Abstract: In view of the high temperature of the furnace tube wall of some furnace tubes in the reaction feedstock heating furnace of the CCR unit in an enterprise, the heating furnace and burner are modeled and reduced by numerical simulation method, and the simulated furnace flue gas velocity field, temperature field and furnace tube surface temperature distribution are analyzed qualitatively and quantitatively. It is found that the maximum temperature of furnace tube wall is very close to the ultimate design metal temperature of furnace tube material. Various factors affecting the burner flame are studied. Combined with the upgrading and transform of the flue gas waste heat system of the heating furnace, the optimization and transformation direction is defined, and the adjustment scheme of the burner structure parameters is optimized. The temperature field distribution of the reformed furnace is uniform, which realizes the homogenization of furnace tube wall temperature. At the same time, the furnace temperature is 15~25 ℃ lower than that before the transformation, the maximum temperature of furnace tube wall is reduced by about 20 ℃, and the emission concentration of NOx is effectively controlled.

Key words: CCR unit, furnace, heating furnace, temperature field, numerical simulation, burner construction, qualitative analysis, quantitative analysis

摘要： 针对某企业连续重整装置反应进料加热炉部分炉管管壁温度较高的问题，采用数值模拟方法对加热炉和燃烧器建模并还原计算，对模拟计算出的炉膛烟气速度场、温度场及炉管表面温度分布进行定性和定量分析，发现炉管管壁最高温度已非常接近炉管材料的极限设计金属温度。研究了影响燃烧器火焰的各种因素，结合加热炉烟气余热系统的升级改造，明确了优化改造方向，优选出了燃烧器结构参数调整方案。改造后的炉膛温度场分布均匀，实现了炉管管壁温度均匀化，同时炉膛温度较改造前降低了15~25 ℃，炉管管壁最高温度降低了20 ℃ 左右，NOx排放浓度得到了有效控制。

关键词: 连续重整装置, 加热炉, 温度场, 数值模拟, 燃烧器结构, 定性分析, 定量分析