Furnace modeling
 

Hi all,
I'm approaching to simulate a drying plant, in particular I have to simulate a oil pomace drying process.

The combustion is made in a fixed bed furnace from dry oil pomace. I'm interested in simulate the iteration between flame (radiant heat transfer), exhaust gas from combustion (convective heat transfer) and the undried oil pomace.

I know that simulate heterogenous combustion is a real pain and i'm not interested in doing this. There is a way to simulate radiant and convective heat transfer without simulate combustion? any advice trying to keep information on flames?
It's important to evaluate the radiant heat iteration.

Thank you

Furnace model:

http://i64.tinypic.com/2mmzkty.png

cyan: primary and secondary air
red: exhaust gas

No one can help me? :)