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The oxygen content of the kiln exhaust gas is monitored in order to

  • A.confirm that combustion is complete without excess air
  • B.measure the calcium oxide content of the finished clinker
  • C.establish the fineness of the raw meal being fed in
  • D.determine when the refractory lining needs replacing

Answer: A

Too little oxygen leaves fuel unburnt and produces carbon monoxide, while too much wastes heat in warming surplus air. The operator works within a narrow band between the two faults. Continuous oxygen measurement is what makes holding that band possible.

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