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<p>With the main purpose of exploring adequate viable options for enabling better process efficiency and hence higher economic competitiveness, the reduction process of iron oxide pellets in the hydrogen shaft furnace configured with a center gas collector (CGC) is investigated numerically. The effects of CGC position are first illuminated in order to confirm a feasible option for tuning gas flows and hence pressure distribution within the furnace. After that, efforts are put into evaluating the possibility of using small-sized pellets under the condition of an appropriate setting of CGC position, as well as into identifying to which extent the pellet diameter can be reduced under constraint of the detrimental particle fluidization. The results show that although lowering CGC position leads to a drop in solid reduction degree, the overall pressure drop can be effectively reduced, consequently yielding a smaller fluidization factor under the condition of a high upper-row injection rate. This eventually allows for adopting pellets with a smaller size. Under the conditions where the CGC position is 4.0&#xa0;m, the solid reduction degree experiences an increase along with the decrease in pellet size and reaches a satisfactorily high value when adopting pellets with a diameter of 11&#xa0;mm.</p>

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Process Modeling and Analysis of Hydrogen Reduction of Iron Oxide Pellets in a Shaft Furnace with Selective Gas Recycling: Tuning Gas Flows and Its Benefits

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Chenxi Zhao,
  • Yandong Zhai,
  • Henrik Saxén,
  • Lei Shao

摘要

With the main purpose of exploring adequate viable options for enabling better process efficiency and hence higher economic competitiveness, the reduction process of iron oxide pellets in the hydrogen shaft furnace configured with a center gas collector (CGC) is investigated numerically. The effects of CGC position are first illuminated in order to confirm a feasible option for tuning gas flows and hence pressure distribution within the furnace. After that, efforts are put into evaluating the possibility of using small-sized pellets under the condition of an appropriate setting of CGC position, as well as into identifying to which extent the pellet diameter can be reduced under constraint of the detrimental particle fluidization. The results show that although lowering CGC position leads to a drop in solid reduction degree, the overall pressure drop can be effectively reduced, consequently yielding a smaller fluidization factor under the condition of a high upper-row injection rate. This eventually allows for adopting pellets with a smaller size. Under the conditions where the CGC position is 4.0 m, the solid reduction degree experiences an increase along with the decrease in pellet size and reaches a satisfactorily high value when adopting pellets with a diameter of 11 mm.