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Input coal properties into Fluent

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Old   August 31, 2007, 13:46
Default Input coal properties into Fluent
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Michael Tran
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Hello I'm learning coal combustion modeling for Fluent. I'm given ultimate and proximate analysis of coal. How do I input these values into fluent? I've been told to use the PDF approach to make a table for these values...Any other suggestions and comments would greatly help Thank you in advance
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Old   September 4, 2007, 11:21
Default Re: Input coal properties into Fluent
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treit
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From the UA and PA you should be able to calculate the standard state enthalpy and molecular weight of the volatile matter in the coal particle. These values would then be input into the material definition panel for the volatile type you chose from the Fluent database (i.e., hv-vol, mv_vol, lv_vol.) You can input the %volatile matter from the proximate analysis in the volatile content field and the % fixed carbon in the combustible fraction field (both fields can be found in the material definition panel for the combustible particle.)
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Old   September 4, 2007, 13:58
Default Re: Input coal properties into Fluent
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Michael
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Thank you for the advise above. I'm wondering so I don't create PDF table to input the fuel and oxidizer for my coal? I've seen tutorials where they use Non-premixed combustion and create a new PDF table to input the fuel properties. Is this another approach?

Also, hv-vol, lv-vol, and mv-vol. What does hv, lv, and mv stand for? Are these high heating value, low heating value, etc...and what is the advantage of choosing one over another

Thank you in advance
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Old   September 4, 2007, 14:42
Default Re: Input coal properties into Fluent
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treit
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To answer your first question I am not sure.. I have never done premixed combustion modeling. If your fuel and oxidizer enter in the same stream then I would advise you to learn from the tutorials you mentioned and try to follow those steps for your problem (similar tutorials can be found in the intermediate/advanced section on the fluentusers.com website.)

To answer you second question, yes, you are correct. But I don't see any advantage over using one over another, it all depends on the specific type of coal you are trying to model.

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