The heavy components at the top of the degassing tower are above the specified limit, and the light components at the bottom of the tower are also above the limit. What should be done?
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The reconstituted components at the top of the tower can reach 1%, while those at the bottom of the tower often reach 5%. Also, the liquid level, temperature, and pressure of the tower fluctuate within a certain range; especially the liquid level, whose fluctuations are quite large and cannot be stabilized at all. What’s going on? Please, expert!
If the levels at both the top and bottom are above the normal range, it might be due to flooding; try reducing the reflux at the tower top and the amount of heating steam at the tower bottom.
It is likely that flooding has occurred; stabilize the vapor volume at the tower bottom and the reflux rate, appropriately reduce the feed amount, and maintain a constant pressure at the tower top.
Actually, I don’t quite understand either. I just want to say that if the liquid level fluctuates greatly, it’s possible that you’re using a cascade control system for the liquid level; otherwise, if the steam supply were stable, there shouldn’t be such fluctuations as you described. . . Hehe. . . . Then there’s flooding. .
We use heat transfer oil for heating, which ensures stability; in our tower, one of the feed streams is supplied intermittently, and when that feeding stops, things get chaotic.
There are two possibilities: one is flooding, and the other is that the tray has been blown over. When flooding occurs, the liquid level in the reactor bottom also becomes unstable.
After stopping, the balance is a bit disrupted; need to make some adjustments
First, it is necessary to ensure proper material balance in the tower; by performing calculations, the withdrawal rates from the top and bottom of the tower can be controlled, and then the liquid level at the bottom of the tower can be regulated using the steam volume there.
If only the top and bottom of the tower are not up to standard, it may be due to an insufficient reflux ratio； If the liquid level cannot be stabilized either, excluding the issue of unstable operation, it may be flooding caused by excessive load or clogged trays. In distillation operations, the first step is to ensure proper material balance in the tower; by performing calculations, the amounts taken from the top and bottom of the tower are controlled, and then the temperature at the bottom of the tower is regulated.