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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
An Overview of Process Simulation
•What is needed?
•What are the steps?
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Lean Oil Absorption System – What do we need to simulate?
Data on the materials being processed -
Physical properties –•vapor pressure•density•heat capacity•etc.
Transport properties –•viscosity•thermal conductivity•etc.
For pure components and distillation curves (DB or input)
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Lean Oil Absorption System – What do we need to simulate?
Models of the equipment – Unit Operations
Distillation
Heat exchangers
Pumps
•Reactors•Pipes•Compressors•Etc.•56 in Chemcad•Can add own
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Lean Oil Absorption System – What do we need to simulate?
Models of behavior of materials (laws of thermodynamics) -
•Phase behavior•Reaction behavior•Heat flow behavior•Momentum behavior
Can be calculated based on equilibrium or rate based –•mass transfer•heat transfer•reaction rates•pressure drops
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Numerical methods –•modular sequential•equation based•combination
Calculation mode –•steady state•dynamic
Lean Oil Absorption System – What do we need to simulate?
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 1: Draw the flowsheet
Graphics mode –•UnitOps•Streams•Text•Symbols
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 2: Select engineering units
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 3: Define components (data)
Pure components from the database,crude distillation curves from the database,or, user input distillation curve(s).
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 4: Select thermodynamic options
K-value (phase equilibrium) options,Enthalpy (heat balance) options.
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 5: Specify feed streams
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 6: Specify the equipment
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 7: Run the simulation
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 8: Draw the PFD
Stream data boxes
UnitOp data boxes
T, P, F boxes
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 9: Size equipment
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Chemstations, Inc – Houston, TX – 800.243.6223 – http://www.chemstations.net
Step 10: Generate a report