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Latest revision as of 14:24, 10 January 2020
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| 00:01 | Welcome to the spoken tutorial on simulating a Shortcut distillation column in DWSIM. |
| 00:06 | I am Kannan Moudgalya. |
| 00:08 | In this tutorial, we will simulate a Shortcut distillation column. |
| 00:13 | We will learn: to calculate:
Minimum number of stages, Minimum reflux ratio, Optimal Feed stage location, Condenser and reboiler heat duty |
| 00:23 | to achieve a particular product specification. |
| 00:26 | To record this tutorial, I am using DWSIM 3.4. |
| 00:30 | To practice this tutorial, you should know: |
| 00:32 | How to add components to a flowsheet |
| 00:35 | How to select thermodynamic packages |
| 00:37 | How to add material streams and specify their properties. |
| 00:41 | The prerequisite tutorials are mentioned on our website: spoken-tutorial.org. |
| 00:47 | In the next two slides, we give specifications for the distillation problem. |
| 00:55 | This problem statement is given by Prof. Bill Luyben of Lehigh University. |
| 01:00 | I have already opened DWSIM. |
| 01:03 | Click on System of Units menu. |
| 01:07 | Select Custom 1. |
| 01:10 | This allows us to customize units which we will do next. |
| 01:14 | Let us click on Configure Simulation button. |
| 01:18 | Add Benzene from the ChemSep Database. |
| 01:27 | Next Toluene. |
| 01:33 | We will next click Thermodynamics and then Property Packages. |
| 01:40 | Scroll down and select Raoult’s Law. |
| 01:44 | Below the Thermodynamics option, you see Options menu. Click this. |
| 01:49 | Click Units System. |
| 01:53 | Let me bring this inside. |
| 01:56 | Pressure menu appears at the top of this list. |
| 01:58 | Click and choose atm for atmosphere. |
| 02:04 | Below the Pressure menu is the Molar flow rate menu. |
| 02:08 | Click it and select kmol/per hour. |
| 02:13 | Click on Back to simulation. |
| 02:15 | Let us insert a feed stream that has to be distilled. |
| 02:21 | Enter 0.4 for benzene and 0.6 for toluene. |
| 02:29 | Apply and Close. |
| 02:32 | We will change the name of this stream to Feed. |
| 02:39 | Click on Properties. Scroll to the top. |
| 02:43 | Click on Specification. |
| 02:46 | Choose Pressure and Vapor Fraction. |
| 02:50 | Locate the Molar flow rate option. |
| 02:53 | It has the units of kmol/per hour. |
| 02:57 | Click on this field. Enter 100. |
| 03:02 | Locate Molar Fraction (Vapor Phase). |
| 03:08 | The default value is 0. |
| 03:10 | This indicates saturated liquid. |
| 03:13 | Let us leave it as it is. |
| 03:16 | Let us insert a Shortcut column to the flowsheet. |
| 03:20 | Locate it from the Object palette. |
| 03:23 | The Shortcut Column is based on Fenske-Underwood-Gilliland method. |
| 03:27 | Click on it and drag it to the flowsheet. |
| 03:32 | Let us arrange it. |
| 03:34 | Now, let us insert two output streams. |
| 03:37 | One will be distillate, the other is Bottoms. |
| 03:41 | To do that, let us drag two material streams. |
| 03:46 | As they are output streams, we will leave them unspecified. |
| 03:56 | We will change the name of these streams to Distillate and Bottoms. |
| 04:05 | Let us now insert two Energy streams for Condenser duty and Reboiler duty. |
| 04:17 | Name these streams as C-Duty and R-Duty. |
| 04:24 | We are now ready to specify the Shortcut distillation column. |
| 04:27 | Click on it and select it. |
| 04:30 | Go to the Selected Object window. |
| 04:32 | Under theProperties tab, locate Connections menu. |
| 04:37 | The first option is Feed. Let me click on Feed menu. A down arrow appears indicating a menu. |
| 04:44 | Click this arrow. Here we choose Feed. |
| 04:48 | Now, click on the next option which says Distillate. |
| 04:51 | Click on the drop-down arrow and select Distillate. |
| 04:56 | Similarly, for Bottoms, choose Bottoms. |
