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AssigneeKabushiki Kaisha Toshiba
InventorsMorikazu Kitazawa, Masataka Kikuchi, Kazuo Aoyagi, Nobuo Okita, Hiroyuki Oohira
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The present invention solves problems of securing high-temperature strength at elevated temperatures and of preventing steam leakage that arise when high-pressure, high-temperature steam is used for driving a steam turbine, and problems of preventing the occurrence of rubbing due to the suppression of the excessive elongation difference and of minimizing steam leakage from shaft seals. A double-wall casing structure is arranged at an area corresponding to stages from a high-pressure first stage (7) to a predetermined high-pressure stage arranged on an upstream side of a high-pressure final stage (8); and a single-wall casing structure is arranged at an area corresponding to stages which follows said predetermined high-pressure stage.
(Amended) an axial-flow steam turbine comprising a high-pressure section provided with a turbine casing, said turbine casing having:
An axial-flow steam turbine comprising a high-pressure section and an intermediate-pressure section, wherein steam discharged from said high-pressure section is reheated by a steam reheater, and the steam thus reheated is supplied to said intermediate-pressure section,
Dependencies are inferred from the claim text.