3/25/ 7. A utility generates 500 MW of electricity while operating on natural gas The overall the...
efficiency of the plant is 33%. Air is supplied to the burners at 2.0 kPa and 300 K. Find the cost of natural gas per hour assuming the cost of natural gas is $20 per MWh. Also, find the power required to deliver the burner air across a 2 kPa pressure rise at 300 K. Assume that 10% excess air is required for clean combustion, and the fan efficiency is 90%. Assume that the stoichiometric air-fuel mass ratio is 17.2....
A combined gas–steam power plant has been designed with a net power output of 450 MW. The pressure ratio of the gas-turbine cycle is 14. Air enters the compressor at 300 K and the turbine at 1400 K. The combustion gases leaving the gas turbine are used to heat the steam at 8 MPa to 400 C in a heat exchanger. The combustion gases leave the heat exchanger at 460 K. An open feedwater heater incorporated with the steam cycle...