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Flue gas conditioning with sulphur trioxide is used to

  • A.Raise the gas temperature
  • B.Reduce the pressure drop
  • C.Neutralise acid in the gas
  • D.Lower a high dust resistivity

Answer: D

A thin conductive film on the particle surface brings the resistivity back into the workable window and restores collection. It became common when low sulphur coals were adopted and precipitator performance fell away unexpectedly.

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