In combustion analysis, what is the primary purpose of supplying excess combustion air?

• A. To reduce the temperature of the combustion reaction
• B. To increase the concentration of carbon monoxide in the products
• C. To ensure complete oxidation of the fuel
• D. To minimize the production of water vapor

Answer: (C)

Verified step by step guidance

1. Understand that combustion analysis involves burning a fuel completely to determine its composition by analyzing the products formed.
2. Recognize that supplying excess combustion air means providing more oxygen than the exact amount needed for the stoichiometric combustion reaction.
3. Know that the primary purpose of excess air is to ensure that all the fuel molecules have enough oxygen to react completely, preventing incomplete combustion products like carbon monoxide.
4. Realize that incomplete combustion can produce harmful or undesired products such as carbon monoxide, so excess air helps achieve complete oxidation to carbon dioxide and water.
5. Note that while excess air can affect temperature and product concentrations, its main role is to guarantee complete oxidation of the fuel during combustion analysis.