Resumen de First-Principles Dynamic Simulation: Worth for Control Engineers?
A first-principles dynamic model of a Depropanizer column is used to test and to confirm a new proposed operation and control mode that improves the steam consumption and the stability of the column. The previous column operation mode was not suitable for the planned Advanced Process Control (APC) project in the area of this unit, so a new basic control scheme was proposed, simulated and validated in the rigorous dynamic model. The new control scheme was tested and implemented in the plant confirming the predicted results of the model. This case study shows how Control Engineers can make practical use of first-principles dynamic modelling technologies, which are now becoming mature enough to provide significant value for control purposes.
The modelling efforts have been analyzed from the Control Engineer¿s perspective, including a discussion of best practices to optimize the use of internal resources.
1.Introduction This study was prompted by the modeling problems found in the new Advanced Process Control (APC) system of the FCC unit. After some Step-Tests, the identified DMCplus® multivariable controller models were showing some problems related to the heat and material balance in the Depropanizer column of the FCC Gas unit, specifically associated with the head pressure and bottom and top qualities.
