Elementary Principles 447 - 9.70 (cont'd) Solids balance on...

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9- 95 Solids balance on dryer: 0 35 24 000 0 75 11200 22 ., . ±± ×= = kg / d kg / d F 11.2 tonnes/ d (conc. sludge) nn Mass Balance on dryer : 24 000 11200 12 800 11 , , = + = kg / d Energy balance on sludge side of dryer: References : H O(l,22 C), Solids(22 C) 2 DD out in out in 1 23 ˆ ˆ Substance (kg d) (kg d) (kJ kg) (kJ kg) ˆ Solids 8400 0 8400 ˆ H O(l) 15600 0 2800 ˆ H O(v) 12800 n n H H H H H −− ± ± 1 2 3 water ˆ 2.5(100 22) 195.0 kJ/kg ˆ (419.1 92.2) 326.9 kJ/kg ˆ (2676 92.2) 2584 kJ/kg ˆ ( from Table B.5) H H H H =− = = = ± ± ² ± ² ± . ± . . . ± . Qm H m H Q QQ ii 7 7 7 3 7 356 10 055 6 47 10 2 91 10 = × = × ∑∑ out in steam kJ day kJ / d kJ / d Energy balance on steam side of dryer: 647 10 2133 1 10 30 3 7 3 3 3 . . ² × F H G I K J × F H G I K J F H G I K J ⇒= B kJ d = kg d kJ kg tonne kg tonnes/ d (boiler feedwater) for HO ( s a t 'd , ) v 2 H Δ Energy balance on steam side of boiler:
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