The process works by injecting a reagent (ammonia or urea) into the radiant and convection regions of a furnace to treat the flue gases, so the reduction reaction can take place.

The key to the SNCR process is having the reagent come in contact with the flue gas within a specific temperature window. For urea this window is approximately 980°C-1 150°C. For ammonia, the range is slightly lower at 850°C-980°C.

Selective Non-Catalytic Reduction has low cost capital equipment, and is extremely versatile. It offers competitive economic advantages to large SCR installations when combined with other technologies.

SNCR can be used in many industries including power, steel and other metal production, pulp and paper, petrochemical, waste to energy, glass and many others.