Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
Correct answer: B. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
- A. It reduces its calorific value tremendously
- B. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
- C. It reduces its flame temperature tremendously
- D. There are chances of explosion during preheating
Explanation
Preheating hydrocarbon-containing fuel gases can crack the hydrocarbons and deposit carbon soot, choking or fouling heat-transfer surfaces. This fouling risk is the main reason such gases are generally not preheated.
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