Aspen for full-process simulation of an experiment
Thread Content
Once the separation scheme is established, should the design parameters and operating conditions for each column first be determined through a preliminary design using a simplified model of the column, followed by detailed calculations using a more accurate simulation model? Is this done for every tower? I don’t have any experience in this area, so I hope someone with more knowledge can give me some guidance. Thank you. I heard from a senior that it’s sufficient to use a strict tower directly, with the various parameters of the tower being determined through sensitivity analysis. I’m not sure if this is correct. Looking forward to the replies from the experts and teachers. . Thank you.
Both of the methods you mentioned work!
A simplified method can be used first to estimate the minimum reflux ratio, theoretical plate number, etc., followed by a precise calculation using RADFRAC. During these precise calculations, sensitivity analysis can be conducted to determine the optimal conditions, and design specifications can also be established to ensure that the results meet the required standards! ! !
What was said upstairs is completely correct. First, use the simplified method to estimate the minimum reflux ratio and the number of theoretical plates; then, when using the rigorous model, enter the number of theoretical plates, while the other parameters can be obtained through sensitivity analysis using both the simplified and rigorous methods. Then, by performing further optimization, you can determine the optimal conditions. I recommend using the first method; the second method is somewhat arbitrary when it comes to input conditions.
The error associated with the simplified method is relatively large, and its use is limited; for instance, it cannot be applied in cases of multi-stream feeding or side-line extraction. The minimum reflux ratio and number of theoretical plates estimated by this method can have errors of over 30% at times, which has a significant impact on subsequent optimization efforts and may lead to misleading conclusions. Therefore, after gaining some experience, it is still recommended to use strict models for direct optimization; with experimental or field data as a basis, it is generally possible to avoid mistakes.
If you have experience, you can directly use the strict model for calculations.
Can fractional distillation simulation be done using chemcd?
Thank you all, teachers. You have really become great people; when will I be able to achieve that as well? Sometimes, when striving hard, one can’t find the right direction; it’s frustrating
It’s possible, but its functions aren’t as powerful as those of A and P.
With the quick calculation results, don’t you have a clear idea?
If the simplified method is accurate, then why go through the hassle of performing precise calculations? I’ve met some senior engineers who, once given the feed conditions, can estimate things like the reflux ratio, so there’s no need to use the simplified method. For us shrimp soldiers, let’s take it step by step