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Sulphur in a fuel matters in a combustion calculation because it

  • A.does not burn at all in the furnace
  • B.raises the calorific value substantially
  • C.prevents the formation of carbon dioxide
  • D.consumes oxygen and forms sulphur dioxide

Answer: D

Correct answer: consumes oxygen and forms sulphur dioxide

Sulphur burns to sulphur dioxide, so it adds to the theoretical oxygen requirement and appears in the flue gas - both of which the calculation must account for. It also matters beyond the arithmetic: the sulphur dioxide raises the acid dew point of the flue gas, which sets how far the exhaust may be cooled before the heat exchangers begin to corrode.

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