What is the significance of the tower’s diameter change?
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In chemical plants, some towers are thicker in the upper part while others are thicker in the lower part. What is the purpose of this? I’d like to know, thank you
The diameter of the tower is determined by the flow rate of the material and the type of packing selected. For example, when using structured packing versus random packing, the calculated diameter of the tower section containing the random packing can be much larger; in such cases, a variable diameter approach may be adopted to improve the material mass and heat transfer efficiency.
The diameter change of the tower is mainly due to the requirements of changes in gas-liquid phase loads. For example, if the liquid load below the feed is significantly high, the distillation section above the feed section may need to be made narrower.
The diameter change of the tower is mainly due to the requirements of changes in gas-liquid phase loads. For example, if the liquid load below the feed is significantly high, the distillation section above the feed section may need to be made narrower.
Towers with a larger diameter at the bottom and a smaller diameter at the top are more common; this is mainly related to the distribution of vapor and liquid inside the tower. When the vapor and liquid load is high, a larger tower diameter is required, and vice versa.
In one sentence: the tower diameter is calculated based on the process. If the change is significant, it naturally also saves on investment.
In one sentence: the tower diameter is calculated based on the process. If the change is significant, it naturally also saves on investment.
The diameter of the distillation column is related to the load (refer to relevant information on column design). Whether the distillation section and the reboiler section should have the same diameter depends on the load of the vapor and liquid phases in the column. If vapor is used as the feed, the load on the distillation section is significantly higher, and the column diameter may be larger; however, in most cases liquid is used as the feed below its boiling point, so the load on the distillation section is relatively lower.
For example: the distillation vacuum tower has a variable diameter； The absorption tower for hydrochloric acid uses a tapered design; its main function is to absorb HCl gas and wash it to produce hydrochloric acid of a certain concentration. The part with a smaller diameter uses packing, and below that is a sieve plate. This approach is adopted firstly to save money, and secondly because the packing improves the efficiency of absorbing HCl! Stirred tank (with packing at the top, serving as the distillation section) ； The lower part is the floating valve tray, which belongs to the lifting section; the vacuum tower in a constant-pressure and reduced-pressure unit is a tapered tower. Because there is extraction in the middle, the amount of material decreases as one goes higher, so a larger tower diameter is not necessary. Another example is the solvent regeneration column in catalytic units; although the load on the upper trays is very low, due to the small number of trays, a variable diameter design is generally not used