ASPEN PLUS Chao Miao 04.25.2013. I NTRODUCTION In industry complicated problems are often not...
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Transcript of ASPEN PLUS Chao Miao 04.25.2013. I NTRODUCTION In industry complicated problems are often not...
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ASPEN PLUSChao Miao
04.25.2013
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INTRODUCTION In industry complicated problems are often not
solved by hand for two reasons: Human error and time constraints.
Aspen can be a very powerful tool for a Chemical Engineer in a variety of fields
oil and gas production, refining, chemical processing, environmental studies, power generation
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INTRODUCTION
Aspen Tech was born out a joint research project between the MIT and DOE—an Advanced System for Process Engineering (ASPEN) Project.
Aspen Plus is a process modeling tool for conceptual design, optimization, and performance monitoring for chemical processes. Aspen Plus is a core element of AspenTech’s Process Engineering applications.
Some other tools offered by Aspen One: Dynamic Simulation, Heat exchanger design, Production planning, interface with Microsoft excel (Workbook).
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INTRODUCTION A process model can be defined as an engineering system's "blue print.” The process model is a complete layout of the engineering system
including the following:
1. Flowsheet The flowsheet shows one or more inlet streams entering into the system
and continues through the process, illustrating all intermediate unit operations and the interconnecting streams.
The flowsheet also indicates all product streams. Each stream and unit operation is labeled and identified.
2. Chemical Componentsall chemical components from the necessary reactants and products, to steam and cooling water.
3. Operating ConditionsAll unit operations in the process model are kept under particular operating conditions (i.e., temperature, pressure, size).
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THE STRUCTURE OF A PROCESS SIMULATOR
Component Database
Thermodynamic Model Solver
Flowsheet Builder
Unit Operation Block Solver
Data Output Generator
Flowsheet Solver
Basic Computational Elements in Process Simulator
Select Chemical Components
Select Thermodynamic
Model
Input Topology of Flowsheet
Select Units and Select Feed
stream properties
Select Equipment Parameters
Select Output Display Options
Sequence of Input Steps for a Simulation Problem
Select Convergence
Criteria and Run Simulation
Turton, Bailie, Whiting, Shaeiwitz, “Analysis, Synthesis, and Design of Chemical Processes”, Second Edition, 2003
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INTRODUCTION
To solve this problem, we need:Material balancesEnergy balances
What is the composition of stream PRODUCT?
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GETTING STARTED
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GETTING STARTED
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ASPEN ACCESS
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NAVIGATING THE ASPEN WINDOWS
Toolbar Feature
Equipment Model Library
Stream Library
Status Bar Simulation Status
Next Button
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STATUS INDICATOR
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SET UPMost of the commonly used Setup information is entered on the Setup Specifications Global sheet:
• Flowsheet title to be used on reports
• Run type
• Input and output units
• Valid phases (e.g. vapor-liquid or vapor-liquid-liquid)
• Ambient pressure
Stream report options are located on the Setup ReportOptions Stream sheet.
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SET UP SPECIFICATIONS FORMS
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COMPONENTS
• Use the Components Specifications form to specify all the components required for the simulation.
• If available, physical property parameters for eachcomponent are retrieved from databanks.
• Pure component databanks contain parameters such as molecular weight, critical properties, etc. The databank search order is specified on the Databanks sheet.
• The Find button can be used to search for components.
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COMPONENTS
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ENTERING COMPONENTS
• The Component ID is used to identify the component in simulation inputs and results.
• Each Component ID can be associated with a databankcomponent as either:Formula: Chemical formula of component (e.g., C6H6)Component Name: Full name of component (e.g.,BENZENE)
• Databank components can be searched for using the Find button.Search using component name, formula, component class, molecular weight, boiling point, or CAS number. All components containing specified items will be listed.
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FIND
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PURE COMPONENT DATABANKS
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PROPERTIES• Use the Properties Specifications form to specify the physical property methods to be used in the simulation.
• Property methods are a collection of models and methods used to describe pure component and mixture behavior.
• Choosing the right physical properties is critical for obtaining reliable simulation results.
• Selecting a Process Type will narrow the number of methods available.
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PROPERTIES SPECIFICATIONS FORM
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STREAMS
• Use Stream Input forms to specify the feed streamconditions and composition.
