DWSIM/C2/Rigorous-Distillation/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this tutorial on Simulating a Rigorous Distillation column in DWSIM. |
| 00:07 | In this tutorial, we will learn to: |
| 00:10 | Simulate a Rigorous Distillation column |
| 00:13 | Specify column Pressure Profile |
| 00:16 | Specify Tray Efficiencies |
| 00:19 | Check desired product compositions and |
| 00:22 | View the Column profiles |
| 00:25 | This tutorial is recorded using
DWSIM 5. 8 (Classic UI) Update 3 and Windows 10 OS. |
| 00:36 | But, this process is identical in Linux, Mac OS X or FOSSEE OS on ARM. |
| 00:44 | To practise this tutorial, you should know to-
Add components to a flowsheet |
| 00:50 | Select thermodynamic packages |
| 00:53 | Add material and energy streams and specify their properties. |
| 00:58 | The prerequisite tutorials are available on this website. |
| 01:03 | You can access these tutorials and all the associated files from this site. |
| 01:09 | shortcut-end file used in the tutorial is provided as a Code file on this tutorial page. |
| 01:17 | Download the files from Code Files link. |
| 01:21 | I have already opened DWSIM on my machine. |
| 01:26 | I have opened the file shortcut-end.dwxmz. |
| 01:32 | Let me save this as rigorous. |
| 01:37 | We can see that the file name has changed now to rigorous. |
| 01:42 | Click on the Settings button on the toolbar. |
| 01:46 | Click on Systems of Units tab. |
| 01:49 | Locate Pressure menu on the right hand column. |
| 01:53 | Click and choose atm for atmosphere.
Press Enter. |
| 01:59 | Similarly, change the units of Delta_P to atm.
Press Enter. |
| 02:06 | Close the Settings window. |
| 02:09 | Let me switch to the slides. |
| 02:12 | This problem was solved in the spoken tutorial on Shortcut Distillation. |
| 02:18 | These values form the basis for the rigorous distillation column problem. |
| 02:24 | This represents the solution of the given problem using Shortcut Distillation. |
| 02:30 | We will be using these values shortly. |
| 02:33 | Let us begin by replacing the Shortcut column with a Rigorous column. |
| 02:38 | Let me go back to the simulation. |
| 02:41 | Right-click on the Shortcut column, and select delete.
Click Yes in the prompt box. |
| 02:49 | At the bottom of the main simulation window, go to Columns tab. |
| 02:54 | From the displayed list, drag and drop a Distillation Column to the Flowsheet. |
| 02:59 | Let’s us now arrange it as required. |
| 03:02 | Click on the Distillation Column. |
| 03:05 | On the left, go to the Property Editor Window of the Distillation Column. |
| 03:10 | Now under Column Specs, click on the General tab. |
| 03:15 | Locate the Number of Stages option. |
| 03:18 | We have to enter the total number of trays here. |
| 03:22 | We got the equilibrium stages to be 20 from the shortcut method. |
| 03:27 | We can see it in the slide.
Let us go back to DWSIM. |
| 03:33 | This number should be one more than the equilibrium stages given by shortcut method. |
| 03:39 | So, change the Number of Stages to 21 and press Enter. |
| 03:46 | This number includes the condenser also in DWSIM. |
| 03:51 | So here we will use a total condenser. |
| 03:56 | Now we will select the solution method. |
| 03:59 | Click on the drop-down against Solver. |
| 04:03 | Choose the Solver as Wang-Henke (Bubble Point), if not already selected. |
| 04:09 | By default, Wang-Henke (Bubble Point) is already selected as Solver. |
| 04:15 | Now we will connect the streams to the Distillation column. |
| 04:20 | Go to Column Configuration section. |
| 04:23 | Navigate to Connections >> Streams Connections >> Feeds |
| 04:29 | Here we have to specify the stream which is entered as a feed to the column. |
| 04:35 | Here, we can see the list of Feed Ports. |
| 04:39 | Select any port where we want the feed to enter the Distillation column. |
| 04:44 | For a better look, we select Column Feed Port 5. |
| 04:48 | Click on the down-down against Column Feed Port 5. |
| 04:53 | Select Feed and press Enter. |
| 04:56 | In a similar way, we will connect the product streams. |
| 05:00 | Now, click on the Products tab. |
| 05:03 | Select Distillate as Distillate and press Enter. |
| 05:08 | Select Bottoms as Bottoms and press Enter. |
| 05:13 | Now we will connect heat duties to reboiler and condenser. |
| 05:18 | Click on the Duties tab. |
| 05:20 | Select Reboiler Duty as R-Duty and press Enter. |
| 05:25 | Select Condenser Duty as C-Duty and press Enter. |
| 05:31 | Now under Connections, click on Stream-Stage Associations tab. |
| 05:37 | For Feed Port type, select Stage location as Stage9.
