What causes the wave-like variations in the tower operating pressure?
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During recent startup, it was found that operating one of the towers was quite difficult; the pressure at the top of the tower fluctuated in a wave-like manner, which in turn caused fluctuations in both the temperature at the top and the temperature at the bottom of the tower. After much consideration, the cause of this phenomenon remained unknown Does anyone know the heroes from Hai Chuan?
The pressure at the top of the tower experiences wave-like variations, due to fluctuations in feed rate, reboiler pressure, and reflux flow. . .
If the top pressure is stable, it may be due to instability in the feed (temperature or composition) or the reflux (flow rate or temperature)； For the second question, check the pressure of the tower to see if it is low. If the tower pressure remains unchanged, check the composition of the kettle liquid; if the composition is unchanged, verify the thermometer.
If it is indeed the case that \"the pressure at the top of the tower experiences wave-like variations\" first, the proportional gain in its PID should be set higher.
There are many reasons; since you haven’t specified the parameters and the exact conditions, there are numerous factors that could be considered, such as the feed composition, reflux temperature, reflux rate, the upward gas velocity inside the tower, as well as whether there are any blockages or failures in its internal components. . . . .
I think the cold reflux flow is too high, which causes excessive pressure inside the tower. That’s the case with our catalytic stabilizer tower: when the cold reflux pressure is reduced, the fluctuations decrease, but when it is increased, the pressure fluctuations become jagged
I think there are several issues with the backflow; it’s advisable to check the top temperature a bit (for units that have just started operating)