Scenarios for the AA3 example simulation

Step 1 - pressurize bed 1 and vent bed 2

This scenario pressurizes Bed 1. At the same time, it vents Bed 2 through the RV3 valve by opening the SV2_2 supply valve. It routes the unit feed entirely to Bed 1 as the SV1_1 supply valve opens and the SV1_2 supply valve closes. The duration is 30 seconds.

Step 2 - bed 1 produces and vent 2 keeps venting

This scenario draws product from Bed 1 by opening the SV5 and RV2 valves in the upper-left product line. The top RV2 valve on the exit line also opens, although the final exit valve, EX1, remains fully closed. Bed 2 continues to vent through the lower-right vent line during this scenario. The duration is 20 seconds.

Step 3 - pressurize bed 2 and vent bed 1

This scenario is the inverse of the initial pressurization step for Bed 1. It depressurizes Bed 1 and pressurizes Bed 2. That is, while Bed 2 pressurizes, Bed 1 vents through the RV3 valve by opening the SV2_1 valve. This scenario routes the unit feed entirely to Bed 2 as the SV1_2 supply valve opens and the SV1_1 supply valve closes. The duration is 30 seconds.

Step 4 - bed 2 produces and vent 1 keeps venting

This scenario is the inverse of the initial production step for Bed 1. It draws product from Bed 2 by opening the SV3 and RV2 valves in the upper-right product line. The RV1 valve on the exit line also opens, although the final exit valve, EX1, remains fully closed. Bed 1 continues to vent through the lower-left vent line during this scenario. The duration is 20 seconds.

All steps - the full cycle

This scenario combines the four steps into a single scenario that represents a full pressure swing adsorption (PSA) cycle. Initially, we pressurize Bed 1 and then set it into production while Bed 2 vents in parallel. Then, we reverse the actions to pressurize Bed 2 and then set it into production while Bed 1 vents in parallel. The duration of the full cycle is 110 seconds.

Run 5 cycles

This scenario runs five full PSA cycles so that you can observe how the cycles slowly approach identical, repetitive behavior.

Run 10 cycles

This scenario runs ten full PSA cycles. The conditions at the initial and final moments of each cycle will slowly converge to the same numbers, indicating a cyclic behavior.