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Optimum Design of Micro Reactor for CO2 Methanation by CFD

Faris Abadi, Ali | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54805 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad
  7. Abstract:
  8. In this study, the viability of handling flue gas streams as a source of CO2 for the thermocatalytic conversion was investigated as a CO2 emissions reduction strategy and an intermittent energy storage solution. A transient mathematical model for dynamic catalyst deactivation was validated with experimental results and then used to study HEX membrane reactor. A simulation-based study of novel Sabatier reactor configurations was performed to study the effect of distributed H2 supply on Ni-based catalyst deactivation and to optimize the production of CH4. First, a heat-exchanger type, actively cooled Sabatier reactor is analyzed using a transient mathematical model to assess its feasibility. Effect of tube configuration, space velocity, and cooling rate on reactor performance was investigated. The simulation results show that in the condition of Pt,f = 10 bar, Tf = 600 K, 100 h-1 < SV < 1000 h-1 and Gc = 0.1 Gc,0, it is possible to achieve CO2 conversion of more than 90%. Next, a heat-exchanger type, air-cooled membrane reactor is analyzed and simulation results showed significantly lower catalyst deactivation rates in the membrane reactor due to the distributed H2 supply that results in more uniform temperature distribution. The model predicts that, with a proper selection of operating parameters, it is possible to achieve CO2 conversions over 95% over extended periods of operation (10,000 h). Therefore simulation results predicts that by using the membrane in conditions equivalent to SVPB = 222 h-1 and SVPB / SVM = 50, it is possible to achieve CO2 conversions more than 90% with 100% CH4 selectivity over extended periods of operation
  9. Keywords:
  10. Membrane Reactor ; Computational Fluid Dynamics (CFD) ; Sabatier Reaction ; Carbon Dioxide Methanation ; Fuel Production

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