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针对迁安中化炼焦煤采用常规煤质指标分析出现的单种煤常规指标较好,配煤炼焦后焦炭强度下降的问题,采用基氏流动度分析了常用两种中强黏结性炼焦煤A煤和B煤的煤质,探讨了其与常规煤质指标的关系,介绍了基氏流动度在配煤炼焦中的应用情况及存在问题。结果发现,A煤和B煤的常规煤质指标接近,最大基氏流动度分别为7209 ddpm和829 ddpm,可以较好区分两种煤;基氏流动度特征指标中的软化温度、塑性温度区间及最大流动度可反映炼焦煤的基本性质;炼焦煤的最大流动度的对数值在2.2~3.0、挥发分在23%~27%时,焦炭M40>87%、M10<7%。 相似文献
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以鸡西地区3种原煤为试验对象进行浮沉试验,结果表明:当特征灰分为11%时,主焦煤为难选煤,1/3焦煤为中等可选煤,肥煤为极难选煤。基于各煤样单独洗选后的煤质指标,以炼焦煤煤质要求和3种精煤煤质指标为约束条件,以配煤成本最低为目标函数,建立线性规划数学模型,得到成本最低时3种煤的最佳配比为:18%主焦煤,32%1/3焦煤,50%肥煤。将煤样按上述比例混合后进行浮沉试验,并对洗选后的混煤进行煤质分析,结果表明:当特征灰分为11%时,配煤为较难选煤,明显改善了煤的可选性;配煤洗选后各煤质指标的实际值与理论值相差较小,无显著性差异,且精煤各项指标均符合炼焦煤煤质要求。因此采用线性规划法进行配煤入选可行,对炼焦煤选煤厂具有一定的借鉴意义。 相似文献
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为提高炼焦煤质量评价的准确性,从炼焦煤的可选性、化学特征、工艺性质、煤岩特征、煤质牌号的确定、煤质资料汇编、煤质评价专家系统七方面分析了炼焦煤质量评价方法。针对目前炼焦煤质量评价中存在的问题,提出应通过提高煤质评价专家系统的准确性、加强煤岩参数在煤质评价中的应用、规范采制样操作、加强数据统计的应用、提高仪器设备的标准化水平等措施提高炼焦煤煤质评价的准确性。只有规范实验室各环节,强化实验室管理,加强煤岩参数在煤质评价中的应用,提高煤质专家系统的准确性,才能正确指导配煤炼焦,确保炼焦煤的合理利用和焦炭质量全面稳定提升。 相似文献
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研究了7种单煤焦和1种配煤焦不同层次强度的影响因素。在焦炭显微特征中,影响因素较大的是焦炭平均壁厚B和光学各向异性指数H1。显微强度直接受焦炭孔壁的光学组织组成影响;结构强度受气孔率P和B影响较大;M40、M10主要取决于B和H1;CSR除受孔壁的厚度和孔壁的光学组成影响外,还与灰成分关系密切。对煤岩煤质指标参数影响较大的是炼焦煤的Rmax、S、∑I和G。 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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介绍了我国无烟煤、贫煤、不黏煤和长焰煤等非炼焦煤的性质及在炼焦生产中的应用情况。利用非炼焦煤代替部分焦煤炼焦,成本优势十分明显,既可缓解焦煤资源不足的压力,还能优化我国煤炭资源的利用。 相似文献
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大同侏罗纪10—11#煤煤质特征及其控制因素 总被引:1,自引:0,他引:1
研究了大同10-11#煤的变质程度和煤岩特征,指出高含量的丝质组是大同10-11#煤最主要的煤岩特征,分析了大同10-11#煤煤类、化学和工艺性质与其沉积环境和变质程度的关系,探讨了大同10-11#煤煤质特征及其成因因素,提出了煤炭分选技术是扩大大同煤利用途径的有效手段,为大同煤的合理利用提供了理论基础。 相似文献
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在融碱法和高压液减法脱灰的基础上,研究了煤的常压液碱法脱灰。考察了碱煤比、反应温度、时间、粒度组成等对两种煤脱灰的影响,并对脱灰机理作了初步分析。 相似文献
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国内煤化工的现状及发展 总被引:2,自引:0,他引:2
介绍了国内煤化工行业的现状,详细介绍了煤制油、煤制烯烃、煤制天然气、煤制乙二醇、煤制芳烃项日的技术、经济情况,指出通过开发下游产品,合理利用CO2来改善产品单一、节能减排压力大问题。 相似文献
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Steps are now being taken to define in more detail the phenomenology of coal liquefaction and to provide a scientific basis for empirical correlations previously established between liquefaction conversion and basic compositional characteristics of coals. The rates of production of oils, asphaltenes and preaphaltenes have been determined at four temperatures for three coals, two of Carboniferous and one of Creaceousage. Products are formed more slowly from the younger coal (which is of slightly lower rank) than from the others, but oxygen, partly as OH but probably mostly in a type of ether, is lost more rapidly. It is estimated that the maximum content of O as cleavable ether is 7.7 atoms/100 C atoms for the younger coal (from Wyoming) and 4.1 and 5.1 for the other two (from Oklahoma and Ohio, respectively). Until ≈ 50% of the amount present in the Oklahoma coal is lost, the rates of removal of oxygen and organic sulphur are approximately equal; beyond this level, the removal of S is more rapid. The loss of organic sulphur from the Ohio coal is slightly faster. Even so, the data do not support the idea that cleavage of thioethers is more rapid than that of ethers and that this is the basic reason why a high organic sulphur content tends to promote liquefaction. Conversion of the pyrite in the Ohio coal to pyrrhotite occurs considerably more rapidly than the pyrite in the Oklahoma coal. In preliminary experiments, it is shown that a curve-resolving programme allows two aromatic and five aliphatic C-H stretching vibrations to be distinguished in FTIR spectra of the hexane-insoluble products, and the distribution changes with degree of conversion. In particular, there is evidence that new aryl methyl are generated during liquefaction, in agreement with evidence from oxidation studies. 相似文献
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The e.p.r. and i.r. spectra of hand-picked samples of calcite from Pittsburgh No. 8 coal, show that it contains the Mn2+ paramagnetic ion and clay minerals as impurities. Furthermore, comparison of the e.p.r. spectra of hand-picked and natural calcite shows that the Mn2+ spectrum in this coal originates from calcite, which when diluted in KBr or coal produces a spectrum similar to that reported by other investigators. The results obtained when coal-derived calcite was treated with dilute H2SO4 and HCI rules out the possibility that the Mn2+ originates from the pyrite or clays present in the coal. 相似文献
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