Chemstations, Inc – Houston, TX – – An Overview of Process Simulation What is needed? What are the steps?

Chemstations, Inc – Houston, TX – – 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)

Chemstations, Inc – Houston, TX – – 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

Chemstations, Inc – Houston, TX – – 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

Chemstations, Inc – Houston, TX – – Numerical methods – modular sequential equation based combination Calculation mode – steady state dynamic Lean Oil Absorption System – What do we need to simulate?

Chemstations, Inc – Houston, TX – – Step 1: Draw the flowsheet Graphics mode – UnitOps Streams Text Symbols

Chemstations, Inc – Houston, TX – – Step 2: Select engineering units

Chemstations, Inc – Houston, TX – – Step 3: Define components (data) Pure components from the database, crude distillation curves from the database, or, user input distillation curve(s).

Chemstations, Inc – Houston, TX – – Step 4: Select thermodynamic options K-value (phase equilibrium) options, Enthalpy (heat balance) options.

Chemstations, Inc – Houston, TX – – Step 5: Specify feed streams

Chemstations, Inc – Houston, TX – – Step 6: Specify the equipment

Chemstations, Inc – Houston, TX – – Step 7: Run the simulation

Chemstations, Inc – Houston, TX – – Step 8: Draw the PFD Stream data boxes UnitOp data boxes T, P, F boxes

Chemstations, Inc – Houston, TX – – Step 9: Size equipment

Chemstations, Inc – Houston, TX – – Step 10: Generate a report