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The main burner of a rotary kiln is designed to produce

  • A.no flame at all, but only radiant heat from the walls
  • B.a stable flame of controlled length and shape
  • C.the shortest possible flame in every set of conditions
  • D.a flame that fills the entire length of the kiln

Answer: B

Correct answer: a stable flame of controlled length and shape

The flame determines where the peak temperature falls along the kiln, and that in turn determines where the coating forms and how the clinker is burnt. The burner is designed so that length and shape can be adjusted through the primary air and the momentum, and stability matters as much as either.

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