The function of secondary combustion air is to ______________________?
Correct answer: B. Completely burn the volatile matter
- A. Pneumatically convey the pulverised coal
- B. Completely burn the volatile matter
- C. Burn the lumpy coal
- D. None of these
Explanation
Primary air supports ignition and partial combustion, while secondary air is admitted above the fuel bed to supply oxygen for burning the released volatile matter completely. It is therefore not mainly used to convey coal or burn the larger coal lumps.
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