Reasons for negative pressure in the flash tower
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The bottom material from a high-pressure tower enters a flash tower, and the top of this flash tower is connected to a positive-pressure system; then why does a negative pressure condition occur in the flash tower?
I have seen similar situations where the liquid phase at the lower part of the flash tower has a large height difference to the equipment downstream, creating a suction effect.
The height difference shouldn’t be very large (seven or eight meters). Could it be that changes in the feed volume to the previous high-pressure tower are affecting the evaporation rate in the flash tower? Is a negative pressure created by the after-cooling of the vapor at the top of the flash tower?
After flash evaporation, there is only one water cooler; after cooling by water, it connects to a system with not very high positive pressure!
Is there a liquid seal behind the cooler? Material feeding structure for the storage tank.
The vapor from the flash evaporation passes through a water cooler before flowing into a tank; since the solvent is relatively hazardous, nitrogen is used for protection
Is there condensation at the top of the tower? A good condenser works pretty much like a vacuum pump~
What would happen if there is a liquid seal?
@Engineering geek, please help provide a detailed explanation