CFD技术在大型化裂解炉返炉膛配管研究中的应用

APPLICATION OF CFD TECHNOLOGY IN THE RESEARCH ON PIPING LAYOUT FOR RECYCLING DECOKING EFFLUENT TO FIREBOX OF LARGE-SCALE CRACKING FURNACE

返炉膛烧焦是降低裂解炉污染物排放的有效措施之一,返炉膛配管布置对返炉膛烧焦效果有很大影响。文章应用CFD技术对返炉膛配管布置进行数值模拟。计算采用RNG k-ε湍流模型进行模拟,采用壁面函数Standard Wall Fn对近壁面流动修正。计算结果表明:合理的返炉膛配管布置可使烧焦气均匀进入炉膛,不会对正常的操作产生影响。基于CFD技术的模拟计算能够较为准确的预测返炉膛烧焦气在管道内的流动情况,为裂解炉大型化下的返炉膛配管布置提供了技术参考。

Recycling decoking effluent to firebox of cracking furnace is one of the effective measures to reduce pollutant emissions from the cracking furnace,and the piping layout for recycling decoking effluent to firebox has a significant impact on the decoking effect.This article uses CFD technology to numerically simulate the piping layout for recycling decoking effluent to firebox.RNG k-ε turbulence model is used for the simulation,and the wall function Standard Wall Fn is used to correct the near wall flow.The calculation results indicate that a reasonable piping layout can ensure the even entry of decoking effluent into the firebox without affecting the normal operation.The simulation calculation based on CFD technology can accurately predict the flow of decoking effluent in pipelines,providing technical reference for the piping layout for recycling decoking effluent to firebox of large-scale cracking furnace.