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A combined cycle power plant is an assembly of heat engines that work in tandem from the same source of heat, converting it into mechanical energy. On land, when used to make electricity the most common type is called a combined cycle gas turbine (CCGT) plant, which is a kind of gas-fired power plant.
In a normal combined cycle, so-called "waste heat" from the gas turbine exhaust is used in a Heat Recovery Steam Generator (HRSG) to make steam for the steam turbine cycle. An IGCC plant improves the overall process efficiency by adding the higher-temperature steam produced by the gasification process to the steam turbine cycle.
Gateway Generating Station, a combined-cycle gas-fired power station in California. CCGT power plants consist of simple cycle gas-turbines which use the Brayton cycle, followed by a heat recovery steam generator and a steam turbine which use the Rankine cycle. The most common configuration is two gas-turbines supporting one steam turbine. [9]
In May 2011, Mitsubishi Heavy Industries achieved a turbine inlet temperature of 1,600 °C (2,900 °F) on a 320 megawatt gas turbine, and 460 MW in gas turbine combined-cycle power generation applications in which gross thermal efficiency exceeds 60%. [105] [106] Compliant foil bearings were commercially introduced to gas turbines in the 1990s ...
Large (land-based) electric powerplants built using this combined cycle can reach conversion efficiencies of over 60%. [1] If the turbines do not drive a propeller shaft directly and instead a turbo-electric transmission is used, the system is known as COGES (combined gas turbine-electric and steam).
It has a 160 MW natural gas powered Alstom GT13E2 gas turbine which provides steam to an 80 MW steam turbine that together generate a total 240 MW of electricity. [1] It was the first combined cycle gas turbine power station in Western Australia. [2]
CCGT may refer to: . Combined cycle gas turbine, a type of combined cycle power plant commonly used for high efficiency, fast responding electricity generators; Closed-cycle gas turbine (but combined cycle, see above, is the more common usage for gas turbines)
A more modern system might use a gas turbine powered by natural gas, whose exhaust powers a steam plant, whose condensate provides heat. Cogeneration plants based on a combined cycle power unit can have thermal efficiencies above 80%.