Chemical processing tower equipment: [Weekly Topic] What aspects should be considered when designing the diameter-changing section of a tower?
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This post was last edited by Benben Xuan on 2011-3-8 17:45. What aspects should be considered when designing the diameter-changing section of a tower? Note: 1. All participants will receive a reward ； 2. This is an upgraded version of the Daily Question; please engage in in-depth discussions and feel free to post your replies without hiding them.
The last edit to this post was made by Benbenxuan on 2011-3-8 at 17:46. Reply to 1# Head & Shoulders: 1. When the vapor load or liquid load on a certain tray is very high, it is generally necessary to change the tray diameter. 2. When the feed is subcooled liquid and the vapor load below the feed tray is greater than that above it, the distillation section needs to have its diameter changed. 3. Changing the tray diameter is done to increase the gas velocity and enhance operational flexibility
The last edit to this post was made by Benbenxuan on 2011-3-8 at 17:46. Reply 1#: For Head & Shoulders, the gas velocity in both the upper and lower towers should be within the specified range. Let’s just talk about this point
This post was last edited by Benbenxuan on 2011-3-8 17:46. I don’t know! ! ! ! ! ! ! ! ! !
This post was last edited by Benben Xuan on 2011-3-8 17:47: the stress distribution is uneven； It is quite difficult to manufacture; please study everyone’s answers
This post was last edited by Benbenxuan on 2011-3-8 at 17:47. Attention should be paid to the cone angle of the design change, whether there are folds, and the thickness of the transition section.
This post was last edited by MaiKenXueYaoLong on 2013-10-29 at 18:31. Issues related to transition section calculations, pressure loads, and bending moment loads. The calculation is complicated and prone to instability!
Factors related to the equipment need to be taken into account, as well as those related to the process; the flow rate can be changed
Generally, a variable diameter is used when the gas-liquid phase loads in the rectification section and the stripping section change significantly； Sometimes, the distillation section and the retraction section use the same tower diameter, while the reactor bottom has a varying diameter, mainly to ensure an appropriate residence time for the liquid phase or to provide sufficient space for the gas phase
Diameter variation is primarily used to adjust the gas velocity to meet process requirements; in the design phase, attention must be paid to the angle and thickness of the diameter-changing section to prevent equipment instability
Diameter variation is primarily done to save money; while meeting the requirements of hydraulic loading, it can sometimes also improve operational stability at lower limits