The treatment of nitrogen oxides by SNCR (Selective Non Catalytic Reduction) allows the reduction of NO and NO2 in water and nitrogen. This reaction requires the addition of a reagent (NH2 molecule) and a temperature between 800 and 1050 ° C.


The reagent may be urea or ammonia, which respectively react according to the following reactions:

CO(NH₂)₂ + 2 NO + ½ O₂ ⇒ 2 N₂ + CO₂ + 2 H₂O    (Urea case)

4NH₃ + 4 NO + O₂ ⇒ 4 N₂  + 6 H₂O    (Ammonia case)

This reaction, to be effective, must be perfectly mastered in order to inject the reagent into the right temperature zone and with an optimal residence time in the equipment to be treated. It is also necessary to minimize ammonia slip to avoid problems of ammonium salt deposits.

The SNCR technology applies to any installation (furnace, boiler, process, etc.), to any power from 1 MW and to any fuel (natural gas, heavy fuel oil, coal, biomass, waste, etc.)

The SNCR process, offered by PROSSERGY, comes from 15 years of experience and development. Each installation is a special case and is the subject of a specific study:

• Customized design according to the installation to be treated
• NOx reduction efficiency up to 70% and above
• Reduced operating costs by optimizing the consumption of reagent and utilities
• High level of automation to reduce human intervention
• Very low maintenance costs
• Limited space requirement

PROSSERGY also optimizes and revamps existing installations.