If there is an oil-water separation tank for reducing the pressure, why is a water seal tank still needed?
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If the vacuum tower already has a oil-water separation tank at the top, why is a water seal tank still needed?
To prevent external air from entering the vacuum system and disrupting the vacuum, the atmospheric leg refers to the height from the vacuum system to the water seal tank; it serves to maintain the vacuum condition. This height is usually set at 10.5 meters, as atmospheric pressure can push water up to a height of 10.33 meters, which helps to prevent air from entering. The atmosphere can only push water up to 10.33 meters, preventing atmospheric pressure from getting in. Be sure to submerge the water in the water seal tank to seal the atmospheric leg before driving. It’s actually a transition from the negative pressure system to atmospheric pressure; it’s similar to the three legs inserted into the water seal tank, commonly known as atmospheric legs
The overhead oil-water separation tank in the vacuum distillation tower prevents external atmospheric air from entering the vacuum system through the atmospheric leg in the event that the vacuum level is lost; therefore, the atmospheric leg is either inserted directly at the bottom of the tank or enters the separation tank from there. The water seal tank is used to seal the gas phase of the condenser of the vacuum ejector pump (the gas phase at the outlet of the three-stage extraction condenser or the water ring pump), and it also prevents outside atmospheric air from flowing back into the vacuum distillation column in the event that the vacuum level is lost, thereby avoiding serious accidents. Generally, there is also a water separation tank behind the water seal tank. Haha
As the name implies, a water seal tank serves to act as a water seal, preventing backflow in the vacuum tower