关键词: 反应流出物, 高压, 空气冷却器, 腐蚀系数

Abstract: At the 2 Mt/a hydrocracking unit of SINOPEC Yansan Company, the leakage of screws on pipes of the high-pressure air cooler once happened during the startup period, which implied a hidden trouble in the later operation. Thus, anti-corrosion analysis was carried out including material selection, piping design, the injections of water and inhibitor, and the corrosion mechanism of high-pressure air-coolers was discussed as well. The optimum operation conditions were proposed and monitoring the corrosion coefficient Kp, the concentration of ammonium hydrosulfide in wastewater and the gas rate of reaction effluent was conducted. Since then by optimizing the feedstock components and adjusting the desulfurization of recycle hydrogen in time, the corrosion coefficient Kp was always kept less than 0.07 to ensure a long-term operation.

Key words: reaction effluent, high-pressure, air cooler, coefficient of corrosion