The challenge of setting the reboiler height
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Dear experts, generally, according to the manuals, for vertical thermosyphon reboilers, it is sufficient that the height of the tube sheet be roughly equal to the liquid level at the bottom of the tower; the difference should not exceed 0.5 meters. I already have a tower, with a liquid level height of 9 meters, and the reboiler is 3.5 meters high. If I place the reboiler on the ground, the height difference will be even greater, and the performance should be better. My question is: is that true? Could there be any other problems? Could someone with experience give some advice?
With a greater height difference, the effect should be better, right? ? ? Can’t understand
The installation location should be determined during the redesign of the reboiler; placing it too high or too low will cause problems
A large height difference will cause an increase in the length of the sensible heat section of the reboiler and a decrease in the length of its latent heat section. Generally, the tube length available for reboilers is sufficient, so the impact is minimal. When the tube length (i.e., the heat exchange area) is adequate, reducing the height of the reboiler helps to increase the driving force of the heat cycle. It is not recommended to raise the height of the reboiler; in vertical thermosyphon reboilers, the upper tube sheet should not be above the liquid level in the reactor bottom. In summary, when designing vertical thermosyphon reboilers, the upper tube sheet should be at the same level as the liquid level in the reactor bottom – it can be lowered, but not raised
The reboiler must be raised, not lowered; if it is lowered, the liquid will cover the reboiler, leaving no space for evaporation and making it impossible to operate
When the height relationship between the reboiler and the bottom of the tower is normal, it is sufficient to maintain the liquid level in the reboiler at one-third
I’m sure your questions are already quite clear
What was said on the 5th floor is completely correct – the reboiler cannot be filled entirely with liquid.