High ash coals ____________________?
Correct answer: B. Require longer time of carbonisation as ash offers resistance to heat transfer
- A. Are soft & friable (poor strength and size stability)
- B. Require longer time of carbonisation as ash offers resistance to heat transfer
- C. Produce larger quantity of coke oven gas
- D. None of these
Explanation
Ash is largely mineral matter and acts as a thermal barrier inside the coal charge, so heat penetrates more slowly and carbonisation takes longer. The other choices are not general consequences of high ash content.
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