In a furnace operation, which is not preheated ?
Correct answer: C. Both A. and B.
- A. Solid fuels
- B. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
- C. Both A. and B.
- D. Neither A. nor B.
Explanation
Solid fuel cannot be conveniently preheated before firing, and hydrocarbon-rich fuel gases are generally not preheated because heating can cause cracking, carbon deposition or premature reactions. Therefore, both listed fuel types are excluded from preheating.
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