A heat recovery steam generator (HRSG) is one of the major pieces of equipment in a gas turbine combined cycle power plant that boasts a high thermal efficiency and produces minimal CO2 emissions. An HRSG is a kind of heat exchanger that recovers heat from the exhaust gases of a gas turbine to an extreme degree.

The HRSG consists of four major components: Evaporator, Super heater, Economizer, and Drum. The different components are combined to meet the operating requirements of the unit. The high quality heat from the gas turbine exhaust allows for the utilization of the thermal energy to generate electricity by a steam turbine along with the gas turbine in a combined cycle system process that also allows the thermal energy to be restored and used for heating or cooling of the premises and used to provide domestic hot water.

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