Elementary Principles 420

# Elementary Principles 420 - 9.57 Basis 50000 lb m coal fed...

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9- 68 9.57 a. Basis : 50000 lb coal fed h m 0.730 50000 lb C 1b - mole C h 12.01 lb 1b - mole C h m m bg b g = 3039 0 047 50000 101 2327 .. b g = lb - moles H h (does not include H in water) 0 037 50000 32 07 57 7 . b g = lb - moles S h 0 068 50000 18 02 189 b g = lb - moles H O h 2 0118 50000 5900 . b g = lb ash h m n 1 (lb-moles air/h) 50,000 lb coal/h m 3039 lb-moles C/h 2327 lb-moles H/h 57.7 lb-moles S/h 189 lb-moles H O/h 2 5900 lb ash/h m 77°F, 1 atm (assume) 0.210 O 2 0.790 N 2 Stack gas at 600°F, 1 atm (assume) n 2 (lb-moles CO /h) 2 n 3 (lb-moles H O/h) 2 n 4 (lb-moles SO /h) 2 n 5 (lb-moles O /h) 2 n 6 (lb-moles N /h) 2 m 7 (lb fly ash/h) m m 8 (lb slag/h) at 600°F m 0.287 lb C/lb mm 0.016 lb S/lb 0.697 lb ash/lb m m 77°F, 1 atm (assume) Feed rate of air : O required to oxidize carbon C+O CO lb- moles C 1 lb- mole O h1 l b - m o l e C lb - moles O h 2 22 2 2 →= = 3039 3039 Air fed: ± n 1 21710 = × = 1.5 3039 lb - moles O fed 1 mole air h 0.210 mole O lb - moles air h 2 2 30% ash in coal emerges in slag ⇒= = 0697 030 5900 2540 88 . ± . ± lb h lb slag / h ± . m 7 0 700 5900 4130
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