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采用热态可视化流化床装置研究了铁精粉流态化还原过程,描述了流化床粘结失流过程的一些宏观表现和颗粒的微观变化。研究发现,失流后不同还原剂引起的料层膨胀程度明显不同,例如用H2作还原剂时料层膨胀40%左右,而用CO时膨胀会达到82%,而且颗粒间的粘结强度也与还原剂的种类有关。同时,适当降低还原温度可以延缓失流的发生也得到了验证,而且CO比H2更为明显。微观上发现这些差异皆与不同还原剂引起的铁晶体不同形态有关。
The fluidized reduction process of iron ore powder was studied by using the thermal visualized fluidized bed unit. Some macroscopic behaviors and microscopic changes of the fluidized bed during the process of the cementitious fluidized bed were described. It is found that the degree of swelling of the material layer caused by different reducing agents after the loss of flow is obviously different. For example, when H2 is used as the reducing agent, the material layer expands by about 40%, while when CO is used, it expands by 82% and the bonding strength between the particles And the type of reducing agent. At the same time, the proper reduction of the reduction temperature can delay the occurrence of delamination has also been verified, and CO is more obvious than H2. These differences are found microscopically with different reductants caused by different forms of iron crystals.