CHBE 376 Computer Flowsheet and Fluid Properties Estimation

2-ASPEN PLUS Basics

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Start Aspen Plus All Program AspenTech Process Modeling V7.3 Aspen Plus Aspen Plus user interface Select OK - Aspen Plus Startup Select OK - Connect to Engine

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Path

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Aspen Plus Main Windows

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Process Flowsheet Window Unit Operation Model Library

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Open a Aspen Plus Simulation File

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Open: Flash.bkp Path: Program Files AspenTech Aspen Plus V7.3 Favorites - Example >GSG_Process >Flash.bkp Save in your removable disk (USB flash drive)

Process: Flash separation of methanol-water. Rename the Separator and Streams Shortcut menu: select the stream (or block) and click the right mouse button

Input the feed and operating conditions Save & Examine the results

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Flash Model

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Feed: T = 180 F P = 20 psi Methanol = 50 lbmol/hr Water = 50 lbmol/hr

NOTEModel Library closed for more space

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Opening Input Sheets

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Data Data Browser: Streams - Feed

FEED

Red indicates incomplete

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Input FEED Stream

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NEXT BLUE

Blue: Input complete

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The NEXT Function [N]

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Expert Guidance Guides you to the next step of entering the inputs. Display messages of what to do next Ensure that you enter complete and consistent specifications

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N

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FLASH Input

Required Input Incomplete

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N

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FLASH Input

Required Input Complete

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Status Indicators

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Color and shapes are used to describe the current status of inout and results

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Running the SimulationCheck for Results

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From the Run Menu: Select Run

No Error

Results Available

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Results Summary Run Status

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Select Streams

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Stream Results

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Select Streams

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Block Results

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Modifying and Running the Model>>> Reinitialize - Run

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>>> Change the feed conditions

Input changed

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New Results

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Add to PDF

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Process Flowsheet with Stream Table

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Setup Specifications

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Flash.bkp file was prefilled with Setup, Components and Properties Specifications

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Components Specifications

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Properties Specifications

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NRTL model for calculation of activity coefficients

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Property Analysis to understand the physical property and phase equilibrium behavior of the fluid in your process, and to confirm that the behavior predicted by the property method and data you are using is reasonable.

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It is important in a simulation study:

Examine the T-xy and P-xy diagrams Methanol and Water system NRTL activity coefficient model

Tool menu Analysis Property - Binary

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Property Analysis

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Tool menu Analysis Property - Binary

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Property Analysis

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Select Type Click to plot

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Txy Plot

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Pxy Plot

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Help

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Help Topics Select Help Topics from the Help menu to launch online help: Contents: Browse through the documentation, including User Guides and Reference Manuals Index: Search for help on a specific topic using the index entries Search: Search for a help on a topic that includes any word or words

Whats This ? Help Click the Whats This ? toolbar button and then click any area to get help for the item

F1 Help With the cursor in the desired field, press the function key to bring up help for field and/or sheet

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Save the File: Tools - Options General Select to save *.apw and *.bkp

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Save Options Aspen Plus Document File: *.apw Document files contain all the intermediate convergence information form the simulation, Useful for saving long simulation, Is not forward compatible for new versions of Aspen Plus

Aspen Plus backup file: *.bkp Is compact, portable and forward compatible, Contains only the input specifications and simulation results, First run of *.bkp file will take just as long as the very first run of the simulation

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Other Useful Files Text file saved with *apw Detailed calculation history and diagnostic messages

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History File: *.his

Excel Workbook: *.apmbd Excel File Microsoft Excel embedded with an Aspen Plus simulation

Other files saved with *.apw *.appdf *.def *.for

Notes

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