Which of the following is the most suitable for preheating combustion air above 650°C ?
Correct answer: C. Ceramic recuperator
- A. Regenerator
- B. Metallic recuperator
- C. Ceramic recuperator
- D. None of these
Explanation
Metallic recuperators lose strength and oxidation resistance at very high temperatures, whereas ceramic recuperators can withstand combustion-air preheating above about 650°C. A regenerator is also capable of high-temperature service, but the specified furnace-equipment choice is the ceramic recuperator.
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