Can the reboiler at the bottom of the Aspen column be considered as a tray?
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Can the reboiler at the bottom of an Aspen column be considered as a tray? And if the bottom of the column is a reboiler, can it still be regarded as a tray? I seek guidance from those with expertise
Yes, the default first unit is the condenser, and the last unit is the reboiler
Yes, by default the reboiler is a plate, and so is the top condenser.
This post was last edited by robinbird on 2011-11-3 19:34. Different types of reboilers vary. If it is a straight-bottomed reboiler, it is equivalent to one theoretical plate, as there is a complete gas-liquid equilibrium process in the bottom of the tower. The efficiency of a thermosyphon reboiler is less than that of one theoretical plate, as there is some backmixing in practice; this becomes clear when looking at the working principle of a thermosyphon reboiler. This actually has nothing to do with simulation software. And it is related to the type of reboiler. The condenser also has this problem. If the product is withdrawn by stripping, there is no gas-liquid equilibrium at the top of the tower; instead, the gas phase is completely condensed, and in that case the condenser is not considered a theoretical plate either. However, if there is a gas outlet at the top of the tower, then a gas-liquid equilibrium exists, and it is only in this case that it corresponds to one theoretical plate. Is it equivalent to one theoretical plate? In principle, it depends on whether there is complete gas-liquid equilibrium.
Reply to 4# robinbird: Thank you, it’s written in great detail