Simulator fluid catalytic cracker

To facilitate the maintenance and updating of plant performance inputs, we have developed and implemented an LP preprocessor. This preprocessor automatically generates and stores in the LP database the usage of equipment and utilities, the product yields, and the product properties for six process units at Sun Petroleum Products Company s Toledo Refinery. Linked to the preprocessor are three already existing process simulators a fluid catalytic cracker or FCC simulator, a hydrocracker simulator, and a catalytic reformer simulator. 

In this chapter, control of a fluid catalytic cracker will be discussed. A simulator, based on an available model as discussed in the literature, has been developed, which allows the reader to simulate various control schemes and to see the effect of interaction between control loops. Also, the selection of control loops is discussed for this case study. In this particular case study, there are more controlled variables than manipulated variables, which creates the need to develop cascade control structures. Some problems that could occur are highlighted. 

It is of interest to note that the catalytic activity (1 — y) decays exponentially with time according to Eq. 5.77 if the bulk-fluid concentrations are constant. In well-mixed fluidized-beds, concentrations can be considered to be uniform everywhere, approaching CSTR behavior. This exponential decay of catalytic activity has been found (Weekman 1970) satisfactory for the simulation of a fluidized-bed catalytic cracker. 

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