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A waste heat recovery power plant at a cement works competes for gas with

  • A.the quarry, which in fact requires no hot gas at all
  • B.the packing plant standing at the end of the process
  • C.the laboratory that analyses the incoming raw meal
  • D.the raw mill, which uses the same hot gas for drying

Answer: D

Both need the preheater exhaust, so a works with wet raw materials has less heat available for power generation. The trade-off is settled case by case rather than by any general rule. Raw material moisture is usually the deciding factor.

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