A steam turbine plant and an operating method thereof, and a combined cycle plant and an operating method thereof, include: a turbine; steam supply lines that supply main steam to the turbine; a steam control valve and an intercept valve provided to the steam supply lines; and a first auxiliary steam supply line that supplies auxiliary steam to the turbine via the steam supply lines which are located farther downstream than the steam control valve and the intercept valve.

A gas turbine combined-cycle power plant comprising a gas turbine engine comprising a compressor for generating compressed air, a combustor that can receive a fuel and the compressed air to produce combustion gas and a turbine for receiving the combustion gas and generating exhaust gas; a heat recovery steam generator for generating steam from water utilizing heat from the exhaust gas; a steam turbine for producing power from the steam generated by the heat recovery steam generator; a fuel regasification and expansion system in fluid communication with and disposed downstream of the fuel regasification and expansion system for producing power from gasified fuel; and a fuel expansion turbine in fluid communication with and disposed downstream of the fuel regasification and expansion system for producing power from gasified fuel. In examples, the power plant can include an Organic Rankine Cycle (ORC) using heat input from the heat recovery steam generator. The ORC can utilize a recupertor to redistribute heat within the ORC.

A steam turbine system (200) includes a steam turbine (60) in which a main flow path (C) through which a main steam flows is formed, and a saturated steam generation portion (210) that is configured to generate a saturated steam. The saturated steam generation portion (210) is configured to feed the saturated steam into a wet region (C1) in which the main steam in the main flow path (C) is in a wet state via a hollow portion formed inside a stator vane (650) of the steam turbine (60). The stator vane (650) has a plurality of supply ports that are formed such that the hollow portion is configured to communicate with the main flow path (C), and a discharge amount of the saturated steam increases from an inner circumferential side toward an outer circumferential side in a blade height direction.

The present application provides a turbine with a flow of steam therethrough. The turbine may include a first guide blade, a second guide blade, a flow path for the flow of steam therebetween, and a fluidic flow control device. The fluidic flow control device may include a bypass line for a portion of the flow of steam and an injection port for injecting the portion of the flow of steam into the flow path.

A steam turbine system (200) includes a steam turbine (60) in which a main flow path (C) through which a main steam flows is formed, and a saturated steam generation portion (210) that is configured to generate a saturated steam. The saturated steam generation portion (210) is configured to feed the saturated steam into a wet region (C1) in which the main steam in the main flow path (C) is in a wet state via a hollow portion formed inside a stator vane (650) of the steam turbine (60). The stator vane (650) has a plurality of supply ports that are formed such that the hollow portion is configured to communicate with the main flow path (C), and a discharge amount of the saturated steam increases from an inner circumferential side toward an outer circumferential side in a blade height direction.

A power production facility comprises a combined cycle power plant comprising a gas turbine engine configured to compress air for combustion with a fuel in a combustor to produce exhaust gas that can be used to produce rotational shaft power for generating electricity and a steam system configured to produce steam from water with the exhaust gas to rotate a steam turbine for generating additional electricity, an electrolyzer configured to generate H2 and O2, wherein the electrolyzer is configured to provide the H2 to the combustor for combustion and the O2 to portions of the gas turbine engine, and a heat exchanger configured to receive the O2 and fluid from the steam system and to heat the O2 before passing the O2 into portions of the gas turbine engine.

The invention relates to a method for operating a combined cycle power plant, which includes a steam turbine powertrain with a high-pressure steam turbine, an intermediate pressure steam turbine and a low-pressure steam turbine, whereby intermediate pressure steam flowing from the exit of the high-pressure steam turbine to the inlet of the intermediate pressure steam turbine is reheated by means of the reheat device, and which is connected to a solar thermal plant, that generates additional solar steam for being used by said steam turbine powertrain. The output of the solar steam generator is used more effectively, and the overall plant performance, flexibility and operability are enhanced by at least part of the additional solar steam reaching the intermediate pressure steam turbine without being reheated in said reheat device.

A steam turbine plant of one embodiment includes at least one heater configured to change water into steam to produce high pressure steam and low pressure steam having a lower pressure than the high pressure steam, a high pressure turbine including a turbine or turbines connected to each other in series, and having a first inlet to supply the high pressure steam, a second inlet to supply the low pressure steam and located at a downstream of the first inlet, and an exhaust port located at a downstream of the second inlet, the high pressure turbine being configured to be driven by the steam supplied from the first and second inlets, a reheater configured to heat the steam exhausted from the exhaust port, and a reheat turbine configured to be driven by the steam from the reheater.

The steam turbine system according to at least one embodiment of this disclosure comprises: a steam turbine; a main steam supply line which supplies steam to an upstream stage of the steam turbine; an intermediate-stage steam supply line which supplies the steam to an intermediate stage downstream of the upstream stage of the steam turbine; and an agent injection device which injects, into the intermediate-stage steam supply line, an agent for modifying the steam.