FUELS AND COMBUSTION QUIZ

Contains more volatile matter than bituminous coal

Is essentially a coking coal

Ignites more easily than bituminous coal

Burns with short, bluish, yellow-tipped flame producing very little smoke

N₂

CO

O₂

SO₂

Caking power

Neither A nor B

Both A & B

Calorific value

Supplying correct amount of combustion air

Reducing sulphur content in the fuel

Adopting proper fuel firing technique & fuel preparation

Preheating of fuel gases & combustion air

May damage the coke oven walls during carbonisation

Both B and C

Produce strong coke

Produce weak coke

Thick fire bed and preheated primary air

Low reactivity of carbonised residue containing high proportions of iron & sulphur

Low forced draught and fuel bed temperature

All of these

CH₄ & CO₂

CO & N₂

CH₄ & N₂

CO & CO₂

Flue gases

Incomplete combustion

Ash content in the fuel

Unburnt carbon in flue gases

Smaller fines are stored in large quantity

It contains large amount of volatile matter

All of these

It is stored in tall heaps

1.05 y

Y

1.8 y

0.95 y