Dynamic Process Simulations

This video is one of a 10 part series. Visit our channel's playlist to watch the full set. If you would like more information about Opgrade or Nate Barber visit www.opgrade.com. Narrator: Nate Barber Video slides: DYNAMIC PROCESS SIMULATIONS How to Design for Transient Process Conditions -What is a Dynamic Process Simulation? *Steady-state process simulation / Time- Based process simulation *Uses a matrix based pressure-flow solver *The iterative process: -Converge pressures, temperatures and flows -Move forward in time -Repeat *Time steps can range from 1 s to 1x10-4 s *Not yet as easy as simply switching to dynamics -Mostly because of static dP values across valves, etc. -Pressure-flow solvers are irritable rapscallions -Why perform Dynamic Process Simulations? * Nothing in life is truly steady-state -Greatest hazards exist within transient conditions -Seemingly simple processes can turn out to be counter-intuitive dynamically * Predictive control -Better understand how a control scheme will work -Estimate tuning parameters before start-up * Design optimization - Identify and troubleshoot issues in design-phase - Case studies to assess effects of design modifications * Operator training -How to perform a Dynamic Process Simulation *Collect and document assumptions in a Study Basis -Collaborative document to gain team agreement *Start developing initial pseudo-steady state model -Keep it as simple as possible until simple isn’t enough -Always stay in dynamics mode for any sizable model -Far easier to add elements in dynamic mode than trying to convert from steady state to dynamics *Start running model according to Study Basis -Does the model need to change to better reflect reality? -Do assumptions need to change to better reflect reality? *Collect and document results in a Final Report -Available software *AspenTech -HYSYS Dynamics -Aspen Plus Dynamics -Aspen Custom Modeler *Invensys (PRO/II) -SimSci DYNSIM