阿尔及利亚某炼化工程一台凝析油/重柴油换热器抽芯检查过程中发现换热管束有明显冲刷腐蚀. 发生腐蚀的部位正对重柴油入口, 该处管束顶部有密集分布的冲蚀坑及麻点, 底部蚀坑表面有油污及腐蚀产物附着. 通过金相和扫描电镜观察、能谱分析及双环电化学动电位再活化等多种方法分析了冲刷腐蚀的成因和热处理对TP405管束材料耐晶间腐蚀性能的影响, 对换热器壳程入口冲刷腐蚀预防措施和整改方案提出建议.
After a rutine inspection for a failured condensate/heavy diesel oil heat exchanger in a refinery in Algeria, it followed that the tube bundle of that set was suffered from serious erosion corrosion. The erosion occurred at the location opposite to the heavy diesel oil inlet. On the top surface of the tubes corrosion spots were observed, while corrosion products attached on the bottom surface of these tubes. Metallography, scanning electron microscope (SEM), energy dispersive spectrum (EDS) and electrochemistry tests were conducted to investigate the reason of this erosion corrosion, as well as the effect of heat treatment on the erosion resistance of TP405 tube bundle. Then solutions for this corrosion were proposed to avoid such kind of damage in the future.
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