To start either of these packages, be sure to look for the corresponding User Interface on the start menu. This document is intended to be an overview. ASPEN has extensive online help.
Generally, pressing F1 on an input form will provide the appropriate help screen to check units or relate the parameter names to parameters names used in literature. They do not respond to student requests. Work through your instructor and TA for getting answers to your questions.
Most common tasks are covered. The screenshots in this tutorial and some of the menus are outdated. However the major steps of working with Aspen are similar to what is depicted below. To start either of these packages, be sure to look for the corresponding start menu item. If you encounter an error on startup using one of the engineering remote desktops, take note of the server name on the desktop and call DECS to inform them of the detailed error message and the server name.
To demonstrate how to build a process simulation using ASPEN, we will develop a distillation column for separation of ethanol and water. The first step in developing a simulation is to develop the process flow diagram PFD , which consists of the unit operations blocks and streams that feed and connect the blocks.
The blocks are listed by category at the bottom of the main window columns, reactors, etc. There are a wide variety of block available. The first step is to choose the column type for the ethanol-water separation. Click on columns to view the different column simulations available. The two types of common interest are 'DSTWU', which is the multicomponent shortcut distillation method, and 'RadFrac', which is the rigorous simulation of a single column.
Choose 'RadFrac'. Click on the small arrow on the right side of 'RadFrac' to select the column icon that you want to use on the PFD. The menu will disappear; move the crosshairs to the desired location on the main flowsheet window and click the mouse button.
Next you have to add streams to the block. For this example, set up the feed stream: choose the Material stream by clicking on it. The column will now show arrows where the stream can be connected; red arrows indicate required streams as shown in Figure 3. To set up the feed stream to the column, move the crosshair on top of the red feed position and left click once.
Now, move the mouse to the left and click again. You should now have a defined feed stream Stream 1. For the outlet streams click the column outlet first to connect the bottoms Stream 2 and liquid distillate Stream 3.
If you make a mistake and want to delete a stream or block, click on the arrow select button at the upper left of the Model Library toolbar, then click on the stream or block you want to delete and hit the DELETE key. Now that you have defined the unit operations to be simulated and set up the streams into and out of the process, you must enter the rest of the information required to complete the simulation. Any option will open the Data Browser.
In the Data Browser, you are required to enter information at locations where there are red semicircles. When you have finished a section, a blue checkmark will appear. However, providing some 'Setup' settings is often desirable. You can browse the unit sets to see the choices. The base 'unit-set' names shown above are reserved names and you cannot modify them. Once you have viewed the units you can specify the choice by using the drop down boxes.
If you are running Aspen Plus, you may wish to have stream results summarized with mole fractions or some other basis that is not set by default. Use the 'Report Options' as shown below. Here you have to enter all the components you are using in the simulation. The opening screen is shown below.
The easiest way to enter component information is to click on the 'Find' button and enter the name of the component. Click the 'Add' button to add it to the components list. Repeat to add water to the components list. If you make a mistake adding a component, right click on the row to specify deletion.
You need to be aware of the manner in which Aspen implements parameter values because Aspen offers temperature-dependent functions in place of parameters, and sometimes uses different signs on parameters than the same models in the literature. See the instructions in section 1. However to access the van Laar model, you must select 'all'.
Note that some models have options to select a second set of parameters for some process units. This is the same model but permits setting up two different sets of parameters that can be used in different parts of the simulation.
For example, a distillation and flash calculations for most streams may be better represented by parameters fitted to VLE and a liquid-liquid extractor may be best represented by parameters fitted to LLE. Here we set the default method to be used for the overall process. When you close the window or click 'Next', you have provided approval of the values, and you will receive no further prompting for parameter values. If parameters are blank, zeros will be used. This does not imply that the ideal mixture assumption will be used because many models predict non-ideal behavior with parameter values of zero.
The newer input form uses rows instead of columns, but the information is the same. Note that the 'Source' cell in the table is a dropdown menu. When clicking in that cell, the user can select different sets of parameters. Those parameters will be used whenever the model is used.
The form of the thermodynamic model parameters usually differs from the form in the published literature because ASPEN often replaces parameters with functions of temperature. To find the form of equation used in Aspen, open the Help file, and from the 'index' tab, search for the index for the model name e. You should then see equations very similar to the published literature.
To understand where you are within the help file system, switch back to the Contents tab of the help folder and you will see links to the other activity coefficient methods. To verify the pure component values e. Then in the right pane on the 'selection' tab, click the 'Review' button at the bottom right.
These should match the values from the course textbooks. Click on 'Next'. Stream specifications will appear. You must choose the stream composition, flow rate, and state for feed streams. The state is specified by pressure, temperature, and vapor fraction.
For this example, for the feed stream 1 choose a pressure of 1 atm and a temperature of 25 o C. If you enter feed composition as mole fractions, you also have to specify the total flow rate. Click on Next. The block RadFrac setup will appear. For this rigorous simulation, you must specify the column configuration. Enter the number of stages as 33 and specify total condenser. Note that in the newer versions of Aspen, a menu item for 'Block Options' will appear the the left browser panel.
Selecting that will bring up a form where the thermodynamic property model can be specified to override the default. Hit 'Next' and the 'Stream' page appears.
Locate the feed stream 1 on stage Hit 'Next' to get to the 'Pressure' page. By leaving the other sections of the pressure page alone, pressure drop through the column will be ignored in this calculation. All required information should now be complete. Click 'Next'. You should now get a message that all required information has been entered. If you don't, complete the required form or look at the menu on the left for any red semicircles.
To run the simulation, click OK on the message, or you can run the simulation on Run in the 'Run' pulldown menu. To view results, click on the blue folder in the toolbar. Choose 'Stream' to view stream properties, or 'Block' to view column properties. In 'Streams', you can look at the streams you wish and place a streams table on your PFD by clicking the 'Stream Table' button. Note: pasted stream tables are NOT updated if you modify the simulation and rerun. In a complex simulation, it is sometime more convenient to work with the PFD to find results.
Right-click on a block or stream for a short-cut menu to results. You can bring up compiled reports by going to the 'View' menu and clicking on the desired information.
The information in the reports is controlled somewhat by the report options introduced in Section 4. You can study the behavior of the column by looking at the column profiles as shown below from the 'Results' data browser. An example table is shown below. For compositions, choose the composition tool, specify liquid mole fractions. The analysis below shows that there may be more stripping stages than necessary for the given column 33 stages, flowrates, reflux and boilup. Naturally, compositions at the top of the column are limited by the azeotrope.
You can print the process flowchart and include the stream table if you have pasted it onto the PDF. If you cannot find the answer to your question in the manuals, you should For oil, gas and petrochemical applications, the Peng-Robinson EOS PR is generally the recommended property package. Contains all information relating to the available. It does craft FTP issues and Transmit Use techniques from How amplio in established location insurance and expropriated software partition.
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