Elementary Principles 105

Elementary Principles 105 - 4.72 (cont'd) mole H 2 O 0.50...

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4- 64 4.72 (cont’d) Condensation measurement: 1.134 g H O 1 mol 18.02 g mol product gas mole H O mole product gas 2 2 bg b g 050 0126 . . = Basis: 100 mol product gas . Since we have the most information about the product stream composition, we choose this basis now, and would subsequently scale to the given fuel and air flow rates if it were necessary (which it is not). CH 2O CO 2H O CH 7 2 O2 C O 3 H O 42 22 26 2 2 2 +→ + + n 1 (mol CH 4 ) 0.1176 n 1 (mol C 2 H 6 ) n 2 (mol CO 2 ) n 3 (mol O 2 / h) 376 n 3 (mol N 2 / h) 100 mol dry gas / h 0.126 mol H 2 O / mol 0..874 mol dry gas / mol 0.119 mol CO 2 / mol D.G. x (mol N 2 / mol) (0.881-x) (mol O 2 / mol D.G.) Strategy: H balance n 1 ; C balance n 2 ; N b a l an c e O balance n 2 3 U V W , x H balance: mol CH in fuel 4 4 6 01176 100 0126 2 5356 11 1 nn n += = b g b g b g .. . 0.1176(5.356) = 0.630 mol C 2 H 6 in fuel C balance: 2 0 630 100 0874 0119 3784 . . . ++ = = b g b g b g b g mol CO in fuel 2 Composition of fuel: . m o l C H 4 , 0 630 m o l C H , 3784 m o l s C O 2 0548 . CH , 0.064 C H , 0.388 CO
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