Effect of Coke Micro-Textural and Coal Petrographic Properties on Coke Strength Characteristics
Effect of Coke Micro-Textural and Coal Petrographic Properties on Coke Strength Characteristics
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DOI：
10.2355/isijinternational.45.1820
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发表时间：
2005-12
影响因子：
1.8
通讯作者：
R. Sharma;P. S. Dash;P. Banerjee;Deepak Kumar
中科院分区：
文献类型：
--
作者：
R. Sharma;P. S. Dash;P. Banerjee;Deepak Kumar
焦炭质构是高炉焦炭最重要的品质因素。当焦炭在高炉中下降时，它应该保持基本相同的形状，但事实并非如此。在焦炭中，其强度与其微观结构和质地有关。煤的碳化导致焦炭的发展，焦炭表现出各种微观结构，其在偏振光中的光学行为有助于表征它们。光学显微镜为测量这些特征提供了最合适的方法。本研究使用了9个不同配煤焦样(湿堆密度1.15tm~(-3))，对挥发分在23.4~24.6%范围内的捣固焦炭进行了微观结构分析，通过微观结构预测焦炭强度，并建立镜质组分布-焦炭结构关系的可能性。结果表明，焦炭中各向同性碳所占比例较大，各向异性碳的大小不同。与各向同性碳相比，各向异性碳对二氧化碳的反应活性较小，反应后的强度取决于其各向异性织构。随着各向同性碳含量的增加，M10指数变差，焦炭反应活性指数增大。在这项研究中还发现，上述所有碳形态与镜质组分布的相关性都不好，因此可以说，微观岩相参数通常不足以表示焦炭的决定性性质，因为焦炭的微观结构和结构被认为是控制和改善焦炭物理性质的首要因素。
Coke texture is most important quality factor of blast furnace coke. A coke, as descends in blast furnace, it should retain essentially the same shape but is not true. In coke, its strength is associated with the microstructure and texture. The carbonization of coals leads to the development of coke that exhibits a variety of microscopic textures whose optical behavior in polarized light aids in their characterization. The optical microscope provides the most appropriate method for measuring these features. In this study nine coke samples of different coal blend made by stamp charging technology (Wet Bulk density 1.15tm-3) were used and an attempt has been made to examine the microtexture of stamp charged coke in range of 23.4 to 24.6% volatile matter to predict coke strength by microtexture and possibilities of establishing vitrinite distribution-coke texture relationship, if any. Results indicate that cokes contain significant proportion of isotropic carbon and different size of anisotropic carbon. Anisotropic carbon is less reactive to carbon dioxide compared to isotropic carbon and the strength after reaction depends on its anisotropic texture. With an increase in isotropic carbon M10 index deteriorates and coke reactivity index increases. In this study it was also found that all the carbon forms mentioned do not correlate well with vitrinite distribution and hence, it can be stated that micro petrographic parameters are generally not sufficient for expressing decisive properties of coke; since, coke microstructure and texture has been recognized to be of prime importance in controlling and improving the physical properties of coke.