What causes a sudden rise in the temperature at the top of the vacuum tower at startup? How to deal with it?
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What causes a sudden rise in the temperature at the top of the vacuum tower at startup? How to deal with it?
For tower flushing, it is recommended to use top circulation; for Level 1 and Level 2, more backflow should be generated
The light components are not fully removed or dehydrated; what was said on the second floor is correct. Another reason is that the vacuuming process was carried out too quickly. At this point, the outlet temperature of the vacuum furnace should be reduced, while the outlet temperature of the atmospheric furnace and the extraction from the atmospheric side stream should be increased. The extraction from the top of the furnace should also be enhanced; if necessary, the vacuum system can be turned off
It is still very necessary to have diesel ready for reducing the pressure at the top of the column at the start of operation; if normal operation at atmospheric pressure is not achieved, switching to reduced-pressure mode, too rapid vacuum creation during pressure reduction, or issues in establishing the appropriate pressure levels in various sections of the column can all lead to excessively high temperatures at the top of the column.
Before reducing pressure and evacuating, the reflux should have already been established, right? Or maybe you tried to create a vacuum too quickly before the backflow had stabilized; the speed was too fast