How is the mid-tower pressure drop calculated in Pro II?
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I’m currently learning ProII, and I need to use the pressure drop of towers in my work. Are there any common methods for calculating it? Or **calculate? Experience points?
The tower pressure drop can be set manually; if an accurate value is required, it must be determined through hydraulic calculations.
It depends on the number of target boards you have; generally, 7 KPa is used for each actual board, which allows the total pressure drop to be calculated. For the initial calculation, a rough value for the pressure drop is sufficient; it won’t have a significant impact on separation. Once the theoretical number of plates and the actual number of plates are determined, the tower pressure drop can be adjusted accordingly.
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When entering data before simulation, an estimate is made based on experience; once the calculation is complete, the pressure drop value is included in the result report
I remember that the default pressure drop value in Aspen is 0.0068 ATM. I’m not sure if I remembered it wrong. In that case, it would be around 0.68 KPA, which is a bit different from what a friend upstairs said.
It’s roughly 0.7 kPa for us
Well, they are all around 0.5–0.7 kp; the value is lower in the vacuum tower and higher in the pressure tower
Is that person upstairs who said 7 kPa misleading others a bit? For typical plate columns, 1 kPa per plate is generally sufficient. In practical engineering, just check the DCS. There’s no need to pick randomly on your own
The pressure drop is given; it should be adjusted accordingly based on one’s design requirements. Generally, a pressure drop of 0.7 Kpa is adopted for a single plate, or the total pressure drop of the entire tower can be used directly
The pressure drop across the tray is related to hydraulic properties, and it varies depending on factors such as the size of the tower, the operating pressure of the tower, and the properties of the material. The results obtained from simulations provide only a reference, indicating the level of influence of various factors; therefore, simulations cannot be relied on entirely. This is my personal understanding; please correct me if I’m wrong.