In recent years, several R&D studies are dedicated to the reduction of nitrogen oxides which are formed by the reaction between the oxygen and the nitrogen present in the air during combustion.
ATS developed a good experience on how the neutralization of nitrogen oxides by realizing various applications:
- SNCR (Selective Non-Catalytic Reduction) directly inside the boilers
- SCR (Selective Catalytic Reduction) “high dust”
- SCR honeycomb tail end, or pellets low temperature reactors.
For the SCR system, the nitrogen oxides react, inside of the active centers of the catalyst, with ammonia (directly obtained by the use of 24.9% ammonia solution or derived from the dissociation of urea at high temperatures) to produce nitrogen (N2) and water vapor (H2O).
ATS has focused on various parameters in order to achieve efficient catalytic systems:
- NOx reduction yield,
- SOx content inside the flue gases,
- the working temperature,
- ammonia slip,
- fluidodynamic status (gas/reagent distribution),
- catalyst expected lifetime,
- regeneration requirements.
In particular, ATS is able to design and supply the following units:
- SCR DeNOx tail end unit
- SCR DeNOx "high dust" unit
- SNCR DeNOx systems
- Ammonia storage and dosage systems
- Urea to ammonia conversion unit