Discussion
State whether the following is true or false.
A cement kiln can be started and stopped quickly like a boiler.
Answer: C
Correct answer: False
A kiln contains hundreds of tonnes of refractory that must be heated and cooled slowly, or it will spall and crack from thermal shock. Warming up takes a day or more, and cooling down as long. That is why an unplanned stop is so expensive and why plants run continuously for months between outages.
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