Mitsubishi Heavy Industries Limited

Takeaki Oya

Kazuharu Hirokawa

Tadateru Tanioka

Katsunori Tanaka

Kazuo Uematsu

Tanehiro Shinohara

Nobuhiro Kunitake

A shaft structure of a rotor tail end of a gas turbine in which a steam passage for supplying and recovering a steam for cooling rotor blades of the gas turbine extends along a center axis of the rotor assembly of the gas turbine is provided, wherein a center hole of the rotor tail end coaxial to the center axis of the steam passage is formed in the rotor tail end. Provision is also made of a thermal sleeve between the steam passage and the inner surface of the center hole of the rotor tail end, so that a thermal insulation gas layer is formed between the inner surface of the center hole of the rotor tail end and the thermal sleeve. The thermal insulation gas layer is isolated gas-tightly and liquid-tightly from the outside.

Shaft structure and bearing structure for tail end of rotor of gas turbine

Gas turbine steam passage seal structure between a blade ring and a stationary blade absorbs thermal deformation to prevent occurrence of minute gaps to thereby reduce leakage of steam as cooling medium. A blade ring steam passage hole, provided in the blade ring ( ), has a stepped portion formed in a middle portion thereof. A stationary blade steam passage hole, provided in the stationary blade ( ) so as to oppose the blade ring steam passage hole, has a stepped portion formed in an outer peripheral portion thereof. A cooling steam supply passage connection portion is constructed comprising a seal pipe ( ) provided between the blade ring and stationary blade steam passage holes so as to communicate them with each other and a seal urging guide device ( ) provided at each of the stepped portions of the blade ring and stationary blade steam passage holes so as to effect a seal while fixedly supporting the seal pipe ( ). Leakage of the steam is reduced, temperature lowering of combustion gas is prevented, drive force of a steam turbine is increased and the entire thermal efficiency of the combined cycle power plant can be enhanced.

Gas turbine steam passage seal structure between blade ring and stationary blade

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Takasago, Japan

Takeaki Oya