石油学报 ›› 2013, Vol. 34 ›› Issue (2): 393-400.DOI: 10.7623/syxb201302025

• 石油工程 • 上一篇    下一篇

油气输送站场内外阴极保护系统间干扰数值模拟

董 亮 1  杜艳霞 1  路民旭 1  姜子涛 1  贺哲丰 1  陈鹏羽 2   

  1. 1. 北京科技大学新材料技术研究院 北京 100083; 2. 中国石油大学石油工程学院 北京 102249
  • 收稿日期:2012-08-14 修回日期:2012-11-25 出版日期:2013-03-25 发布日期:2013-01-31
  • 通讯作者: 杜艳霞,女,1980年1月生,2007年获中国石油大学(华东)油气储运工程专业博士学位,现为北京科技大学讲师,主要从事金属材料的腐蚀与防护研究。
  • 作者简介:董亮,男,1984年11月生,2007年获北京科技大学材料科学与工程专业学士学位,现为北京科技大学博士研究生,主要从事金属材料的腐蚀与防护研究。Email:keen.dl@gmail.com
  • 基金资助:

    国家自然科学基金项目(No.51101015)和中央高校基本科研业务费专项资金项目(FRF-TP-12-145A)资助。

Numerical simulation of interference between cathodic protection systems inside and outside oil/gas stations

DONG Liang 1  DU Yanxia 1  LU Minxu 1  JIANG Zitao 1  HE Zhefeng 1  CHEN Pengyu 2   

  • Received:2012-08-14 Revised:2012-11-25 Online:2013-03-25 Published:2013-01-31

摘要:

为了研究油气输送站场内、外阴极保护系统间的干扰问题,通过分析系统间干扰与单一阴极保护系统在数学模型和数值处理方法上的差异,采用数值模拟技术对站场内、外阴极保护系统间的干扰进行了研究,并利用室内模拟实验对干扰数学模型和计算方法进行了验证,同时根据实际案例计算分析了系统干扰程度的影响因素和影响规律。数值模拟结果表明:站内阴、阳极电场的叠加电场强度决定了站外管线所受的干扰程度及规律;由于站内阴极保护系统阳极地床类型及设置位置不同,叠加电场的强弱也不同,干扰程度的差异较大;随着站内阴极保护系统输出电流和土壤电阻率增大,叠加电场强度增加,干扰程度增大;站外管道干线的电位控制点应设置在距干扰侧一定距离之外,以避免站外阴极保护系统输出电流产生较大波动。

关键词: 油气站场, 阴极保护, 干扰;数值模拟, 影响因素

Abstract:

An interference problem could be induced due to the difference between two cathcdic prctection(CP) systems currently applied inside and outside oil/gas stations This interference problem was studied with numerical simulation technology by analyzing differences of interference between systems and of a single CP system in processing approaches by mathematical models and numerical simulation methods. Both the mathematical model and the numerical simulation method dealing with interference problems were validated experimentally and then used to analysis influential factors of system interference degrees in the case calculation. The results showed that the degree of interference to pipelines outside an oil/gas station is determined by the electric field intensity superimposed by cathode and anode electric fields inside an oil/gas station. Therefore, different interference degrees are dependent on different types and locations of anode beds in the CP system inside the oil/gas station, and the interference degree increases with increasing the output current of the CP system and soil resistivity inside the oil/gas station, thus, the stronger the intensity of a superimposed electric field, the more the interference degree increases. In addition, the potential control point should be set in a reasonable distance from a station in order to avoid producing larger fluctuation by the output current of the outside CP system.

Key words: oil/gas station,  , cathodic protection,  , interference,  , numerical simulation,  , influential factor