Hitachi, Ltd.

Hiroyuki Arai

Yasuyuki Watanabe

Shigeru Azuhata

Nobuyuki Iizuka

Nariyoshi Kobayashi

Haruo Urushidani

Kazuyuki Ito

Yasutaka Komatsu

Masaya Ohtsuka

A gas turbine combustor having a fuel injection nozzle for diffusion combustion disposed in a central portion of the combustor and an annular premixed nozzle disposed in an outer peripheral portion of the fuel injection nozzle for injecting a mixed gas of fuel and air. The annular premixed nozzle includes an annular premixing chamber and a plurality of premixed fuel nozzles for injecting fuel into the annular premixing chamber. The annular premix nozzle is divided by a partition (108) to form a plurality of premixing chambers each adjacent to the fuel injection nozzle for diffusion combustion. Each of the premixing chambers includes at least one of the premixed fuel nozzles. A mechanism is provided for supplying fuel to a predetermined number of the premixing chambers in a low load operation of the gas turbine and for supplying fuel to all of the premixing chambers in a high load operation.

Gas turbine combustor and operation method thereof for a diffussion

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Hitachi, Japan

Hiroyuki Arai