A question regarding the lower section of a distillation column
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I’ve been working at the company for only a short time. Today, in the office, I saw a distillation column with a double-overflow tray structure. I noticed that the height of the outlet weir in the middle was higher than that of the outlet weirs on the sides; I’m not sure what the advantage of this is
First, the height of the overflow weir affects the height of the hydrostatic layer on the tray, which in turn influences the tray pressure drop. This measure is intended to balance the pressure drops of the two liquid-phase streams, thereby ensuring a uniform distribution of the gas phase across the entire plate.
Hmm~ Yes, the height of the overflow weir does affect the liquid level height on the tray. I’m just not sure if this makes sense – maybe because there is more gas present in the middle, the static liquid level there is also higher. Hehe~~ I’m not sure if this understanding is correct
Because the middle overflow weir is long while the side overflow weirs are short, the overflow intensity of the side weirs is greater than that of the middle weir. To reduce the liquid level difference on the tray between the inlet and outlet weirs, and while taking into account the height of the clear liquid layer on the tray, the heights of the overflow weirs on both sides are set to be relatively lower