The ASC Ammonia Slip Catalyst is a high-performance environmental solution designed specifically
for advanced emission control in gas turbine and industrial boiler
systems. As global emission standards tighten, managing "ammonia
slip"—the unreacted ammonia (NH3) that bypasses the SCR (Selective
Catalytic Reduction) process—has become critical for operational
efficiency and environmental compliance.
Product Introduction & Usage
In the gas turbine denitrification process, excess ammonia is often
injected to ensure NOx levels meet strict regulatory targets. This
excess NH3 can lead to equipment corrosion and environmental
pollution. The GRACE ASC catalyst is strategically installed downstream of the SCR system. Its
primary function is to capture and convert escaping ammonia into
harmless nitrogen (N2) and water vapor (H2O) through highly
selective catalytic oxidation.
Technical Advantages
High Conversion Efficiency: Ensures ammonia emissions remain below 3ppm, meeting the most stringent international air quality standards.
Low Pressure Drop Design: Tailored for high-exhaust-volume environments, the GRACE solution minimizes backpressure to maintain peak engine thermal
efficiency.
Synergistic Emission Reduction: Beyond eliminating ammonia odors, it inhibits the generation of
secondary NOx and prevents the formation of ammonium bisulfate
(ABS).
Wide Temperature Adaptability: Maintains high catalytic activity across a broad temperature
range, making it ideal for fluctuating exhaust conditions.
| Parameter | Standard Specification |
| Catalyst Type | ASC (Ammonia Slip Catalyst) |
| Active Components | Precious Metal / Composite Metal Oxides |
| Efficiency (NH3 Removal) | >=90% |
| Operating Temperature | 280°C – 450°C |
| Pressure Drop | < 100 Pa (Application Dependent) |
| Support Material | Honeycomb Ceramic |
Process Flow & Installation
Exhaust Entry: Flue gas containing NOx and escaped NH3 passes through the SCR
stage.
Catalytic Oxidation: The gas enters the GRACE ASC layer downstream.
Selective Conversion: NH3 reacts with residual oxygen to form N2 and H2O.
Clean Discharge: Purified exhaust gas exits the stack without the risk of
downstream fouling.
Operation & Maintenance
To ensure longevity, operators should monitor the pressure
differential across the catalyst bed regularly. GRACE catalysts are designed for durability, but preventing soot
accumulation and maintaining stable exhaust temperatures will
maximize the catalyst's service life.
After-Sales & FAQ
Q: Does the ASC increase NOx emissions? No. Our advanced selective oxidation technology specifically
inhibits secondary NOx formation.
Q: Can this be retrofitted into existing SCR systems?
Yes, the low-profile design of GRACE catalysts allows for easy integration into existing flue gas ducts
with minimal modifications.
Service Support: We provide comprehensive site evaluations, catalyst activity
testing, and replacement services to ensure your system remains in
100% compliance.
