集气管线带焊缝90°弯头的冲刷腐蚀
Erosion Corrosion of 90° Elbow Containing Welds in Gas Gathering Pipelines
摘 要
对国内某气田集气管线带有焊缝的失效弯头进行了分析,利用Fluent软件模拟了焊缝与90°弯头处流体流型流态,分析了集气管线在该处的冲刷腐蚀机理。结果表明:焊缝和弯头外弧侧内壁处具有较高的漩涡强度,使该处腐蚀产物从金属表面剥离;受近壁面较高湍流强度的流体影响,剥离的腐蚀产物快速向主流体运移,裸露的金属基体继续被腐蚀,最终使焊缝和弯头外弧侧内壁发生严重的冲刷腐蚀。两端具有焊缝的天然气集输管线弯头,在焊缝、外弧侧内壁的冲刷腐蚀速率较高,在无内防护的服役过程中易发生腐蚀穿孔。
弯头
焊缝
冲刷腐蚀
gas gathering pipeline
elbow
weld
erosion corrosion
Abstract
A failure elbow containing welds in a gas gathering pipeline was analyzed. The mechanism of erosion corrosion of gas gathering pipelines at 90° elbow and weld was analyzed through simulation of fluid flow patterns at these positions in pipeline by Fluent software. The results showed that the corrosion products were peeled off from the metal surface of the weld and the inner wall of outer arc side of the elbow because of higher vortex intensity. The stripped corrosion products quickly moved to main flow under the influence of fluid with high turbulence intensity near the wall. The exposed metal matrix continued to be corroded, and finally serious erosion corrosion occurred in the weld and the inner wall on the outer arc side of the elbow. The elbow with welds at both ends in natural gas gathering and transportation pipeline had a high erosion corrosion rate in the weld and the inner wall on outer arc side, and it was prone to corrosion perforation in the service process without internal protection.
中图分类号 TG174 DOI 10.11973/fsyfh-202311013
所属栏目 数值模拟
基金项目
收稿日期 2023/8/16
修改稿日期
网络出版日期
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引用该论文: FENG Siqiao. Erosion Corrosion of 90° Elbow Containing Welds in Gas Gathering Pipelines[J]. Corrosion & Protection, 2023, 44(11): 72
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参考文献
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【3】MAZHAR H,EWING D,COTTON J S,et al.Experimental investigation of mass transfer in 90° pipe bends using a dissolvable wall technique[J].International Journal of Heat and Mass Transfer,2013,65:280-288.
【4】TAKANO T,IKARASHI Y,UCHIYAMA K,et al.Influence of swirling flow on mass and momentum transfer downstream of a pipe with elbow and orifice[J].International Journal of Heat and Mass Transfer,2016,92:394-402.
【5】SHAN F,LIU Z C,LIU W,et al.On flow structures associated with large wall mass transfer coefficients in orifice flows[J].International Journal of Heat and Mass Transfer,2016,102:1-9.
【6】杨湘愚, 关蕾,李雨,等.基于正交试验的90°弯管冲刷腐蚀数值模拟及实验研究[J].中国腐蚀与防护学报,2022,42(6):979-987.
【7】黄辉, 马红莲,何仁洋,等.某天然气站场管道典型管件内腐蚀原因分析[J].理化检验(物理分册),2015,51(9):653-656.
【8】周霄骋, 刘智勇,邢云颖.含CO2-H2S酸性气田冲刷腐蚀概述[J].中国特种设备安全,2016,32(8):1-5.
【9】FERREIRA L R M,PONTE H A,SANCHES L S,et al.CO2 corrosion in the region between the static and turbulent flow regimes[J].Materials Research,2015,18(2):245-249.
【10】WHARTON J A,WOOD R J K.Influence of flow conditions on the corrosion of AISI 304L stainless steel[J].Wear,2004,256(5):525-536.
【11】LI W,POTS B F M,BROWN B,et al.A direct measurement of wall shear stress in multiphase flow-is it an important parameter in CO2 corrosion of carbon steel pipelines?[J].Corrosion Science,2016,110:35-45.
【12】BAKKER A,OSHINOWO L M.Modelling of turbulence in stirred vessels using large eddy simulation[J].Chemical Engineering Research and Design,2004,82(9):1169-1178.
【13】THORSEN M J,SÆVIK S,LARSEN C M.Fatigue damage from time domain simulation of combined in-line and cross-flow vortex-induced vibrations[J].Marine Structures,2015,41:200-222.
【14】LEE Y S,LEE S H,HWANG K M.Cause analysis of flow accelerated corrosion and erosion-corrosion cases in Korea nuclear power plants[J].Corrosion Science and Technology,2016,15(4):182-188.
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