Discussion
Consider the following statements about kiln emissions.
1. Most carbon dioxide comes from calcination rather than fuel.
2. Nitrogen oxides form mainly at high flame temperature.
3. Dust emissions are controlled by adding water to the raw meal.
Answer: B
The first two are correct. The third names the wrong measure, since dust is controlled by bag filters or electrostatic precipitators rather than by wetting the feed. Wetting the meal would in any case cost fuel to evaporate again.
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