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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.
Cogeneration or combined heat and power (CHP) is the use of a heat engine [1] or power station to generate electricity and useful heat at the same time. Cogeneration is a more efficient use of fuel or heat, because otherwise- wasted heat from electricity generation is put to some productive use.
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).
The curve plots 501F combined cycle efficiency vs. time, with simple cycle power rating and heat rate shown at intervals along the development timeline. (Ed. Note: As of this edit in 2016, MHI offers the M501F3 at 185 MW and Siemens offers the SGT6-5000F (a.k.a. 501F) at 242MW, approximately the rating of the original 501G, below.)
A diagram of IGCC (integrated gasification combined cycle) power plant. TPD = tons per day, psi (unit of pressure) = pound-force per square inch. The diagram is based on: Jeff Crook, Back to the future, IET Power Engineer, June/July 2006, pp. 26-29 .
Load-following power plants can be hydroelectric power plants, diesel and gas engine power plants, combined cycle gas turbine power plants and steam turbine power plants that run on natural gas or heavy fuel oil, although heavy fuel oil plants make up a very small portion of the energy mix. A relatively efficient model of gas turbine that runs ...
The efficiency of a conventional steam–electric power plant, defined as energy produced by the plant divided by the heating value of the fuel consumed by it, is typically 33 to 48%, limited as all heat engines are by the laws of thermodynamics (See: Carnot cycle). The rest of the energy must leave the plant in the form of heat.
This example of combined cycle generation was not widely adopted because of high capital cost and the toxic hazard of the mercury potentially leaking into the environment. The mercury cycle offers an efficiency increase compared to a steam-only cycle because energy can be injected into the Rankine cycle at higher temperature. Metallurgical ...