全面腐蚀控制第37卷第10期2023年10月17专论Monograph技术静态直流杂散电流对埋地金属管道干扰规律数值模拟田海州1郭小东1黎少飞1杨鑫1林海峰1祁贵宏1刘天慧2(1.国家管网集团西南管道有限责任公司天水输油气分公司,甘肃天水741002;2.国家管网集团油气调控中心,北京100013)摘要:静态直流杂散电流会对埋地金属管道造成严重干扰腐蚀。为了研究管道外加电流阴极保护系统产生的杂散电流对管道的干扰影响,使用仿真软件COMSOLMultiphysics基于边界元法建立了由阴极保护管道、干扰管道和辅助阳极组成的干扰模型,研究了两条管道的交叉角、阳极与交叉点距离、土壤电导率及防腐涂层厚度对干扰管道上的杂散电流干扰影响规律。结果表明:当阳极与交叉点距离小于6km时,干扰管道受杂散电流干扰最为严重;当交叉角小于45°(在15~90°范围)、土壤电导率小于0.01S/m及防腐涂层厚度小于3mm时,干扰管道的杂散电流干扰显著增高,并针对各因素干扰工况下提出合理建议。研究结果可以为管道保护运行和干扰防护提供理论依据与实际参考。关键词:静态直流杂散电流阴极保护金属管道数值模拟干扰防护中图分类号:TE172.84文献标识码:ADOI:10.13726/j.cnki.11-2706/tq.2023.10.017.06NumericalSimulationofInterferenceLawofStaticDCStrayCurrentonBuriedMetalPipelineTIANHai-zhou1,GUOXiao-dong1,LIShao-fei1,YANGXin1,LINHai-feng1,QIGui-hong1,LIUTian-hui2(1.TianshuiSub-CompanyofSouth-WestPipelineCo.,Ltd.PipeChinaCorporationTianshui741002,China;2.Oil&GasPipelineControlCenter.PipeChina.Beijing100013,China.)Abstract:StaticDCstraycurrentcancauseseriousinterferenceandcorrosiontoburiedmetalpipelines.Inordertostudytheinterferenceeffectofstraycurrentgeneratedbypipelineimpressedcurrentcathodicprotectionsystemonpipeline,thesimulationsoftwareCOMSOLMultiphysicswasusedtoestablishaninterferencemodelconsistingofcathodicprotectionpipeline,interferencepipelineandauxiliaryanodebasedonboundaryelementmethod.Theresultsshowthatwhenthedistancebetweentheanodeandtheintersectionislessthan6km,theinterferencepipelineismostseverelyaffectedbystraycurrentinterference;Whentheintersectionangleislessthan45°(withintherangeof15~90°),thesoilconductivityislessthan0.01S/m,andthethicknessoftheanti-corrosioncoatin...