DIGITAL-SIMULATION OF INDUSTRIAL FLUID CATALYTIC CRACKING UNITS .5. STATIC AND DYNAMIC BIFURCATION

A dynamic model, whose steady-state version has been verified against industrial units in earlier parts of this series, is used to investiga te the static and dynamic bifurcation behaviour of an industrial fluid catalytic cracking (FCC) unit. The investigation concentrates on fixe d point and periodic attractors of this industrially important unit. T he results show some of the important static and dynamic features of t he unit and also point-out to means of stabilizing the unstable high g asoline yield operating points. in certain cases operating the unit on a periodic attractor can give higher gasoline yields, however more wo rk is needed to identify regions of design and operating parameters wh ere this possibility can be realized without the practical problems as sociated with it.