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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.
English: Schematic diagram for a Turbine Based Combined Cycle (TBCC) engine. 1) low speed inlet 2) high speed inlet 3) turbojet 4) dual-mode scramjet flowpath 5) high speed nozzle 6) low speed nozzle 1) low speed inlet 2) high speed inlet 3) turbojet 4) dual-mode scramjet flowpath 5) high speed nozzle 6) low speed nozzle
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).
This is known as a combined cycle plant. Cogeneration uses waste exhaust heat for process, district heating or other heating uses. Both of these options are used only in plants that are intended to be operated for longer periods than usual. Natural gas and diesel generators with reciprocating engines are sometimes used for grid support using ...
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.
A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. [5] Typical coal-based power plants operating at steam pressures of 170 bar and 570 °C run at efficiency of 35 to 38%, [6] with state-of-the-art fossil fuel plants at 46% efficiency. [7] Combined-cycle systems can reach higher values.
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 ...