Wet Combustion of Coal

Leepox · August 23, 2012, 13:31

I have enable wet combustion under DPM (I am using species transport).

I take it you are supposed to calculate the volume fraction of liquid?

Does anyone have any tips with regards to this?

Olga · September 11, 2012, 23:36

Hello.

I calculate it like:

volume fraction of liquid = (dry coal density)*(mass fraction of Moisture in coal)/(998.2-998.2*mass fraction of Moisture+dry coal density*mass fraction of Moisture)

Best regards,
Olga

Leepox · September 17, 2012, 11:09

Thanks a lot for this Olga!

Just a quick question, if you are using species transport (Eddy Dissipation), do you turn on wet combustion in coal calculator or do you turn it on under the DPM wet combustion option alone?

This is because it will ask for coal dry density once you turn wet combustion option on in the coal calculator.

Leepox · September 18, 2012, 07:55

Never mind I figured out that you don't actually need to calculate this manually as Fluent solves the moisture volume fraction by just simply inputting a dry coal density in the coal calculator.

having said that, you still need to actually enable wet combustion manually in the DPM settings. Again thanks!

August 23, 2012, 13:31	Wet Combustion of Coal	#1
Leepox Member Join Date: Nov 2011 Posts: 42 Rep Power: 14	I have enable wet combustion under DPM (I am using species transport). I take it you are supposed to calculate the volume fraction of liquid? Does anyone have any tips with regards to this?

September 11, 2012, 23:36		#2
Olga New Member Olga Stavskaya Join Date: Nov 2010 Location: Russia Posts: 11 Rep Power: 15	Hello. I calculate it like: volume fraction of liquid = (dry coal density)(mass fraction of Moisture in coal)/(998.2-998.2mass fraction of Moisture+dry coal density*mass fraction of Moisture) Best regards, Olga Leepox and souza.emer like this.

September 18, 2012, 07:55		#4
Leepox Member Join Date: Nov 2011 Posts: 42 Rep Power: 14	Never mind I figured out that you don't actually need to calculate this manually as Fluent solves the moisture volume fraction by just simply inputting a dry coal density in the coal calculator. having said that, you still need to actually enable wet combustion manually in the DPM settings. Again thanks! souza.emer likes this.

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September 17, 2012, 11:09		#3
Leepox Member Join Date: Nov 2011 Posts: 42 Rep Power: 14	Thanks a lot for this Olga! Just a quick question, if you are using species transport (Eddy Dissipation), do you turn on wet combustion in coal calculator or do you turn it on under the DPM wet combustion option alone? This is because it will ask for coal dry density once you turn wet combustion option on in the coal calculator.