Relative position of the bottom reboiler and the tower
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How is the relative position between the reboiler at the bottom of the tower and the tower calculated? Please share your thoughts. Or are there any reference materials where I can find this information? Please give me some advice. Thank you.
A kettle-type reboiler or a vertical reboiler? Different types have different installation requirements.
For a counter-current reboiler, the lowest liquid level in the column should be at the same level as the flange above the reboiler, so that the reboiler is completely filled with liquid and no part of it remains inactive.
For vertical thermosyphon heat exchangers, it is required that the upper tube sheet of the heat exchanger be at the same level as the liquid level in the tower bottom. . . .
The original poster can take a look at the section on reboilers in Chapter 15, Heat Exchangers, of Volume 1 of the Chemical Process Design Manual
In short, as long as the installation conditions are taken into account, it’s better to have a reboiler at a lower position; it has advantages in every regard, and there are no disadvantages
Depending on the reboiler type and installation method. Initially estimate the vaporization section, calculate the inlet friction loss, roughly determine the liquid level driving force, conduct preliminary calculations, make adjustments, and take into account installation and maintenance conditions to finalize the height. Suggestions: 1. For vertical thermosyphon reboilers, adjust them downward by 0.5 m; the increase in driving force is minimal, less than 100 mm. Rather than placing the reboiler at a lower position, it is better to install baffles at the bottom of the tower to maintain a high and constant liquid level flowing into the reboiler. 2. Refer to the \"Chemical Process Design Handbook\" and Chapter 7 of \"Process Design – How to Ensure Operational Reliability\".
The connection point between the reboiler outlet and the tower is also very important; during design, it is necessary to take into account the possibility that an excessively high liquid level in the tower bottom could cause the reboiler to be sealed by liquid.
I also have doubts in this regard; in our company, the design by the design team features the bottom of the tower being at the same height as the upper tube sheet of the reboiler, which seems rather unreasonable