Direct reduction of iron ore/biomass composite pellets using simulated biomass-derived syngas: Experimental analysis and kinetic modelling
Direct reduction of iron ore/biomass composite pellets using simulated biomass-derived syngas: Experimental analysis and kinetic modelling
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DOI：
10.1016/j.cej.2017.06.118
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发表时间：
2017-11
影响因子：
15.1
通讯作者：
Dabin Guo;Yubiao Li;Baihui Cui;Zhihua Chen;Shipeng Luo;B. Xiao;Hongping Zhu;Mian Hu
中科院分区：
文献类型：
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作者：
Dabin Guo;Yubiao Li;Baihui Cui;Zhihua Chen;Shipeng Luo;B. Xiao;Hongping Zhu;Mian Hu
本文提出了一种新型环保的直接还原铁（DRI）生产技术，利用生物质作为铁矿球团添加剂，并以模拟生物质合成气作为还原剂。研究了生物质添加对铁矿球团还原的影响以及在模拟生物质衍生的合成气气氛中随后的还原动力学。结果表明，生物质的添加提高了颗粒的孔隙率和比表面积，从而提高了还原性和还原率，降低了颗粒还原的表观活化能。实验数据的数学模型表明以 FeO → Fe 作为速率控制步骤的界面化学反应机理。模拟生物质合成气是天然气、煤气的替代气体还原剂，氧化颗粒在1323 K下20分钟内还原率超过99.5%。添加和不添加生物质的颗粒的表观活化能为 86.05 kJ·mol−1、97.53 kJ·mol−1。因此，所提出的铁矿石还原工艺将具有直接利用生物质还原铁的潜力，具有高效率和真正的环境效益。
This paper presents a novel and environmentally friendly production of direct reduced iron (DRI) technology using biomass as an additive agent in iron ore pellets and simulated biomass-derived syngas as the reducing agent. The effects of biomass addition on iron ore pellets reduction and consequent reduction kinetics in simulated biomass-derived syngas atmosphere were investigated. The results demonstrated that the biomass addition improved the pellet porosity and specific surface area, thus increasing both the reducibility and reduction rate and decreasing the apparent activation energy for pellet reduction. Mathematical modelling of experimental data indicated an interfacial chemical reaction mechanism with FeO → Fe as the rate controlling step. The simulated biomass syngas is an alternative gas-based reductant to natural gas, coal gas, more than 99.5% reduction degree of the oxidized pellets was reduced at 1323 K within 20 min. The apparent activation energies were 86.05 kJ·mol−1, 97.53 kJ·mol−1for the pellets with and without biomass addition. The proposed iron ore reduction process therefore would be a potential to reduce iron directly using biomass with high efficiency and real environmental benefits.