Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?
Correct answer: B. Risk of explosion
- A. Requirement of large volume combustion chamber
- B. Risk of explosion
- C. Chances of clinker formation
- D. Incomplete combustion of coal
Explanation
Pulverised coal forms a combustible dust-air mixture, and excessive preheating can ignite this mixture inside the conveying system. The temperature is therefore limited mainly to reduce explosion risk.
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