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对某热媒炉NOx排放量超标的问题进行研究。采用CFD手段,对其进行结构优化设计;采用空气分级燃烧技术,预测NOx排放,得到了不同工况下的炉内温度及O2、CO和NOx等浓度分布。数值预测和试验结果都表明:在采用空气分级燃烧技术的情况下,增大二次空气量可以有效地减少NOx的生成排放,很好控制燃烧产物对大气的污染;在数值模拟中观察到随着二次空气量的增加,炉膛最高温度和平均温度降低,火焰或向一侧偏斜。该研究为空气分级低NOx燃烧系统改造效果的预报和应用提供重要参考依据。
Study on the issue of exceeding the standard of NOx emission of a heat medium furnace. CFD was used to optimize the structure of the system. Air staging combustion was used to predict the NOx emission. The furnace temperature, O2, CO and NOx concentration distribution under different operating conditions were obtained. Numerical prediction and experimental results show that in the case of air-staged combustion technology, increasing the secondary air volume can effectively reduce the NOx emission and control the pollution of the combustion products to the atmosphere. In the numerical simulation, With the increase of secondary air volume, the maximum temperature and the average temperature in the furnace are reduced, and the flame is deflected to one side. This study provides an important reference for the prediction and application of the revamping effect of air classification and low NOx combustion system.