A coal with high ash content is undesirable, as________________?

A. causes its spalling due to different co-efficient of expansion/contraction of the refractory

B. the ash

C. All A., B. and C.

D. The ash retains the sulphur & phosphorus and thus affects the quality of products in

E. boiler tubes thereby reducing the heat transfer

F. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace

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