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Keywords:

  • reaction kinetics;
  • mathematical modeling;
  • reactor analysis

The syngas chemical looping process coproduces hydrogen and electricity with iron oxide based oxygen carriers in a circulating moving bed system. In this article, a one-dimensional (1-D) dynamic model is developed to simulate the countercurrent gas–solid reactive flow in the moving-bed reducer. This model is validated by TGA and bench-scale experiments. Both the steady state and dynamic composition profiles are obtained to help understand the reaction and reactor behaviors. Numerical simulation on the effects of reactor length is conducted to optimize the moving-bed reducer design. It is also found that minor variations in the feed rate ratio near a critical point that is represented by the reaction equilibrium could yield a significant difference in the time required for the reactions to reach a steady-state operation. Such a difference has an important practical implication in that the moving-bed reducer should be designed and operated to circumvent the critical point. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3432–3443, 2013