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A multi-stage preheater on a cement kiln reduces fuel consumption by

  • A.cooling the clinker with ambient air
  • B.grinding the raw meal more finely
  • C.increasing the rotational speed of the kiln
  • D.heating the raw meal with the kiln exhaust gas

Answer: D

The meal is calcined progressively in cyclones on its way down while the gas rises, so the kiln receives feed already hot and partly decarbonated. Adding stages recovers more but raises the pressure drop and the fan power.

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