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An air preheater recovers flue gas heat into the

  • A.feedwater entering the boiler drum
  • B.condensate returning from the plant
  • C.steam supplied to the process
  • D.combustion air entering the furnace

Answer: D

Hotter air raises the flame temperature and reduces the fuel needed, and the same heat is taken from gas that would have gone up the stack. Both devices are limited by the acid dew point below which the flue gas corrodes them.

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