| 摘要: |
| 站场埋地管网众多,干扰和屏蔽现象严重;庞大接地网的存在使阴极保护电流流失严重。针对这些问题,建立埋地管道阴极保护电位分布的数学模型,并采用边界元算法进行离散。设计实验,测试埋地管道阴极极化曲线,并采用分段线性法进行处理。采用基于边界元法的大型数值模拟软件BEASY对某一区域站场进行阴极保护设计,考虑了3种阴极保护方式:牺牲阳极阴极保护、外加电流阴极保护、牺牲阳极和外加电流联合阴极保护。研究结果表明:边界元算法是解决埋地管道阴极保护问题的有效工具。采用牺牲阳极和外加电流联合阴极保护可以有效地解决2个问题;采用牺牲阳极保护所需阳极数量太多,工程上难以实施;采用外加电流阴极保护使得整个埋地管网电位分布不均匀。 |
| 关键词: 区域阴极保护 边界元 BEASY 牺牲阳极保护 外加电流阴极保护 |
| DOI：10.3969/j.issn.1673-5005.2014.06.024 |
| 分类号::TE 988 |
| 基金项目:国家科技重大专项(2008ZX05017-04-01) |
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| Cathodic protection design of station area based on boundary element method |
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CUI Gan1, LI Zili1, WEI Xu2, BAI Xue1
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(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.Oil and Gas Control Center in Beijing, Beijing 100007, China)
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| Abstract: |
| In oil or gas stations there can be situations where many underground pipelines are present in reasonably close proximity. This can lead to serious interference and shielding phenomena, and there are many grounding networks that can cause substantial loss of the cathodic protection current. The mathematical model of the buried pipeline cathodic protection potential distribution was established and the boundary element method was used for discretization of the equations. Then experiment was designed, the buried pipeline cathodic polarization curve was tested, and the piecewise linear method was used for processing. The numerical simulation software based on boundary element method BEASY was used for the design of cathodic protection for a station. Three kinds of cathodic protection methods are considered, which are sacrificial anode cathodic protection, impressed current cathodic protection, and combination of sacrificial anode and impressed current joint cathodic protection. The results show that the boundary element method is an effective tool to solve the problems in buried pipeline cathodic protection. The combination of sacrificial anode and impressed current joint cathodic protection can solve two problems effectively. The number of anodes needed for sacrificial anode protection is great and this technology is difficult to implement in engineering practice. For impressed current cathodic protection, the distribution of the whole buried pipeline potential is not uniform. |
| Key words: regional cathodic protection boundary element BEASY sacrificial anode protection impressed current cathodic protection |
