高含硫天然气净化主吸收塔需要定期堆焊修复腐蚀部位，修复前后各需采用内燃法整体热处理技术进行消氢、消应处理。旋流器布置对空气分布及热处理过程中火焰调控具有重要影响，本工作分别对双级旋流器、单级旋流器I和II在吸收塔内的流动特性进行了模拟。结果表明，双级旋流器上方未产生明显回流区且速度分布均匀，内外两侧旋流叶片上方均产生较大的切向速度，空气入口速度为9.8 m/s的工况下产生的最大切向速度为8.33 m/s，其次为单级旋流器II的4.5 m/s和单级旋流器I的3.12 m/s。双级旋流器对应的塔内压降变化最小，证明其可有效产生低阻旋流场，且对应的塔底流线占比随气体质量流量变化可保持平稳，约为14%，与塔底壁面占塔体总表面积的百分比一致，能保证足够的气体介质回流塔底，促进气体对流。双级旋流器对应的90%塔内停留时间随气体质量流量增大而线性增长。总体上，双级旋流器的旋流效果优于其他两种旋流器，本研究可为内燃法整体热处理工艺旋流装置的优化设计提供参考。

The main absorption tower of natural gas with high hydrogen sulfur content purification needs regular welding repair due to corrosion. Before and after repair, the internal combustion integral heat treatment technology can be used to perform hydrogen-eliminating treatment and eliminate stress. The arrangement of swirlers has an important impact on air distribution and flame control during the heat treatment. In this work, the fluid field characteristics of two-stage swirler, single-stage swirler I and II in the absorption tower are simulated, respectively. The results show that there is no obvious recirculation zone above the two-stage swirler and the velocity distribution is uniform. A large tangential velocity is generated above the inner and outer swirler blades. The maximum tangential velocity is 8.33 m/s when the inlet velocity is 9.8 m/s, followed by single-stage swirler II and single-stage swirler I, 4.5 m/s and 3.12 m/s, respectively. The pressure drop in the tower corresponding to the two-stage swirler has the smallest change. These prove that the two-stage swirler can effectively generate low resistance swirling flow field. The proportion of the streamline at the bottom of the tower corresponding to the two-stage swirler changes steadily with the gas mass flow rate, and is kept at about 14%, which is consistent with the percentage of the tower bottom wall in the total surface area of the tower body. It can ensure that enough gas media return to the tower bottom and promote gas convection. The 90% residence time of two-stage swirler increases linearly with the increase of gas mass flow rate. In general, the swirling effect of the two-stage swirler is better than that of the other two swirlers, and this study provides a reference for the optimization design of swirl device of internal combustion integral heat treatment process.