What are the reasons for intermittent reflux at the top of a distillation column?
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The tower is approximately 24 meters tall and has a volume of around 0.96 cubic meters. The condenser at the top of the tower is of a small U-shaped design; the refrigerant flows through the tube side, while the material flows through the shell side. The material enters and exits at one end, while the other end serves as an air vent. The reflux process cannot continue continuously – it occurs in pulses. What is the cause of this? Please ask an expert for help! ! !
This post was last edited by CHANGBAISHI on 2017-4-2 at 18:45. There is a problem with the condenser; the amount of material being condensed is low； Either the amount taken out is too large. . . It is recommended to strictly adhere to the specified process parameters. Stabilize the reference point, then proceed to analyze and adjust the next part.
The temperature is too high, resulting in poor condensation or the intrusion of non-condensable gases
The feed volume is greater than the discharge volume, with a certain amount of venting; the amount of venting cannot be determined
If it is a fully condensed heat exchanger, then there might be air present, causing an air blockage. If it is a fractional condensation heat exchanger, it may be due to insufficient cooling capacity or a low pressure difference on the material side.
1. There is a shortage of gas in the shell side; this lack of gas leads to negative pressure being created after the material cools, resulting in a phase of liquid and a phase of negative pressure within the shell side. Verification is simple: turn off the recirculation flow and wait to see if the situation improves, but this only provides a temporary solution rather than a permanent one; if there is still little airflow in the shell side, negative pressure may still occur. 2. There is non-condensable gas present; I’m not sure how the heat exchanger should be arranged. Logically, non-condensable gas shouldn’t come out along with the liquid. 3. I’m wondering if there is a liquid seal at the outlet of your heat exchanger; perhaps excessive pressure caused the liquid seal to fail and allow only gas to pass through
We know the poster; what they’re saying is a bit similar to the issue with the tower that occurred in one of our company’s workshops