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Selective non-catalytic reduction controls nitrogen oxides by

  • A.injecting ammonia or urea into a hot gas stream
  • B.cooling the flame down with a water spray alone
  • C.filtering the exhaust gas through a fabric bag
  • D.adding ground limestone into the exhaust duct

Answer: A

The reagent reacts with the oxides to give nitrogen and water within a fairly narrow temperature window, which the preheater conveniently provides. A catalytic version works at lower temperature but costs considerably more.

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