SNCR NOx reduction systems
Selective non catalytic reduction (SNCR) is a technology used to reduce the level of nitrogen oxides (NOx) without the presence of a catalyst. Reagent (Ammonia or Urea) is injected directly into flue gas and reacts with NOx resulting in nitrogen (N2) and water (H2O).
NO2 + NO + 2 NH3 ↔ 2 N2 + 3 H2O
4 NO + 4 NH3 + O2 ↔ 4 N2 + 6 H2O
2 NO2 + 4 NH3 + O2 ↔ 3 N2 + 6 H2O
Selective non-catalytic reduction (SNCR) is an alternative solution when the operating conditions are not suitable for a catalyst.
When is SNCR applicable?
With the proper process conditions, Yara’s SNCR technology can easily reduce NOx emissions between 60% to 90% while maintaining the lowest possible NH3 slip. Some of the recommended conditions are:
- Temperatures of the flue gas shall be between 800 °C and 1100 °C
- Residence time > 0.5 sec
- Accessibility for the injectors
Why choose Yara?
With near 300 references in green field and retrofits SCR installation globally, we can meet your needs from design and fabrication to installation and commissioning. YARA SCR systems are capable of reaching the most stringent requirements and are present in all major industries: Coal, Oil and Gas fired Power plants, Waste to Energy, Biomass, Petrochemicals and various industrial applications.
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