• To specify stream conditions enter two of the following:1. Temperature2. Pressure3. Vapor Fraction
• To specify stream composition enter either:1. Total stream flow and component fractions2. Individual component flows
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STREAMS INPUT FORM
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BLOCKS
• Each Block Input or Block Setup form specifies operating conditions and equipment specifications for the unit operation model.
• Some unit operation models require additional specification forms
• All unit operation models have optional information forms (e.g. BlockOptions form).
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BLOCK FORM
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START THE RUN
Select Control Panel from the View menu or press the Next button to be prompted.
The simulation can be executed when all required forms are complete.
The Next button will take you to any incomplete forms.
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REVIEWING RESULTS• History file or Control Panel Messages Contains any generated errors or warningsSelect History or Control Panel on the View menu to display the History file or the Control Panel
• Stream ResultsContains stream conditions and compositionsFor all streams (/Data/Results Summary/Streams)For individual streams (bring up the stream folder inthe Data Browser and select the Results form)
• Block ResultsContains calculated block operating conditions (bringup the block folder in the Data Browser and select the Results form)
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UNIT OPERATION MODEL TYPE
• Mixers/Splitters • Separators • Heat Exchangers • Columns • Reactors • Pressure Changers • Manipulators • Solids • User Models
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SEPARATORS
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PROBLEM DESCRIPTION
Perform a Flash Calculation for the following stream:
Molar Composition:Ethane: 40%Propane: 40%n-Butane: 20%
Pressure: 15 barTemperature: 25 CelsiusFlow: 100 kmol/hr
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CREATING A FLASH PROCESS To place a unit operation (or piece of
equipment) into the flowsheet window, select it from the Equipment Model Library and then click on the flowsheet window where you would like the piece of equipment to appear.
Required Stream
Optional Stream
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CREATING A FLASH PROCESS Streams can be added by clicking on the
process flowsheet where you would like the stream to begin and clicking again where you would like the stream to end
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SOME ASPEN FEATURES
Color Code:- Red: Information is required / simulation has
finished with errors- Blue: Everything is ok.- Yellow: Input Information has changed /
simulation has finished with warnings.
Next Button:Displays the next required input specification
Next Button
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SET UP
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SPECIFICATION OF CHEMICAL COMPONENTS
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SELECTION OF PHYSICAL PROPERTY MODEL
Peng Robinson: This property method is comparable to the RK-SOAVE property method. It is recommended for gas-processing, refinery, and petrochemical applications. Sample applications include gas plants, crude towers, and ethylene plants.
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SELECTION OF FEED STREAM PROPERTIES
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SELECTION OF EQUIPMENT PARAMETERS Pressure = 0 means no pressure drop
through the equipment. Heat Duty = 0 means no Heat is added to the
equipment.
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RUNNING
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VERIFY YOUR RESULTS
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VERIFY YOUR RESULTS
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REACTORS
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REACTORS
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PROBLEM DESCRIPTION
Aspen Plus will be used with benzene pyrolysis reaction in a plug flow reactor
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REACTION KINETICS
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EXPERIMENT DATA
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PARAMETER VALUES
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FLOWSHEET
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FLOWSHEET
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FLOWSHEET
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FLOWSHEET
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SET UP INPUT FORM
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SET UP INPUT FORM
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COMPONENT INPUT
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COMPONENT INPUT
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PROPERTY INPUT FORM
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STREAM INPUT FORM
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REACTOR INPUT FORM
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PHYSICAL DIMENSION OF REACTION
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INFORMATION FOR REACTIONS
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INFORMATION FOR REACTIONS
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REACTIONS INPUT FORM
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REACTIONS INPUT FORM
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REACTIONS INPUT FORM
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REACTIONS INPUT FORM
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REACTIONS KINETICS INPUT FORM
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REACTIONS KINETICS INPUT FORM
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REACTIONS KINETICS INPUT FORM
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REACTIONS KINETICS INPUT FORM
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RUNNING
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RESULTSExperiment data
Simulation data
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PROBLEM DESCRIPTION
The feed shown in the diagram above will consist of 50 lbmol/hr of Methanol and 50 lbmol/hr of water. A purity of 95% is desired in both thebottoms and distillate product streams using a reflux ratio of 1.5.
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FLOWSHEET
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FLOWSHEET
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FLOWSHEET
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SETUP
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COMPONENT
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PROPERTIES
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STREAMS
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DISTILLATOR
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DISTILLATOR
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DISTILLATOR
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RUNNING
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RESULTS
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Thank you