Dynamic Simulation Essentials with Aspen HYSYS

Convert a steady-state Aspen HYSYS model to dynamic by setting boundary stream pressure-flow specs and initializing mixer and cooler; use the dynamic assistant and add a PID controller.

Explore converting a steady-state Aspen HYSYS model to dynamic simulation using the dynamic assistant, including setting boundary stream pressure specifications, valve insertion, equalizing streams, and sizing considerations for dynamic state.

Apply pid controllers in dynamic simulations by selecting a process variable, defining a set point, and using valve position as output to regulate level, temperature, or flow.

Add three pid controllers in dynamic mode: a flow controller for the feed valve, a level controller for the separator, and a temperature controller for stream six via the cooler.

Add a PID pressure controller to the separator and cascade it with the flow indicator to regulate vessel pressure via feed flow changes; analyze cascade control dynamics and setpoints.

Explore dynamic simulation of a compressor system in Aspen HYSYS, including a discharge valve failure scenario, surge and stonewall curves, and anti-surge controls.

Simulate an emergency shutdown to assess the compressor operating point, adjust hot bypass cv and anti-surge valve, and move from stonewall toward the safe area between surge and stonewall.

Set up a dynamic flow node network in HYSYS, configuring a field unit, mixer, separators, valves, a heater, and a tower with delta p and delta b.

Size the column in dynamic mode using hydraulic calculations to determine tray pressure drops. Configure the column environment and tray dimensions, while hydraulics set condenser and reboiler pressures for convergence.

Explore dynamic assistant workflows in Aspen HYSYS to convert steady state to dynamic state, configure auto sections and sizing, set pressure specifications, and troubleshoot discrepancies.

Implement dynamic level controllers with a pid controller for separators, condenser, and reboiler, regulating liquid percent levels via valves and reflux to maintain safe, efficient operation.

Configure column temperature controllers in Aspen HYSYS—top stage, bottom stage, and an outside stream—tune with direct-acting control and setpoint ranges, and assign outputs to condenser duty or reboiler valve.