4460 Aspen Notes 2011

4460 Aspen Notes 2011 - Chemical Engineering Department...

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Chemical Engineering Department Auburn University CHEN 4460 Mario Richard Eden INTRODUCTION TO ASPEN PLUS SIMULATION What is Process Simulation/Analysis? The purpose of analysis/simulation is to model and predict the performance of a process. It involves the decomposition of the process into its constituent elements (e.g. units) for individual study of performance. The process characteristics (e.g. flowrates, compositions, temperatures, pressures, properties, equipment sizes, etc.) are predicted using analysis techniques. These techniques include mathematical models, empirical correlations and computer-aided process simulation tools (e.g. ASPEN Plus ). In addition, process analysis may involve the use of experimental means to predict and validate performance. Therefore, in process simulation, we are given the process inputs and flowsheet and are required to predict process outputs (Fig. 1). The lab will focus on ASPEN Plus. It is a computer-aided software which uses the underlying physical relationships (e.g., material and energy balances, thermodynamic equilibrium, rate equations) to predict process performance (e.g., stream properties, operating conditions, and equipment sizes. Process Structure and Parameters (Given) Process Inputs (Given) Process Outputs (Unknown) Fig. 1. Process Simulation Problems There are several advantages of computer-aided simulation: Allows the designer to quickly test the performance of synthesized process flowsheets and provide feedback to the process synthesis activities. Can be coordinated with process synthesis to develop optimum integrated designs. Minimizes experimental and scale-up efforts. Explores process flexibility and sensitivity by answering "what-if" questions. Quantitatively models the process and sheds insights on process performance. Important issues to remember before venturing into the exciting world of computer-aided simulation: Do NOT implicitly trust the results of ANY simulation tool. The calculated results are only as good as the input YOU give the simulator. ALWAYS convince yourself that the obtained results make physical sense, otherwise you will NEVER be able to convince someone else of the merits of your work. Introduction 1 of 11
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Basic Information on ASPEN PLUS and Its Graphical Operations I. How Do I Start It? From the Windows Start menu, select Programs then ASPEN Tech, then ASPEN Engineering Suite, then ASPEN Plus 12.1, then ASPEN Plus user interface (Fig. 2). Fig. 2. Starting ASPEN Plus Next, you will have the option of opening an existing file, using an existing template or starting a blank simulation. Choose a blank simulation (Fig. 3). Fig. 3. Starting a Simulation Introduction 2 of 11
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ASPEN Plus will display the User Interface (Fig. 4). Features of the User Interface: Menus: are used to specify program options and commands Toolbar allows direct access to commonly-used functions Data Browser: is used to navigate folders, forms, and sheets.
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This note was uploaded on 12/05/2011 for the course CHEM 4460 taught by Professor Eden during the Fall '11 term at Auburn University.

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4460 Aspen Notes 2011 - Chemical Engineering Department...

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