Function of secondary air in pulverised coal firing is to_________________?
Correct answer: D. Ensure efficient burning of coal around the burner
- A. Transport the coal to the burner
- B. Dry the coal
- C. Reduce primary air requirement
- D. Ensure efficient burning of coal around the burner
Explanation
Primary air carries and partly dries the pulverised coal, whereas secondary air supplies additional oxygen around the burner for thorough mixing and efficient combustion. Hence its main function is to ensure efficient burning near the burner.
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