초록 ▼

An apparatus and method of applying active, closed loop control to reduce combustion driven pressure oscillation in a single or multi-chamber combustion system in an industrial gas turbine, to increase operability and life of the parts, and in such a way as to require minimal input power. The invent

An apparatus and method of applying active, closed loop control to reduce combustion driven pressure oscillation in a single or multi-chamber combustion system in an industrial gas turbine, to increase operability and life of the parts, and in such a way as to require minimal input power. The invention combines the passive control of a two stage nozzle with active control thereby to reduce the requirements on the control device. This allows selection of a control device which will have an adequate life in an industrial environment and yet require minimal input power.

대표청구항 ▼

[What is claimed is:] [1.]supplying air from an air supply system through at least one opening into the premixer zone of the combustor, said air having a predetermined pressure upstream of said opening;supplying fuel from a fuel supply system, including a nozzle having a fuel passage and a discharge

[What is claimed is:] [1.]supplying air from an air supply system through at least one opening into the premixer zone of the combustor, said air having a predetermined pressure upstream of said opening;supplying fuel from a fuel supply system, including a nozzle having a fuel passage and a discharge orifice for delivering said fuel, into the premixer zone of the combustor;reducing the pressure of said fuel upstream of said fuel discharge orifice to approximately said predetermined pressure, said air supply opening and said fuel discharge orifice having substantially the same pressure drop;sensing at least one of pressure, temperature and velocity fluctuations in said reaction zone and generating a feedback signal; andactuating a control device operatively coupled to said fuel passage downstream from a locus of said pressure reduction and upstream of said fuel discharge orifice to affect fuel flow therein in response to said feedback signal,whereby pressure fluctuations in the premixer zone resulting from fuel/air concentration oscillations are substantially minimized or eliminated.