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- W2949999044 abstract "Abstract The steel industry is facing increasing pressure and challenges from the environment in recent years. The urgent utilization of clean energy not only reduces greenhouse gas emissions, but also promotes future innovations in blast furnace iron making technology. Hydrogen (H 2 ) energy is considered to be one of the most promising alternatives to carbon-based fossil energy for the reduction of iron oxides. Therefore, the gaseous reduction of iron oxides by H 2 has been intensively studied for decades. However, the impact of H 2 on the shrinkage behavior of iron oxide packed beds above 900 °C has rarely been studied, and the interaction between H 2 and carbon monoxide (CO) in the shrinking process is not fully understood. Therefore, this study uses H 2 , CO and H 2 +CO mixture gas for the well-designed high temperature experiments of wustite (FeO) packed beds. The results show that H 2 protects the coke from further damage in the packed bed at 900–1000 °C, and the corresponding shrinkage rate (SR) decreases from 0.31%/°C for CO case to 0.16%/°C. Meanwhile, when the temperature exceeds 1350 °C, the packed bed under the CO atmosphere accelerates shrinkage due to the melting and dripping of the metallic iron after carbonization. By contrast, when CO is replaced by H 2 , the carbonization process is controlled by the solid state diffusion of coke carbon rather than the reverse Boudouard reaction. As a result, the lower carbonization efficiency not only increases the transition temperature by up to 100 °C, but also reduces the weight of the melted hot metal by one third, which significantly improves the bed permeability." @default.
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- W2949999044 date "2019-07-01" @default.
- W2949999044 modified "2023-10-12" @default.
- W2949999044 title "Hydrogen impact on the shrinkage behaviors of wustite packed beds above 900 °C" @default.
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- W2949999044 doi "https://doi.org/10.1016/j.ijhydene.2019.05.181" @default.
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