Abstract: ombined with the case of corrosion leakage at the top wall of H₂S stripper in residue hydrogenation unit, the corrosion and defect treatment of stripper in residue hydrogenation unit are introduced. Based on the actual production data of the unit, the dew-point corrosion of the individual water phase is eliminated by calculating the dew-point temperature at the top of the stripper. Through follow-up analysis, it is found that the chlorine content of feedstock of the unit is high from August 2020 to March 2021, with an average value of more than 4 μg/g, and the chlorine content of sour water at the top of stripper is also high. Through calculation, the crystallization temperature of ammonium chloride at the top of stripper is 160~190 ℃, while the actual operating temperature of the trays on the 1st to the 6th floors of stripper top is 158~210 ℃. It is considered that ammonium chloride corrosion is the main cause of equipment corrosion and perforation, and the improvement measures such as strengthening the process corrosion prevention and upgrading the equipment materials at the top of the stripper are proposed.

Key words: residue hydrogenation unit, H₂S stripper, corrosion, ammonium chloride, crystallization temperature, design, manufacturing

摘要： 结合渣油加氢装置硫化氢汽提塔顶部塔壁腐蚀泄漏的案例，对渣油加氢装置汽提塔腐蚀情况和缺陷处理进行了介绍。以装置实际生产数据为依据，通过计算汽提塔塔顶露点温度，排除了单独水相的露点腐蚀。通过跟踪分析发现，2020年8月—2021年3月装置原料氯质量分数较高，平均值大于4 μg/g；汽提塔塔顶酸性水的氯含量也较高。通过计算得出塔顶氯化铵结晶温度在160～190 ℃，而装置汽提塔塔顶第1～6层塔盘的实际操作温度在158～210 ℃，认为氯化铵腐蚀是造成设备腐蚀穿孔的主要原因，提出了加强工艺防腐和汽提塔塔顶设备材质升级等改进措施。

关键词: 渣油加氢装置, 硫化氢汽提塔, 腐蚀, 氯化铵, 结晶温度, 设计, 制造