How can NOx emissions be reduced?
Primary operational measures such as low-NOx burner and calciners or water injection can reduce NOx emissions to a limited extent. Best available technology to reduce NOx emissions are selective non-catalytic reduction (SNCR) with ammonia or urea injection in an appropriate temperature window. Using this technology NOx emissions below 800 mg/Nm3 with existing suspension preheater / precalciner kilns, and even less than 500 mg/Nm3 with new SP/PC kilns are achievable.
