In the fields of distributed energy and backup power, nitrogen oxide (NOx) emissions from Generator Sets remain a primary focus of environmental regulations. Due to highly variable operating conditions and load fluctuations, traditional single-stage denitrification systems often struggle to maintain high DeNOx efficiency while strictly controlling ammonia slip.

By integrating SCR (Selective Catalytic Reduction Catalyst) and ASC (Ammonia Slip Catalyst), enterprises can comply with the most stringent emission standards while ensuring the safety of the production environment.

1. SCR Technology: The Core of Efficient DeNOx

SCR (Selective Catalytic Reduction) technology is currently the most widely used and mature solution for NOx reduction in industrial exhaust gas treatment.

• Reaction Mechanism: In the presence of a reducing agent (typically urea solution), the SCR catalyst converts NOx in the exhaust into harmless nitrogen (N₂) and water (H₂O).

• Operational Adaptability: High-performance SCR catalysts must feature a wide operating temperature window to accommodate varying exhaust temperatures from cold start to full load.

• Key Specifications: In practical selection, specific honeycomb or plate structures are often employed based on system space to optimize the catalytic contact area.

2. ASC Catalyst: The Vital Defense Against Ammonia Slip

To achieve high DeNOx rates, excessive ammonia injection often leads to unreacted ammonia escaping with the exhaust, known as "Ammonia Slip". This causes resource waste and potential secondary pollution.

• Eliminating Odor and Corrosion: The ASC (Ammonia Slip Catalyst) is specifically designed to capture and oxidize this residual ammonia, converting it into nitrogen and water.

   

• Synergistic Effect: Implementing ASC at the downstream of the SCR allows the system to tolerate higher ammonia-to-nitrogen ratios, enabling more thorough NOx removal at the upstream without exceeding ammonia emission limits.

3. Stability in Complex Conditions and Selection Advice

Generator sets in petrochemical and chemical enterprises often encounter exhaust containing impurities or fluctuating components, demanding higher reliability from catalysts.

• Anti-poisoning Design: For petrochemical applications, SCR and ASC substrates must exhibit excellent sulfur resistance and thermal stability to prevent active sites from being covered by chemical impurities.

   

• Parameterized Selection: When designing for Industrial Exhaust Gas Treatment, parameters such as Gas Hourly Space Velocity (GHSV) and light-off temperature must be strictly verified to ensure efficacy even during low-load operations.

   

• Life-cycle Maintenance: Combined with professional services from the Catalyst Cleaning Industry, periodic removal of accumulated dust from the substrate surface can significantly extend the service life of SCR and ASC components.