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Ammonia slip refers to

  • A.Excess ammonia collected in the ash
  • B.Unreacted ammonia leaving with the flue gas
  • C.Ammonia leaking from storage
  • D.Ammonia condensing in the duct

Answer: B

Injecting more reagent than the reaction consumes raises removal but sends the excess up the stack, where it forms ammonium salts and fouls downstream equipment. The trade between removal and slip is the central control problem of both reduction processes.

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