Single shaft combined cycle turbine.

摘要

An improved combined cycle plant with a gas turbine (21), a steam turbine (22) and a generator (24) arranged in tandem on a single shaft system (30) in the order aforementioned, including a single thrust bearing (26) with rigidly coupled rotor members. The thrust bearing for the shaft system is supported in a bearing standard keyed (28) to the foundation on the side of the steam turbine toward the gas turbine to restrain axial movement. The thrust bearing is preferably located in the compressor inlet of the gas turbine. The steam turbine comprises a first casing (44) with the high pressure section (HP) supported in a bearing standard (60) keyed (62) to the foundation adjacent the thrust bearing. The second casing (45) with the low pressure section (LP) is keyed (58) to the foundation at its outlet in the center of the exhaust hood (48). The preferred arrangement has a single flow low pressure turbine section in which the second casing (45) combines an intermediate pressure turbine section adjacent the generator receiving steam from the reheater (38). In a modified arrangement with a double flow low pressure section, the intermediate pressure turbine section is combined with the high pressure turbine section in the first casing.