13 Questions
Excess air is the amount of air supplied to a combustion process in addition to the theoretical air required for perfect combustion. It is calculated using the equation: excess air = \frac{{\text{{actual air supplied}} - \text{{theoretical air}}}},{{\text{{theoretical air}}}} \times 100%$
The relationship between excess air and theoretical air depends on the fuel and combustion process.
Which element requires the least amount of air for complete combustion?
Hydrogen
What is the combustion equation for hydrogen?
2H2 + O2 -> 2H2O
What is the molar mass of carbon dioxide (CO2)?
32 kg/kmol
What is the mass of air required for the combustion of 1 kg of carbon?
11.59 kg
Which equation represents the air-fuel ratio (AF)?
AF = mass of combustion air / mass of fuel
Which equation calculates the percent of excess air in terms of the air-fuel ratio?
Percent excess air = (supplied - theoretical) / theoretical x 100%
What is the theoretical air-fuel ratio for the perfect combustion of methane (CH4)?
17.2
If the air-fuel ratio for methane combustion in a particular boiler is 20.64, what is the percent of excess air supplied?
20%
According to the text, what is the mass of air required for the combustion of 1 kg of hydrogen?
34.78 kg air
According to the text, what is the mass of air required for the combustion of 1 kg of sulfur?
4.35 kg air
According to the text, what is the theoretical air required for the combustion of carbon, hydrogen, and sulfur?
10.27 kg air/kg fuel
According to the text, how is excess air calculated?
mass of air supplied - mass of theoretical air
Table 7 - Air Required for Combustion of Hydrogen Quiz: Test your knowledge on the calculation of air required for the combustion of hydrogen. Learn how to determine the mass of air needed for complete combustion and understand the relationship between oxygen and combustion air.
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