Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because ________?
AIt reduces its flame temperature tremendously
BThe hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
CThere are chances of explosion during preheating
DIt reduces its calorific value tremendously
Correct answer
B. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
Explanation
The correct answer is The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.