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

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

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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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