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Simulation and Optimization of Relatively New Catalyst Recovery from Old Catalysts Used in the FCC Process by Applying Electrostatic Field

Najafi, Mehrdad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54948 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood; Fotovat, Farzam
  7. Abstract:
  8. In this thesis, the separation process for used and relatively new catalysts of residue fluid catalytic cracking unit by applying an electric field was evaluated. The main purpose of this dissertation is to simulate and design a separation system for separating used and relatively new catalysts of the FCC process in the electrostatic fields. In this regard, various separators were studied, and most of them were simulated under different circumstances. Finally, after examining and analyzing the particle behavior in each of the scenarios, the proposed system was introduced as more effective and efficient than the other separators in order to achieve the ideal separation of the used and relatively new catalysts of the FCC process. In addition, various simulations were performed on the proposed system to investigate the effect of various parameters such as velocity and direction of airflow, size distribution and density of particles, and the applied electric field intensity on the catalyst separation efficiency. In order to actualize this goal, Comsol Multiphysics software has been used because of having governing equations of this project. This software uses the physics of laminar flow, electrostatic, and charged particle tracing to solve the relevant equations. In the modeling part of this project, the Eulerian approach for the gas or air phase as a continuous phase was used, as well as the Lagrangian approach for observing and tracking the position of particles as a dispersed phase. By doing so, hydrodynamic behavior and trajectory of the particles under the influence of the electric field have been simulated by the computational fluid dynamics-discrete element method (CFD-DEM). In the results section, the effect of these parameters was given for a wide range of particle size distributions. According to the results of the simulations, it can be claimed that the velocity of the airflow and the intensity of the applied electric field are two crucial and critical parameters to achieve the catalyst separation process with ideal efficiency. In this regard, the results indicate that high separation efficiency can be achieved in the proposed separator with an airflow velocity of 0.1 m/s, an electric field of 10 kV, and a pipe angle of 45
  9. Keywords:
  10. Gas-Solid Flow ; Two Phase Flow ; Computational Fluid Dynamics-Discrete Element Method (CFD-DEM)Simulation ; Fluid Catalytic Cracking (FCC)Process ; Particles Separation ; Particle Separation by Applying Electric Field

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