GBA may provide flue gas treatment units as part of a thermal oxidizer package, depending on the relevant requirements, in co-ordination with our system integrators, highly specialized on these types of units.
When low NOx burners themselves do not allow to meet Nitrogen Oxide emission standards, we may provide de-NOx systems based on selective non-catalytic reaction (SNCR) or selective catalytic reaction (SCR).
The SNCR reactor is based upon the injection of Ammonia or Urea aqueous solutions into the hot flue gas (~1000°C, 1832°F) and promotes the homogenous reduction of Nitrogen Oxides into Nitrogen and Water Vapor with abatement efficiencies of up to 90%. When the emission limits are more stringent, and the process allows, GBA designs and supplies SCR reactors, which are characterized by very high abatement efficiencies.
These catalytic reactors support the heterogeneous reaction on a Vanadium pentoxide catalyst bed (V2O5) or other active catalitic component, between Ammonia or Urea water solutions, sprayed in the hot gas (about 300°C, 572°F) few straight diameters upstream the unit, and Nitrogen Oxides, which are reduced to molecular Nitrogen.
GBA can also associate other flue gas treatment units based on quencher/wet scrubbing, dry scrubbing, bag houses for filtration, and other technologies when the gaseous effluents from the thermal oxidizer acid gases (such as Sulfur Dioxide, Hydrogen Chloride, Chlorines, etc.) or particulate matter, solid inorganic particles, and need further treatment before being discharged into the atmosphere.