共查询到19条相似文献,搜索用时 234 毫秒
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为积极应对炼焦煤资源供应趋紧、质量下滑和价格波动等多变因素影响,河钢宣钢公司优化炼焦煤资源、配煤结构,深入市场探寻炼焦煤新资源,以小焦炉试验和煤岩分析为技术支撑,研究新资源的质量性能和各炼焦煤种的配入比例,开展配加王家岭瘦焦煤的多种配煤优选方案,在保证焦炭强度不降低的基础上,瘦煤配比提高至14%。通过对配合煤硫分和黏结指数的测算,扩大了炼焦煤资源,用普通焦煤代替部分高价低硫柳林类焦煤,降低了公司的配煤成本。 相似文献
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《钢铁冶炼》2013,40(6):416-420
AbstractThe blast furnace coke quality depends on the characteristics of coal blend, precarbonisation techniques adopted such as stamping, vibrocompaction etc., and coking conditions. Of the above, coal blend plays a significant role in the production of quality coke. Furthermore, the quality of the blend depends on the quality of individual coals and their interaction making up the blend. Coal, being a highly heterogeneous material, requires special care for determination of its properties and blending of individual coals for coke making. Coal fluidity is one such important coking property which highly influences the coke quality. The hard coking coals having good fluidity, which yield good coke, however are not only very expensive, but also are limited in reserves. Unlike, other properties, coal loses its fluidity on weathering, i.e. oxidation in presence of air on long storage in the yard, and the fluidity value changes on blending with different coals. To understand the effect of coal fluidity on coal blending and there by the coke quality, studies have been conducted using the industrial scale coals and coal blends. An empirical relation has been developed between actual blend fluidity and calculated fluidity using logarithmic weighted average from fluidity of individual coals. Blending of non-coking coals above 20% with the hard coking coals used in this research decreases the blend fluidity and impairs the coke quality. It was seen that the coals lose their fluidity on weathering, and the value becomes less than half after a two months of storage at site. Weathering appears to be more rapid in case of semisoft than hard coking coals. The present paper discusses the influence of coal fluidity on coal blend fluidity and changes on weathering. 相似文献
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炼焦煤灰分是决定其价格的重要因素,为比较同一矿点煤种灰分对结焦性质的影响规律,对各炼焦煤进行黏结性、煤岩特征、灰分等分析并进行40 kg试验焦炉炼焦试验分析。研究表明,不同煤种炼焦煤灰分降低对黏结性改善幅度不同,黏结性较好的炼焦煤当其灰分降低时,黏结性改善不明显;黏结性较差的炼焦煤当灰分降低时,其黏结性改善较为明显;且不同煤种炼焦煤灰分降低时灰组成变化规律不同。不同煤种炼焦煤灰分降低时所炼焦炭其强度变化程度不同,黏结性较好的炼焦煤,当其灰分降低,所炼焦炭强度变化幅度不大;黏结性较差的炼焦煤,当其灰分降低时,所炼焦炭强度改善较大。 相似文献
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随着煤岩测定技术的进步,炼焦煤的煤岩性质已在炼焦配煤中得到广泛应用。通过对多种单种煤和配合煤的煤岩特征以及对应的40 kg试验焦炉所炼焦炭的性质进行分析和比较,结果表明:单煤种的R0max在1.3%~15%间,所炼制焦炭的冷态机械强度(M40和M10)最好,其热性质(反应性CRI和反应后强度CSR)也较好;配合煤反射率分布图特征越接近正态分布,则所炼制的焦炭冷态机械强度(M40、M10)就较好,配合煤反射率分布图特征偏离正态分布越远,其焦炭热性质越差;40 kg试验焦炉所得焦炭的反应性CRI高,其反应后强度CSR较低,存在负相关线形关系。 相似文献
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焦炭微晶结构特性研究 总被引:7,自引:0,他引:7
选取23个单种煤进行了焦炭性能的影响因素研究,在20 kg试验焦炉中进行炼焦试验,并进行焦炭质量分析试验.通过23个单种煤焦炭的X射线衍射图,计算焦炭微晶结构参数,研究焦炭微晶结构特性与焦炭宏观性能关系.结果表明:焦炭气孔壁最基本单元--微晶结构是影响焦炭宏观性能的最本质因素.焦炭微晶结构与炼焦煤的煤化度关系密切,致密度和单元大小在煤岩镜质组反射率Rr为1.2%左右达到最大值. 相似文献
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The maximum possibility of utilizing the Indian coking coals and inferior grade coking coal for producing metallurgical coke through non-recovery stamp charging technology was investigated.Indian indigenous coals contained low percent of vitrinite(50%)and higher content of ash(15%)compared to imported coking coal.Therefore,the selection of appropriate proportion of different types of coals was a major challenge for coke makers.Coal blend selection criterion based on a single coefficient,named as composite coking potential(CCP),was developed.The use of increased proportion of semi-soft coal(crucible swelling number of 2.5)and high ash(≥15%)indigenous coal in the range of 20%-35%and 20%-65%respectively in the blends resulted in good quality of coke.Plant data of a non-recovery coke oven were used for developing and validating the model.The results showed that the coke strength after reaction(CSR)varied in the range of 63.7%-67.7%and the M40value was between 81.8and 89.3in both the cases. 相似文献
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介绍了国内部分地区10种炼焦煤及6种澳洲煤的特性,通过对镜质组平均最大反射率、岩相组成、硫含量、磷含量、灰成分催化系数、流动度、奥亚膨胀度等单种煤性质的测定及单种煤炼焦试验,对比澳洲煤与国内煤差异,通过比较发现,对焦炭质量有积极贡献的指标澳洲煤大多优于国内煤。 相似文献