Moderate
The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
Correct answer: D. 85 to 90%
- A. 25 to 30%
- B. 40 to 50%
- C. 65 to 70%
- D. 85 to 90%
Explanation
With coal combustion plus heat-recovery equipment such as economisers, air preheaters and superheaters, modern boiler efficiency is typically about 85 to 90 percent. The lower ranges are more representative of overall plant efficiency, not boiler efficiency alone.
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