Xylene column level

I suspect it’s due to the temperature at the bottom of the tower, but even with the temperature control remaining unchanged, the liquid level still fluctuates.

Due to limitations in my expertise, I’m not sure whether I can clearly explain what substances are present inside the xylene tower It’s good to have a judgment too.

There should be abnormalities in temperature, pressure, and liquid level. Observe the amount of material being heated to see how it compares to normal levels, check the pressure at the top of the tower, and also conduct a thorough analysis of the composition of the feed

Imbalance between gas and liquid inside the tower; I hope this can provide you with valuable insight

:If the liquid level at the bottom of your tower changes, then the temperature at the bottom must also change; I’ve never seen it remain unchanged. A few days ago I encountered a similar issue – the liquid level was unstable. This could be due to problems with the connection pipes between the tower and the reboiler, or there might be issues inside the tower itself, such as accumulation of material or poor flow. I’ve encountered this a few times before: insufficient feed to the reboiler (that is, blockages in the pipelines) can cause fluctuations, but it has little impact on the product from the tower. If the problem lies within the tower itself, such as blockages in the liquid seal or packing, it depends on the heat consumption and pressure differences. Generally, if the blockage is located far away from the reboiler, the pressure differences won’t change much, or even not at all, while heat consumption will be high. If the blockage point is close to the reboiler, the change in pressure difference will be significant, but the heat source consumption may not be as noticeable

What measuring instruments are being used? Process conditions?

The description isn’t very clear; I guess it’s likely a problem with the reboiler. Fluctuations in the reboiling temperature, or fluctuations in the amount of steam used for heating the reboiler (fluctuations in the opening degree of the fuel gas control valve in the reboiler), can cause pulsative evaporation, resulting in pulses of liquid from the equipment and pipes entering the bottom of the tower. Check to see if this is the reason If excluded. Look for other factors.

Have you considered the possibility that there is a reboiler leak, causing water to enter the bottom of the tower? This can significantly affect the liquid level in the tower bottom.