With the continuous upgrading of national environmental protection policies, especially the full implementation of "ultra-low emission" standards in high-pollution industries such as thermal power, steel, and cement, companies are generally concerned about whether existing desulfurization and denitrification facilities have the ability to meet these higher requirements. From a technical point of view, modern desulfurization and denitrification facilities are fully capable of meeting ultra-low emission requirements under certain conditions, but they still need to be upgraded or modified in terms of equipment configuration, system optimization, and operation management. The following is analyzed from several key aspects:
1. Existing mainstream technologies have the basis to meet the standards
The currently widely used wet limestone-gypsum desulfurization technology can achieve an SO₂ removal efficiency of more than 95%, and even more than 98% under optimized conditions, which can meet the "Emission Standards for Air Pollutants from Thermal Power Plants" 》The ultra-low emission limit requirement of less than 35mg/Nm³ in the "Selective Catalytic Reduction (SCR) denitrification technology can achieve a NOₓ removal rate of 80% to 95% in industrial applications, and can also achieve an ultra-low standard of NOₓ emission concentration below 50mg/Nm³, especially under the conditions of precise control of smoke temperature and reducing agent, the efficiency is more significant.
2. Facility upgrades can significantly improve performance
The desulfurization and denitrification systems invested and built by some companies in the early stage are mostly designed according to relatively loose emission standards. If they directly deal with ultra-low emissions, there may be problems such as low absorbent utilization, catalyst aging, and insufficient system capacity. However, through appropriate technical modifications, such as replacing high-efficiency catalysts, increasing the number of catalyst layers, upgrading the slurry circulation system, and optimizing the flue gas flow field design, it can be significantly improved. Improve system operating efficiency and stability to meet new emission requirements. For example, thermal power plants generally achieve ultra-clean emissions by installing wet electrostatic precipitators (WESP) or adding desulfurization tower demisters.
3. System operation and automated control are key guarantees
Even if the equipment itself has ultra-low emission potential, if the operation and management are not in place, it may lead to reduced efficiency and emission fluctuations. Therefore, achieving stable compliance must rely on high-level automatic control systems and operation and maintenance capabilities. For example, through the linkage of the flue gas continuous emission monitoring system (CEMS) and the DCS system, real-time feedback and automatic adjustment of desulfurization and denitrification efficiency can be achieved to ensure that key parameters (temperature, pH value, ammonia nitrogen dosage, etc.) are always in the optimal reaction range.
4. Integrated collaborative governance has more advantages
For comprehensive To achieve ultra-low emissions, more and more companies are adopting an integrated design of "dust removal + desulfurization + denitrification + white elimination". This type of combined system not only improves space utilization, but also reduces energy and material consumption through synergy, and improves overall purification efficiency. For example, a wet dust collector can have both dust removal and further desulfurization, and flue gas cooling can also improve the SCR denitrification efficiency, which has significant economic and environmental benefits.
Conclusion:
Modern flue gas desulfurization and denitrification facilities have the technical basis for achieving ultra-low emissions. The key lies in whether they have been reasonably designed and optimized in operation. For some old devices, system upgrades and renovations are required to truly achieve long-term, stable and compliant ultra-low emission goals. This is not only a challenge to the environmental protection capabilities of enterprises, but also an important opportunity to promote green and low-carbon transformation.