In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of_________________?
Correct answer: C. Combustion of coal by supplying it around the burner
- A. Transportation of coal
- B. Drying of coal
- C. Combustion of coal by supplying it around the burner
- D. Preheating the primary air
Explanation
Primary air carries and often dries the pulverised coal, whereas secondary air is introduced around the burner to supply the oxygen needed for combustion. Hence its main purpose is combustion support.
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