摘要
针对某炼厂350万吨/年常减压蒸馏装置减压转油线存在的局部腐蚀严重和压降高等问题,研究采用PipePhase管网计算与CFD流场模拟技术,结合流型分析,提出综合改造方案。通过升级管线材质至TP316L不锈钢、优化转油线空间走向(采用5D大曲率半径弯头并减少弯头数量)、调整分支汇入方式为顶部30°顺流斜插、以及在关键交汇点增加垫板等措施,显著降低了冲蚀风险。改造后,在相同原料、处理量及拔出率条件下,转油线平均腐蚀速率由0.8 mm/a降至0.2 mm/a,压降由19.7 kPa降至17.2 kPa,有效缓解了环烷酸腐蚀与气液两相流冲蚀问题。结果表明,结构优化结合数值模拟技术可显著提升装置安全性与经济效益,为同类装置改造提供了可复用的技术路线。
Aiming at severe localized erosion and high pressure drop issues in the vacuum oil transfer line of a 3.5 million tons/year atmospheric and vacuum distillation unit at a refinery,this study proposes an integrated retrofitting plan by combining PipePhase pipeline calculations,CFD flow field simulation,and flow regime analysis.The measures include upgrading pipeline material to TP316L stainless steel,optimizing the spatial layout of the transfer line(using 5D large-radius elbows and reducing the number of elbows),adjusting the branch connection method to a 30°top upstream inclined insertion,and adding stiffener plates at critical junctions.These improvements significantly reduced erosion risks.Post-retrofit results showed that under identical feedstock,throughput,and draw-off rate conditions,the average corrosion rate decreased from 0.8 mm/a to 0.2 mm/a,and the pressure drop dropped from 19.7 kPa to 17.2 kPa.This effectively mitigated naphthenic acid corrosion and two-phase flow erosion.The study demonstrates that structural optimization combined with numerical simulation technology can enhance both safety and economic efficiency,providing a reusable technical route for similar unit retrofits.
作者
宋长清
刘洋
Song Changqing;Liu Yang(China Kunlun Engineering Co.,Ltd.,Dalian Branch,Dalian,Liaoning 116085,China)
出处
《化工设备与管道》
北大核心
2025年第5期109-113,共5页
Process Equipment & Piping
关键词
减压转油线
冲蚀
环烷酸腐蚀
两相流模拟
结构优化
vacuum transfer lines
erosion corrosion
naphthenic acid corrosion
two-phase flow simulation
structural optimization
