Question A steam power plant has the following specifications
Steam output = 31.6kg/s
Steam pressure = 60 bar
Steam temperature = 5000c
Feed H20 temperature at pump inlet = 1000c
Fuel: natural gas (96.5% CH4, 0.5% C2H6, Remaider incombustible.
Fuel consumption = 2.85m3/s
Gross calorific value of fuel = 38,700 Kj/m3 at 1.013 bar and 150c.
Molar masses: carbon = 12, H = 1, O = 16
Calculate
The plant power output in KJ/s
Boiler efficiency
Overall plant thermal efficiency base on the net calorific value of the fuel