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A regenerative glass furnace improves efficiency by using its waste gas to

  • A.preheat the combustion air in a refractory chequerwork
  • B.preheat the batch before it is charged
  • C.generate steam for the annealing lehr
  • D.dry the cullet before it is added

Answer: A

The gases heat a brick chequerwork for twenty minutes, then the flow reverses and the incoming air is heated by it, giving combustion air at over a thousand degrees. Batch and cullet preheating are separate measures applied on top.

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