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# thermal conductivity of flue gas from furnace

## thermal conductivity of flue gas from furnace

(OP)
I'm designing furnace using low heat fuel oil for the burner. I've tried to find the thermal conductivity of the flue gas in Perry but it's not there..
Any idea ?
Should I consider the flue gas as a mixed gas containing H2, O2, etc. and then count the 'k' from them ?
Thank alot before.

### RE: thermal conductivity of flue gas from furnace

I'd calculate it as a mixture as you suggested.  Note there won't be any H2 (this might be a typo and you meant H20) in the flue gas and not much O2 (perhaps a couple of percent) .

You'll need to do a combustion calculation on the fuel oil to come up with the flue gas composition for the expected excess O2 or air you'll be running.  The majority of the flue gas will be N2 from the air with the balance being C02 and H20 and some O2.  Since fuel oil can contain up to 1 wt% sulfur (less in some areas depending on the oil especially if it is a light fuel oil or it can be more for some heavy fuel oils).  Look for a thread called chemical composition of fuel oil, someone posted a typical fuel oil breakdown for C, H and so on.

### RE: thermal conductivity of flue gas from furnace

(OP)
I really appreciate your reply, I'll try the combustion calculation. Yes, You're right about it's composition. I've tried to search the thread called chemical composition of fuel oil like you said, but it were hundreds of the results. thank again.

### RE: thermal conductivity of flue gas from furnace

You'll get hundreds of results as you found.  Fuel oil is not a very controlled substance because a lot of different streams are used to produce it subject to the various possible constraints (density, viscosity, CCR, sulfur, etc).  As such, you'll need to look for the local suppliers you'll be getting this from for a typical set of numbers.

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