Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?
Correct answer: B. 40
- A. 20
- B. 40
- C. 65
- D. 80
Explanation
A limestone-calcination rotary kiln typically has a thermal efficiency of roughly 40%, although the exact value varies with kiln design, insulation, feed, and heat recovery. Thus option b is the usual approximate value.
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