Introduction to Modelling Air Separation Units

• Leverage the intuitive solving capabilities and other key features of Aspen HYSYS that allow for rapid flowsheet construction
• Discover how multi-flowsheet integration can streamline and organize simulation efforts
• Evaluate the performance of existing equipment by leveraging the equipment rating capabilities of Aspen HYSYS
• Improve the convergence characteristics of columns and flowsheets; troubleshoot common problems
• Perform Case Studies to determine the optimum operating points for a process

• Instruction on basic topics
• An experienced instructor will present modules in an appropriate order for maximum understanding
• Discussion about the general approach and the key elements for the successful simulation of an ASU
• Instructor-guided demonstrations of features
• Hands-on workshops leading to the complete simulation of an ASU
• Detailed course notes

• Integrated Crude distillation preheat train overview in HYSYS
• Convert the HYSYS Simulation to EO Sub-flowsheet
• Compare performance difference between SM and EO Solvers
• Use EO configuration group to change flowsheet solution
• Perform sensitivity analysis

A background in chemical/process engineering (preferably with experience in cryogenic / ASU plant design or operation)

• EHY101: Aspen HYSYS: Process Modelling
• EHY121 Building MS Excel User Interfaces for Aspen HYSYS Simulations Using Aspen Simulation Workbook
• EHY202 Aspen HYSYS: Advanced Process Modeling Topics
• EHY223 Aspen HYSYS Dynamics: Introduction to Dynamic Modeling

• Examine the Product requirements for the ASU plant to be simulated
• Anaylze the proposed process design 

• Enter necessary elements to fully define a Fluid Package 
• Understand the relative volatility of components in the system
• Investigate the phase behavior of typical fluids in the ASU process

• Define the atmospheric air to be used as feedstock
• Configure a 3-stage air compressor to produce Medium Pressure (MP) Air

• Specify two Absorbers to represent the DCAC for MAC discharge air cooling
• Use a Recycle option to link these two sections
• Configure an additional column to create ChW for the DCAC, using cold Waste gas from the ASU
• Use the Column Analysis tool to understand the ChWT hydraulics

• Use a component splitter to remove the moisture and carbon dioxide from the coldbox feed air.

• Split the dry air into process and utility streams
• Configure a multi-stage compressor producing Intermediate Pressure (IP) Air for expansion and High Pressure (HP) Air for Liquid Air generation
• Split the HP Air to the HP and Low Pressure (LP) column systems

• Define a multi-stream Plate-Fin heat exchanger to cool the MP, IP and HP Air streams and recover refrigeration from the coldbox. 
• Use an Expander model to remove energy from the IP Air stream, creating refrigeration.

• Configure a 2-column system (with a side operation, rectifier) to produce streams of the required product flow and composition.
• Set up a Subcooler and Crude Argon Condenser
• Fully define all column feed streams (using a Recycle where necessary -for further adjustment)
• Install a pump to raise the Liquid Oxygen (LOX) pressure to product specification

• Integrate Crude Argon condenser (column system) into the Main flowsheet
• Integrate column product streams into the MHE and Subcooler for refrigeration recovery
• Link the HP Column condenser to the LP Column reboiler
• Close heat and mass balance on the waste circuit

• Route cryogenic liquid streams to storage
• Perform ‘heat leak’ calculations on storage tanks
• Configure a Gaseous Oxygen (GOX) pipeline
• Use a multi-stage compressor model to compressor Gaseous Nitrogen (GAN) from coldbox to meet product specification

• Use the HyproTech SQP optimizer to determine the optimum plant conditions to minimize energy usage.