共查询到18条相似文献,搜索用时 546 毫秒
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《煤化工》2019,(6)
鉴于优质焦煤资源短缺,高硫焦煤配煤炼焦备受关注。在实验室模拟炼焦条件下,对山西兑镇和柳林地区7个批次的高硫焦煤的炼焦特性及煤岩组分进行分析,探究高硫焦煤的结焦性能;同时考察了不黏煤、弱黏煤等低黏煤在配煤炼焦中的影响。实验结果显示:与柳林高硫煤相比,兑镇高硫煤单种煤焦的冷强度较高,热强度较低;在配煤炼焦时,兑镇配煤焦的冷强度多数低于柳林配煤焦,但其热强度优于柳林配煤焦,如柳林3配煤焦的M_3为4.02%,M_(13)为94.66%,而CRI*为43.20%,CSR*为69.13%;配入低黏煤可改善焦炭耐磨性和抗碎性,同比例添加条件下,配弱黏煤焦炭质量优于配不黏煤焦炭质量。 相似文献
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捣固炼焦值得关注的几个问题 总被引:3,自引:0,他引:3
叙述了捣同炼焦配煤与焦炭质量的关系及捣固强度与配煤的关联性.指出:焦炭质量的基础是配煤质量,不会因煤准备和炼焦工艺等有根本性的改变;捣固炼焦可多用低变质程度,高挥发分气煤类的炼焦煤生产出一定质量的焦炭;捣同炼焦配煤适当增加黏结性配煤比例可提高焦炭质量,但用接近顶装焦炉的配煤进行捣固炼焦将丧失其优势并引发问题.捣固焦炉的... 相似文献
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为提出适合鞍钢鲅鱼圈分公司的炼焦用煤结构,利用全自动智能型煤岩分析系统分析了鞍钢鲅鱼圈所用不同牌号各炼焦煤的煤岩特征,结合传统炼焦煤煤质指标,对各炼焦煤的煤质特征进行评价,并将煤岩学应用于炼焦配煤煤种调整、配比调整中。结果表明,根据煤岩分类标准,鞍钢鲅鱼圈所用焦煤中含焦煤成分60.2%,肥煤成分31.6%;鲅鱼圈所用炼焦煤中,进口煤煤质较为单一、煤质较好,其中60%以上为单一煤层煤,而国内煤的混煤现象较为严重,单一煤层煤不足20%。煤岩学理论应用于鞍钢鲅鱼圈炼焦生产后,在炼焦煤评价中增加了煤岩学指标,扩大了精煤来源,提高了焦炭质量,焦炭抗碎强度M_(40)从2011年的88.11%提高到2013年的88.87%,焦炭耐磨强度M_(10)从2011年的6.75%降低到2013年的6.38%。 相似文献
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通过建设和应用配煤炼焦生产在线管理平台,将配煤计算、铁箱/小焦炉试验和实际炼焦生产紧密结合,规范了配煤方案审批过程,对实现科学配煤、保证焦炭质量、降低配煤成本起到了重要的作用。 相似文献
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炼焦机理和焦炭质量预测的研究进展 总被引:2,自引:0,他引:2
综述了煤的热塑性、炼焦机理和焦炭质量预测的研究进展。煤的化学结构如煤中镜质组的烷基侧链和移动氢的含量决定了煤的热塑性,核磁共振、质子磁共振热分析、拉曼光谱和电子顺磁共振谱等从分子水平解释煤的热塑性、配合煤的相互作用和炼焦机理。塑性成焦机理认为,良好的氢传递和分子重排是炼焦中获得优质焦炭的重要条件,塑性成分在焦炭光学组织形成中非常关键,改变加热速率可使煤的光学组织形成机理改变。碱度指数(modified basicity index,MBI)、复合焦势(composite coking potential,CCP)和组合煤指数(combined coal index,CCI)等参数可精确地预测焦炭反应后强度和焦炭反应性。矿物质对焦炭强度的影响是研究热点,控制焦炭的裂纹和尺寸是未来焦炭质量的要求。 相似文献
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An approach to blast furnace coke quality prediction 总被引:3,自引:0,他引:3
Although coke cold drum mechanical strength has historically been the most relevant coke quality parameter, currently coke reactivity and post-reaction strength (CRI/CSR) are the most important parameters used to assess blast-furnace coke quality. Many models of coke quality prediction have been proposed, most of which are based on coal characteristics and limited to the same coal geographic origin, but as yet there is no universally applicable prediction formula. The present work describes a simple model of coke CRI/CSR prediction based on the assumption that the CSR of a coke produced from a blend of coals can be predicted from the CSR obtained from the cokes of the individual coals through the application of the additivity law. The additivity law was also applied to the coke cold mechanical strength indices derived from the Irsid test, which are widely employed by the European coke industry as complementary coke quality indicators. 相似文献
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S. K. Das A. S. Nandy A. Paul B. K. Sahoo B. Chakraborty A. Das 《Coke and Chemistry》2013,56(4):126-136
