渣油加氢脱硫反应进料加热炉炉型优化

Optimization of feed heater of vacuum residue hydrodesulfurization reactor

介绍渣油加氢脱硫反应进料加热炉的设计特点。通过区域法模拟,对渣油加氢脱硫反应进料加热炉传热的影响因素进行了分析,结果表明:1燃烧器至排管间距越大,排管的辐射平均热强度越均匀,建议此类加热炉该间距宜超过1.1 m,可以明显提高加热炉的辐射传热均匀性;2燃烧器火焰高度越高,加热炉炉膛烟气温度场分布越均匀,建议此类加热炉的燃烧器火焰高度宜超过炉膛高度的30%,可以明显提高加热炉的辐射传热均匀性;3油品流向由逆流传热调整为顺流传热能降低加热炉的管壁峰值温度及最高油膜温度,提高加热炉在苛刻工况下的适应能力。

The engineering design characteristics of feed heater of Vacuum Residue Hydrodesulfurization （VRDS） reactor are described. The impact factors for heat transfer of feed heater of Vacuum Residue Hydro-desulfurization reactor are analyzed by hot zoning simulation method. The study results demonstrate that：① when the space between burner and coil is longer, the average heat radiation flux is more uniform. It is suggested the space between tubes should exceed 1.1 m, which can obviously improve uniformity of heat radiation flux of heater; ②When the burner flame height is higher, the distribution of temperature field inside heater chamber is more uniform. The recommended height should be greater than 30% of the height of chamber, which can significantly improve the uniformity of furnace radiation heat transfer; ③The adjustment of oil flow direction （adjustment of countercurrent heat transfer for co-current heat transfer） can reduce the peak tube wall temperature and the maximum internal film temperature, which can improve the furnace ability to adapt to the harsh operating conditions.