不同阳极形式在区域阴极保护中的应用效果

Performances of different anodes in regional cathodic protection

在输油气站场工艺管道区域阴极保护系统中,阳极的形式和布局是决定系统设计成功与否的关键。为了研究不同阳极形式在区域阴极保护系统中的应用效果,结合区域阴极保护有效性评价结果,对比分析了不同阳极形式下输油气站场埋地工艺管道区域阴极保护的应用情况。分析表明:深井阳极和柔性阳极在实际应用中具有保护电流分布均匀,保护电位分布平衡程度高的特点,而分布式浅埋阳极则易出现保护电位分布差异较大的问题。结合深井阳极、柔性阳极和浅埋阳极的特点,对比分析了不同阳极形式的适用性和应用条件,提出了具体场合下的阳极形式选择原则,建议将数值模拟技术用于优化区域阴极保护设计,指导阳极的合理布局。

Forms and layouts of anodes are critical to successful design of regional cathodic protection system in process pipelines of oil/gas transmission stations. To clarify performances of different anodes in regional cathodic protection systems, with consideration to effectiveness of regional cathodic protection systems, application of anodes with different forms are analyzed for regional cathodic protection of underground process pipelines in oil/gas transmission stations. Research results show that deep-well anodes and flexible anodes deployed are characterized by even distribution of protective currents and balanced distribution of protective potentials, while distributive shallow-buried anodes are characterized by significant differences in distribution of protective potentials. With consideration to specific features of deep-well anodes, flexible anodes and shallow-buried anodes, principles for selection of suitable anodes for specific applications are highlighted after analysis on applicability and application conditions of different anodes. It is proposed to apply numerical simulation in optimization of the design for regional cathodic protection systems to ensure proper layout of anodes.