A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?
Correct answer: D. Lack of thorough mixing of fuel with air
- A. Presence of large quantity of hydrogen in the fuel
- B. Low calorific value of the fuel
- C. High sulphur content in the fuel
- D. Lack of thorough mixing of fuel with air
Explanation
Even with excess air, incomplete contact between the fuel and air can leave carbon only partly oxidised, producing substantial carbon monoxide. Hydrogen content, calorific value and sulphur content do not by themselves explain the persistent high CO as well as poor mixing does.
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