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Split_00075 - 9.60(cont'd H p = n2 H v H o 2 O(25 C nstack...

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9- 75 b. ± ± ( ² ) ± ( ) ( . H n H n C T p v p = + + × 2 H O(25 C) stack gas stack gas stack gas o 2 3 3 o o 7 2 o C) = 180 kmol H O 10 mol kJ h 1 kmol mol kmol 10 mol 0.0315 kJ (300-25) C h 1 kmol mol C = 5.63 10 kJ / h Δ 25 44 01 5590 ± ± ± ( ² ) ² ² . . . Q H H n H n H i i i i = = + F H G I K J F H G I K J F H G I K J + × = − × Δ Δ ξ c o CH out in 4 = 450 kmol h mol kmol kJ mol kJ h kJ h 1000 890 36 563 10 344 10 7 8 Energy balance on steam boiler ± ± ² ± ± . Q m H m m w w w w = × = F H G I K J L N M O Q P L N M O Q P = × Δ + 3.44 10 kJ h kg h kJ kg kg steam / h 8 Table B.7 Table B.6 2914 105 123 10 5 b g 45 kmol CH 4 /h 25°C furnace Liquid, 25°C m w (kg H O/h) 2 vapor, 17 bars m w (kg H O/h) 2 250°C n 1 (mol O /h) 2 n 2 (mol N /h) 2 n 3 (mol CO /h) 2 n 4 (mol H O/h) 2 n a (mol air/h) at T a (°C) air preheater n a (mol air/h) at 25°C 0.21 O 2 0.79 N 2 n 1 (mol O /h) 2 n 2 (mol N /h) 2 n 3 (mol CO /h) 2 n 4 (mol H O/h) 2 Stack gas 300°C 150°C E.B. on overall process : The material balances and the energy balance are identical to those of part (a), except that the stack gas exits at 150 o C instead of 300
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