Design of Deep-cut Vacuum Distillation Technique in Atmospheric and Vacuum Distillation Unit

On the basis of current status and research trend of deep-cut vacuum distillation in atmospheric and vacuum unit, combined with design experience of an 8.0Mt/a atmospheric and vacuum distillation unit, the ways to achieve deep-cut vacuum distillation were analyzed, these technology include high temperature of vacuum furnace outlet, anti-coking technology in vacuum furnace, high vacuum degree at vacuum tower top and low pressure drop of the whole tower, steam stripping operated in micro-wet conditions, anti-coking technology in vacuum tower bottom. The influence of setting an over-vaporization oil pipeline for deep-cut vacuum distillation was discussed emphatically.