| 04:59 | The next option is Condenser Duty. |
| 05:02 | Let me click on it and select C-Duty. |
| 05:07 | Similarly, choose R-Duty for Reboiler. |
| 05:12 | This completes the connectivity of the flowsheet. |
| 05:14 | Under Properties tab, locate Parameters section. |
| 05:19 | This section is used to specify various attributes of a Shortcut Column. |
| 05:25 | In this section, the first option is Condenser. |
| 05:30 | By default, it is Total Condenser. |
| 05:33 | If a partial condenser is required, you can change it here. |
| 05:36 | Here, we leave it as it is. |
| 05:39 | Let us enter the Reflux Ratio. Click on it. |
| 05:42 | Here, we enter the value 2 in the field next to it. |
| 05:49 | We will specify the Product composition. |
| 05:52 | Let us first specify light key details in bottoms. |
| 05:57 | To do this, let me click light key. |
| 06:01 | Click the arrow and choose Benzene. |
| 06:04 | In the given field, on the next row, enter 0.05. |
| 06:10 | Similarly, for heavy key, choose Toluene. |
| 06:15 | Now we specify the heavy key in Distillate. |
| 06:18 | We enter 0.05. |
| 06:23 | Next in the list is Condenser Pressure. |
| 06:26 | The default value is 0 atmosphere. We will change it to 1 atmosphere. |
| 06:32 | Similarly, let us change reboiler pressure to 1 atmosphere. |
| 06:37 | Now we will run the simulation. |
| 06:39 | To do this, go to the Calculator options. |
| 06:42 | Click on the Play button. Now, click on the Recalculate button. |
| 06:47 | When the calculations are completed, click on the Shortcut column. |
| 06:53 | Under Properties tab, locate Results menu. |
| 06:58 | This shows all the required results like: |
| 07:00 | Minimum Reflux Ratio |
| 07:03 | Minimum Number of Stages |
| 07:05 | Actual Number of Stages |
| 07:07 | Optimal Feed Stage etc. |
| 07:10 | I have tabulated these results in a slide. |
| 07:15 | Let me save this simulation. |
| 07:20 | I have saved this as shortcut end. |
| 07:24 | Let me summarize. |
| 07:26 | We learnt: * how to specify a shortcut distillation column |
| 07:29 | To specify key components, purities and minimum reflux ratio |
| 07:34 | To use custom units |
| 07:36 | To calculate- minimum reflux ratio, optimal feed location and total number of trays. |
| 07:43 | Let me give some assignments.The assignment in this slide has to do with mass balances. |
| 07:48 | I use blue colour to indicate streams and equipment. |
| 07:52 | Let us go to the next assignment. |
| 07:54 | Carry out energy balance as mentioned. |
| 07:58 | Repeat the simulation with different product purities. |
| 08:02 | Determine how the energy requirement changes. |
| 08:06 | Repeat this simulation with different thermodynamics. |
| 08:08 | Repeat this simulation with different feed conditions. |
| 08:12 | Try to reason your results.We have come to the end of this tutorial. |
| 08:16 | This video summarizes the Spoken Tutorial project. |
| 08:20 | If you do not have good bandwidth, you may download and watch it. |
| 08:24 | We conduct workshops using Spoken Tutorials; give certificates. Please contact us. |
| 08:31 | Do you have questions in this Spoken Tutorial? |
| 08:33 | Choose the minute and second where you have the question. |
| 08:37 | Explain your question briefly.Someone from the FOSSEE team will answer them. |
| 08:41 | Please visit this site. |
| 08:44 | The FOSSEE team coordinates coding of solved examples of popular books. |
| 08:48 | We give honorarium and certificates to those who do this. |
| 08:52 | For more details, please visit this site. |
| 08:56 | The FOSSEE team helps migrate commercial simulator labs to DWSIM. |
| 09:00 | We give honorarium and certificates to those who do this. |
| 09:04 | For more details, please visit this site. |
| 09:07 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 09:14 | Thanks for joining. Good bye. |
