SCR / SNCR
Nitrogen Oxides (NOx) Removal
EPA regulations support or require NOx control installations to achieve the lowest emissions level possible. One of the solutions for post-combustion control systems is Selective Non-Catalytic Reduction (SNCR). With this technology, NOx is reduced to nitrogen (N2) and water (H2O) through a series of reactions with a reagent (or reagents) injected into the flue gas. The most common reagents used in commercial applications are ammonia and urea.
The stoichiometric reaction using ammonia for a selective reduction process is:
4NO + 4NH3 + O2 → 4N2 + 6H2O
2NO2 + 4NH3 + O2 → 3N2 + 6H2O
NO + NO2 + 2NH3 → 2N2 + 3H2O
The optimal temperature range for the SNCR injection of ammonia hydroxide is 900°C-1000°C (1650°F-1830°F) and for urea it is 950°C – 1050°C (1740°F-1920°F).
Dustex Scope for DeNOx Systems
Our team of project engineers and designers work closely with your engineering team to ensure that all specifications and requirements of the SNCR are seamlessly integrated to the system. Dustex’s NOx control systems can be supplied as turnkey solutions including pump & control skids, injection lances & atomization nozzles, control equipment & PLC, catalyst (SCR only), NH₃ storage tank, and truck unloading station.