Discussion
Consider the following statements about kiln heat recovery.
1. Preheater exhaust gas is used to dry raw materials.
2. Cooler air returns to the kiln as secondary and tertiary air.
3. Heat leaving with the clinker cannot be recovered at all.
Answer: B
The first two describe standard practice. The third is wrong, since recovering heat from the hot clinker is precisely what the cooler exists to do. Recovered cooler air returns to the kiln and calciner as combustion air.
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