Distillation tower diameter
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For distillation columns as well, why is the diameter of the entire column the same in some cases, while it differs between the upper and lower parts in other cases?
The distillation volume is different. It is recommended to learn the principles of the process first; then this will not be a problem. Understanding such problems isn’t very useful for grasping the principles of the overall process.
This problem is similar to the situation where, when eating, some people use large bowls while others use small ones. Think for yourself
Simply put, it is related to the gas load, throughput, and flow rate. If we are to be thorough, actual cases must be analyzed; for example, whether there is a reduction in diameter or local expansion is closely related to the internal structure and process conditions.
It is normal for the diameters of equipment cylinders to vary in different specifications. Some have wall thickness segments, while others have diameter segments. Simply put, it is determined by the manufacturing process. Equipment with vaporization requires a certain gas phase space, and in some cases the cylinder diameter needs to be changed due to the requirements of the internal components.
This depends on the medium and operating conditions. For media with low boiling points, low operating temperatures, and minimal impact of temperature changes on viscosity, a uniform diameter is usually sufficient. In contrast, for media with high boiling points, high operating temperatures, a tendency to coking, and high viscosity, a reduced diameter at the lower part is employed to shorten the residence time of the material and reduce the risks associated with high temperatures
It is determined based on the design conditions; the functions vary, with some serving for flashing and others for distillation
The appropriate tower diameter should be selected based on the specific process conditions: if gas is used as the feed and the load at the upper part is high, a tapered tower with a larger diameter at the upper section should be chosen； If the difference between the upstream and downstream loads is not significant, choose the same diameter ； If the feed rate is high and the load at the lower part is large, a tapered tower with a larger diameter at the bottom can be chosen.