FUELS AND COMBUSTION QUIZ

Bitumen

Molasses

Coal tar

None of these

All tar is evolved at < 600°C

All of these

Evolution of H₂ and formation of methane and aromatics occur at > 700°C

Hard semi-coke starts shrinking at 600°C

Natural gas

Sewage gas

Coal bed methane (CBM)

Liquefied petroleum gas (LPG)

Develops a non-luminous flame

Provides a lower rate of heat release

Can be done with less excess air

Develops a low temperature flame

Aliphatic tar is produced

Ammonia yield is more

All of these

Free carbon in tar is more

Badly affects the quality of steel

Reduces its calorific value

Increases its caking power

Is not undersirable

All of these

Adiabatic flame temperature

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

Heat release rate (thus requiring smaller combustion chamber)

Flame temperature

Amount of heat liberated

Flue gas temperature

Any of the above

Banking

None of these

Back draughting

Under pressurising

Foundary

None of these

Blastfurnace

Domestic