What is the relationship between pressure and liquid level in a circular tower?
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There is a circulating pressure inside the tower; if the pressure decreases, how does the liquid level change, and vice versa? At the site, the decommissioned neutralization tower shows a general decrease in system pressure; the pressure at the tower’s outlet valve also drops (the circulation pressure falls), while the liquid level rises, for similar reasons. I don’t understand why the liquid level dropped.
As pressure increases, the amount of material discharged generally increases; as pressure decreases, the amount of material discharged decreases. There is usually a lag in the liquid level, which is why you see the phenomenon you observe.
Hello, what you’re referring to seems to be the outlet pressure of the pump; there is also a system pressure inside the tower. I’m sorry, could you please explain it in more detail? I don’t seem to have understood it completely
As the system pressure decreases, the boiling point of the material in the system drops, resulting in an increased rate of evaporation. Consequently, the liquid level first drops. Due to the reduced pressure, a large amount of the material originally in the tower flows back, which lowers the temperature inside the tank and reduces the rate of evaporation; this, in turn, leads to an increase in the liquid level. Conversely, the system pressure increases, the material accumulates inside the tower, the reflux decreases, and the liquid level drops.
Our material is acetylene gas; the pressure at the outlet (system pressure) serves as the driving force for its flow. The liquid that circulates is a purification liquid, and in addition, the liquid used for spraying also serves to reduce temperature. What’s unclear is why, when the pressure drops (we can adjust the pressure in our system ourselves), the liquid level rises, and vice versa.
Thank you for your message. If the pressure decreases, the boiling point also decreases, resulting in increased evaporation. The material (acetylene gas) and the circulating liquid both evaporate, so shouldn’t the liquid level drop? And what does the so-called backflow refer to? Thank you very much
{:3_49:} Caused by changes in the liquid volume in the tower
Thank you very much. I’ve also looked into this step regarding the liquid holding capacity. May I ask about the pressure drop? When that occurs, does the liquid settle, meaning the supporting force is insufficient? In simple terms, the liquid level rises
{:3_60:} It’s not possible to say exactly who causes what in this case. The most obvious reason is that there is too much liquid in the tower filler; this results in a higher liquid column, which in turn increases the resistance to gas flow. As a result, the pressure difference between the top and bottom of the tower increases. The fundamental causes are related to the pump flow rate, the flow rate and pressure of the gas used for stripping, as well as the temperature of the tower