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Split_00096

# Split_00096 - 9.70(cont'd Air fed(25 excess = 1.25(4.76...

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9- 96 b. c. d. Air fed (25% excess) =1.25(4.76 kmol air kmol O kmol O d kmol air d 2011 kmol 29 kg 1 tonne d kmol 10 kg E =58.3 tonnes/ d air to boiler) 2 2 3 )( ) ± ( 338 2011 = Energy balance on boiler air preheater : 3 o 6 0 2011 kmol 10 mol 2.93 kJ kJ ˆ Table B.8 (125 C) 2.93 5.89 10 kJ/d d 1 kmol mol mol air H Q = = = × ± Supplementary fuel for incinerator : ± . n 6 97 5 = = 11.2 tonne sludge 195 SCM 1 kmol d tonne 22.4 SCM kmol d MW MW MW gas = + = + = 0 90 010 0 90 16 010 30 17 4 . . ( . )( ) ( . )( ) . CH C H 4 2 6 kg kmol M gas = ( . )( . ) ± 97 5 17 4 G = 1.7 tonne / d (natural gas) CH O CO + 2H O, C H O CO + 3H O 4 2 2 2 2 6 2 2 2 + + 2 7 2 2 Air feed to incinerator: 3 4 3 , 11200 kg sludge 0.75 kg sol 19000 kJ 2.5 m (STP) air 1 kmol kmol air (air) : 1781 d kg sludge 1 kg sol 10 kJ 22.4 m (STP) d th sludge = 4 2 , 4 2 kmol CH 2 kmol O kmol 4.76 kmol air kmol air (air) : 97.5 0.90 (0.10)(3.5) 998 d kmol kmol CH 1 kmol O d th gas ⎤⎛ × + = ⎦⎝ 7 3 kmol air 100% excess air: 2(1781 998) 5558 kmol air/d d 5558 kmol air 29.0 kg air 1 tonne 161 tonne air/d (incinerator air)
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