A solenoid valve includes a main valve, a first auxiliary valve, a second auxiliary valve, a main valve body, and an auxiliary valve body. The main and auxiliary valve bodies are axially parallel and detachably connected. The main valve is mounted on the main valve body, the first and second auxiliary valves are mounted on the auxiliary valve body, which is provided with an air inlet, a cylinder port and an air discharging port. The air inlet communicates with the main valve through a first air passage. The cylinder port is sequentially in communication with the first and second auxiliary valves and the main valve through a second air passage. The air discharging port sequentially communicates with the first and second auxiliary valves and the main valve through a third air passage. The main and second auxiliary valves are solenoid valves. The first auxiliary valve is a hand-operated valve.

The device includes a main valve, first and second auxiliary valves, a valve body and a filter. The main, which has first and second auxiliary valves are mounted on the valve body, which has an air inlet, a cylinder port and an air discharging port. The air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the first and second auxiliary valves, and the main valve through a second air passage. The air discharging port is sequentially in communication with the first and second auxiliary valves and the main valve through a third air passage. The main and the second auxiliary valves are solenoid valves, and the first auxiliary valve is a hand-operated valve. An air outlet of the filter is in communication with the air inlet. The filter is used for filtering out impurities in gas.

Steam generators in power plants exchange energy from a primary medium to a secondary medium for energy extraction. Steam generators include one or more primary conduits and one or more secondary conduits. The conduits do not intermix the mediums and may thus discriminate among different fluid sources and destinations. One conduit may boil feedwater while another reheats steam for use in lower and higher-pressure turbines, respectively. Valves and other selectors divert steam and/or water into the steam generator or to other turbines or the environment for load balancing and other operational characteristics. Conduits circulate around an interior perimeter of the steam generator immersed in the primary medium and may have different cross-sections, radii, and internal structures depending on contained. A water conduit may have less flow area and a tighter coil radius. A steam conduit may include a swirler and rivulet stopper to intermix water in any steam flow.

A steam turbine includes: a partition section that partitions a high-pressure stage and a low-pressure stage; and a pressure regulation valve that regulates a pressure of extraction steam. The pressure regulation valve includes: a plurality of flow rate regulation valves; and a plurality of flow path compartments that correspond to the respective flow rate regulation valves and that communicate with the low-pressure stage side relative to the partition section through respective nozzle holes. The plurality of flow path compartments are arranged over the entire partition section in a circumferential direction in a region including an outer peripheral side of the pressure regulation valve relative to the partition section as a whole. The partition section includes a bypass passage that makes the high-pressure stage side and the low-pressure stage side communicate with each other without passing through the pressure regulation valve.

This combined cycle gas turbine plant has a gas turbine (104) and a steam turbine (106) mounted on the same shaft. A control system is configured for switching the plant from a rated mode of operation, in which the plant is operated on gas turbine output and steam turbine output, to a reduced load mode of operation, in which the plant is operated on gas turbine output alone. The switch from the rated mode of operation to the reduced load mode of operation occurs if plant demand decreases below a predetermined threshold. The steam turbine is run under full speed no load conditions in the reduced load mode of operation, and is heated using controlled steam admission, to maintain the steam turbine in a heated stand-by state.

Steam generators in power plants exchange energy from a primary medium to a secondary medium for energy extraction. Steam generators includes one or more primary conduits and one or more secondary conduits. The conduits do not intermix the mediums and may thus discriminate among different fluid sources and destinations. One conduit may boil feedwater while another reheats steam for use in lower and higher-pressure turbines, respectively. Valves and other selectors divert steam and/or water into the steam generator or to other turbines or the environment for load balancing and other operational characteristics. Conduits circulate around an interior perimeter of the steam generator immersed in the primary medium and may have different cross-sections, radii, and internal structures depending on contained. A water conduit may have less flow area and a tighter coil radius. A steam conduit may include a swirler and rivulet stopper to intermix water in any steam flow.

A method of controlling a turbine of an exhaust heat recovery system in which heat of exhaust gas evaporates a working fluid through a heat exchanger provided in an exhaust pipe and the working fluid is supplied to the turbine may include measuring an internal temperature of the heat exchanger, and rotating the turbine in a reverse direction when the measured internal temperature is a predetermined temperature or less.

The once-through boiler includes a water supply and at least an economizer, an evaporator superheater. No valves are provided between the economizer, the evaporator and the superheater. The high-pressure turbine includes a control valve. The method for low load operation of a power plant with a once-through boiler and a high pressure turbine includes providing a parameter indicative of the stable operation of the once-through boiler in once-through operation, and on the basis of this parameter adjusting the control valve in order to regulate the pressure within the economizer and evaporator and/or adjusting the temperature of the water supplied to the economizer.

A balanced grid valve for steam extraction from a multi-stage steam turbine comprising a first balancing chamber and a second balancing chamber which are configured to receive steam at high pressure through at least one duct. The balancing chambers are preferably in the form of annular grooves and are arranged at two different radial distances from the axis of the valve in order to reduce mechanical distortion of the valve.

The present application provides a combined cycle system. The combined cycle system may include a heat recovery steam generator, a feedwater source positioned upstream of the heat recovery steam generator, a desuperheater positioned downstream of the heat recovery steam generator, a first extraction from the heat recovery steam generator to the desuperheater, and a second extraction from upstream of the heat recovery steam generator to the desuperheater.