Machine-translated by Google. Questions are authored in English.
Top

Discussion

The optimum excess air for a boiler is the level at which

  • A.the sum of the flue gas loss and the unburnt loss is least
  • B.the oxygen in the flue gas falls to zero
  • C.the flue gas temperature is at its lowest
  • D.the carbon monoxide in the flue gas is at its highest

Answer: A

Reducing air cuts the dry flue gas loss and eventually raises the unburnt loss, so the two curves cross at a minimum a few per cent of oxygen above stoichiometric. Chasing zero oxygen produces carbon monoxide and soot and costs more than it saves.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.