Historical cycles[ edit ] Historically successful combined cycles have used mercury vapour turbines , magnetohydrodynamic generators and molten carbonate fuel cells , with steam plants for the low temperature "bottoming" cycle. Very low temperature bottoming cycles have been too costly due to the very large sizes of equipment needed to handle the large mass flows and small temperature differences. However, in cold climates it is common to sell hot power plant water for hot water and space heating. Vacuum-insulated piping can let this utility reach as far as 90km. The approach is called "combined heat and power" CHP. In stationary and marine power plants, a widely used combined cycle has a large gas turbine operating by the Brayton cycle.
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Combined-Cycle Power Plant - How it Works Tour a combined cycle power plant Learn the ins and outs of a power plant by taking this virtual degree tour Combined Cycle Power Plant: How It Works Inner Workings of a Combined-Cycle Power Plant A combined-cycle power plant uses both a gas and a steam turbine together to produce up to 50 percent more electricity from the same fuel than a traditional simple-cycle plant.
The waste heat from the gas turbine is routed to the nearby steam turbine, which generates extra power. Improve Performance with Digital How a Combined-Cycle Power Plant Produces Electricity This is how a combined-cycle plant works to produce electricity and captures waste heat from the gas turbine to increase efficiency and electrical output.
Gas turbine burns fuel. The gas turbine compresses air and mixes it with fuel that is heated to a very high temperature. The hot air-fuel mixture moves through the gas turbine blades, making them spin. The fast-spinning turbine drives a generator that converts a portion of the spinning energy into electricity. Heat recovery system captures exhaust. The HRSG creates steam from the gas turbine exhaust heat and delivers it to the steam turbine.
Steam turbine delivers additional electricity. The steam turbine sends its energy to the generator drive shaft, where it is converted into additional electricity.
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Combined cycle power plant