Flue Gas Denitrification Equipment: An Overview Flue gas denitrification equipment is a critical component in reducing nitrogen oxide (NOx) emissions from industrial processes, particularly in power plants, waste incineration facilities, and chemical manufacturing. NOx emissions contribute to air pollution, acid rain, and respiratory health issues, making their control essential for environmental compliance and public health protection. Key Technologies for Flue Gas Denitrification 1. Selective Catalytic Reduction (SCR) SCR is one of the most widely used denitrification methods. It involves injecting ammonia (NH₃) or urea into the flue gas stream, which reacts with NOx over a catalyst (typically vanadium or titanium-based) to form harmless nitrogen (N₂) and water (H₂O). SCR systems operate at high temperatures (300–400°C) and achieve NOx removal efficiencies of up to 90%. 2. Selective Non-Catalytic Reduction (SNCR) SNCR is a simpler, lower-cost alternative to SCR, suitable for smaller-scale applications. It injects ammonia or urea directly into the combustion chamber or flue duct at high temperatures (900–1100°C), where NOx is reduced to N₂ without a catalyst. However, SNCR has lower efficiency (30–70%) and requires precise temperature control. 3. Low-Temperature Denitrification Emerging technologies focus on reducing NOx at lower temperatures (below 200°C), making them suitable for industries with low exhaust temperatures. These systems use advanced catalysts or hybrid processes combining adsorption and chemical reduction. 4. Combined Desulfurization and Denitrification Some integrated systems simultaneously remove sulfur dioxide (SO₂) and NOx using wet or dry scrubbing techniques, improving cost-effectiveness and space efficiency. Equipment Components - Reactor Chamber: Houses the catalyst (in SCR) or provides the reaction zone (in SNCR). - Ammonia Injection System: Precisely controls reagent dosing for optimal NOx reduction. - Dust Removal Unit: Often installed upstream to prevent catalyst poisoning. - Monitoring & Control System: Ensures compliance with emission standards through real-time NOx measurement and process adjustments. Challenges & Future Trends Challenges include high operating costs (especially for SCR), catalyst degradation, and ammonia slip (unreacted NH₃ emissions). Future advancements may involve non-ammonia reagents, nanotechnology catalysts, and AI-driven optimization for better efficiency and lower costs. Flue gas denitrification equipment plays a vital role in sustainable industrial operations, helping industries meet stringent environmental regulations while minimizing ecological impact. Continuous innovation is key to enhancing performance and affordability in this field.