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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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10. Cogeneration P&ID

This clause discusses the gas turbine (GT) Heat Recovery Steam Generator (HRSG).

10.0. Cogeneration/Combined Cycle Plants

Cogeneration (Co Gen)and Combined Cycle (CC) plants have one thing in common: electricity is generated with the help of hot flue gas, i.e., generation of electricity with the help of a GT. In a Co Gen plant, in addition to electric power generated by the GT, the exhaust flue gas (from the GT) heat may be utilized to produce steam, with help of HRSG, for other industrial purposes. In combined cycle (CC) plants, in addition electricity generation by GT, the exhaust gas from the GT has sufficient heat (and/or with supplementary firing) to use as a source of heat in the HRSG to generate steam to be used in the ...

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