Hello everyone. i want to seek a suggestion regarding simulated results on any research topic. Most of the work on Distillation columns have been carried out using simulated softwares like Aspen Plus, Aspen Hysys etc. there is lack of Experimental data on these topics. how can anyone validate his/her results.
You may consult spray drying simulation (you wrote any research topic) with experimental validation in the following papers,
Palencia, C. Nava, J., Herman, E., Rodríguez-Jimenes, G.C., García-Alvarado, M.A. (2002). Spray drying dynamic modeling with a mechanistic model. Drying Technology, 20 (3), 569 –586.
Luna-Solano, G., Salgado-Cervantes, M.A., Rodríguez-Jimenes, G.C., García-Alvarado, M.A. (2005). Optimization of brewer's yeast spray drying process. Journal of Food Engineering, 68 (1), 9-18.
In this papers the dynamic simulator was built instead of to be obtained from ASPEN or any other commercial software.
@Miguel Angel García-Alvarado Sir. Thanks for your response. Sir,can you please let me know about Spray Drying Simulations? I am working on Pressure swing distillation, Extractive distillation and Azeotropic Distillations mainly.
Hello Asma, How did you build your simulation without any data? Did you vary the number of theoretical stages to achieve the desired separations. Do you have the resources to develop supporting data in your lab? If not you will have to assume a tray efficiency based on similar commercial processes .If it is a first if its kind commercial unit build I would build it with an assumed tray efficiency around 60%. But you probably need to demonstrate the process on a pilot plant scale first.
You should probably check if the software you are using accurately models published azeotropic data for your system by comparing the published data with your results.
@Rick Manner Sir. Thanks for your comment. Sir, i am optimizing the purity and recovery of products by varying no. of stages, RR, D/F ratio etc. there are few resources from where i get the Experimental VLE data for a specific mixture which i use to compare with my own model. but for validation of simulated results, i didn't find any experimental work regarding distillation.
@G. Modla sir. Thanks a lot for your valuable comment. i am mainly facing this problem when i submit my work for publication purposes. the first comment i got from any journal is regarding validation. Can you please suggest me a way to handle this issue.
Asma, the best way that I can let you to know on spray drying simulators building is with my papers, and therefore I need that you request any one of these papers.
@Miguel Angel García-Alvarado Sir, i am not working on Drying process. I need Experimental data if it is available for azeotropic separations of Azeotropic mixtures using Pressure Swing Distillation, Extractive Distillation, Azeotropic Distillation. etc.
It is impossible to verify the results of solving equations, more or less complex, without experimental research. If someone dared to say otherwise, it means that he/she is living in a world of delusion. However, it is obvious that solving a properly formulated mathematical model can support and accelerate process design.
One way to validate a program like HYSYS is to generate a simple table or graph of properties which can be literature checked. For example, if you are doing a distillation, you should create Txy plots of the key binary pairs of components at a couple of pressures encompassing the proposed systems. Another tool is the phase diagram. Other than having a laboratory this is all you can reasonably do. These exercises should always precede the main work.
May I suggest carrying out a thermodynamic (energy) analysis of the mass transfer operation-Distillation via calculating the heat input for separation process (reboiler duty if i remember) and the enthalpies of the light and heavy products exiting the top and bottom trays-mass balance is possible from McCabe Thiele plots if i also remember correctly and then calculate the thermal efficiency; which is sum of liquid and condensed vapor enthalpies divided by the total heat input-reboiler duty. You can then compare this calculated thermal efficiency with the thermal efficiency ascertained using the results of Aspen Hysys simulation. This should provide evidence of accuracy or inaccuracy of the simulation results
There are further analysis that can be carried out but this should be attempted. No need to introduce additional complexities
Some values can be determined on the basis of thermodynamic considerations, as well as one can use criterial equations. One can also use Aspen's extensive databases of physico-chemical properties. However, fields/profiles of velocities. temperatures, pressures, concentrations etc. must be measured in order to be able to compare them with the obtained fields/profiles from the solution of the equations.
Via thermodynamic analysis, concentration profiles can be determined based on Gibb's free energy minimisation or equilibrium (stoichiometric) balances at specified conditions (temperature, pressures)
Engineering analysis of thermal/chemical reacting/non-reacting systems can result in values for metrics such as thermal efficiency, chemical efficiency and so on, that can also be calculated from the simulation results and compared
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