High-temperature high-vacuum tower – vacuum anomaly
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Recently, the vacuum level couldn’t be increased when starting the 2 towers; what could be the reason? 1, Tower 1, operating pressure -90kpa ； Top temperature: 162°C±5 ； Bottom temperature of tower: 210°C ±5 ； The vacuum is often reduced to -80 kPa ； I have checked the system’s airtightness and for any blockages, and everything seems fine. What could be the other possible causes? (Vacuum equipment, water ring vacuum pump, working fluid, phenol) 2, Tower 2, operating pressure –88 kPa ； Top temperature: 200°C ±5 ； Bottom temperature of tower: 230°C ±5 ； The vacuum is often reduced to -70~80 kPa ； I have checked the system’s airtightness and there are no issues. What could be the other causes? (Vacuum equipment, steam ejector + water ring vacuum pump) (Medium in the tower, Medium 1, melting point 102℃ ； Boiling point 245℃ ； Medium 2, melting point 172℃ ； Boiling point 285°C)
The DCS interface pressure over time graph is displayed; by observing the pressure fluctuations, it becomes easier to analyze.
Using phenol as the working fluid for the liquid ring pump, what is the stable operating temperature of the liquid ring pump?
There are many areas where problems can be found. First is the operation of the vacuum equipment; second are the physical properties of the substances in the tower – whether they are thermally stable and whether any gases have dissolved in them; third, is the tower equipped with packing or trays? Are all other operating conditions stable?
A few days ago, I was working on a project involving two-column continuous distillation for solvent recovery, and encountered similar issues during the commissioning phase
Also, is there anything wrong with the atmospheric leg of your condensate reflux tank?
60°C, saturated vapor pressure 0.65kpa
None of them; the conditions are relatively stable. When they fail to meet the standards, the materials end up circulating back and forth, staying in the system for too long.
Is the fresh feed component stable?
Are you testing the vehicle or driving it after maintenance? If it’s a startup after maintenance, the problem should be easy to find – check your online instruments carefully. Since the two towers don’t share a vacuum system yet, and yet the same problem is occurring, check whether there’s an issue with your materials or with the measures in place to prevent them from solidifying. . .