Metamorphism and mineral composition of coal

The influence of ash content on the chemical composition of the ash is considered, along with the dependence of the Fe₂O₃, CaO, MgO, and SiO₂ content in the ash of Kuznetsk and Donetsk coal on the yield of volatiles V ^daf , which characterizes the degree of metamorphism. Correlation analysis shows that this dependence is described by second-order polynomial equations within the ranges considered. Within the interval V ^daf = 20–28% (from the overall range 8 ≤ V ^daf ≤ 45% considered), the content of most oxides in the ash passes through an extremum. The idea that high contents of ore components (Fe₂O₃, CaO, and MgO) in the ash are useful should be revised, since they impair the CSR and CRI values of the coke.     

炼焦煤中灰分对焦炭热性能的影响

研究了炼焦煤的灰分和催化指数,通过小焦炉实验进行了焦炭的反应性和反应后强度的测定。结果表明,灰分催化指数对焦炭的反应性和反应后强度的影响显著。焦炭的反应性与灰分碱性催化指数呈正线性相关,焦炭的反应后强度与灰分碱性催化指数呈负线性相关。     

Change of pore properties during carbonization of coking coal

Porosimetry, sorption and density measurements are reported on two caking bituminous coals, West Virginia Jewel No. 2 medium volatile and a Pennsylvania Pittsburgh seam high volatile C, for final carbonization temperatures between 400 and 1000°C. Samples were not confined and heating rates of 3 and 8.2°/min were employed. The medium volatile samples exhibit pronounced maxima in pore volume, pore surface area and porosity between 600 and 800°C. These temperatures are considerably greater than the characteristic temperature and the temperature at which maximum dilation occurs. The high volatile C coal does not exhibit well defined maxima. Results are interpreted in terms of pore development mechanisms. A mathematical model for pore development is proposed and shown to correlate satisfactorily, the pore volume and surface area measurements.     

炼焦煤焦化特性评价指标探讨

介绍了奥亚膨胀度、基氏流动度、罗加指数、胶质层指数、黏结指数和镜质组平均最大反射率等冶金煤焦化特性评价指标的建立和测试方法,以及各评价指标在我国的应用情况。同时讨论了各个指标对胶质体的原生黏结性、膨胀程度引起的黏着性和焦炭残留物强度这3个焦化特性的表征。     

次烟煤与高硫焦煤共热解相互影响及动力学研究

为了研究次烟煤与高硫焦煤共热解过程中的相互作用,选取资源相对丰富的水峪高硫焦煤(SC)作为主炼焦煤样,伊宁次烟煤(YC)为配入煤样,通过热重分析技术对2种煤样及其不同配比混煤的热解行为进行了研究,并通过计算动力学参数分析热解过程的动力学特性。结果表明,由于变质程度的不同,煤样SC和YC单独热解的行为差异明显;混煤共热解的失重率随着YC掺入比例的增加而增大,但共热解行为并非SC和YC热解特性的简单加和。动力学分析表明,2种煤及其混煤在不同热解反应阶段的动力学参数不同,各热解阶段的活化能和指前因子数值的大小顺序均随YC掺入比例的增加呈规律性变化,但并非单种煤热解活化能和指前因子数值的简单加权平均,混煤的热解行为是2种原煤相互作用的结果。     

高硫焦煤在配煤中的应用

通过研究高硫焦煤的理化性质,在配合煤中配入一定比例的廉价高硫焦煤,焦炭质量得到改善,主焦煤的使用比例减少,入炉煤成本大幅降低.     

Modified coal batch in coking

The influence of volatile products from low-metamorphic poorly clinkering G coal on plasticmass formation in rammed batch during coking is considered. An experimental batch of modified coke has been produced at PAO Alchevskkoks.     

Agglomeration kinetics of coking coal particles during the softening phase

Agglomeration kinetics under thermal conditions describe the structure and formation of larger bodies, termed agglomerates from coal particles, as a preliminary phase of semi-coke formation. Knowledge on particle adhesion characteristics are of particular importance for determining the strength as well as the structure of the agglomerates. Several adhesive forces acting during the adhesion mechanism may be roughly subdivided into bonding with and bonding without material bridges. The purpose of the present work was to investigate the adhesion mechanism; the formation and growth in time of the bonding neck between two particles, as well as the change of functional correlation with other parameters, i.e. temperature and coal quality. Experimental investigation of the kinetics of agglomeration was carried out using apparatus in which a coal layer was heated by radiation in an atmosphere of flowing nitrogen. Camera recordings allowed quantitative assessment of the growth of the bonding neck with time, and additionally the dependence of the parameters on temperature and coal quality could be determined. The evaluation of the tests yielded clear indications supporting the assumption that increased adhesion of two viscous spheres under the effect of surface tension can be used as a physico-chemical model for the agglomeration of two coal particles under thermal conditions.     

