Performance of a Catalytic Gas–Solid Fluidized Bed Reactor in the Presence of Interparticle Forces

Abstract

The influence of interparticle forces (IPFs) on the hydrodynamics of a gas-solid fluidized bed was experimentally investigated with the help of a polymer coating approach. The results showed that the presence of IPFs in the bed can considerably change the hydrodynamic parameters. The tendency of the fluidizing gas passing through the bed in the emulsion phase increased with IPFs in the bubbling regime. The performance of a fluidized bed reactor was then studied through simulation of a reactive catalytic system using three different hydrodynamic models: (a) a simple two-phase flow model, (b) a dynamic two-phase flow model, and (c) a dynamic two-phase flow model, integrating the effects of superficial gas velocity and IPFs. The simple two-phase flow model was found to underestimate the reactor performance for catalytic reaction most likely due to the oversimplified assumptions involved in this model. Also, the simulation results showed that modification of the bed hydrodynamics due to IPFs resulted in a better performance for a bubbling fluidized bed reactor. This suggests that the hydrodynamic models should take into account the effects of superficial gas velocity and variation in the ratio of the magnitude of IPFs/hydrodynamic forces, due to any operational reason, to yield a more reliable evaluation of the performance of the fluidized bed reactor.

Mathematical modelling of catalytic cracking riser reactor

“…Formation of naphthenes and isoparaffin from olefin and diolefin 14 14 Olefins Olefins W k C C = Stage 2. Formation of aromatics and isoparaffin from olefin and naphthene 15 15 Olefins NaphthenesMMW W k C C =…”

“…Russian and world scientists investigate the effect of technological mode, reactor design, catalyst compositions, hydrodynamic mode of catalytic cracking experimentally or using the mathematical models [10][11][12][13][14][15][16]. A large number of research is dedicated to mathematical modelling of catalytic cracking with different detailing of hydrocarbons conversion scheme (depending on the required predictive power) considering with the catalyst deactivation [17][18][19][20][21][22][23][24][25][26][27].…”

Comparative Study of Different Two-Phase Models for the Propane Oxidative Dehydrogenation in a Bubbling Fluidized Bed Containing the VOx/γ-Al2O3 Catalyst

“…It has been reported differently, and even inconsistent results were seen in the open literature. 26,37,38 In the following, it has been referred to some papers that have reported inconsistent opinion with the obtained results in this work about the effects of the oxygen content.…”

“…These assumptions were far from the reality of the fluid bed. The existence of the solids in the bubbles has been shown experimentally and theoretically. − In addition, the amount of gas in the emulsion phase can be much higher than minimum fluidization condition, especially at higher U 0 . , Therefore, gas and solid distributed dynamically in the bed, which had a significant effect on the mass transfer rates and reaction rates in the fluidized bed. On the other hand, the mixing of the two phases improved at higher superficial gas velocities .…”