Thermal reflux in the vacuum tower

It must be for the thermal balance of the entire tower

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This situation is mainly due to the design of the oil collection tank; when all the oil is extracted, heat reflux is necessary to maintain the liquid phase load in the filler below, while cold reflux returns heat to the tower after absorbing it. If it’s not available in level 2, is it provided by the cold return from level 3? You can take a look at the structure.

Both cold reflux and hot reflux are calculated based on the heat balance of the tower; they are both determined through calculations at the design stage, taking into account the properties of the raw materials In fact, both cold reflux and hot reflux can achieve certain results; it’s just that optimization calculations were carried out during the design phase to determine the most effective approach