Dynamic Behaviour of Fixed Bed Catalytic Reactors

Abstract

Characterizing dynamic behaviour depends on identifying all the significant factors which must be included in models which are used to describe the system. As operation at higher performance is demanded the level of approximation assumes greater importance. At the same time there is a need to examine the way in which reduced models can be developed for use in control. This paper examines these issues with reference to the multitubular fixed bed reactor and in particular looks at how the coolant temperature profiles influence the dynamics. It specifically examines how the temperature profiles affect the inverse response both in terms of the extent and location in the reactor and the way in which disturbances are propagated. Consideration is also given to the effect of changes in reactant flow rate and the way in which it affects the inverse response.