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通过排查干燥系统设备泄漏情况、提高减压干燥塔进料温度,并结合上游装置生产变化、硫化氢汽提塔运行工况,判断出进装置新氢纯度突降,导致循环氢纯度短期内大幅降低,汽提塔进料、汽提塔底油携带的不凝气相应增多,不凝气在减压干燥系统中聚集,致使系统负压上升,真空度下降。通过运行抽真空系统,将减压干燥系统中不凝气外排至装置低压火炬系统,减压干燥系统运行状况恢复正常,系统真空度下降的问题得以解决。
By investigating the leakage of equipment in the drying system and increasing the feed temperature of the desiccant drying tower, in combination with the upstream plant production changes and the operation conditions of the hydrogen sulfide stripper, the purity of the new hydrogen into the plant is suddenly reduced, Reduce the feed of the stripper and the non-condensable gas carried by the bottom oil of the stripper increases correspondingly, and the non-condensable gas accumulates in the vacuum drying system, causing the negative pressure of the system to rise and the vacuum to drop. Through the operation of the vacuum system, the non-condensable gas in the vacuum drying system is discharged to the low-pressure flare system of the device, the operating conditions of the vacuum drying system are restored to normal, and the problem of the system vacuum reduction is solved.