- #1
gdgt
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Hopefully one of you guys can help me out..
I'm designing a burner that will run off powdered biofuel and I'm trying to calculate the resulting temperature after combustion. I have a higher heating value (HHV) of around 10,000 BTU/lb for the biofuel and for a complete stoichiometric combustion will need 6.2 pounds of air per pound of fuel.
My thinking is, that burning one pound of fuel will release 10,000 BTU's of energy which will heat the air. Using a simple heat balance and assuming constant specific heat:
10,000 (BTU)= 6.2 (pounds of air) * .24 (BTU/lb/F) * (T_final - 75F)
And solving for T_final...
T_final = 6645.43F
This seems way too hot so I'm pretty sure I'm doing something wrong here. I'm just looking for a rough approximation of the final temperature which I feel should be around 2000F. I'm probably using the heating value wrong and I think the final temperature might have something to do with the adiabatic flame temperature but I'm not sure. Anyone have any thoughts or recommendations?
Any help would be greatly appreciated!
Thank you
I'm designing a burner that will run off powdered biofuel and I'm trying to calculate the resulting temperature after combustion. I have a higher heating value (HHV) of around 10,000 BTU/lb for the biofuel and for a complete stoichiometric combustion will need 6.2 pounds of air per pound of fuel.
My thinking is, that burning one pound of fuel will release 10,000 BTU's of energy which will heat the air. Using a simple heat balance and assuming constant specific heat:
10,000 (BTU)= 6.2 (pounds of air) * .24 (BTU/lb/F) * (T_final - 75F)
And solving for T_final...
T_final = 6645.43F
This seems way too hot so I'm pretty sure I'm doing something wrong here. I'm just looking for a rough approximation of the final temperature which I feel should be around 2000F. I'm probably using the heating value wrong and I think the final temperature might have something to do with the adiabatic flame temperature but I'm not sure. Anyone have any thoughts or recommendations?
Any help would be greatly appreciated!
Thank you