工业铁矿石球团的氢基直接还原：统计设计实验与计算模拟

Patrícia Metolina; Tiago Ramos Ribeiro; Roberto Guardani

doi:10.1007/s12613-022-2487-3

Volume 29 Issue 10

Oct. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(10): 1908-1921

Patrícia Metolina, Tiago Ramos Ribeiro, and Roberto Guardani, Hydrogen-based direct reduction of industrial iron ore pellets: Statistically designed experiments and computational simulation, Int. J. Miner. Metall. Mater., 29(2022), No. 10, pp. 1908-1921. https://doi.org/10.1007/s12613-022-2487-3

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Patrícia Metolina, Tiago Ramos Ribeiro, and Roberto Guardani, Hydrogen-based direct reduction of industrial iron ore pellets: Statistically designed experiments and computational simulation, Int. J. Miner. Metall. Mater., 29(2022), No. 10, pp. 1908-1921. https://doi.org/10.1007/s12613-022-2487-3

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研究论文

工业铁矿石球团的氢基直接还原：统计设计实验与计算模拟

1)
Chemical Systems Engineering Center, Department of Chemical Engineering, University of São Paulo, São Paulo 05508-900, Brazil
2)
Metallurgical Process Laboratory, Institute of Technological Research, São Paulo 05508-901, Brazil

通讯作者:
Patrícia Metolina E-mail: pmetolina@usp.br

中文摘要

氢基直接还原还原被认为是减少炼钢行业人为 CO₂ 排放的重要发展方向之一，本文使用 Doehlert 实验设计研究了工业生产的赤铁矿球团与 H₂ 的直接还原，以评估球团直径 (10.5–16.5 mm)、孔隙率 (0.36–0.44) 和温度 (600–1200°C)的影响。观察到温度和颗粒大小之间的强烈交互作用，表明这些变量不能独立考虑。温度的升高和颗粒尺寸的减小有利于降低率，而孔隙率没有显示出相关的影响。还原过程中粒料尺寸的变化可以忽略不计，除非是在高温下由于裂纹形成，才会产生较大的尺寸变化。高温下机械强度的显着降低表明了氢基直接还原直接还原工艺操作最高温度为 900°C。本文使用改进的晶粒模型来模拟三个连续的非催化气固反应，同时考虑到了不同的颗粒尺寸和孔隙率，以及在 800 到 900°C 的反应过程中的变化，实现了良好的预测能力。然而，对于其他温度，在建模中还必须考虑不同的结构变化机理。这些结果对开发用于无二氧化碳炼钢技术的球团矿做出了重大贡献。

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Research Article

Hydrogen-based direct reduction of industrial iron ore pellets: Statistically designed experiments and computational simulation

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Abstract

Abstract

As part of efforts to reduce anthropogenic CO₂ emissions by the steelmaking industry, this study investigated the direct reduction of industrially produced hematite pellets with H₂ using the Doehlert experimental design to evaluate the effect of pellet diameter (10.5–16.5 mm), porosity (0.36–0.44), and temperature (600–1200°C). A strong interactive effect between temperature and pellet size was observed, indicating that these variables cannot be considered independently. The increase in temperature and decrease in pellet size considerably favor the reduction rate, while porosity did not show a relevant effect. The change in pellet size during the reduction was negligible, except at elevated temperatures due to crack formation. A considerable decrease in mechanical strength at high temperatures suggests a maximum process operating temperature of 900°C. Good predictive capacity was achieved using the modified grain model to simulate the three consecutive non-catalytic gas–solid reactions, considering different pellet sizes and porosities, changes during the reaction from 800 to 900°C. However, for other temperatures, different mechanisms of structural modifications must be considered in the modeling. These results represent significant contributions to the development of ore pellets for CO₂-free steelmaking technology.
- hydrogen use;
- non-catalytic gas–solid reaction;
- grain model;
- porous hematite pellet;
- CO₂ emissions reduction;
- Doehlert experimental design

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