With unchanged operating conditions, does increasing the feed temperature lead to an increase or a decrease in internal reflux?
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With other operating conditions unchanged, does internal recirculation increase or decrease when the feed temperature is reduced?
Under normal conditions, lowering the feed temperature reduces the degree of vaporization of the material, thereby decreasing the gas-phase load. To maintain product quality, the extraction rate is increased to raise the gas-phase load within the tower; as a result, the internal reflux decreases accordingly…
Due to the reduction in total heat, one approach is to increase the amount of heat supplied, and the other is to reduce backflow (which would lower the purity of the components at the top of the tower). However, you didn’t clarify what kind of device it is!
If the feed temperature is low, the vaporization rate decreases, and the internal recirculation in the upper part of the tower also decreases accordingly
Of course it has to be reduced; simply put, the feed temperature is lowered. In other words, the heat balance of the entire tower must remain unchanged; if no other adjustments are made, the cold reflux will definitely decrease