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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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八钢焦化厂利用40kg试验焦炉,在气煤粉碎细度大于90%的基础上,1#气煤配入量为40%~50%时,焦炭M40为75.2%~76.0%;2#气煤配入量为50%时,焦炭M40为72.4%~77.6%。基于试验结果,对该配煤结构进行生产试验,焦炭质量与试验 相似文献
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为了改善原配合煤黏结性较差的实际情况,在配煤中配加一定量云南一平浪煤取代部分矿务局主焦煤和瘦煤。试验结果表明:配加10%的一平浪煤后,配合煤黏结性增强,焦炭反应性降低6.5%,反应后强度升高7.9%;冷态强度参数M40提高1.95%,M10下降了0.95%。 相似文献
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蒙古国煤储量丰富,价格低廉,黏结指数在50左右。为了合理使用蒙古国煤,降低配煤成本,利用40kg试验焦炉对其进行捣固炼焦试验研究。研究表明,蒙古国煤具有较高的反应活性,单独炼焦后焦炭反应性高,反应后强度低;在基础煤较好条件下,使用20%左右的蒙古国煤,可炼制M40≥80%、M10≤7%、CRI≤30%、CSR≥60%的焦炭。 相似文献
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煤焦油是一种制备高附加值碳材料的理想原料,然而其深加工利用受到内部高含量喹啉不溶物(QI)的影响。为此,本文介绍了煤焦油的组成和性质,简述了煤焦油中QI的组成、来源和其对煤焦油加工利用的危害,综合对比分析了煤焦油净化分离常用的几种方法。热过滤法分离效率虽然满足工业需求,但工业成本较高;重力沉降法操作简单,但分离效率低;离心分离法分离效率高,但处理量小,难以满足工业化应用;蒸馏处理法分离效率高,但原料利用率低;溶剂萃取法容易操作,但溶剂需求量大;改质法效果明显,但成本较高;静电分离法能量消耗低,但静电分离最佳条件变动性较大;联合处理法分离效率较高,应用前景广阔,可以作为一种净化分离的科学有效方法,并可以作为一种净化分离技术的发展趋势。 相似文献
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通过煤热解技术获取紧缺的油气资源是低阶煤清洁利用的有效途径之一。针对煤热解工艺存在焦油产率与品质难以控制以及焦油中粉尘含量高等关键技术问题,从煤的热解反应机理出发,详细探讨了热解挥发分二次反应的种类和发生条件以及影响热解过程的主要因素,结合煤热解技术应用,总结了逆向传热与传质所导致的挥发分气相二次反应是焦油产率下降的主要原因;同时,分析了热解过程中煤颗粒破碎机理以及煤热解过程中粉尘的主要来源。在前人研究结果的基础上,提出控制热解挥发分的流动方向从高温区向低温区流动、热解耦合气化以及耦合原位的焦油提质与除尘等方法可以调控煤热解过程,抑制重质焦油生成、提高焦油中轻质组分含量以及减少焦油中的含尘量,从而实现煤的定向热解。 相似文献
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We know that increasing the water content in coal tar above 4% and the ash content above 0.1% hinders its processing: soda
consumption is increased; greater heating is required in dehydration; and it is impossible to comply with standards regarding
the ash content in pitch coke and electrode pitch. Recently, the trend has been to introduce a centrifuge ahead of the final
tar store in systems for conditioning coal tar. 相似文献
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介绍了粉煤加氢快速热解技术的研发历程、技术概况、工艺原理、技术难点、工艺流程及特点。中试实验结果表明:热解焦油产率最高达23.1%,为原料煤格金焦油产率的187%;产品焦油的含尘率为0.08%,密度为1127kg/m^3;热解半焦的固定碳含量为81.3%,半焦比表面积为8.19m^2/g,平均孔径为4.95nm;合成气中H2和CO的体积分数分别为43.64%和31.99%,合成气热值达到12.16MJ/m^3以上。计算表明,该中试装置81h连续稳定运行期间的物料平衡偏差为1.79%,系统能效为94.6%。 相似文献
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The thermooxidation of moderate-temperature coal tar pitch with the return of pitch distillates is investigated, in conditions
such that high-temperature grade-C pitch is obtained. Gas-liquid chromatography shows that the content of polycyclic aromatic
hydrocarbons included in the list published by the United States Environmental Protection Agency (EPA) is not significantly
different in the pitch samples before and after oxidation. 相似文献
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The molecular weight distributions of coal tars and coal char extracts were examined in an effort to learn more about the process of mass transfer during coal pyrolysis. Evidence was obtained which suggests that the majority of the tar evolved during rapid pyrolysis of pulverized coal escapes by a process limited by gas film diffusion. However, there is also some evidence that the tar includes a small amount of heavy material which could have been ejected from the particle in a condensed phase. Data were also obtained which suggest that the tar precursors (within the parent coal) are formed over a wide range of temperature and do not seem to be present as such in the raw coal. The rather large effect of pressure on yields of tar from bituminous coal pyrolysis has previously been attributed to the effect of pressure on evaporation rates of tar precursors from the particle surface. This study shows that the molecular weight distributions of both the tar and extractable tar precursors within the particle are consistent with such a mechanism. 相似文献