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Consider a combined gas-steam power plant that has a net output of 270 MW. The pressure ratio of the gas-turbine cycle i
Posted: Fri Jul 01, 2022 6:38 am
by answerhappygod
- Consider A Combined Gas Steam Power Plant That Has A Net Output Of 270 Mw The Pressure Ratio Of The Gas Turbine Cycle I 1 (84.15 KiB) Viewed 26 times
Consider a combined gas-steam power plant that has a net output of 270 MW. The pressure ratio of the gas-turbine cycle is 12.2. Air enters the compressor at 300K and the turbine at 1172K. The combustion gases leaving the the gas turbine are used to heat the water to saturated vapor in a heat exchanger. The combustion gases leave the heat exchanger at 420K. The steam enters the steam turbine at 5 bar and 400°C. The condenser pressure is 10 kPa. Assuming isentropic efficiencies of 100% for the pump, 75% for the compressor, and 77% for the gas and steam turbines, determine: i. The mass flow ratio of air to steam; ii. The required rate of heat input in the combustion chamber, and iii. The thermal efficiency of the combined.