The process is modeled using specifications found from references
[15,16]. Compressed syngas is combusted in the
burner of the gas turbine with compressed air, and then the
combustion exhaust is sent to the gas turbine to generate
electricity. To protect the gas turbine from reaching excessive
temperatures, additional air above that needed for complete
combustion is provided. The amount of air is calculated so
that the temperature of the exhaust from the gas turbine
burner is 1351 K. The gas turbine has an isentropic efficiency
of 90% and a mechanical efficiency of 98%, and its discharge
pressure is 1 atm. Exhaust from the gas turbine is mixed with
exhaust from the combustor, and sent to the steam generation
system. A portion of the syngas is added in a duct-burner
after the gas turbine (before the steam generation system)
when the heat energy from the exhaust mixture is not sufficient
to meet the ethanol plant’s process heat demand.