Discussion
Coating formation on the refractory in the burning zone is
Answer: B
Correct answer: generally desirable, as it protects the brick
A layer of clinker freezing onto the lining insulates the brick and takes the abrasion in its place, so a stable coating greatly extends refractory life. The operator works to keep it: too cold and it will not form, too hot and it melts away, and the loss of coating shows at once as a hot spot on the shell.
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