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For small high-level tanks, it is necessary to control the outlet flow rate. Since the pressure before the control valve is determined by the liquid level, it remains unstable, making it difficult to maintain a specific flow rate. Are there any good solutions?
The control of the liquid discharge flow rate in the sump is to be achieved through a level-controlled valve; the instability is either a problem inherent in the original design or one that has arisen later on. If there are issues with valve selection due to design factors, then if they are of a subsequent nature, it is likely a problem related to the methods of instrument control and regulation.
First of all, thank you. Maybe I didn’t explain it clearly. It’s about the high-position groove in the design – fluid needs to flow into the reactor at a certain rate. How can this steady flow rate be controlled? The usual approach is to use a flow meter to control the valve, but the error resulting from this method is quite large
There is a hierarchy here: you need to ensure that the liquid level control is the top priority, and only then focus on stabilizing the flow rate? Is there a discrepancy between the amount that comes out and the amount guaranteed by the liquid level? Should we consider installing a buffer tank, with a flow control valve placed after it? Should we consider this equivalent relationship? What if we consider only the liquid level without taking flow rate into account, or consider the amount by which the liquid level increases (the inflow volume)? ? I’m not familiar with the site; these are just some ideas for reference.
No, I don’t take the liquid level into consideration; the design requirement is a stable outlet flow rate
If there is feedback control via flow meters and control valves, the main thing to check is whether the parameters are reasonable