A coal with high ash content is undesirable, as * it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber. all of the three 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 thereby reducing the heat transfer. 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 ash.

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gd day. please help me with this one.. this is just a practice for our upcoming finals... please answer directly no need for explanation.

A coal with high ash content is undesirable, as
it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber.
all of the three
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 thereby reducing the heat transfer.
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 ash.
Transcribed Image Text:A coal with high ash content is undesirable, as it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber. all of the three 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 thereby reducing the heat transfer. 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 ash.
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