Sensitivity analysis
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The simulated process is parallel separation using three towers. I want to conduct a sensitivity analysis on the reflux ratio of the first tower regarding the total energy consumption of the three towers, but I’m not sure what variable this heat represents; the sensitivity analysis can be done, but I’m unsure about how to choose the variable I hope someone experienced can give me some advice! Thank you!
What does the total energy consumption of the three towers mean?
A Fortran program can be inserted into the sensitivity analysis to solve this problem
Reply to 3# laipi*ao*n: I’ve heard of this phrase, but I don’t know how to use it. Anyway, thanks!
Regarding the result curves of the sensitivity analysis. It is recommended that you set TOLERANCE to 0; this will result in a smooth curve. Otherwise, your curve will be very irregular
Reply to 3# laipi*ao*n: My simulation tower uses the Radfrac method; I have the number of trays, the reflux ratio, and the reflux volume, and the results have been obtained through simulation. Now I’m conducting a sensitivity analysis to examine the impact of the reflux ratio of the first column on the energy consumption of the three columns. I will analyze this as well, but it seems like this approach might not be correct. The greater the reflux ratio, the higher the total energy consumption of the three columns will definitely be, as all other conditions remain unchanged. The key question now is how to simulate it? I’m feeling a bit confused right now; could you help me sort things out? Hehe!
It’s a problem; I’ve encountered the same issue with energy consumption analysis
I’m also doing sensitivity analysis and don’t know how to choose the variables. For example, when analyzing the effect of the reflux ratio in a methanol and water distillation column on the mass fraction of water at the bottom of the column, how should I define the variables in define and tabulate?
The relationship between independent and dependent variables, that is, the issue of influencing factors and outcomes
You can try it using the following method: 1. Define Q1, Q2, and Q3 in the ‘define’ section; these values represent the reboiler heat loads of the three towers respectively. 2. Define the range of variation for the reflux ratio in the ‘vary’ section. 3. In Fortran, write Q = Q1 + Q2 + Q3. 4. Add a row in the ‘tabulate’ section, and enter Q in that tabulated variable. Alternatively, after completing steps 1 and 2, you can directly add a row in ‘tabulate’ and enter Q1 + Q2 + Q3 there. If the calculation proceeds successfully and the specified range for variation is appropriate, you should obtain the desired results... I hope this helps you……
Reply to 10# zsuzhujian: Hello! That’s exactly what I did; it is indeed possible to simulate it. If we simulate the three-column separation problem, the first column is used to separate the light and heavy components, with the overhead and bottom products going to separate columns respectively, which is parallel separation. Specify the purity and yield of each component. Now, the operating conditions for the tower need to be designed. How to determine the reflux ratio? What I do is use the Simple Tower method to determine the appropriate number of trays and reflux ratio. Then use a strict tower for verification until the requirements are met. Once all the conditions have been determined, it may be a bit too late to conduct an analysis of the energy consumption of the three towers based on the reflux ratio; certainly, the energy consumption of these three towers increases as the reflux ratio increases. My goal is to conduct a sensitivity analysis while determining the operating conditions, in order to find the reflux ratio that results in the lowest energy consumption for the three towers. How can this be achieved? Please give me some advice! Thank you!