Liquid level fluctuation problem in the fractionation tower
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In the internal operation interface, the valve positions of the feed and discharge control valves for the distillation tower are set to manual mode, and the reflux valve is also set to manual mode; the tower pressure and temperature remain relatively stable. Why then does the liquid level fluctuate periodically (between 50-60%)?
The separation effect isn’t good, I’ve encountered this issue too; the reason is unknown.
It seems that there isn’t enough reconstituent; it needs to accumulate on the tray for a while before reaching the height of the overflow weir and then flowing down, causing periodic fluctuations in the liquid level at the bottom of the tower
The properties of the oil aren’t very stable, right? If there are significant fluctuations, it might be due to excessively low temperatures; try raising the bottom temperature a bit. . .
It seems that the components are unstable and there are changes in them; the proportion of components that lie between the heavier components at the bottom of the tower and the lighter components at the top has decreased
The fluctuations in internal reflux are mainly caused by the addition of fuel; you can check the boiling range of the oil at the bottom of the tower during periods of significant fluctuation – there must be some vaporization occurring at that point