00:00As discussed earlier, before starting the simulation, make sure that DWSIM software is installed on your computer.
00:09Step 1. Open DWSIM. From the desktop, select Start and then select Programmed.
00:16Next, select DWSIM folder and then DWSIM. DWSIM welcome window appears as shown here.
00:23Step 2. Complete Simulation Configuration Wizard.
00:27As discussed earlier, a new simulation is started by initializing the Simulation Configuration Wizard by either clicking on the New Chemical Process Model under the File menu or by clicking the New Steady State Simulation button on the button strip or by clicking the link Create New Under Process Modeling scene on the welcome screen.
00:49An introduction window will open as shown. Click the Next button to get the Compounds page.
00:53Start adding the Components. Make sure that the Components added are Ethane, Propane, Isobutane, Denbutane.
01:02Click Next to get to the Property Package Sheet.
01:06Select at least one property involved and click Add button.
01:10Peng Robinson is the recommended package for this problem. Click the Next button to get to the System of Units page.
01:16Select the Units according to the Problem Statement one after another for all the properties given in the problem.
01:22For other properties, just leave it as it is.
01:25Click Next to get to the Behavior page.
01:28Then click on Activate Smart Object Solving and then click the Finish button.
01:34This completes the Simulation Configuration and now it is ready to construct the Flowsheet.
01:38Step 3. Draw the Flowsheet.
01:42On the Main Flowsheet window, a Flowsheet can be drawn by using the Process Equipment Models available.
01:47From the Object Palette that appears at the bottom of the Main Flowsheet window, choose Pressure Changer, then click Compressor to select it.
01:56Drag and drop the compressor and double click on the objects and edit the names.
02:00Since Smart Object Solving is already selected, it will automatically add all the necessary feed, product and energy streams associated with it,
02:10but with the default name for the object and numbers for the streams.
02:14Similarly, add the second unit operation, which is Cooler, from the object palette by choosing Heat Exchanger and then selecting the Cooler.
02:22Automatically, the outlet stream from the compressor is connected to the input of the Cooler.
02:27Next, add the third unit operation, that is the separator from the object palette by choosing Separator slash Tanks and then selecting the Gas-Liquid separator.
02:39Automatically, the outlet stream from the Cooler is connected to the input of the separator.
02:44Here, the streams are renamed as Feed, Compressed Feed, Cooled Feed, Vapor, Liquid, Compressor Duty, Cooler Duty, and the block as Compressor, Cooler, and Separator respectively.
03:02The sequential operations are shown here.
03:05Step 4 is to provide stream information.
03:08Just double click on the feed stream to edit and enter all the properties from the problem statement.
03:13Note that there are two steps, namely stream conditions and compound amounts.
03:18The basis and the units must be checked thoroughly.
03:21Since the feed is a gaseous mixture, the vapor fraction by default is 1.
03:26Only temperature and pressure are available for the feed.
03:29Hence, class calculation type can be chosen as Temperature and Pressure, TP.
03:33Here, the stream conditions and composites are entered as given in the problem statement.
03:40After entering the values in each field, press Enter key to save the values.
03:45Step 5.
03:46Configure the block.
03:48Double click on the blocks and enter all the information as given here.
03:51First, for the compressor, select the calculation type as outlet pressure.
03:58Enter outlet pressure as 50 psi and adiabatic efficiency as the default value, that is 75%.
04:04Next, for the cooler, select the calculation type as outlet temperature.
04:10Enter pressure drop as 0, efficiency as the default value, that is 100%,
04:15and outlet temperature as 32 degree Fahrenheit, to be consistent with the problem statement.
04:22The final step is to run the simulation and review the result.
04:26Once entering all the values, the message will automatically appear as
04:30the flow sheet was calculated successfully, which is displayed at the bottom of the screenshot.
04:36Since all the necessary information is completely provided in this case,
04:40the flow sheet is automatically calculated.
04:41Otherwise, the simulation can be run by clicking the Solve button, which will trigger an error message.
04:49On rectifying these errors, the flow sheet will be calculated successfully.
04:54As we had already discussed on how reports are generated,
04:58the results are tabulated using the Insert Table option from the Insert menu.
05:03Upon double clicking the button generated, we have to choose the properties to display in the table.
05:08For the property table, the object COMPDUTY is selected and the corresponding property ENERGY FLOW is also selected.
05:17Similarly, the object COOLER DUTY is selected and the corresponding property ENERGY FLOW is also selected.
05:24And then, the object COOLED FEED is selected and corresponding properties such as MOLAR FLOR RATE,
05:31WAPER PACE and LIQUID PACE MOLAR FRACTIONS are also selected.
05:34For the master property table, the object separator is chosen and the properties to be tabulated are
05:42temperature, pressure, mass and molar flow rates, mole fractions of ethane, propane, isobutane and N-butane.
05:49These properties to be determined as per the problem statement are shown here.
05:54These tables and process flow diagram can be moved by dragging or resizing by zooming in and out as per our need.
06:01Here, the PFD and master property tables are neatly arranged as shown here.
06:06The summary of the result page is shown in the form of a property table and master property table.
06:12The results can also be accessed through the result tab of the data editor of the particular object.
06:18The simulation work can be saved and results can be exported if required.
06:21The flow sheet or the result table or any other graphics can be copied so that they can be pastured into any Microsoft Office applications as usual.
06:31If needed, any of the input data can be modified to rerun the simulation.
06:36With this, we have completed the simulation on separation process.
06:40Hope this knowledge will help you in exploring further to solve similar problems.
06:44Let us summarize what we have learned.
06:47We have discussed the steps involved in simulating a separation process using DWCM software.
06:53By this, we have come to the end of this topic.
06:56Let us meet in another interesting session.
06:59Thank you, learners.