Press Enter. |
| 05:44 | This is as per the solution we got in the Shortcut Distillation column. |
| 05:49 | We got the Optimal Feed Location to be 9 from the Shortcut method. |
| 05:54 | We can see it in the slide.
Let us go back to DWSIM. |
| 06:00 | This completes the connections. |
| 06:03 | Now we have to provide the top and bottom specifications. |
| 06:08 | Under Properties tab, locate the section Column Specs. |
| 06:13 | Click on the Condenser tab. |
| 06:16 | Select Condenser Type as Total, if not already selected. |
| 06:21 | By default, it is total condenser.
We will leave it as it is. |
| 06:25 | Change Condenser Pressure to 1 atmosphere and press Enter. |
| 06:32 | Select Condenser Pressure drop as 0.
By default, it is 0. We will leave it as it is. |
| 06:40 | Next select the Specification as Reflux Ratio, if not already selected. |
| 06:47 | By default, Reflux Ratio is already selected as Specification. |
| 06:53 | Under Compound, we can see a field. |
| 06:56 | Here we can enter the value of reflux ratio. |
| 07:00 | We will enter the Reflux Ratio as 2.317.
Press Enter. |
| 07:06 | Now click on Reboiler tab. |
| 07:10 | Change Reboiler Pressure to 1.1 atmosphere and press Enter. |
| 07:16 | Select Specification as Product Molar Flow, if not already selected. |
| 07:22 | Under Compound, change the units to kilomol per hour and press Enter. |
| 07:29 | Now enter the Molar flow rate as 60.204.
Press Enter. |
| 07:36 | This is suggested by the shortcut solution.
We can see it in the slide. |
| 07:43 | Let us go back to DWSIM. |
| 07:46 | Now we will also see how to specify the pressure for the intermediate stages. |
| 07:53 | Now go to Column Configuration section. |
| 07:56 | Click on Stages tab. |
| 07:59 | It shows the condenser and reboiler pressures as 1 and 1.1 atmosphere. |
| 08:06 | New stages that have been added, are assigned zero pressure, which is incorrect. |
| 08:12 | We would like the intermediate stage pressures to take the interpolated values. |
| 08:18 | Under Column Configuration section, go to the extreme left. |
| 08:23 | Here we can see 5 different icons.
Hover the mouse to the last icon. |
| 08:30 | A popup is displayed as Estimate Stage Pressures by Interpolation.
Click on the icon. |
| 08:38 | Immediately, linearly interpolated values are assigned to every stage. |
| 08:44 | We can also edit the pressure of the individual stages, if they are known. |
| 08:50 | We may also change the efficiency in one or more stages. |
| 08:55 | Now we will run the simulation. |
| 08:58 | Click on Solve Flowsheet button on the toolbar. |
| 09:02 | When the calculations are completed, click on the Distillation column. |
| 09:07 | Go to the Property Editor Window of the Distillation Column. |
| 09:12 | Locate the Results section. |
| 09:15 | This shows all the required results like
Condenser Duty , Reboiler Duty and Column Profiles |
| 09:23 | Now let us look at the Column profiles. |
| 09:27 | Click on View Temperature, Pressure and Composition Profiles button. |
| 09:33 | Now we can see a pop-up window. |
| 09:37 | Here, we can see the- Temperature profiles, Flows profiles, Component flows and Component fractions |
| 09:50 | For the exact numbers, click on the Table tab to the right of the Graph tab. |
| 09:56 | Now save this file. |
| 09:59 | Let us summarize |
| 10:03 | In this tutorial, we have learnt to:
Simulate a Rigorous Distillation column, Specify column Pressure Profile |
| 10:11 | Specify Tray Efficiencies, Check desired product compositions and View the Column profiles |
| 10:20 | Take the Assignment from the Shortcut Distillation column. |
| 10:24 | Perform the simulation using Rigorous Distillation. |
| 10:28 | Here is the assignment problem statement of the Shortcut Column. |
| 10:33 | With this, we have come to the end of this tutorial. |
| 10:37 | Watch the video available at the following link.
It summarizes the Spoken Tutorial project. |
| 10:45 | The Spoken Tutorial Project Team, Conducts workshops and Gives certificates. |
| 10:51 | For more details, please write to us. |
| 10:54 | Please post your time queries in this forum. |
| 10:58 | The FOSSEE team coordinates conversion of existing flowsheets into DWSIM. |
| 11:04 | We give honorarium and certificates for those who do this.
For more details, please visit this site. |
| 11:13 | The FOSSEE team helps migrate commercial simulator labs to DWSIM. |
| 11:19 | We give honorarium and certificates for those who do this.
For more details, please visit this site |
| 11:28 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 11:37 | This tutorial was originally recorded by Prof Kannan Moudgalya in September 2015.
This is Kaushik Datta from IIT Bombay. Thanks for joining. |
