If there are control valves on the pipeline from the side line of the fractionation tower to the stripping tower, the control valve assembly should be installed near the stripping tower to ensure proper regulation...
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As the title suggests, the material drawn off via the side line is usually in gas phase; why is it necessary to ensure that there is a liquid column ahead of the valve?； What kind of technical requirements are generally there? Are there any examples that can illustrate this? Thank you...
The liquid column ensures that a gas-liquid two-phase condition does not occur ahead of the valve
The output from the side line isn’t the gas phase, right? ?
Well, it can be in the vapor phase or the liquid phase.
Wouldn’t it be better if the feed to the stripper were in vapor form? Couldn’t the control valve for the margin also be operated with vapor?
Why can’t we add a gas-liquid separation tank? Ensure that what is drawn out is the gas phase.
The inlet of the control valve must not be in a gas-liquid two-phase state; otherwise, cavitation is likely to occur in the valve, making regulation difficult
If the vapor phase is drawn off through the side line, that ensures it’s a vapor phase; isn’t that also fine? Wouldn’t it be more beneficial for the stripping tower later on?
That separated liquid still needs to go to the stripping tower; adding energy before the control valve can also ensure it remains in vapor form. By passing a small amount of superheated steam, the amount of vapor that liquefies due to pressure drop is very small...
In this case, doesn’t the liquid phase also turn into a gas phase? This is not the same concept as the pumping phase.