Coupled Model of Chemical and Heat Transfer for Preparing Ultrafine Iron Powder by Carbon Thermal Reduction in Steel Strip Furnace
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摘要: 建立了钢带炉碳热反应制备超细铁粉的温度场及化学反应的耦合数学模型。模拟结果与相关试验吻合。物料温度分布接近中心对称分布,上、下温度高,中心温度低。还原分数与温度分布规律总体相似。超细铁粉对料层厚度很敏感,料层越薄,还原率越高,25 mm料层厚度,最终平均还原率可达90%,但35 mm的料层厚度最终还原率只有60%水平。延长反应时间能够改善还原效果,但是其影响程度低于料层厚度。Abstract: In this paper,a coupled mathematical model of temperature field and chemical reaction for producing ultrafine iron powder by carbon thermic reduction in a steel strip furnace is established.The simulation results are in good agreement with those of related experiments.Temperature distribution of material shows a a centrosymmetrical pattern. Temperature of upper and lower layer is higher than the center layer.The distribution law of reduction fraction is similar to the temperature distribution.The reduction degree of superfine iron powder is very sensitive to its thickness.The thinner the material layer,the higher the reduction degree.The average reduction degree of material with 25 mm thickness can reach 90%,while the material with 35 mm thickness is only 60% reduction degree.The reduction effect can be improved by prolonging the reaction time,but its effect on the reaction is smaller than the thickness.
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Key words:
- ultrafine iron powder /
- steel strip furnace /
- carbon thermal reduction /
- coupling model
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