高炉热风炉氮氧化物生成机理及控制分析

Formation Mechanism and Control Analysis of Nitrogen Oxides in Hot Blast Stove

从热力型NOx生成机理出发,分析了热风炉在不同阶段的NOx生成情况。研究表明:燃烧中心区温度、气体在高温区停留时间和过氧量、换炉时间都会影响NOx的产生;其中,中心区温度的影响最为显著,温度每升高100℃,NOx生成速率增加7~9倍。燃烧器的低氮燃烧、高效的蓄热材料、智能燃烧控制、废气回收等技术的应用可有效控制NOx排放。

Based on the thermal NOx formation mechanism,the NOx reaction rate of hot blast stove during different stages is analyzed.The results show that the NOx emissions is affected by the temperature of combustion center,the residence time and oxygen enrichment rate in high temperature zone,and the time of conversion period;among them,the temperature is the most significant factor,and the NOx reaction rate is increases 7~9 times when the temperature is increased 100℃.The application of technologies such as low-nitrogen combustion technology,high-efficiency heat-storing materials,intelligent combustion control technology,and exhaust gas recovery technology can effectively control NOx emission.