Primary air is that air which is used to_____________?
Correct answer: C. transport and dry the coal
- A. reduce the flame length
- B. increase the flame length
- C. transport and dry the coal
- D. provide air around burners for get¬ting optimum combustion
Explanation
Primary air carries pulverised coal from the mill to the burners and also dries it during transport. Air supplied around the burners for complete combustion is secondary air, not primary air.
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