Reboiler heating temperature
Thread Content
The \"Process Piping Installation Design Manual\" states that in heat-siphon reboilers, the heating temperature is higher than the bubble point temperature of the product at the bottom of the tower, while in single-pass reboilers, the heating temperature is equal to the bubble point temperature of the product. How are these two heating temperatures determined? Why do things have to be like this?
A reboiler is used to heat the liquid that has condensed in the device again, causing it to evaporate. Since the vaporization rate of the reboiler is 25–30%, when a large amount of vaporization occurs, a single pass is not sufficient; a full cycle is required. Therefore, the temperature of the heating medium is set higher than the bubble point temperature of the product at the bottom of the tower in order to facilitate faster and more effective heat transfer. Using a one-pass approach mainly takes into account whether the material at the bottom of the tower is thermosensitive, due to concerns over decomposition or coking. So the temperature cannot be too high.