Ultimate Analysis: Find RAF & RGF with Excess Air 20%

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To calculate the RAF (Relative Air-Fuel) and RGF (Relative Gas-Fuel) with a given ultimate analysis of fuel, one must first determine the stoichiometric air required for complete combustion. With 20% excess air, this means the actual air used will be 120% of the stoichiometric requirement. For calculating SO2 and particulate matter, the excess air affects the combustion efficiency and the resultant emissions, requiring adjustments in the calculations. It's essential to apply the excess air factor when determining the concentrations of SO2 and particulate matter based on the combustion products. Understanding these relationships is crucial for accurate emissions assessment in combustion processes.
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Homework Statement



given the ultimate analysis of the fuel

c - 88.3%
h - 9.5%
o -
n -
s - 1.4%
ash - 0.8%

find the:

a. raf and rgf
b. concentration of so2 and particulate matter if excess air is 20%.

i know how to calculate the raf and rgf, i also know how to compute the so2 and particulate
matter but i don't know to compute them if excess air is given.

what should i do to the excess air = 20%?
 
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who knows what should i do?
 
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