Function of the gas-liquid communication line in some condensers and determination of the liquid seal height
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Dear Hai Youhao, I have a question: The steam coming from the top of the distillation tower is condensed in a partial condenser, where it is separated into gas and liquid phases. The gas phase goes to the reflux tank via the equilibrium line, while the liquid phase also enters the reflux tank through the liquid pipeline. There is a connecting line between the liquid-phase pipeline and the gas-phase pipeline (equilibrium line), with a liquid seal height of 450 mm (see the attached diagram for details). I have the following question: 1. What is the purpose of setting up the aforementioned connection lines? 2. What is the purpose of setting up a liquid seal? 3. How is the liquid seal height determined? Thank you! ! !
1. The function of the connecting line is to collect the liquid phase in the pipeline returning to the tower top. 2. And maintain the liquid level in the condenser. 3. The liquid seal height is determined by the system pressure.
Thank you for the explanation; I’m still not quite sure. (1) Is the purpose of the connecting line to return the gas phase that is dissolved or entrained in the liquid phase flowing out from the bottom of the condenser back to the gas line? (2) What is the purpose of maintaining a liquid level, to prevent the vapor at the top of the tower from passing directly through the condenser and going to the reflux tank? (3) The liquid level height is determined by pressure – what kind of pressure or pressure difference is meant here? Thank you
I’m really sorry; I came up with this based on the diagram you provided and my own past experience. I’ve never seen such an operation unit before, so I’m truly apologetic.
Maintaining the liquid level is essential to ensure the effectiveness of the condenser
I wonder if the gas pipeline above is the safety valve vent pipeline? Under normal conditions, steam condenses into a liquid and enters the lower liquid-phase pipeline, while the upper gas-phase pipeline is closed or semi-closed during normal operation. If a liquid seal is used to maintain the condenser liquid level, should a U-bend be installed in the condenser outlet pipe as well? Otherwise, if this liquid seal is higher than the recovery tank, its function will be merely to prevent steam from above from entering the liquid-phase pipeline. I’m a beginner too; everyone is welcome to offer criticism and suggestions.