A steam turbine plant includes a high-medium pressure turbine having a high-pressure turbine section provided at one end portion in an axial direction and a medium-pressure turbine section provided at the other end portion; a low-pressure turbine disposed coaxially with the high-medium pressure turbine; a condenser configured to cool steam used in the low-pressure turbine to condense the steam into condensate; and a feed-water heater configured to heat the condensate with steam discharged from the high-pressure turbine section. The plant also includes a low-pressure moisture separating and heating device configured to remove moisture of steam discharged from the medium-pressure turbine section, and to heat the steam with a part of steam to be sent to an inlet portion of the high-pressure turbine section and a part of steam to be sent to an inlet portion of the medium-pressure turbine section from an outlet portion of the high-pressure turbine section.

An injection feedwater heater for a steam power generating system includes at least one main heater body and at least one injection nozzle. The main heater body has at least one heat exchange compartment, at least one water inlet, at least one steam inlet, and at least one water outlet formed on the main heater body. The injection nozzle is provided in the main heater body at a position adjacent to the water inlet, wherein a predetermined amount of condensate water is arranged to be pumped into the main heater body through the water inlet. The condensate water passing through the water inlet is arranged to be injected into the heat exchange compartment through the injection nozzle for creating a negative pressure in the heat exchange compartment. The negative pressure drawing a predetermined amount of steam to enter the heat exchange compartment for mixing with the condensate water.

A combined heat recovery device includes a high pressure cylinder of a steam turbine; a main steam pipe; a final-stage steam extraction pipe; an additional pipe additionally provided on the main steam pipe; a heat exchanger taking main steam in the main steam pipe as a heat source; a feedwater heater taking discharged steam from the heat exchanger as a heat source; and a steam side regulating valve provided on the additional pipe, configured to regulate main steam in the additional pipe, and capable of controlling a pressure of extracted steam behind the steam side regulating valve to control an outlet temperature of the feedwater heater to reach a preset feedwater temperature.

A steam power generating system includes at least one steam generator, at least one turbine assembly, at least one electric generator, at least one condenser and a feedwater preheat arrangement including at least one injection feedwater heater connected to the condenser and the turbine assembly. The injection feedwater heater includes a main heater body and at least one injection nozzle. A predetermined amount of condensate water from the condenser is arranged to be pumped into the main heater body. The condensate water passing through the water inlet is arranged to be injected into a heat exchange compartment through the injection nozzle for creating a negative pressure in the heat exchange compartment. The negative pressure draws a predetermined amount of steam from the turbine assembly to enter the heat exchange compartment for mixing with the condensate water.

An injection feedwater heater for a steam power generating system includes at least one main heater body and at least one injection nozzle. The main heater body has at least one heat exchange compartment, at least one water inlet, at least one steam inlet, and at least one water outlet formed on the main heater body. The injection nozzle is provided in the main heater body at a position adjacent to the water inlet, wherein a predetermined amount of condensate water is arranged to be pumped into the main heater body through the water inlet. The condensate water passing through the water inlet is arranged to be injected into the heat exchange compartment through the injection nozzle for creating a negative pressure in the heat exchange compartment. The negative pressure drawing a predetermined amount of steam to enter the heat exchange compartment for mixing with the condensate water.

An apparatus and method for recovery of waste heat in a boiler system, wherein heat from the low pressure steam in the feed water tank, which otherwise would be lost through dissipation, is used for other applications. Particularly, the waste heat energy recovered in the form of low pressure steam can be used to heat make-up water for the boiler system.

A system and method for warmkeeping a steam generator such as a sub-critical steam generator is disclosed. Water extraction piping extracts water from a component of one of the water fill circuits of the sub-critical steam generator. A deaerator heating system having an inventory tank of water mixes the extracted water with the water in the tank, and heats the mix of water to a predetermined temperature level to generate heated deaerated feedwater. Feedwater piping forwards the heated deaerated feedwater at the predetermined temperature level from the deaerator heating system to the water fill circuits of the sub-critical steam generator. The water extraction piping, the deaerator heating system and the feedwater piping operate cooperatively to warmkeep the water fill circuits in accordance with the predetermined temperature level while the sub-critical steam generator is in the unfired stand-by mode of operation.

A power generation facility in an embodiment includes: a boiler; a high-pressure turbine to which steam generated in the boiler is introduced; a low-pressure turbine provided downstream of the high-pressure turbine; and a condenser that condenses steam discharged from the low-pressure turbine. The power generation facility further includes: a feed pipe that leads feedwater in the condenser to the boiler; a heat storage and steam generation device that has a heat storage function that uses surplus energy generated in an own system to store heat, and a steam generation function that has part of feedwater led by the feed pipe introduced thereinto and turns the feedwater into steam by the stored heat; and a steam supply pipe that supplies steam generated in the heat storage and steam generation device to an own system.

A preheating system for preheating fluid medium to be fed into the HRSG is disclosed. The system includes a feed line and a recirculation line. The feed line is adapted to feed the fluid medium to a Low Pressure Economizer (LPE) of the HRSG. The feed line is adapted to be adjoined to an inlet of the LPE, and an outlet of the LPE enables therefrom the flow of the fluid medium in further portion of the HRSG. The recirculation line is adapted to be connected between the outlet and the inlet of the LPE, in parallel to LPE to recirculate the fluid medium to the LPE. A particular method of preheating using such a system is equally disclosed.

Disclosed is a gas turbine and pressurized water reactor steam turbine combined circulation system, using a heavy duty gas turbine and a pressurized water reactor steam turbine to form a combined circulation system. Heat of the tail gas of the gas turbine is utilized to raise the temperature of a secondary circuit main steam from 272.8 C., and the temperature of the secondary circuit main steam slides between 272.8 C. and 630 C. according to different pressurized water reactor steam yields and different input numbers and loads of the heavy duty gas turbine. The system has a higher heat efficiency than that of the pressurized water reactor steam turbines in the prior art; and as for the electric quantity additionally generated by gas, the heat efficiency of the system is also significantly higher than that of gas-steam combined circulation in the prior art.