Coal fractionation by density for coking purposes

Scarce coal with good coking properties may be obtained by separating less valuable coal into different density fractions. The use of valuable fractions released in enrichment ensures optimal coking-batch composition and yields metallurgical coke of the required quality.     

Improving the preparation of coal batch for coking

Various methods of preparing coal for coking are analyzed. Laboratory experiments are conducted with a view to obtaining higher-quality coke from batch with a high content of poorly clinkering coal.     

日本的煤炭需求与政策

日本未来能源需求中煤炭将增加,并将继续依赖进口,因此日本所采取的煤炭政策是进一步稳定国外煤炭供应,同时在国内发展洁净煤技术,提高煤炭的利用率。     

Influence of coal preparation and coking conditions on coke reactivity

The influence of various technological factors on the high-temperature properties of coke is investigated. It is found that factors facilitating an orderly organic structure of the coke (fine grinding and compaction of the batch, increased conditioning of the coke, dry slaking, the introduction of lubricant additives in the batch) reduce the reactivity of the coke; by contrast, introducing coke fines, intermediate product, and red mud in the batch increases the reactivity.     

Enhancing coke quality in dry slaking

Improvement in coke strength by methane treatment in dry quenching is considered. Kinetic and thermodynamic data for the thermal decomposition of methane indicate that its decomposition products may participate in a secondary reaction: the crosslinking of graphite planes in the coke structure, with consequent increase in strength. Laboratory tests confirm this conclusion. The proposed method may be used at coke plants to improve coke strength.     

日本室兰焦化厂的煤预热和煤调湿

概述了日本室兰焦化厂的煤预热及煤调湿(CMC)工艺过程,重点介绍了第三代流化床煤调湿技术、工艺流程及设备状况等。     

炼焦煤选煤厂的浮选药剂选择

五沟煤矿选煤厂通过选用不同药剂进行浮选试验,选择了新型捕收剂和高效改性起泡剂,同时采取有效措施,调整浮选工艺参数,提高了浮选效率,降低了药耗。     

我国捣固炼焦技术的进步与发展方向

介绍了捣固炼焦技术的特点,分析说明了我国捣固炼焦的发展历程和技术进步,指出了目前我国捣固炼焦存在的主要问题、改进措施和发展方向,分析预测到2025年前后我国焦炭产能将缩减到3．6亿t左右,届时捣固焦产能将占焦炭总产能的一半左右。     

中国焦化工业问题分析及对策研究

煤炭焦化工业在中国国民经济发展中占有不可或缺的重要地位,其生产发展和技术进步对中国经济建设意义重大.但是,近年来中国焦化工业出现多亏少赚的局面,其表面繁荣的背后却蕴含着复杂的矛盾.笔者综合大量调研信息,分析了中国焦化工业存在的问题,并提出了“更新理念、创新技术、加强化产、以化养焦”对策,供相关决策者参考.     

特大型炼焦煤选煤厂降低介耗的措施

从减少合格悬浮液中的煤泥量和控制磁选机入料浓度2个工艺理念出发,介绍临涣选煤厂东区介耗降到1．0kg／t以下国际先进水平的技术措施。     

大型、高效、简化重介质选煤技术

介绍了国华科技系列大型三产品重介质旋流器的工作特点及大型、高效、简化重介质选煤技术的开发、推广应用情况。     

焦化除尘粉制备活性炭的研究

研究了以焦化除尘粉为原料,采用水蒸气为活化剂制备活性炭的可行性.利用正交实验探讨了活化温度、活化时间、水蒸气流量等对活性炭吸附性能的影响.结果表明:影响除尘粉基活性炭制备的主次因素为活化温度、活化时间、水蒸气流量;制备除尘粉基活性炭的最佳条件为活化温度850.C,活化时间90 main,水蒸气流量10.73 mL/min,制备除尘粉基活性炭的碘吸附值为490.5215 mg/g,产率为35.16％.     

我国独立焦化厂的发展战略

介绍了我国焦化工业的现状和高炉大型化对焦炭质量的要求,分析了我国独立焦化厂发展面临的积极因素和不利因素,提出了独立焦化厂与上游煤矿联合,向下游钢铁企业延伸的发展战略。独立焦化厂应严格管理,降低成本,节能减排,对焦炉煤气进行综合利用,提高经济效益。     

Industrial experience with the thermal preparation of coal batch before coking

The basic industrial results obtained with thermal preparation of batch, followed by bed coking in horizontal furnaces, are briefly reviewed. Precarbon technology, which, in various forms, has been successfully used for many years, seems promising for the production of high-quality coke in a period of declining batch quality.     

Optimizing the preparation of coal batch for coking at ChAO Makeevkoks

The expediency of introducing up-to-date systems in the preparation of coal batch for coking at ChAO Makeevkoks is evident if the quality of the coal concentrates employed is assessed in terms of technical, plastometric, petrographic, and granulometric characteristics. Coking trials indicate that separating out the small coal classes prior to final crushing significantly improves the technological characteristics (M ₂₅, M ₁₀) and structural parameters (the Ginzburg abrasive hardness and Gryaznov structural strength) of the blastfurnace coke produced. Introducing hydrocarbon briquets in the coal batch permits the utilization of coking waste without impairing the coke strength.     

干选预排矸工艺在炼焦煤选煤厂的应用

针对临涣炼焦煤选煤厂入洗原料煤中矸石含量过高的问题,通过对青东矿煤质资料分析和重介质旋流器结构参数与处理量及分选效果之间的关系分析,确定采用干法分选机进行预排矸,同时对干法分选机的工艺效果进行了检查,通过数据计算出干选机分选可能偏差为0.068 g/cm~3;采用干法分选机预排矸每年可以节约电耗115.29万kW·h,具有较好的经济效益和社会效益。     

某炼焦煤选煤厂浮选尾煤再选的试验研究

结合某炼焦煤选煤厂生产实际,综合分析了浮选入料和浮选尾煤的性质,发现浮选入料中有部分大于0.5 mm粒级的低灰分颗粒混入,尾煤中含有较多低灰细粒煤可以回收;利用正交试验和响应面模拟的方法对浮选尾煤再选结果进行了研究模拟,得出在矿浆浓度为60 g/L,叶轮转速1 800 r/min,充气量为100 m~3/(m~2·min)时,尾煤再选可燃体回收率可达到79.93%;在影响可燃体回收率的因素中,矿浆浓度>叶轮转速>充气量。