The main function of primary air in pulverised coal fired burner is to_________________?
Correct answer: C. Dry and transport the coal
- A. Burn CO to CO2
- B. Have proper combustion by supplying it around the burner
- C. Dry and transport the coal
- D. Preheat the tertiary air used for complete combustion of CO to CO2
Explanation
Primary air is mixed with pulverised coal before or at the burner and serves to dry and carry the fine coal into the furnace. Additional secondary air supplies most of the air needed for final combustion.
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