Insufficient heat source for the absorption stabilization system
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In a catalytic cracking unit, there is a shortage of heat source in the absorption and stabilization system, which prevents the temperature at the bottom of the stabilizer from rising – how can gasoline quality be ensured?
Reduce the pressure appropriately, but liquid hydrocarbon tanks may produce non-condensable gas, which needs to be vented over time. It would be best to increase the heat source by raising the reflux of the reprocessed oil back to the tower.
A short-term shortage of heat source can lead to a slight reduction in the stable pressure in order to ensure that the gasoline meets quality standards; however, this also lowers the pressure in the absorption and reabsorption towers, reduces yield, and increases the amount of non-condensable gas emitted. To address this, it is necessary to identify the causes, such as low temperature of the fractional distillation tray, low reaction temperature, insufficient secondary reagent, and excessive load on the stabilizer tower, in order to solve the problems at their root.
1 Minimize the supplementary absorption dose while ensuring effective absorption； 2 Appropriately increase the temperature of crude gasoline and the supplementary absorbent ； 3 Appropriately increase the temperature of the rich gas entering the tower ； 4 Reduce heat extraction in the absorption section ； 5 Increase the feed temperature of the desorption tower ； 6 Increase the feed temperature of the stabilizer tower ； 7 Reduce the reflux rate and top pressure appropriately while ensuring the distillation efficiency of the stabilizer column.
When there is insufficient heat source in the stabilizer tower, pressure reduction can generally be employed to ensure the vapor pressure of gasoline remains stable. The material balance issue in the workshop can be considered comprehensively. Reaction unit feed rate, nature of crude oil, reaction temperature, and so on. Also, in typical installations, the intermediate section is used as a reboiler both for the stripping tower and for the stabilizing tower; if there is not enough heat, steam heating can be considered for the stripping tower to address this issue.
May I ask, how does reducing the operating pressure of the stabilizer affect the pressure for absorption and desorption? There’s no direct relationship, I guess. 3# Son of Petrochemicals qing
This post was last edited by hsxcy on 2009-12-1 22:39. May I ask how reducing the operating pressure of the stabilizer can affect the pressures of absorption and reabsorption? There’s no direct relationship, I guess.
Sometimes it’s possible to focus on one thing at the expense of another; it is recommended that if oil heating is being used, to skip it and opt for steam heating instead. At generally 200°, there should be no major issues.
A comprehensive consideration is needed, along with short-term measures to reduce backflow.
I can understand the need to reduce pressure appropriately to maintain gasoline quality when there is a shortage of heat sources in the stabilizer tower. But why is it necessary to adjust the pressure of the absorption and separation systems as well after the pressure in the stabilizer tower is reduced?