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Introduction to combined cycle power plant in less than 2 minutes.
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.Cogeneration of heat & electricity is possible in a Combined cycle plants. Explanation: One of the major advantages of a combined cycle plants is the cogeneration of heat & electricity. 10. Efficiency of Natural gas fired Combined cycle plants is more than that of coal-fired plants. Combined Cycle Power Plants
Paul Breeze, in Gas-Turbine Power Generation, 2016

Heat Recovery Steam Generators
The HRSG is a key component of a combined cycle power plant. Its role is to convert as much of the heat as possible from the exhaust gas of the gas turbine into steam for a steam turbine. The temperature of the exhaust gases from the steam turbine will be between 400°C and perhaps 650°C, low compared to the gases exiting the boiler of a coal-fired power plant. The heat in this gas is captured by water and steam that flows through tubes placed in the path of the hot gases. These tubes will have fins welded to them to increase their surface area so that they can absorb more heat from the hot gases. These tubes are arranged in modules, sometimes called racks, with each module serving a slightly different function.
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