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

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