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Theoretical air is the amount that

  • A.exactly satisfies the combustion stoichiometry
  • B.is actually supplied to the furnace itself
  • C.leaves in the flue gas quite unreacted
  • D.gives the highest flame temperature in practice

Answer: A

Correct answer: exactly satisfies the combustion stoichiometry

Theoretical air - also called stoichiometric air - is the quantity the balanced equations require, with no more and no less oxygen than the fuel can consume. It is a calculated reference, not what is actually supplied: real furnaces run on more than it, and the difference is the excess air on which every efficiency calculation turns.

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