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试验充分利用山西地区炼焦煤资源特点,采用7.63m焦炉制备了4350m^3特大型高炉应用的高质量焦炭。研究了单种煤常规煤质指标、煤岩参数与相应40kg焦炉焦炭质量的关系,探讨了5种炼焦煤煤岩参数等与40kg焦炉所炼焦炭冷态和热态强度。结果表明,在配合煤最大镜质组平均反射率约为1.34、活惰比约为1.7-1.8时,40kg焦炉所炼焦炭的M40和M10分别达到84%和6%左右,热态性能CRI和CSR分别达到19%和72%左右,并在7.63m超大容积焦炉上进行了相关工业实验研究。 相似文献
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焦炭中的灰分作为高炉冶炼过程中的有害成分,其全部来源于配合煤,配合煤的粘结指数可以反映其粘结性和结焦性,对焦炭质量具有重要的影响。统计某焦化厂配合煤的灰分、粘结指数及焦炭的热性质和冷强度,对配合煤灰分、粘结指数对焦炭质量的影响进行了分析研究。结果表明:配合煤灰分与焦炭的抗碎强度(M40)和反应后强度(CSR)呈负相关关系,与焦炭的耐磨强度(M10)和反应性(CRI)呈正相关关系;粘结指数与M40和CSR呈正相关关系,与M10和CRI呈负相关关系。研究分析灰分及粘结指数对焦炭质量的影响,有利于指导生产。 相似文献
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选取了鞍钢化工总厂常用的4种炼焦煤和神木长焰煤为实验煤种,采用2kg室式实验焦炉分别对单种煤和配合煤在三种堆密度下炼焦,所得焦炭按GB1997-89测定其反应性(CRI)和反应后强度(CSR).旨在寻求不同堆密度炼焦对焦炭热性能和长焰煤对捣固炼焦焦炭热性能的影响规律.结果表明:单种煤、配合煤炼焦的焦炭CRI都随着炼焦煤堆密度的增加而降低,CSR则提高;添加长焰煤炼焦对焦炭的CRI、CSR的总趋势是长焰煤配比越高则焦炭CRI越高,而CSR越低;但通过提高堆密度的方式炼焦,可以减小低阶煤对焦炭CRI和CSR的劣化. 相似文献
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为了改善焦炭质量,降低配煤成本,鞍钢鲅鱼圈利用测定煤显微结构的镜质组反射率,并将其绘制成分布图的煤岩学方法监控来煤质量,建立了本企业的煤岩配煤方法,开展煤岩配煤的应用研究,有效地杜绝了复杂混煤入厂,优化了配煤结构,提高了焦炭质量。结果表明,应用该技术后鲅鱼圈焦炭的冷态性能M40、M10、热态性能CRI、CSR提高明显,分别从2011年的88.11%、6.75%、27.36%、62.20%,逐步改善到2014年的88.88%、6.26%、23.89%、66.26%,主焦煤配比从2011年的75%下降到目前的69%。 相似文献
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为了降低焦炭成本、减少主焦煤、增加低价气煤在配合煤中的用量,以2种气煤、2种肥煤、2种焦煤、1种瘦煤和1种自主研发的煤粉改质剂为原料,在2 kg实验室炼焦炉上开展了大比例气煤改质炼焦试验。试验结果表明,当主焦煤配比低于50%,气煤配比达到35%时,所炼制焦炭的质量指标将急剧恶化,其反应性(CRI)大于36%,反应后强度(CSR)低于50%,不能满足中、大型高炉顺行需求;但在改质剂的作用下,使用气煤逐步替代主焦煤炼焦时,所炼制改质焦炭的热态强度指标均得到显著改善,尽管配合煤中气煤配比提升到45%,主焦煤配比降到40%,仍能生产CRI小于30%,CSR大于58%的改质焦炭。结合SEM、XRD和Raman检测分析焦炭微观层面的差异,结果表明,在炼焦配合煤中添加大剂量气煤,会增加焦炭气孔的数量和尺寸以及无定型碳含量,同时降低焦炭微晶单元的体积和致密度,导致焦炭反应性增加,反应后强度降低;添加改质剂后,上述现象在改质焦炭中可得到显著改善,并且高比例气煤添加下所炼制改质焦炭微观结构和组分的分布可达到高比例主焦煤配加下所炼制生产焦炭的水平。最后,通过工业性试验验证了在改质剂的作用下向炼焦配合煤中添加45%气煤生产优质冶金焦炭是可行的,找到了一种节约主焦煤、降低炼焦配煤成本的新方法。 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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提高焦炭质量的生产实践 总被引:1,自引:1,他引:0
针对唐山中润煤化工有限公司来煤混煤严重的情况,采用岩相分析与常规分析相结合的方法,加强煤场管理及过程控制,利用小焦炉优化配煤,提高炼焦操作水平,使焦炭质量得到提高。 相似文献
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Coke is used as a reducing agent in the production of ferrochromium in a submerged arc furnace (SAF). Its good electrical conductivity compared to other input materials makes it a dominant current conductivity substance in the burden. The resistance of the coke has to be high enough to ensure the proper functionality of the furnace. Used cokes for submerged arc furnace production are relatively small in size compared to e.g blast furnace (BF) cokes. A common practice is to use screening residual coke, which is too small for the BF, in SAF. The goal of this study was to show differences in the electrical properties of screening residual cokes compared to coke formed in different parts of the coke battery, in dependence of particle size. The resistances of different cokes were measured and XRD measurements were performed to define the crystallographic structure of the selected cokes. The results indicate that small coke particles have higher overall resistance, which is due to their internal properties. This small weakly carbonized coke is formed in the middle of the coking battery and is subject to changes in varying coking practices. Continuous quality control of screening residual coke is needed to use it in the SAF. 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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Coke microtexture and microstructure is a function of feed coal composition and carbonisation process. If the process remains constant, the composition plays a vital role in developing the microtexture and microstructure which also reflects the coke quality. Knowledge of the influence of coal composition and characteristics on coke quality is a must for formulating a coal blend for coke making. To better understand how the coal transforms into coke requires the ability to correlate the microtextural and microstructural features to coal properties. Petrography is an important tool for comparing the feed coal and corresponding coke. In the present study, cokes manufactured from single coals and two-component blends under similar coking conditions were studied under the microscope to provide valuable information to coke makers. Not only the rank and quantification of macerals but also the association of macerals and minerals play an important role. Also the size and type of inertinite affect the coke quality. Micro-cracking, crack lengths and fissures identify the zone of weakness, whereas microtexture of cell walls suggests the strength-controlling parameters of coke. Pictorial concept followed in the present study is given below: 相似文献