Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

A The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B It reduces its calorific value tremendously
C It reduces its flame temperature tremendously
D There are chances of explosion during preheating

Correct Answer: The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

Bissoy MCQ
#Chemical Engineering #Fuels and Combustion

Related Questions

Coke oven gas is a better fuel than blast furnace gas, because of its higher
A Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B Adiabatic flame temperature
C Heat release rate (thus requiring smaller combustion chamber)
D All of the above
Width of the coke oven towards coke side is slightly more than that on pusher side to
A Facilitate easy discharging of coke as it swells during carbonisation
B Facilitate uniform heating of the oven
C Increase the output of the coke
D None of these
Coke oven gas consists mainly of
A H2 & CH4
B CO & CO2
C H2 & CO
D CH4 & CO
Coke oven gas constitutes mainly of
A H2 & CO
B H2 & CH4
C CH4 & CO
D H2 & CO2
Blast furnace gas compared to coke oven gas has
A Lower ignition temperature
B Narrower limit of inflammability
C Higher calorific value
D Lower theoretical flame temperature
Coke oven gas compared to blast furnace gas is
A More explosive and inflammable
B Less poisonous
C Lighter
D All of the above
Coke oven gas burns with an yellowish flame, because of the presence of
A CO2
B CH4
C H2
D NH3
Naphthalene is removed from coke oven gas by
A Adsorbing on palladium
B Absorbing in ethanolamine
C Scrubbing with wash oil
D Passing it through electrostatic precipitator
Hydrogen content of coke oven gas is __________ percent.
A 4
B 22
C 58
D 84
Flushing liquor used for cooling coke oven gas constitutes of
A Ammoniacal liquor
B K2CO3 solution
C Dilute H2SO4
D Dilute HCl

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