A by-product coke making plant is required to supply sufficient coke of good quality and adequate gas of high calorific value for the integrated steel plant to be a going concern. The one element that influences the handling of coal and impacts the operation and efficiency of the plant is moisture. Compared to other important properties of the coal blend, moisture can be easily manipulated. The coal moisture can be increased simply by adding water through hose pipes. Also, it can be reduced to 5–6 mass percent using Coal Moisture Control (CMC) and 2–4 mass percent using Dry-cleaned & Agglomerated Pre-compaction System (DAPS). Moisture content is one among the many variables affecting the bulk density of coal blend and those controlling the coke qualities and yield. Increase in moisture reduces coal grindability, coking pressure and internal gas pressure; helps in dust suppression during charging and hence reduces jamming of ascension pipes and hydraulic main. Batteries charging coals with high moisture content are not troubled with roof carbon deposits. It was observed that when moisture content in coal blend of SAIL-Bokaro Steel Plant increased to more than 8.50%, the calorific value of coke oven gas improved. In the working moisture range of 9–11%, the increase of the yield of coke oven gas per 1% of working moisture is 5.2 m3. Studies have shown, however, that the increase in moisture content of coal beyond 8% hampers strong coke formation. Pre-carbonization preheating process generally showed an increase in the proportion of 40–80 mm coke, compared with wet charges. For SAILBokaro coke ovens, driving out 1% moisture from coal blend requires 125 Mega-calories of heat/oven. With lesser moisture, the emission of NO x in atmosphere will also be low. On using dry to low moisture coal blend, the swelling of coke mass increases leading to difficulty in oven pushings. Hence, an optimum level of moisture content of charge coal needs to be maintained for improving coke oven productivity, coke quality and operational smoothness. The coke oven managers all around the globe maintain this optimum level according to their requirement, the operating conditions, the quality of product and by products, the oven health & age and the ease of handling. 相似文献
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针对济钢焦化厂6#、7#焦炉焦炭M40下降约2%,相关部门对槽内煤质、配煤准确度、焦炉热工操作及配煤指标等系统进行了排查,确认了配用的瘦煤G值低导致配合煤黏结性不足是本次波动的主要原因。通过调整配煤结构、提高配合煤黏结性、延长结焦时间等措施,使焦炭质量恢复到M40 84.0%的正常水平。并提出要建立焦炭质量波动预警机制,提高焦炭质量过程控制能力,加强操作、管理水平,以确保高炉生产顺利进行。 相似文献
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The coal blend quality and process control of coke making technologies is an important lever to produce quality coke with optimal cost. Apart from impacting cost, this improves the CO2 footprint. This is facilitated by proper selection of coke making technologies and coal/coal blend. Each technology has its own advantage and limitation based on its design criteria. Recently, Tata Steel introduced Asia largest single location 1.6 mtpa of heat recovery coke plant for the first time. This paper briefly described the operational philosophy evolved in heat recovery coke plant to produce desired quality coke at comparatively lower cost through operational excellence. The reduction of imported prime hard coking coal in coal blend up to 30% without affecting coke quality adversly and understanding the operational processes and finally mastering heat recovery coke making technology was also part of this paper. 相似文献
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通过20kg小焦炉实验,探讨了在相同炼焦温度和同一配煤比条件下,结焦时间对焦炭质量的影响。结果显示,适当延长结焦时间能有效地提高焦炭的抗碎强度和反应后强度,而焦炭的耐磨强度和反应性明显降低,并从微观角度解释了焦炭质量变化的原因。建议在生产条件允许的情况下,应适当延长结焦时间,可以改善焦炭的冷热态强度。 相似文献