the combustor, the premixer is manufactured as a monolithic, three- dimensional lattice structure of selectively oriented, asymmetrical- and serpentine-shaped metallic webs, which incorporate those desired passage configurations.