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Flue gas cannot be cooled indefinitely in a heat recovery device because below the acid dew point

  • A.sulphuric acid condenses and corrodes the surfaces
  • B.the gas becomes too dense to be moved by the fan
  • C.the carbon monoxide content rises sharply
  • D.the draught available at the chimney disappears

Answer: A

Sulphur in the fuel gives sulphur trioxide, which with water vapour condenses as acid on any surface below its dew point, and the metal is attacked rapidly. It is the reason stack temperatures are held well above ambient on sulphur-bearing fuels.

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