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A modern preheater and precalciner kiln typically consumes about

  • A.as much as 30,000 megajoules per tonne of clinker
  • B.no fuel at all once it has been brought up to heat
  • C.3,000 to 3,500 megajoules per tonne of clinker
  • D.only 300 to 350 megajoules per tonne of clinker

Answer: C

The theoretical minimum for the chemistry is around 1,750, so even a good kiln uses roughly twice what thermodynamics demands. Older wet kilns consumed half as much again as a modern dry one. The gap is almost entirely accounted for by evaporating slurry water.

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