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AssigneeHitachi, Ltd.
InventorsEiji Yanai, Tsuguo Hashimoto, Kiyoshi Takeuchi, Takashi Asao, Yoshiki Noguchi
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In order to recover the heat of the waste gas from a gas turbine, a waste heat recovery boiler is provided, which has a high-pressure steam generating portion consisting of an economizer, a high-pressure steam generator and a superheater, and a low-pressure steam generating portion consisting of an economizer, and a low-pressure steam generator. The steam from the high-pressure generating portion is supplied to the turbine through a high-pressure steam pipe, and the steam from the low-pressure steam generating portion to the same through a low-pressure steam pipe. The high-pressure gland sealing steam is supplied to a high-pressure side steam gland portion the steam turbine through a high-pressure steam extracton pipe branching from the high-pressure steam pipe, a steam pressure regulator adapted to regulate the steam pressure and introduce the excess steam to a condenser, and a high-pressure gland sealing steam pipe. The low-pressure gland sealing steam is supplied to a low-pressure side steam gland portion through a low-pressure steam extraction pipe branching from the low-pressure steam pipe, a reducing valve adapted to supply steam of a constant pressure due to a depressurization operation, and a low-pressure gland sealing steam pipe.
A gland sealing steam supply system for a steam turbine, comprising means for supplying steam to a low pressure gland portion of the steam turbine independently of steam supplied to a high pressure gland portion of the steam turbine, and reducing valve means for depressurizing the steam supplied to said low pressure gland portion.
A gland sealing steam supply system for steam turbines, adapted to supply steam to a gland portion of a steam turbine which is driven by high-pressure steam and low-pressure steam introduced thereinto, comprising a high-pressure steam pipe for use in supplying high-pressure steam to said turbine, a high-pressure steam extraction pipe branching from said high-pressure steam pipe, a high-pressure gland sealing steam pipe connected at its one end to a high-pressure side steam gland portion of said steam turbine, a steam pressure regulator provided between the other end of said high-pressure gland sealing steam pipe and said high-pressure steam extraction pipe and adapted to regulate a steam pressure and introduce excess steam to a condenser, a low-pressure steam pipe for use in supplying low-pressure steam to said turbine, a low-pressure gland sealing steam pipe connected at its one end to a low-pressure side steam gland portion of said steam turbine, and a reducing valve provided between the other end of said low-pressure gland sealing steam pipe and said low-pressure steam extraction pipe and adapted to supply steam of a constant pressure.
Dependencies are inferred from the claim text.