Estimation Of Physical Properties And Hydrodynamics Of Slurry Bubble Column Reactor For Catalytic Hydrocracking Of Vacuum Residue
CHEMICAL ENGINEERING JOURNAL(2021)
摘要
Vacuum residue (VR) was subjected to catalytic hydrocracking with H2 in a pilot-scale slurry bubble column reactor (SBCR) with 0.05 m diameter and 2 m height at 425 ?C and 160 bar in the homogeneous regime. The gas holdup (alpha G) and composition of the product classified into five pseudo-components were measured in the SBCR. The physical properties such as density, viscosity, and surface tension of VR (feed) were analyzed prior to a threedimensional Eulerian computational fluid dynamics (CFD) simulation to predict axial and radial hydrodynamics in the SBCR. Rather than considering the hydrocracking reactions in the CFD model, a reaction-mixture model was used to predict the variation of the axial physical properties as the reaction progresses. A customized drag coefficient based on experimental data was applied to the CFD model. The value of alpha G predicted by the CFD model at a superficial gas velocity of 6.4 mm/s was 6.2% which is comparable to the experimental value (6.6%). The Sauter mean diameter and specific surface area were estimated to be 1.2 mm and 304 m2/m3, respectively. The proposed CFD model, which was integrated with the axial physical properties but decoupled from chemical reaction, successfully predicted the hydrodynamics of the H2-VR SBCR.
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关键词
Vacuum residue (VR), Catalytic hydrocracking, Slurry bubble column reactor (SBCR), Physical property estimation, Computational fluid dynamics (CFD), Hydrodynamics
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