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5 155 487 213 kjmole 961 3928 1131 4530 the energy

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Unformatted text preview: 1 109 107 105 103 Temperature (C) 101 99 97 95 93 91 89 87 85 83 81 79 77 75 0 0.1 0.2 0.3 0.4 0.5 x, y 0.6 0.7 0.8 0.9 1 5) (60 pts) Methane (CH4 ) and air (21 mole% O2 and 79 mol% N2) are fed to a furnace. The methane enters at 25°C; the air enters at 100°C and a flow rate of 1000 mole/min. The gases react in the furnace and produce an exhaust gas in which the following flow = 5 mole/min, = 95 mole/min, = rates are observed on a dry basis: 12.5 mole/min and = 790 mole/min. The temperature of the exhaust gas is 1000°C. What is the percent excess air in this system? How much water (vapor) is produced? How much heat transfers and in which direction (into the furnace or out of the furnace)? SOLUTION The process diagram for this system looks like Exhaust Gases 5 / 95 / 12.5 / 790 / T = 1000°C Air 1000 0.79 0.21 T = 100°C / Furnace CH4 H2O (v) T = 25°C T = 1000°C The two reactions that are occurring are 3 2 2 2 2 Now do a carbon balance to get 5 95 100 / If there are 100 mol/min of CH4 entering the second reaction indicate...
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