Journal
FUEL
Volume 324, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124401
Keywords
Methane decomposition; Hydrogen production; Particle deposition; Porous media; Two-way coupling
Categories
Funding
- National Natural Science Foundation of China [22178247, 21978203]
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In this study, a dynamic Eulerian-Lagrangian framework combined with porous media model was developed to simulate the performance variations of a tubular methane decomposition reactor. Particle behaviors and two-way coupling between continuous phase and carbon particles were considered. The results showed that the reaction accelerated with the formation of carbon particles and deposits, and there were significant variations of the local particle size distribution across the reactor. The causes of carbon plug formation and its impact were discussed.
In this study, a dynamic Eulerian-Lagrangian framework combined with porous media model was developed to simulate the performance variations of a tubular methane decomposition reactor, including its deposition rate, methane conversion, yields of hydrogen and carbon particles. The particle behaviors including their nucleation, trajectory, heat radiation, growth due to heterogeneous reaction, collision and deposition at the reactor wall were taken into account. The numerical model employed multi-step reaction mechanism and accounted for the two-way coupling between continuous phase and carbon particles. Simulation results of both continuous phase and discrete phase were compared with experiment results and other TDM models. It was suggested that the TDM reaction accelerated with the formation of carbon particles and deposits. There were significant variations of the local particle size distribution across the reactor due to the boundary layer and the uneven temperature field. And the causes of carbon plug formation, increasing the flow resistance and eventually lowering the life of reaction tube, were discussed.
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