Through the efficient combustion of fuel, the gas turbine generates electricity and produces hot exhaust gas. The thermal energy in the hot exhaust gas is recovered through a Waste Heat Recovery Unit (WHRU), using an organic fluid as the heat exchange medium. The hot organic fluid is used to power an ORC-turbine and generator to generate additional electricity. This combined cycle characterizes itself with simplicity compared to a water-/steam-cycle, at the same time completely eliminating the need for water at all.
The Heat ReCycle range of power plants provides a wide choice of different industrial and aeroderivative gas turbines. The power plant can be customized for the required project-specific boundaries, such as power output and operating load regime. Heat ReCycle power plant configurations are possible from roughly 10 to almost 100 MWe capacity.
The 3 x SGT-400 Heat ReCycle reference configuration is used as an example for explaining this new power plant in further detail. Having a three-on-one (3 gas turbines on 1 ORC turbine) configuration in the typical 50-MW capacity size range enables operational flexibility. Especially for remote locations, the 50-MW size range has traditionally been served by reciprocating engines or simple cycle gas turbines. Now, Heat ReCycle offers a cleaner and more efficient alternative, while providing a great deal of flexibility through this multi-unit set-up.
The total power plant output of this configuration is in the range of roughly 52 - 58 MW, depending on the GT version and project conditions. See more plant details in the below table:
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