Dynamic model of FCCU and its application in a hybrid fault diagnosis system

The dynamic model of fluid catalytic cracking unit (FCCU) based on first principle analysis was discussed and built. It was simplified by spatial discretization to be applied in the simulation system to meet the real time requirement. Dynamic simulation is a key technique in safety science and safety engineering field which can be used for process hazard assessment, hazard identification, safety control system design and operating personnel training. Based on dynamic model and simulation, we proposed a new structure of a hybrid fault diagnosis system of FCCU which integrates signed directed graph (SDG), artificial neural network (ANN) together with dynamic simulation. Dynamic model and simulation are the foundation and play very important roles in this hybrid fault diagnosis system.