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Gas and material in a rotary kiln flow

  • A.in no consistent direction at any point along the kiln
  • B.in opposite directions, counter-current to one another
  • C.in the same direction throughout the whole length of the kiln
  • D.in the same direction but only within the burning zone itself

Answer: B

Correct answer: in opposite directions, counter-current to one another

The meal enters cold at the upper end and the flame burns at the lower, so the gas travels up the kiln against the descending charge. That arrangement puts the hottest gas against the hottest material and the coolest against the coolest, which is what makes the heat transfer efficient over the whole length.

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