Primary air in combustion systems refers to the airflow directed to__________________?
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Answer: B. transport and dry the coal
Explanation
Primary air in pulverized coal combustion systems is used to dry the coal and transport it to burners. This initial airflow carries pulverized fuel particles directly through piping into the furnace combustion zone. Moisture removal during transport ensures stable ignition and efficient combustion inside the boiler furnace. Pulverized coal systems grind raw coal into fine powder before mixing it with primary combustion air streams. Secondary air is introduced separately around the burners to complete the overall combustion chemical reaction. Primary air fans supply the necessary pressure head to overcome frictional losses in fuel transport piping.
Providing air around burners for optimum combustion describes secondary air functions rather than primary air transport. Converting carbon monoxide into carbon dioxide in higher furnace zones is the role of overfire or tertiary air. Forced draft fans supply both primary and secondary air streams, making general fan delivery distinct from drying coal.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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