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Fuels and Combustion

Fuels and Combustion
Which is the most matured coal?

Lignite
Anthracite
Bituminous
Semi-anthracite

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Fuels and Combustion
Increase in ash content of blast furnace coke

Does not affect its consumption in the furnace
Increases its consumption in the furnace
Reduces its consumption in the furnace
Decreases its hardness and abrasion resistance

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Fuels and Combustion
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

8800 kcal/m³
Same as that of coal middling
25000 kcal/kg
8800 kcal/kg

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Fuels and Combustion
Higher efficiency in the combustion of solid fuel can not be achieved by

Supplying correct quantity of combustion air
Adopting efficient-fuel firing technique & equipment
Keeping the flue gas exhaust temperature very high
Proper fuel preparation

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Fuels and Combustion
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

Aromatic content of tar produced is more
Tar yield is more
Ignition temperature of coke produced is less
Gas yield is less

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Fuels and Combustion
Ammonia content in raw coke oven gas is about __________ gm/Nm³.

1
50
15
100

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