Turbine and operating method of the same

摘要

According to one embodiment, there is provided a single-flow turbine (2) using CO 2 as a working fluid. The turbine (2) includes a balance piston portion (18) configured to optimize an axial load of a rotor (11) on a bearing (J1, J2) with a fluid having a temperature lower than a temperature of the working fluid introduced into the turbine (2), wherein a flow path in which at least a part of the fluid passing through the balance piston portion (18) is extracted from a middle part of the passing, and in which at least a part of the extracted fluid is urged to flow to a middle part of a passage where the working fluid passes and where rotor blades (14) at a plurality of stages are provided, is formed at the turbine (2).