Questions for November 5, 2017; replies can earn 0–6 points (no scoring for replies sent more than 1 day after posting. Thank you for your replies)
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Why is the upper diameter of the vacuum tower smaller?
In the upper part of the vacuum tower, since both the gas and liquid load are relatively low, the tower diameter is also smaller in order to reduce equipment costs and heat losses.
Answer: At the upper part of the pressure reduction tower, since the vapor and liquid phase loads are relatively low, the corresponding tower diameter is also smaller.
Since the vapor-liquid load in the upper part of the vacuum tower is relatively low while it is higher in the lower part, the diameter is larger at the bottom and smaller at the top
In the upper part of the vacuum tower, since both the gas and liquid phase loads are relatively low, the corresponding tower diameter is also smaller. Due to the high temperature at the bottom of the vacuum distillation tower, the residence time of the product at that location is too long, which facilitates chemical reactions such as cracking and condensation-coking. These reactions affect the quality of the product and are also detrimental to the long-term safe operation of the tower. To reduce the residence time of the product at the bottom of the tower, a smaller tower diameter is also used in the stripping section of the tower. In the vast majority of vacuum distillation columns, the diameter of the stripping section at the lower part and the reduced-diameter section at the upper part is the same, which facilitates the manufacturing and installation of the column. In the middle section of the vacuum distillation column, since the gas and liquid phase loads are relatively high, a larger diameter is chosen there; as a result, the column has a shape that is narrow at both ends and thicker in the middle.
In the upper part of the vacuum tower, since both the gas and liquid load are relatively low, the tower diameter is also smaller in order to reduce equipment costs and heat losses.
In the upper part of the vacuum tower, since the vapor and liquid phase loads are relatively low, the corresponding tower diameter is also small. At the bottom of the vacuum distillation tower, high temperatures and a long residence time of the product at that location can lead to chemical reactions such as cracking, condensation, and coking, which affect product quality and are detrimental to long-term safe operation. To reduce the residence time of the product at the bottom of the tower, a smaller diameter is used for the stripping section as well. In the vast majority of cases, the diameter of the stripping section at the lower part of the pressure reduction tower is the same as that of the constricted section at the upper part, which facilitates the manufacturing and installation of the tower. The middle part of the vacuum tower is due to vapor. The liquid load is relatively high, so a larger diameter was chosen accordingly. Thus, it forms a shape characterized by being narrow at both ends and thick in the middle of the pressure reduction tower
At the upper part of the vacuum tower, since the loads on the vapor and liquid phases are relatively low, the corresponding tower diameter is also smaller.
In the upper part of the vacuum tower, since both the gas and liquid phase loads are relatively low, the corresponding tower diameter is also smaller.
In the upper part of the vacuum tower, since both the gas and liquid load are relatively low, the tower diameter is also smaller in order to reduce equipment costs and heat losses.
Since the vapor-liquid load in the upper part of the vacuum tower is relatively low while it is higher in the lower part, the diameter is larger at the bottom and smaller at the top