Question: Methane fuel is burned in a boiler system (open system) with atmospheric air. The HFK value for the air supplied to the combustion environment is

Methane fuel is burned in a boiler system (open system) with atmospheric air. The HFK value for the air supplied to the combustion environment is 1.2 in this system. The inlet temperature to the combustion environment for both air and fuel is 25. The combustion boiler is cooled by cooling water with a thermal efficiency of 60%. Assuming that the amount of heat transferred from the boiler to the cooling water per unit time is 278 kW;

a-) Calculate the molar percentage of water vapor in the flue gas (10p).

b-) Calculate the fuel consumption rate of the boiler (kg/s) (20p).

c-) Calculate the flue gas temperature (30p).

Given information and assumptions: MetanAID = 50000 kJ/kg HFK = Excess air coefficient Steady-state assumption is made. All reactants and reaction products are ideal gases. There is no condensation of water in the products.

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