Discussion
A high ash content in coal is objectionable chiefly because it
Answer: A
Correct answer: lowers the calorific value and must be handled and disposed of
Ash is incombustible mineral matter, so every kilogram of it in the coal is a kilogram that contributes no heat - the calorific value falls in proportion. It then has to be removed from the grate, carried away and disposed of, and it fouls heat transfer surfaces on the way. Both the loss of heating value and the handling cost count against a high ash coal.
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