Abstract:
In one embodiment, a combined cycle power plant includes first and second superheaters to generate first and second main steams, first and second reheaters to heat first and second discharge steams to generate first and second reheat steams, and a steam turbine to be supplied with the merged first and second reheat steams. The plant further includes a first valve to adjust a flow rate of the first discharge or reheat steam, and a second valve to adjust a flow rate of the second discharge or reheat steam. A plant control apparatus includes a determination module to determine a target opening degree of the second valve by using flow rates of the first and second main steams, and a controller to compare the determined target opening degree with a valve opening degree of the second valve and to control the second valve based on a comparison result.
Abstract:
A method (100) includes determining, via a processor (39), a commanded temperature rate for a component of a steam turbine system (41). The method (100) further includes determining, via the processor (39), a measured temperature rate for the component of the steam turbine system (41). The method (100) additionally includes determining, via the processor (39), a variable multiplier based at least in part on the commanded temperature rate and the measured temperature rate. The method (100) also includes deriving, via the processor (39), a multiplied temperature rate command by applying the variable multiplier to the commanded temperature rate.
Abstract:
The invention discloses a method for operating a gas turbine (10) with sequential combustion (14, 15, 17, 19), which gas turbine (10) comprises a compressor (13), a first combustor (14, 17) with a first combustion chamber (14) and first burners (17), which receives compressed air from the compressor (13), a second combustor (15, 19) with a second combustion chamber (15) and second burners (19), which receives hot gas from the first combustor (14, 17) with a predetermined second combustor inlet temperature, and a turbine (16), which receives hot gas from the second combustor (15, 19). The CO emission for part-load operation is reduced by reducing the second combustor inlet temperature for base-load operation of the gas turbine (10), and increasing the second combustor inlet temperature when decreasing the gas turbine load (RL GT ) from base-load to part-load.
Abstract:
A system and related method for providing a highly reactive fuel to a combustor of a gas turbine are disclosed herein. The system includes a fuel supply system that is in fluid communication with a fuel supply. The fuel supply system includes multiple fuel circuits. Each fuel circuit individually feeds fuel to a corresponding fuel distribution manifold. The system further includes a steam injection system. The steam injection system includes at least one flow control valve that is in fluid communication with at least one of the fuel circuits. The flow control valve provides for fluid communication between a superheated steam source and the fuel circuit during both fueled operation and during non-fueled operation of the corresponding fuel circuit.
Abstract:
A method is provided for increasing an emissions compliant load range (50) for a combined-cycle system (10). The method includes bypassing an air flow from a compressor (14) to a HRSG (20), to form a mixture of bypassed air and exhaust gas sent from a turbine outlet (42), as the operating load is reduced from the intermediate load level (57) to a lower load level within the range (50), to have a cooling effect on the temperature (61) of the mixture at the HRSG (20). The method further includes increasing an exhaust temperature set point of the turbine (18), to increase the temperature (60) of the exhaust gas above an emissions compliant threshold temperature (62), and have a heating effect on the temperature (61), such that the heating effect and the cooling effect at the HRSG (20) limit the time rate of change of the temperature (61).
Abstract:
A combined cycle power plant comprises a combustion turbine generator, another heat source in addition to the combustion turbine generator, a steam power system, and an energy storage system. Heat from the heat source, from the energy storage system, or from the heat source and the energy storage system is used to generate steam in the steam power system. Heat from the combustion turbine generator exhaust gas may be used primarily for single phase heating of water or steam in the steam power system. Alternatively, heat from the combustion turbine generator exhaust gas may be used in parallel with the energy storage system and/or the other heat source to generate steam, and additionally to super heat steam. Both the combustion turbine generator and the steam power system may generate electricity.
Abstract:
Various embodiments disclosed relate to cooling shale gas via reaction of methane, light hydrocarbons, or a combination thereof, with water. In various embodiments, the present invention provides a method of cooling syngas. The method includes contacting the hot syngas with methane or light hydrocarbons. The hot syngas includes water and has a temperature of about 800° C. to about 3000° C. The contacting is effective to endothermically react the methane or light hydrocarbons with the water in the hot syngas to form carbon monoxide and hydrogen and to provide a cooled syngas having a lower temperature than the hot syngas.
Abstract:
A power generation system and a control method of a power generation system that control output sharing for stable operation due to a change of generated power are provided. The power generation system (100) includes a power turbine (7) that is driven by exhaust gas generated by an engine, a steam turbine (9) that is driven by steam generated by the exhaust gas of the engine, a turbine generator (25) that is connected to the power turbine (7) and the steam turbine (9), a TPC (57) that controls an output of the steam turbine (9), and a PMS (53) that controls load sharing of an output of the power turbine (7) and the output of the steam turbine (9). Here, when the power turbine (7) is started, an increase instruction request for increasing an available power of the turbine generator (25) is performed.
Abstract:
A steam conduit heating system (200) includes at least one electric heating element (220) coupled to at least a portion of a steam conduit (112). The system also includes at least one conduit heating controller (230) operatively coupled to the at least one heating element and programmed to vary a rate of temperature change in the portion of the steam conduit, wherein the at least one controller is further programmed to vary the rate of temperature change in the portion of the steam conduit as a function of at least one of a mass of the portion of the steam conduit, and a shape of the portion of the steam conduit.