高压直流接地极电流对埋地金属管道的腐蚀干扰分析
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摘要
高压直流接地极与埋地金属管道邻近时,管道设施将面临腐蚀干扰风险,管道防腐层局部破损处为腐蚀干扰的薄弱区。基于矩量法,提出了一种考虑防腐层发生局部破损时金属管道受高压直流接地极入地电流腐蚀干扰影响程度的计算方法,结合典型案例进行分析,研究了破损点面积、位置以及数量对于腐蚀干扰的影响程度。结果表明:单独考虑破损面积影响时,破损点面积越小,破损处泄漏电流密度越大;破损点集中分布时,管道上可能出现单一的腐蚀问题或氢损伤问题;破损点均匀分布时,破损点数量对于泄漏电流分布的影响很小。
Buried pipelines will be threatened by corrosion interference as they are close to the HVDC electrode and the local damaged area of the anti-corrosive coating of the pipeline is the weak area prone to be corrosively interfered. On the basis of the method of moments(MoM), this paper proposes a method for calculating effect degree of corrosion interference of the HVDC electrode current on pipelines as the anti-corrosive coating is locally damaged. Combining with typical cases, it studies effect degrees of damaged area, location and amounts on corrosion interference. The results indicate that when only considering damaged area, the smaller the area is, the larger the leakage current density is. As damaged points are in centralized distribution, there may be problems of single corrosion or hydrogen damage in pipelines, while as damaged points are in uniform distribution, amounts of damages points have small effects on distribution of leakage current.
Buried pipelines will be threatened by corrosion interference as they are close to the HVDC electrode and the local damaged area of the anti-corrosive coating of the pipeline is the weak area prone to be corrosively interfered. On the basis of the method of moments(MoM), this paper proposes a method for calculating effect degree of corrosion interference of the HVDC electrode current on pipelines as the anti-corrosive coating is locally damaged. Combining with typical cases, it studies effect degrees of damaged area, location and amounts on corrosion interference. The results indicate that when only considering damaged area, the smaller the area is, the larger the leakage current density is. As damaged points are in centralized distribution, there may be problems of single corrosion or hydrogen damage in pipelines, while as damaged points are in uniform distribution, amounts of damages points have small effects on distribution of leakage current.
引文
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[13] 张其滨,刘金霞,赫连建峰,等.管道3PE涂层的阴极剥离性能研究[J].腐蚀与防护,2006,27(7):331-337.ZHANG Qibin,LIU Jinxia,HELIAN Jianfeng,et al.The cathodic disbonding performance of 3PE pipeline coating [J].Corrosion & Protection,2006,27(7):331-337.
[2] 罗宇航,李兴.云广特高压直流接地极母线差动保护状态识别信号的改进[J].广东电力,2017,30(3):122-127.LUO Yuhang,LI Xing.Improvement on differential protection recognition of the Yun-Guang line ±800 kV DC transmission project [J].Guangdong Electric Power,2017,30(3):122-127.
[3] 龚文强,徐亮,周科,等.直流换流站接地极对变压器中性点电流的影响[J].广东电力,2011,24(4):19-23.GONG Wenqiang,XU Liang,ZHOU Ke,et al.The influence of DC convertor station grounding electrode on transformer neutral point current[J].Guandong Electric Power,2011,24(4):19-23.
[4] 王雁冰.川气东送管道杂散电流排流工程技术研究[D].西安:西安石油大学,2010.
[5] 程明,张平.鱼龙岭接地极入地电流对西气东输二线埋地钢质管道的影响分析[J].天然气与石油,2010,28(5):22-26.CHENG Ming,ZHANG Ping.Effect of Yulongling grounding current on buried steel pipeline of west-east gas pipeline [J].Natural Gas and Oil,2010,28(5):22-26.
[6] 李振军.高压/特高压直流输电系统对埋地钢质管道干扰的现场测试与分析[J].腐蚀与防护,2017,38(2):142-146,150.LI Zhenjun.Field test and analysis of interference of high or ultra high voltage direct current transmission system to underground steel pipeline [J].Corrosion & Protection,2017,38(2):142-146,150.
[7] DL/T 5224—2005,高压直流输电大地返回运行系统设计技术规定[S].
[8] 李丹丹.高压直流输电线路对某埋地金属管道的干扰规律研究[D].成都:西南石油大学,2014.
[9] ZHANG B,CAO F,MENG X,et al.Numerical approach of impressed potential on buried pipelines near high-voltage DC grounding electrodes [J].IET Generation,Transmission & Distribution,2017,12(5):1177-1182.
[10] 白锋,郭剑,尹浩柳.特高压直流输电线路对输油输气管道的电磁影响仿真计算[C]//电工测试技术学会交流会论文集.北京:电工测试技术学会,2010:111-119.
[11] 郭生武.埋地钢质管道外防腐层的选择与应用[J].油气储运,2003,22(2):31-35.GUO Shengwu.Selection and application of external anticorrosion coating for buried steel pipeline [J].Oil & Gas Storage and Transportation,2003,22(2):31-35.
[12] 曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2004.
[13] 张其滨,刘金霞,赫连建峰,等.管道3PE涂层的阴极剥离性能研究[J].腐蚀与防护,2006,27(7):331-337.ZHANG Qibin,LIU Jinxia,HELIAN Jianfeng,et al.The cathodic disbonding performance of 3PE pipeline coating [J].Corrosion & Protection,2006,27(7):331-337.