南钢焦炭质量预测模型研究

基于南钢产业发展有限公司配煤炼焦实际生产数据,借助逐步回归法进行数据的分析与处理,建立了适合其自身特点的焦炭质量预测模型,经显著性检验以及预测结果分析,所建立的焦炭质量预测模型能够预测和控制焦炭质量,为优化配煤结构、降低生产成本奠定了理论基础。     

高硫焦煤和非主炼焦煤在配煤炼焦中的作用研究

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。     

微观分析技术在优选炼焦煤中的应用

邯钢焦化厂通过煤岩显微组分分析和焦炭光学组织含量分析的研究和应用,和小焦炉试验有机结合,建立了焦炭热强度和焦炭光学组织、焦炭光学组织和煤岩显微组分之间的模型,能够根据煤的显微组分判断所产焦炭的质量,科学地指导配煤炼焦生产,从而达到准确预测焦炭质量,优选炼焦煤种,最大限度地降低配煤炼焦成本的目标。     

捣固炼焦值得关注的几个问题

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...     

焦炭机械强度预测模型的研究

焦炭机械强度是焦炭质量的重要指标,建立准确的焦炭机械强度预测模型可保证炼焦生产顺利进行.把支持向量回归机用于焦炭机械强度的预测,详细地分析了不同配煤煤质特性指标及炼焦工艺指标情况下的预测效果,找到了建立预测模型的有效特征参数.基于所选特征参数,当85≤M25≤90,6≤M10≤12时,支持向量机模型的预测准确率高,误差小,相关性强,同时,预测模型的泛化能力强.     

焦油渣在配煤炼焦中应用

随着我国钢铁产量的增加,炼铁用焦炭的需求量也大大增加。改进炼焦技术,提高焦炭产量刻不容缓。用于炼焦的煤种类很多,配煤炼焦技术是指炼焦时采用多种煤搭配使用,协同炼焦,不但可以保证焦炭生产质量,也可以节省优质炼焦用煤。不仅如此,对配煤炼焦技术的改进可以进一步节省优质炼焦煤,降低炼焦成本。通过焦油渣作为添加剂对配煤炼焦技术的探究,在对配煤炼焦技术进行说明的同时,阐述了如何通过改进配煤炼焦技术来提高我国焦炭生产质量,对促进我国现代化建设以及节约化石资源都有十分重要的意义。     

捣固焦炭质量的改善与入炉煤性质的关系

通过配煤炼焦试验,研究了捣固炼焦相对于常规炼焦其焦炭质量改善效果与入炉煤性质的关系,进而建立了捣固焦炭质量改善效果与入炉煤性质参数的数学关系;在此数学关系的基础上,探讨了捣固炼焦改善焦炭质量的入炉煤性质范围。     

基于煤显微结构的炼焦用煤评价及应用

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%。     

配煤炼焦生产在线管理平台的应用

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。     

提高焦炭质量及降低炼焦生产成本的有效途径

通过综合分析湘潭煤制气厂炼焦生产具体情况 ,认为该厂炼焦生产的配煤比极不合理 ,致使焦炭质量不合格、炼焦生产成本较高。选择 40 kg实验焦炉模拟 6 6 - 型焦炉进行炼焦实验 ,得出 40 kg实验焦炉与 6 6 - 型焦炉的炼焦生产有很好的相关性 ,并以此寻求出了经济配煤比 ,从而达到了提高焦炭质量及降低炼焦生产成本的目的     

焦炭热性能的影响因素探讨

通过对梅山焦炭反应性、反应后强度和配煤质量指标进行的试验分析,结果表明:焦炭灰分、配煤挥发分和胶质层最大厚度Y值是影响焦炭热性能的重要因素,而焦炭的冷强度M40和M10与焦炭热性能没有明显的相关关系。     

An approach to blast furnace coke quality prediction

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.     

炼焦机理和焦炭质量预测的研究进展

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。     

Coal blend moisture—a boon or bane in cokemaking?

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.     

济钢焦化厂焦炭质量波动分析及应对措施

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。     

在配煤中添加石油焦对焦炭质量的影响

研究了在配煤中添加石油焦对焦炭质量的影响。采取配比为5%的不同粒度的添加方案进行配煤炼焦实验,最佳配煤方案与武钢生产配煤焦炭相比,灰分降低0.57%,硫分增加0.02%,抗碎强度基本不变,耐磨强度M10下降0.95%,反应性降低3.12%,反应后强度提高6.59%。焦炭的X-射线衍射对比测试表明,在配煤中加入石油焦能促进焦炭各向异性的发展。     

Heat recovery stamp charged coke making: An experience in operational excellence

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.     

结焦时间与焦炭质量关系的20kg小焦炉实验分析

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。