A piping use for a reboiler
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The reboilers that are commonly seen have one inlet and one outlet; however, the amine liquid regeneration reboiler in this new installation has two outlets leading to the bottom of the tower. Please take a look and share your thoughts. As shown in the figure
It is likely used when the liquid level is low, or for waste discharge.
The line you have marked is the normal material pipeline from the bottom of the tower to the reboiler.
I guess it’s to maintain an equilibrium level of liquid
What you mentioned should be the normal bottom feed pipe, while the other one is likely for level control.
Are there the remaining two pipelines with arrows? Such a reboiler configuration cannot be established.
If I understand correctly: for these two pipes in the lower shell side of the reboiler, the one on the left is the feed line for the material, which comes from the tower; there is an oil collection tank at the extraction point on the tower. The pipe on the right leads directly back to the bottom of the tower. There is a partition inside the reboiler between these two pipes, meaning that the liquid levels on either side are separated from each other. The tube bundle of the reboiler is located on the left side of this partition, while there is no such tube bundle on the right side； The oil outlet at the bottom of this tower should have a separate extraction port at the base of the tower; the gas phase returning to the tower from the top of the reboiler enters the space at the bottom of the tower, below the oil collection tank
There are partitions inside the reboiler, used for draining the liquid
This is a kettle-type reboiler, and it’s related to its structure; once you understand the internal layout, you’ll know what that pipeline is. I’ve labeled the three pipelines for you: 1 is the feed pipeline, and 2 is the steam generated after heat exchange, which is sent back to the regeneration tower. We call this secondary steam, and it represents an efficient use of heat. 3 refers to the lean amine solution that enters the regeneration tower after heat exchange. There is a partition between 1 and 3, which separates the lean and rich amine solutions inside