Over-vaporized oil in the vacuum tower
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This post was last edited by wood Leaves on 2022-3-25 12:21. How to control the superheated oil in the pressure relief tower?
In simple terms, it means that the outlet temperature of the vacuum furnace and the vaporization rate are set with an appropriate margin relative to the draw rate of the vacuum tower; this margin represents the amount of oil that is over-vaporized, that is, the amount of liquid phase that flows downward at the bottom of the section above the feed inlet of the vacuum tower.
Aren’t they just mid-stream reflux and bottom temperature?
The degree of vaporization is related to the yield of the vacuum distillation column, the feed temperature and composition to that column, as well as the amount of stripping steam. In short, at a constant vacuum level and with unchanged distillation yield, increasing the feed temperature or the amount of stripping steam raises the degree of vaporization, while decreasing these values lowers it； With constant vacuum level, feed temperature, and stripping steam, an increase in the vacuum distillation yield leads to a decrease in the vaporization rate, and vice versa.