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A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
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
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
D. All A., B. and C.
Related Mcqs:
- The hottest part of the flame lies in its _______________ zone?
- A. Non-luminous B. Luminous C. Yellow D. Unburnt gases...
- Blast furnace gas compared to coke oven gas has_________________?
- A. Lower ignition temperature B. Narrower limit of inflammability C. Higher calorific value D. Lower theoretical flame temperature...
- Naphthalene is removed from coke oven gas by________________?
- A. Scrubbing with wash oil (a petroleum product) B. Adsorbing on bog iron bed C. Absorbing in vetro-coke solution D. None of these...
- Soft coke is not ___________________?
- A. Produced by low temperature carbonisation of coal B. A domestic fuel C. Used in blast furnaces D. None of these...
- A good coking coal should have high ______________ content?
- A. Ash B. Sulphur & phosphorus C. Moisture D. None of these...
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