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Simulation of GTL Process Slurry Bubble Column Reactor Using CFD Methods

Irani, Mohammad | 2009

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 40159 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bozorgmehri, Ramin; Pishvaie, Mahmoud Reza; Tavassoli, Ahmad
  7. Abstract:
  8. In this thesis non-ideal behavior of fluids and its effects on hydrodynamic and mass transfer in multiphase flow is studied. A numerical framework has been proposed to model the interacting effects of mixture non-ideality and mass transfer on hydrodynamics of a multiphase system using CFD methods. Using the numerical framework mass and momentum transfer in a system was simulated. The system consists of a cylindrical vessel filled with vapor and liquid hydrocarbons which selected as the benchmark. The liquid hydrocarbon is chosen to be pure Octane and the hydrocarbon in the gas phase is assumed to be Propane. Due to operating condition (T=323 K, P =445 kpa) the behavior of fluid is non-ideal and non-ideality in equilibrium and density calculation was considered using Peng-Rabinson equation of state. The simulation results were validated by experimental data obtained in Research Institute of Petroleum Industry Laboratories. The comparison was shown good agreement between simulation and experiments and hereby the numerical framework was validated. Also due to understanding impact of thermodynamic non-idealities and mass transfer on multi-phase hydrodynamics, two comparative cases were considered. In the first case density of phases were assumed to be constant, and in the second case they were calculated by Peng-Robinson equation of state. In both cases Rault’s law was used instead of fugacity coefficient definition for both the liquid and gas phases. The system assumed to be isothermal therefore equilibrium calculation was T-P flash. The results indicated that the assumption of constant density in simulation had major role to diverse from experimental data. Furthermore, comparison between obtained results indicated significant differences between experimental data and simulation results with more ideal assumptions. After validation of the numerical framework, former system was simulated in non-isothermal condition so in this case, energy balance equation was solved with mass and momentum balance equations. Also non-ideality was considered in calculation of internal energy. The results of non-isothermal simulation were expectable and logical.Then mass and momentum transfers between propane (as gas-phase) and octane (as liquid-phase) were simulated in bubble column. In the bubble column system, propane was entered to column that filled with octane and after mass transfer with octane, leaves the column. The system was assumed to be isothermal and turbulence equations in addition of equations in isothermal case, were considered. Solving this case and resolving its bottlenecks was conducted to simulation of slurry bubble column reactor
  9. Keywords:
  10. Slurry Reactors ; Simulation ; Equilibrium Calculations ; Computational Fluid Dynamics (CFD) ; Gas to Liquid (GTL)Process ; Nonideal Thermodynamic Behavior

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