Fuels and Combustion - Chemical Engineering Questions and Answers

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Coke ovens in steel plant are heated by

electricity

coke oven gas

mixed gas

both(b) & (c)

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Coke oven gas is a better fuel than blast furnace gas, because of its higher

calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity).

adiabatic flame temperature.

heat release rate (thus requiring smaller combustion chamber).

all (a), (b) and (c).

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Short/intense flame is produced during combustion of gaseous fuel by using

high amount/current of combustion air.

low amount/current of combustion air.

preheated secondary air.

very little excess air.

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By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

tar

benzol

ammonia

none of these

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Naphthalene is removed from coke oven gas by

scrubbing with wash oil (a petroleum product).

adsorbing on bog iron bed.

absorbing in vetro-coke solution.

none of these.

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Coke oven gas compared to blast furnace gas is

more explosive and inflammable.

less poisonous.

lighter.

all (a), (b) and (c).

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Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind ?

100

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Which is the heaviest fuel gas out of the following ?

Blast furnace gas

Coke oven gas

Water gas

Carburetted water gas