具有连续弯头管道的酸性天然气腐蚀分析  

Corrosion analysis of acidic natural gas with continuous elbow pipe

作　　者：曾维国[1] 杨冠华 李林涛 张正翔 Zeng Weiguo;Yang Guanghua;Li Lintao;Zhang Zhengxiang(China Special Equipment Testing And Research Institute,Beijing 100000;First Gas Production Plant of SINOPEC North China Company,Shanxi,Yulin 719000;The Fourth Gas Production Plant of PetroChina Changqing Oil Field Company,Shanxi,Xian710000)

机构地区：[1]中国特种设备检测研究院,北京100002 [2].中石化华北油气分公司第一采气厂,陕西榆林719000 [3]长庆油田分公司第四采气厂,陕西西安710000

出　　处：《石化技术》2020年第11期64-67,共4页Petrochemical Industry Technology

基　　金：天然气净化厂工业管道定期检验策略研究技术(K-19-D02)

摘　　要：管道内流体对弯头处的冲蚀,加剧了管道的腐蚀程度。本研究基于对某厂酸性天然气的输送管道的一处具有连续多弯头管线的管壁检测,分析了酸性天然气在连续多弯头管线各弯头出口位置的腐蚀减薄程度及分布。发现在流动方向的后续弯头对前置弯头处的流线有扰乱作用,导致酸性天然气对前置弯头出口处截面环向的腐蚀减薄分布区域向后续弯头出口流线方向移动,并且后续弯头受到流体的冲蚀强度随着弯头数的增大而明显降低。The fluid could corrode the pipeline,especially for the increased the erosion at the elbow of a pipeline.In this study,the wall thickness of the elbows for a continuous pipeline with multi-elbow,which was used for the transport of acidic natural gas,were detected by the technologies of high frequency guided waves,phased array and ultrasonic thickness measurement.According to the result of detection,we analyzed the degree and distribution of erosion around the cross section of the elbows for a continuous pipeline with multi-elbow.It suggested that there was a disturbance on the flow line of natural gas for the pre-elbow because of the follow-up elbow,following the direction of transport.This disturbance caused that the degree and distribution of erosion around the cross section of the pre-elbow had an obvious shift towards the directional change of transport due to the followup elbow.Additionally,the degree of erosion at the exit of follow-up elbow decreased obviously along with an increase of number of elbows.

关 键 词：酸性天然气 连续弯头 流场 冲蚀 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]