Clinkering properties of rammed coking coal and coal batches

The clinkering properties of rammed coking coal and coal batches are investigated. There is a close relation between the clinkering properties and coke quality.     

Russian coking coal in 2008 and 2009

The distribution and quality of Russian coal and coke resources are compared for periods before (the first nine months of 2008) and during (from the fourth quarter of 2008 to the second quarter of 2009) the economic crisis. Attention then turns to the definition and determination of the technological value of coal. Analysis of coke strength suggests that, in current conditions (with no crisis), the production of high-quality (high-strength) coke is not economically justified     

Russian coking coal in 2008 and 2009

Coal resources and coke production in the second half of 2009 and the first quarter of 2010 are considered. The unsuitability of the available coal for the production of high-strength coke is analyzed.     

Quality fluctuations of coking coal

The quality fluctuations of coal from different sources is assessed, in terms of technical analysis, petrographic analysis, and plastometric data. Considerable fluctuations are seen in the moisture, ash, and sulfur content, the thickness of the plastic layer, the vitrinite content, and the sum of lean components. To obtain stable coal quality, more consistent properties of individual coal ranks are required, as well as more effective blending.     

Properties of Taiwan coking coal

Three Taiwan coking coals, Shuangchi HV, Fusin MV and Nanchuang MV, were investigated. Chemical, physical and petrographic analyses, carbonization tests and coke quality determinations were conducted for these coals. The results showed that these are good quality coking coals and have several properties in common as follows: very high calorific values (> 8000 kcal/kg, d.b.), coking power, vitrinite content (> 94%), Hardgrove grindability index, and coke porosity. They are suitable for coal blending. The coal seams are very thin (≈30–50 cm) and they occur in very young coal-bearing strata (Miocene).     

Industrial coking of coal batch without bituminous coal

For many years, Kuznetsk-coal batch has always included bituminous coal. Depending on the content of such coal, the batch may be characterized as lean, moderately clinkering, or bituminous. This classification was adopted by specialists of the Eastern Coal-Chemistry Institute (ECCI) in experimental coking at Magnitogorsk Metallurgical Works in 1945 [1]. Lean batch contained 10% Osinovsk bituminous coal (plastic-layer thickness y = 13 mm); moderately coking coal contained 25% bituminous coal (y = 16 mm); and bituminous batch contained 40% of such coal (y = 20 mm).     

红外光谱分析淮南煤灰中矿物组成

选取淮南矿区HN115与HN119两种煤样,在氧化性气氛下,制成815℃煤灰。利用红外光谱研究了其矿物质组成以及煤中添加不同比例助熔剂CA后矿物组成的变化。结果表明:淮南煤灰中,矿物质组成为石英、硬石膏、方解石、高岭土和赤铁矿,其中硬石膏和方解石含量较低。煤中添加助熔剂CA后,煤灰中硬石膏含量增加,并且随着助熔剂CA量的不断增加,方解石含量在不断减少,硬石膏含量在不断增加。     

改善炼焦工艺管理,扩大炼焦用煤范围

对扩大炼焦用煤煤源的理论基础及可实践应用的新型技术进行了分析和总结,认为从应用新技术和改善炼焦工艺控制入手,可以扩大炼焦用煤煤源。     

煤岩学方法在分析炼焦煤质量中的应用

对炼焦煤进行工业分析,对其黏结指数、胶质层指数、煤岩指标及焦炭的光学组织和热性能进行研究,并与同类型煤质进行比较,利用煤岩学指标,判断煤的变质程度及混煤情况,可更好地鉴别炼焦煤质量.     

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%。     

Differences in the coking pressure of coal

A method is developed for formulating a rheological model that describes the plastic mass of coal; the parameters of the plastic mass in the state of maximum deformability are considered. This method is used in investigating coal from the Pechorsk, Donetsk, and Karagandinsk basins.