Calculation of Furnace heat duty
Calculation of Furnace heat duty
(OP)
Dear colleagues
I would like to know where i would be able to get formulae for calculating furnace heat duty.
I would like to know where i would be able to get formulae for calculating furnace heat duty.





RE: Calculation of Furnace heat duty
Jack Hardie
RE: Calculation of Furnace heat duty
You could also approach the heat absorbed from the flue gas side, which means looking at the efficiency of the heater from the stack temperature, excess oxygen and air preheat temperature (if provided.) Simple equations exist for this. Once you have the efficiency, look at the measured fuel flow rates (need to know if these are accurate!) and heat values for the fuels. Calculate the heat fired from fuel flow and heat value of fuel. Multiply this by efficiency and you have heat absorbed or duty.