(319h) Hydrodynamics and Heat-Transfer Characteristics of H2-Vacuum Residue Slurry Bubble Column Reactor

Authors: 
Tran, B. V., Hankyong National University
Ngo, S. I., Hankyong National University
Lim, Y. I., Hankyong National University
Pham, H. H., Korea Institute of Energy Research
Lim, S. H., Korea Institute of Energy Research
Go, K. S., Korea Research Institute of Chemical Technology
Nho, N. S., Korea Institute of Energy Research
The hydrogen-vacuum residue (H2-VR) slurry bubble column reactor (SBCR) with catalytic hydrocracking reactions was carried out in a pilot-scale SBCR under 160 bar and 425 ºC. The total gas holdup () was experimentally measured in the H2-VR SBCR with 2 m height and 0.05 m inner diameter, which was operated at a superficial gas and liquid velocities of 6.4 and 0.27 mm/s, respectively. A two-phase Eulerian computational fluid dynamics (CFD) model coupled with the population balance equation (PBE) was developed for the H2-VR SBCR. A reaction-mixture model was proposed to predict the physical properties varying with catalytic hydrocracking reactions along the reactor height. In order to calculate the momentum-transfer between two phases, the ratio of the drag coefficient to the bubble size was estimated based on the force balance for a rising bubble, and the swarm correction factor was integrated. The predicted by the CFD-PBE model was 6%, which was comparable to experimental data (6.6%). The bubble size and specific surface area were estimated to be 1.2 mm and 300 m2/m3, respectively. The temperature was distributed evenly in both axial and radial directions, except near the bottom.