Fluctuations in liquid levels upstream and downstream of the kettle reboiler
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The liquid level in the tower bottom upstream of the kettle reboiler drops rapidly, the liquid level downstream of the overflow plate rises quickly, the temperature of the reboiler decreases, the amount of condensate increases, and the pressure at the top of the tower rises; afterwards, things gradually return to normal, only for this cycle to repeat after some time. Has anyone encountered this situation? What is the reason? It is initially suspected that there is some issue somewhere between the tower bottom and the reboiler overflow plate, but the exact cause is unknown.
It is estimated that some trays in the tower are flooded; control the heat supply to the reboiler properly.
The tower is a packed tower, and the main issue is that the liquid level in the bottom of the tower drops from its normal level, while the liquid level behind the reboiler’s overflow plate rises, which is abnormal. If the packing prevents liquid from flowing, the liquid level behind the overflow plate should drop; the liquid level in the tower bottom is likely related to the height of the partition, pipeline resistance, and the degree of boiling