Heat issues in catalytic fractionation towers
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I often hear the experienced workers in the workshop talking about \"heat rising in the distillation tower\" and \"heat falling in the distillation tower\". What does this mean? Please, the experts could provide a detailed explanation from a fundamental perspective
Explanation: 1. Ideal condition: If the entire distillation column is designed to have a uniform heat distribution, and assuming it has 9 trays, with a temperature of 200°C at the bottom and 100°C at the top, then the temperature decreases by an average of 10°C per tray from bottom to top, following a stepped pattern. 2. Heat upward movement: This refers to the situation where, under ideal conditions, the temperature of this tray should be 150°C; however, in reality it is 155°C. 3. Heat descent: The opposite of ascent. Practical application: In production, it is often necessary to separate the components under different conditions. For example, when more gasoline components are desired, heat needs to be applied to transfer the lighter components from diesel fuel into the gasoline component. The same goes for the other way around!
Thank you so much! There is another question: generally, what adjustment methods are used to move the heat in a fractionation tower upward or downward?
Stay for 24 consecutive hours before DCS, and you’ll naturally know
Control the reflux rate and the temperature returning to the tower; a lower reflux rate will increase the temperature in the upper part, but be careful with the reflux ratio to prevent flooding of the tower. Controlling the temperature returning to the tower means reducing or increasing the heat removed.
The upward movement of heat in the distillation tower and its downward movement represent changes in the proportion of heat extracted from the intermediate stage circulation