How are dynamic data input into the simulation system in Aspen dynamic simulation?
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I would like to ask how dynamic data is entered into the simulation system in Aspen Dynamic Simulation. Why, after setting the controller, doesn’t the feed composition change and remains at the value it had in the steady-state condition? Even when running the simulation dynamically, many time-varying curves are still generated. What I mean is, under what conditions or due to what changes in set values do the values change over time in dynamic simulation? Because even after adding the controller, the values from the steady state are still used, and those values aren’t being changed. In chamcad, you can set things such as the variation of the feed composition over time. For example, the feed composition is 0.3B from 0 to 5 minutes, and 0.3–0.4 from 5 to 10 minutes. I just don’t understand what causes the changes in the output results in Aspen. What is the setpoint value in the controller? Please advise, experts
The set point defines the steady-state value. Generally, in dynamic systems, pressure difference is used as the driving force; that is, the flow rate is changed by variations in pressure difference. The results change at different times because, during this process, the factors that affect the pressure difference change. For example, changing the inlet flow rate, composition, etc., can all cause changes.