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April 30, 2011, 19:43 |
coal volatile composition
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#1 |
New Member
Join Date: Jan 2011
Posts: 7
Rep Power: 15 |
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.... |
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May 13, 2013, 05:16 |
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#2 |
New Member
Join Date: May 2013
Posts: 1
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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 |
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August 6, 2018, 13:03 |
adjusting the MW for the volatile
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#3 |
New Member
Jahangir
Join Date: Aug 2017
Posts: 13
Rep Power: 9 |
Include the molecular weight. It seems like for Fluent your MW for the volatile is around 30 kg/kmol.
Therefore, you should multiply the volatile MW value (kg/kgmol) to the mass fraction, before converting into mols. So, for instance, if we take C for now wt%C in volatile = (71-44.8)/46.7 = 0.561 * 30=16.83=> moles = 16.83/12 = 1.4025 This is applicable to the other elements in the volatile, which will give C1.4 H3.78 O0.51 N0.0587 S0.0109 |
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August 28, 2024, 02:44 |
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#4 | |
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Chainsaw
Join Date: Dec 2023
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Quote:
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Tags |
coal gasification, dpm, fluent, volatile composition |
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