Fuels and Combustion
Combustion of pulverised fuel

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Suppresses the discharge of fine dust and grit into atmosphere
All of these
Requires larger combustion chamber than rich gaseous fuel

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Fuels and Combustion
A coal with high ash content is undesirable, as

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

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