Abstract
In this study, the multi-phase Eulerian–Eulerian two-fluid method (TFM) coupled with the kinetic theory of granular flow (KTGF) was used to investigate the hydrodynamics of particle flows (Geldart Group B) in a lab-scale bubbling fluidized bed. The goal was to improve the bubble flow behavior inside the fluidized bed to improve the distribution of an injected liquid, by increasing the flow of bubbles entering the spray jet cavity and, thus, reduce the formation of wet agglomerates. The effects of a baffle on both the injection level and the whole fluidized bed were studied. Different baffle geometries were also investigated. Adding a fluxtube to a baffle can improve the bubble flows and a long fluxtube works best at redirecting gas bubbles. Baffles tend to smooth out variations in the gas distribution caused by the non-uniform inlet gas distribution. A gas pocket appears under all the baffles.
Highlights
Fluidization is a process that allows solid particles to be handled like a fluid [1]
Inserting baffles is one of the main methods applied in fluidized bed to modify gas solid dynamic
Baffles can reduce solids bypassing in circulating fluidized beds [6,7], limit the gas backmixing [8,9], and improve the mixing of particles in a certain direction [10,11,12,13,14]
Summary
Fluidization is a process that allows solid particles to be handled like a fluid [1]. Inserting baffles is one of the main methods applied in fluidized bed to modify gas solid dynamic. In the Fluid CokingTM process, heavy oil is sprayed with atomization steam into a bubbling fluidized bed with hot coke particles. Imperfect dispersion of the sprayed liquid on the fluidized particles leads to the formation of wet agglomerates that decrease heat and mass transfer rates, thereby causing operating problems, especially in the stripper section where hydrocarbons vapors are removed from the coke particles just before they exit the reactor vessel [27,28,29]. Simulated the cold model of Fluid CokingTM unit by a multi-Eulerian–Eulerian method Both FCC and coke particles were used to study the hydrodynamics. The main goal was to optimize the novel baffle with fluxtube to maximize its function on modifying the gas bubble distribution and applying the results in the Fluid CokingTM process to reduce the wet agglomerates
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
