基于缩比模型的导管架平台外加电流阴极保护系统优化设计

目的研究远地式辅助阳极发生电流单元的改变和距离平台的相对位置对平台电位分布及保护程度的影响。方法以位于渤海湾JZ120-1在役导管架平台为原型,构建了一个1∶20的缩比模型。在平台底部一定距离处放置一座远地式辅助阳极,研究恒电流下辅助阳极与平台底部间距和辅助阳极发生电流单元的改变对平台电位分布及其保护程度的影响。结果单座远地阳极即可实现对整座平台的腐蚀控制。辅助阳极距离平台越远,平台表面电位差越小,电位分布越均匀;辅助阳极距离平台越近,单支阳极较四支阳极保护下的平台表面电位差越大,距离越远,电位差越小,距离相同时,4支阳极较单支阳极保护下的平台表面电位差小,电位分布更均匀。尽管海水稀释20倍,钙质沉积层的沉积与覆盖仍是影响平台表面电位分布的重要因素。结论辅助阳极发生电流单元的数量、距离平台的相对位置以及钙质沉积层的覆盖是影响平台表面电位分布和保护程度的重要因素。

Design Optimization of ICCP System for Jacket Platform Based on Physical Scale Model

Objective To Study the effects of the change in current unit of the remote auxiliary anode and the spacing between the platform and the auxiliary anode on the distribution and protection of platform potential. Methods Based on the JZ120-1 jacket platform in the Bohai Bay, a 1 : 20 physical scale model was built. At the bottom of the experimental pool, a remote auxiliary anode was placed at a certain distance apart from the scale model. Under a certain protection current, the effects of the spacing between the platform and the auxiliary anode as well as the change in current unit of the remote auxiliary anode on the distribution and protection of platform potential were studied. Results The corrosion control of the whole platform can be realized by a single-seat remote anode. The farther the distance between the auxiliary anode and the scale model, the smaller the platform surface potential diffference, and the more even the potential distribution. The closer the distance between the auxiliary anode and the scale model, the greater the potential difference between one anode unit and four anode units, while the farther the distance, the smaller the potential difference. Comparing with the one unit, the four anode units showed a smaller platform surface potential difference and a more even potential distribution at the same distance. Although the experimental seawater was diluted 20 times by running water, the calcareous sediments and covering were still important factors affecting the potential distribution on the platform surface. Conclusion The current unit amount of the auxiliary anode, the spacing of the platform and the auxiliary anode, and the covering of calcareous sediments were important factors affecting the distribution and protection of the platform surface potential.