Chemical Engineering :: Fuels and Combustion
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A coal having high amount of volatile matter
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Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?
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Natural draught produced by a chimney depends upon the
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Gross & net calorific value is the same for
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Higher percentage of ash in coal meant for the production of metallurgical grade coke
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Combustion of pulverised coal as compared to that of lump coal
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A coal with high ash content is undesirable, as
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Presence of free moisture in coal during its high temperature carbonisation
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A.
it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber.
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B.
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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C.
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.
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D.
all (a), (b) and (c).
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