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chemical engineering fuels and combustion
1. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
(A): it reduces its calorific value tremendously.
(B): it reduces its flame temperature tremendously.
(C): the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
(D): there are chances of explosion during preheating.
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