# coal volatile composition

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 April 30, 2011, 19:43 coal volatile composition #1 New Member   Join Date: Jan 2011 Posts: 7 Rep Power: 7 Hi all.... Could anyone please tell me how FLUENT calculates the volatile composition from proximate and ultimate analysis??..... e.g. my coal analysis are: Proximate(FLUENT input)[/B] (%) FC-43.7 VM-45.6 Moisture-2.2 Ash-8.5 Ultimate(dry ash free basis)(FLUENT input)[/B] (%) C-77.6 H-6 O-12.7 N-1.3 S-0.5 Ash-8.5 Proximate (Dry basis) (%) FC-44.8 VM-46.7 Ash-8.5 Ultimate(Dry basis) [B] (%) C-71 H-6 O-12.7 N-1.3 S-0.5 Ash-8.5 The volatile composition it shows in the coal calculator when I input these values is completely different what it comes out from hand calculation... Hand calculation: (From dry basis of both) wt%C in volatile = (71-44.8)/46.7 = 0.561 => moles = 0.561/12 = 0.04675 wt%H in volatile = (6.5)/46.7 = 0.128 => moles = 0.128/1 = 0.128 wt%O in volatile = (12.7)/46.7 = 0.272 => moles = 0.272/16 = 0.017 wt%N in volatile = (1.3)/46.7 = 0.028 => moles = 0.028/14 = 0.002 wt%S in volatile = (0.5)/46.7 = 0.011 => moles = 0.011/32 = 0.00034 So, Volatile = C0.04675 H0.128 O0.017 N 0.002 S0.00034 But FLUENT calculates (based on FLUENT input) : C1.4 H3.78 O0.51 N0.0587 S0.0109 The FLUENT calculation is also not an exact multiple of hand calculation...could anyone please explain why is the discrepancy and how FLUENT calculates the volatile matter composition... Thanks.... ramakant likes this.

 May 13, 2013, 05:16 #2 New Member   Join Date: May 2013 Posts: 1 Rep Power: 0 Hand Calculation C0.04675 H0.128 O0.017 N 0.002 S0.00034 But FLUENT calculates (based on FLUENT input) : C1.4 H3.78 O0.51 N0.0587 S0.0109 If you change the C ratio into 1, you will find the result quite similar Hand Calculation CH2.738 O0.364 N0.043 S0.007 But FLUENT calculates (based on FLUENT input) : CH2.7 O0.364 N0.042 S0.008

 Tags coal gasification, dpm, fluent, volatile composition

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