1 A combined cycle power plant has a total power output of 300 MW. The gas turbine operates with a pressure ratio of 10, air inlet temperature of 30oC and the maximum gas temperature of 1000 oC. There is the provision for supplementary firing in which the combustion of additional fuel raises the gas temperature to 900 oC. The exhaust gas from the GT flows to a HRSG from which the gas leaves at 110oC. In the bottoming steam plant the steam is supplied to the turbine at 80 bar, 500 oC and the condenser pressure is 0.1 bar. The calorific value of the fuel burned is 43.2 MJ/kg. Neglect the effect of the mass flow rate of fuel on the air flow and take Cp = 1.11 kJ/kg K and γ = 1.33 for
1 A combined cycle power plant has a total power output of 300 MW. The gas turbine operates with a pressure ratio of 10, air inlet temperature of 30oC and the maximum gas temperature of 1000 oC. There is the provision for supplementary firing in which the combustion of additional fuel raises the gas temperature to 900 oC. The exhaust gas from the GT flows to a HRSG from which the gas leaves at 110oC. In the bottoming steam plant the steam is supplied to the turbine at 80 bar, 500 oC and the condenser
pressure is 0.1 bar. The calorific value of the fuel burned is 43.2 MJ/kg. Neglect the effect of the mass flow rate of fuel on the air flow and take
Cp = 1.11 kJ/kg K and γ = 1.33 for combustion gases and Cp = 1.005 kJ/kg K and γ = 1.4 for air. Neglect pump work. Determine (a) the flow rates of air and the steam required, (b) the power outputs of the gas
turbine and steam turbine, (c) the overall efficiency of the combined plant, and (d) the air-fuel ratio.
Draw the flow and T-s diagrams.
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