Hungarian journal of industrial chemistry, 1976
1. szám - Mohilla, R. - Ferencz, B. - Varga, M. - Bakos, M.: Studies on the Dynamics of Downward Cocurrent Gas-Liquid Flow in Packed-Bed Reactors
Hungarian Journal of Industrial Chemistry Veszprém Vol. i*. pp. 1-iU (197б') STUDIES ON THE DYNAMICS OF DOWNWARD COCURRENT GAS-LIQOID FLOW IN PACRED-BED REACTORS R. MOHILLA, В. FERENCZ, Mrs. M. VARGA and M. BAKOS (Veszprém University of Chemical Engineering, Veszprém, Hungary) Recevied: October h, 1975-This paper presents the mathematical model describing the dynamic behaviour of a co-current gasliquid system flowing downward in a packed-bed reactor. Based on the parameters of the reactor, the frequencyresponse characterizing the dynamic behaviour, can be calculated from the mathematical model developed if the disturbing function is a change occurring in input concentration. The way to create this mathematical model,the algorithm used to calculate the chareacteristic frequency responses, the critical comparison of the calculated and experimental results are presented here. INTRODUCTION Packed-bed catalitic reactors with downward flowing gas and liquid phases are not at all uncommon in the practice of chemical industry. However, there are only a few papers dealing with the dynamic behaviour of such operation units although this knowledge is indispensable to design appropriate control for such systems. Previous experiments revealed that the reaction taking place, and even more so, the pore-diffusion process, hase little - if any - effect on the dynamic behaviour. Hydrodynamics play the controlling role. Therefore, it seemed worthwhile to develop the mathematical model of an operation unit featuring convective, conductive