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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.
Steam locomotives were tested in the past but were not ideal for low speeds, and gas turbine locomotives were used by Union Pacific until the 1970s. [1] Combined cycle power uses the heat from the gas turbine to make steam from the water to turn a steam turbine, instead of that heat getting exhausted out and wasted.
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).
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]
Gateway Generating Station (GGS), formerly Contra Costa Unit 8 Power Project, is a combined-cycle, natural-gas-fired power station in Contra Costa County, California, which provides power to half a million customers in northern and central California.
The original power station on the site was a 200 MW gas turbine power plant that opened in 1976 and closed in 2001. The current power station comprises a 377 MW combined cycle unit that opened in 1998 and two open cycle gas turbine units for peaking power that opened in 2011. The station is now owned and operated by Contact Energy.
Lake Side Power Station [1] is a natural gas turbine combined cycle power plant in Vineyard, Utah, United States. The plant consists of 2 power blocks, each containing a 2x1 combined cycle power plant. It was built by with Siemens Westinghouse Power Corporation [2] and is operated by PacifiCorp which does business in Utah as Rocky Mountain ...