Elementary Principles 411

Elementary Principles 411 - 9.47 (cont'd) Energy balance: Q...

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9- 59 Energy balance: ± ± ± ² ± ² ± ² QH H n H n H ii == + ΔΔ ξ r o out in Q = ++ +− = =− 135 mol kJ hm o l kJ 1 h 1 kW h 3600 s 1 kJ s kW SO out N out effluent solution 22 47 3 15 0 49 850 0 292 6360 50 000 0 003 101 49 850 0 73 22 000 611 . .40 , . ,. . , . a fa f a fa f af a f a f a f 9.48 a. b. c. CH g + 2O g CO g 2H O v 42 bg →+ () HHV LHV H H = = B B ° 890 36 2 890 36 2 44 01 802 34 . ²² .. . kJ / mol, kJ mol kJ mol CH c o Table B.1 HHV v at 25 C HO 4 2 ej CH g+ 7 2 Og ) C )3 ( v ) 24 2 2 2 (( 2 HHV LHV = = = 1559 9 1559 9 3 44 01 1427 87 . . kJ / mol, kJ mol kJ mol C H 26 C H g +5O g) CO g) 4H O(v) 38 2 2 2 3 HHV LHV = = = 2220 0 2220 0 4 44 01 2043 96 . . kJ / mol, kJ mol kJ mol C H HHV b g b g b g b g natural gas 0.875 890.36 kJ mol 1559.9 kJ mol kJ mol kJ mol =++ = 0070 0020 220000 933 . LHV b g b g b g natural gas 0.875 802.34 kJ mol 1427.87 kJ mol kJ mol = kJ mol =+ + 0 070 0 020 204396 843 . 1 mol natural gas 0.875 mol CH g mol mol C H g mol mol C H g mol mol N g mol kg 10 g kg 843 kJ 1 mol mol 0.01800 kg kJ kg 6 2 3 F H G I K J + F H G I K J + F H G I K J + F H G I K J ×= ⇒= [. . . . . ] . b g b g 1604 0 070 3007 0 020 44 09 0035 2802 1 0 01800 46800 The enthalpy change when 1 kg of the natural gas at 25
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