Abstract: Based on the BK10 physical property method and Peng-Robinson equation of state, a simulation model of volatile pipeline processes at the top of the atmospheric tower was constructed, and the distribution laws of oil-water two-phase and corrosive media at the top of the tower were analyzed. On this basis, the corrosion characteristics of corrosive media in pure water phase and oil-water two-phase on the top material of the atmospheric tower were compared and analyzed through experiments. The influence of different oil-water ratios and concentrations of corrosive media on the corrosion rate and surface morphology of the top material of the atmospheric tower was studied. The results show that the dew-point corrosion temperature of HCl at the top of the atmospheric tower is 99℃, mainly located in the first layer of the tower disc; according to the corrosion rate data obtained after the experiment for pure water phase and oil-containing phase, the dew-point corrosion is most severe in pure water phase. The presence of oil phase will reduce the dew-point corrosion rate at the top of the atmospheric tower, and the corrosion rate decreases more significantly with the increase of oil phase ratio in the fluid; an increase in HCl concentration will lead to an increase in the degree of corrosion.

Key words: atmospheric tower top system, oil-water two-phase, dew-point corrosion mechanism, dew-point temperature, oil-water ratio, water content, HCl content, corrosion rate

摘要： 基于BK10物性方法和Peng-Robinson状态方程，构建了常压塔塔顶挥发性管线工艺仿真模型，分析了塔顶油水两相及腐蚀性介质的分布规律。在此基础上，通过实验比较分析了纯水相和油水两相中腐蚀性介质对常压塔塔顶材料的腐蚀特性，研究了不同油水比例和腐蚀性介质浓度对常压塔塔顶材料腐蚀速率和表面形貌的影响规律。结果表明：常压塔塔顶HCl露点腐蚀温度为99℃，主要位于第一层塔盘；根据实验后得到的纯水相和含油相中腐蚀速率数据，纯水相中露点腐蚀最严重，油相的存在会降低常压塔塔顶露点腐蚀速率，且随着流体中油相比例增加腐蚀速率降低更加明显；HCl浓度增大会导致腐蚀程度增加。

关键词: 常压塔塔顶系统, 油水两相, 露点腐蚀机理, 露点温度, 油水比例, 含水量, HCl含量, 腐蚀速率