论文部分内容阅读
为了研究长输管道阴极保护管中电流的分布规律,采用数值模拟技术对3PE和石油沥青两种不同类型防腐层在不同阴极保护站间距下的管道阴极保护参数进行计算。根据计算结果分析了管道沿线的电流密度、管中电流及其产生的管道内阻电压降之间的关系和分布规律,进而对管道断电电位及其IR降进行探讨。结果表明:防腐层绝缘性能参数与管道阴极保护站间距参数相匹配时,可以实现近似均匀的保护效果,即管道沿线电位衰减很小、电流密度近似均匀散流到管道上;管中电流形成的管道内阻电压降是管地电位测量结果和断电电位测量中IR降的一部分,使用断电法评价防腐层绝缘性能时应远离管道通电点。(图2,参10)
In order to study the distribution of current in cathodic protection pipes of long-distance pipeline, the numerical simulation technology was used to calculate the cathodic protection parameters of two different types of coatings of 3PE and petroleum asphalt at different cathodic protection stations. According to the calculation results, the relationship between the current density along the pipeline, the current in the pipeline and the internal resistance drop caused by the pipeline is analyzed, and then the potential of the pipeline and the IR drop are discussed. The results show that when the insulation performance parameters of the coating are matched with the parameters of the cathodic protection station spacing, the protective effect can be approximately uniform. That is, the potential attenuation along the pipeline is very small, and the current density is approximately evenly distributed to the pipeline. The internal resistance voltage drop of the pipe is a part of the IR drop of the pipe ground potential measurement and the power-off potential measurement. When using the power-off method to evaluate the insulation performance of the coating, it should be far away from the pipeline energization point. (Figure 2, reference 10)