Regarding how to implement the pumparound for the intermediate cooler in the atmospheric and vacuum distillation tower

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This post was last edited by davidcao on 2017-12-26 at 14:00. In atmospheric and vacuum distillation units, intermediate cooling and reflux are required for the atmospheric tower and the vacuum tower; the examples in HYSYS and ASPEN+ both use a Pumparound approach, wherein a stream of liquid is subcooled before being returned to the upper trays of these towers. However, for the liquid to return to the tower after passing through the intermediate heat exchanger, it still needs to overcome a height difference. How can this circulation be achieved without using a mechanical pump? Considering that the density further increases after the liquid is supercooled, it is not possible to utilize the density difference; ultimately, only the difference in flow resistance remains, although this difference seems difficult to calculate accurately. I hope to get help from Haiyoumen.