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CFD Simulation of Slurry Bubble Column for Heavy Crude Oil Hydrocracking

Azimi Yancheshme, Amir | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46632 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood; Zarkesh, Jamshidi
  7. Abstract:
  8. In this project, for hydrodynamic simulation of RIPI experimental bubble column with concerning chemical reaction, first only hydrodynamic simulation and then hydrodynamic with reaction was done. For complete knowledge about bubble columns hydrodynamic, all common flow regimes were studied. First of all a rectangular semi-batch bubble column with bubbly flow regime and gas flow of 0.26 m3/h was simulated with commercial CFD software, FLUENT v. 14.5. Euler-Euler approach in 2D and 3D was used and because of bubbly flow regime a mean constant diameter was assumed for dispersed gas phase. Effect of interfacial forces (e. g drag, lift and virtual mass) was studied and compared with experimental data. After that a cylindrical semi-batch bubble column with churn-turbulent flow regime and gas flow rate of 54 m3/h was simulated. Euler-Euler approach in 2D axisymmetric geometry was used and dispersed phase was modeled through 3 approach; first assuming constant bubble diameter, second interfacial area concentration method and third population balance method which third method showed the best agreement with experimental data. Also the effect of bubble size distribution in population balance method was considered and concluded that in churn-turbulent regime the equilibrium bubble size distribution is approximately independent of inlet gas distribution condition. Effect of turbulent dispersion and bubble induced turbulent were also studied for churn-turbulent flow regime. With respect to two previous reactors results, simulation of RIPI experimental reactor with gas flow of 100 m3/h was done and residence time distribution data of glycol pulse tracer was compared with corresponding experimental data of RIPI. A good agreement was observed with mean relative error about 20%. Finally a hypothetic chemical reaction (and a chemical reaction network) was considered in RIPI reactor simulation and results were compared with 2-tanks-in-series model and excellent agreement was observed
  9. Keywords:
  10. Hydrodynamics ; Chemical Reactions ; Computational Fluid Dynamics (CFD) ; Hydrocracking ; Bubble Column Bioreactor

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