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Natural Gas (1 mol/s) composed of 85 mol% methane, 8 mole% ethane and 7 mol% CO2...

Natural Gas (1 mol/s) composed of 85 mol% methane, 8 mole% ethane and 7 mol% CO2 is

used to generate heat in a boiler. The fuel is fed to the boiler with 25% excess air that has a relative

humidity of 35%. Both natural gas and humid air are fed at 250C. Heat from the combustion is

transferred to liquid water that enters the heat exchanger as a liquid at 250C and leaves as a vapor at 1

bar and 3000C. If the combustion product gas exits the boiler at 5000C and the ratio of CO to CO2 in the

combustion products is 0.10, what is the flow rate of the cooling water if it can be assumed that all the

heat from the combustion process goes to heat the liquid water.

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