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首页> 外文会议>The 4th Australia-China-Japan joint symposium on iron and steelmaking >Nondestructive Analysis of Coke with/without Iron Catalyst Using μ-X-ray CT
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Nondestructive Analysis of Coke with/without Iron Catalyst Using μ-X-ray CT

机译：使用μ-X射线CT对有/无铁催化剂的焦炭进行无损分析

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The performance of coke in blast furnace (BF)used to prefer a high strength and low reactivity,generally.One of the reasons is in the importance of gas and liquid permeability in the lower part of BF,which are related to the stable operation of BF.On the other hand,the energy saving in the BF process will contribute the decrease of CO2 emission,because the proportion of CO2 emission in the ironmaking field is quite large.To decrease the reducing agent ratio the reaction efficiency in the BF should increase more and more.It is recognized that the reactivity and the strength of coke contradict each other.The high reactivity coke generally has a low strength.To overcome the contradiction,the use the catalyst on the coke gasification will be effective.Since the gasification reaction occurs on the surface of inner wall of pore,the change of pore structure should be clarified.In this study,the coke structures before and after gasification were analyzed using μ-X-ray CT (Computer Tomograph).The optimum conditions for the image processing of data from the μ-X-ray CT were elucidated through the comparison with the image of cross section of coke using an optical microscope,which was embedded in the resin with a fluorescent agent.It was found that a nondestructive observation of coke using μ-X-ray CT was possible.In the case of no addition of iron catalyst,relatively larger structure(～0.5mm) was almost the same between the μ-X-ray CT and the optical microstructure,however,the smaller structure less than 0.5mm could not be observed appropriately.The causes of the discrepancy were come both from μ-X-ray CT and optical microscope observations.The μ-X-ray CT has a lower image resolution in comparison with optical microscope,on the other hand,the plane of cross section for the observation of optical microscope had a lower flatness because of the problem of polishing technique.In the case of iron catalyst addition,the resolution of μ-X-ray CT decreased significantly with the increase of catalyst addition.To overcome this problem,the higher intensity of X-ray will be necessary.Although the observation by μ-X-ray CT has some limit,a macroscopic observation before and after gasification can be performed appropriately.The nondestructive analysis of coke before and after gasification was carried out and the structure change after gasification was elucidated.
机译：通常，高炉中焦炭的性能通常偏向于高强度和低反应性。原因之一是高炉下部的气体和液体渗透性的重要性，这与高炉的稳定运行有关。另一方面，高炉过程中的节能将有助于减少CO2排放，因为炼铁领域中的CO2排放比例相当大。要降低还原剂比例，应提高高炉中的反应效率人们越来越认识到焦炭的反应性和强度相互矛盾。高反应性的焦炭通常具有较低的强度。为了克服矛盾，在焦炭气化中使用催化剂是有效的。由于气化反应本研究利用μ-X射线CT（计算机断层扫描仪）分析气化前后的焦炭结构。通过与光学显微镜的焦炭横截面图像进行比较，阐明了μ-X射线CT数据的图像处理的最佳条件，该光学显微镜被嵌入有荧光剂的树脂中。使用X射线CT进行焦炭的无损观察是可能的。在不添加铁催化剂的情况下，X射线CT与光学显微组织的相对较大的结构（〜0.5mm）几乎相同，然而，小于0.5mm的较小结构无法适当观察到。造成这种差异的原因既来自μ-X射线CT和光学显微镜观察。μ-X射线CT的图像分辨率低于另一方面，由于抛光技术的问题，用于光学显微镜观察的横截面的平面度较低。在添加铁催化剂的情况下，μ-X射线CT的分辨率明显降低随着增加为了克服这个问题，需要更高强度的X射线。尽管通过μ-X射线CT进行观察有一定的局限性，但可以适当地进行气化前后的宏观观察。进行气化前后焦炭的变化，并阐明气化后的结构变化。

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