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A furnace's flue gas oxygen reads 12 per cent. The interpretation is

  • A.the combustion is starved of air
  • B.the fuel is of unusually high calorific value
  • C.the flue gas analyser needs recalibration
  • D.far too much excess air is being admitted

Answer: D

Twelve per cent oxygen corresponds to well over double the stoichiometric air, so a large mass of nitrogen and surplus oxygen is being heated and discarded. Trimming it toward two or three per cent is usually the single largest saving on such a furnace.

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