FUELS AND COMBUSTION QUIZ

150

1500

5000

3500

Pulverised

Non-caking

High ash

Caking

All of these

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

Is non-coking

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Has a high volatile matter content and burns with a luminous smoky flame

All of these

NCV at constant pressure

GCV at constant pressure

GCV at constant volume

NCV at constant volume

Sewage gas

Natural gas

Coke oven gas

Blast furnace gas

Neither A nor B

Both A & B

Fussain

Vitrain

Bituminous coal

Aanthracite

Semi-bituminous coal

Coke

Iron blast furnace

Domestic ovens

Sinter making

Cupola in foundaries

Lengthens the flame

Causes heat loss of fuel by its partial combustion

Both A & B

Shortens the flame