Some issues regarding the shortcut model settings
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I want to use a shortcut method to calculate the theoretical number of plates required for distillation, and there are a few things I don’t understand, so I’d like to ask everyone: 1. In “minimum reflux”, what does “Ratio to minimum” refer to? Is it the multiple by which the desired reflux ratio should be set compared to the minimum reflux ratio? 2. What does the Estimated Fenske index in Fenske Estimates refer to, and how is it set? 3. There’s also a question regarding distillation columns: how to model a column with a changing diameter? I hope experts can offer some guidance; I would be extremely grateful!
1. In “minimum reflux”, the “Ratio to minimum” refers to setting an appropriate reflux ratio as a multiple of the minimum reflux ratio. 2. The Estimated Fenske index in Fenske Estimates refers to the initial estimate for the number of Fenske trays; the system defaults this value to 2. Refer to the help documentation: “The Fenske Estimates WINDOW can be accessed via the Fenske Estimates button on the Main WINDOW. It allows the user to enter initial estimates for the number of Fenske trays. If the user wants to set these values as fixed specifications, it must be done in the Specifications WINDOW.” 3. To specify a variable diameter for the distillation column, this should be done under Tray Hydraulics Packing.
The expertise upstairs is really great; I only know that the Ratio to minimum refers to setting an appropriate reflux ratio as a multiple of the minimum reflux ratio. Information regarding Fenske Estimates can still be found in the petrochemical design manuals.
Got it, thanks for the answer from the second floor!