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

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