Comparative filtration and dewatering behavior of vitrinite and inertinite of bituminous coal: Experiment and simulation study

The filtration and dewatering of fine clean coal not only ensure industrial water recycle in coal washing plant, but also reduce the moisture of coal product in order to meet the requirements of combustion or coking industry. Fine clean coal is mainly composed by organic matter, and the property difference of different organic matter determines the filtration and dewatering behavior. In this investigation, vitrinite and inertinite were separated from a clean bituminous coal, and the comparative filtration and dewatering behavior of vitrinite and inertinite were conducted. The results showed that inertinite has lower dewatering rate and higher filter cake moisture than vitrinite. The analysis of filter cake structure showed that inertinite particle is easier to be broken into small particles due to the difference of mechanical properties, thus forming more compact filter cake than vitrinite. The analysis of particle surface properties showed that vitrinite is more hydrophobic than inertinite, which makes water easier drained from filter cake. The simulation study showed that the structure of inertinite is more porous than that of vitrinite,and the interaction between inertinite and water is stronger than that between vitrinite and water. This study provides a theoretical basis for improving coal dewatering by selectively improving coal maceral hydrophobicity.     

Influences of different comminution methods on maceral segregations,ignition, and pyrolysis of superfine pulverized coal

The same bituminous coal is grinded by three representative grinding systems, respectively. Tendencies of maceral segregations in three systems are analyzed. The influences of maceral segregations on ignition temperatures and flash pyrolysis products are compared and discussed.     

Maceral and rank influences on the morphology of coal char

Concentrates of vitrinite and inertinite macerals have been pyrolysed in a flame under conditions representative of the initial stages of pulverized coal combustion. Char was distinguished from soot by size analysis and the char yield correlated with the proximate analysis. The char morphology was studied by optical microscopy and quantitative measurements of porosity and pore size were made using image analysis. Vitrinite and inertinite produce chars of characteristic morphology. The softening behaviour of inertinite varies with coal rank and can be related to the optical reflectance. The porosity of vitrinite chars approaches that of inertinite chars at high rank.     

毕节市王家坝井田C6-1、C7煤层煤质特征分析与评价

对勘探范围内毕节市王家坝井田的可采煤层地质储量进行了估算,并对C6-1和C7煤层进行了煤质特征分析与评价。研究表明,C6-1及C7煤层显微煤岩类型为微镜惰煤,显微矿化类型为微复矿质煤;C6-1煤层为中灰、中硫、高热值、特低挥发分、低磷、特低氯、一级砷高熔灰煤。C7煤层为低中灰、特低硫、特高热值、特低挥发分、特低磷、特低氯、一级砷高熔灰煤。煤类划分C6-1及C7煤层均属无烟煤三号,可广泛作为民用、化工、动力和火力发电用煤,其洗精煤可考虑供高炉喷吹用煤。     

新疆三塘湖盆地侏罗系烃源岩的显微组分组成及生烃组分剖析

运用有机岩石学全岩分析方法，对新疆三塘湖盆地中、下侏罗统煤系烃源岩进行了显微组分组成与生烃组分剖析。三塘湖盆地烃源岩显微组分中富含镜质组、贫腐泥组，明显具有高等植物陆源有机质占绝对优势的特点。显微组分含量与组成在各层段中呈现均不衡性，八道湾组为该区的主力烃源岩，孢子体和角质体是煤成油的最主要的生烃组分，渗出沥青体、微粒体的出现为该区烃类生成提供了证据。     

黔东南麻江—凯里地区烃源岩的有机岩石学特征

应用全岩有机岩石学分析方法,研究了黔东南麻江-凯里地区烃源岩的显微组分组成、生烃组分及有机质热演化.该区烃源岩主要有含沥青碳酸盐岩、泥岩和煤3类,其显微组分含量因样品不同而异,显示非均质性.含沥青碳酸盐岩样品的显微组分总含量(TMC)值为0.8%～13.6%,泥岩样的TMC值为1.4%～9.4%,煤样的TMC值超过70%.该区烃源岩的富氢显微组分主要由壳质组、沥青组、次生有机质和矿物沥青基质构成,其中孢子体、壳屑体、沥青及矿物沥青基质是其主要的生烃组分.该区烃源岩有机质热演化程度处于成熟-过成熟阶段,其等效镜质组反射率R_o为0.674%～2.659%.     

珠江口盆地烃源岩有机显微组分特征与生烃潜力分析

采用有机岩石学综合光学法研究了珠江口盆地古近系烃源岩的有机显微组分和亚显微组分特征,对典型烃源岩做了干酪根元素分析、岩石热解分析和高温高压泥岩热模拟实验,探讨了其生烃潜力和生烃属性。壳质组及富氢的壳镜组A含量较高,决定了中深湖相有机质的类型为Ⅰ—Ⅱ₁型,具倾油性;低含氢的壳镜组B和镜质组含量较高,决定了滨浅湖相和沼泽相有机质的类型主要为Ⅲ—Ⅱ₂型(Ⅱ₁型为辅),具倾凝析油、气性;腐泥组和惰质组含量低。2类烃源岩在不同演化阶段生烃属性均存在差异。这对进一步研究该盆地古近系不同凹(洼)陷有机相及勘探潜力和方向具有重要意义。     

下扬子地区中上二叠统页岩有机孔发育特征

下扬子地区中上二叠统发育一套海陆过渡相页岩,其显微组成与海相页岩存在明显的差异,为了研究该套页岩有机孔的发育特征及影响因素,开展了有机岩石学、扫描电镜、氩离子抛光扫描电镜、气测孔隙度和压汞等相关分析。研究表明,中上二叠统页岩中有机孔整体发育较好,但不同有机质组分中孔隙的发育存在明显的差别,具体表现为镜质体内孔隙发育差,固体沥青内发育少量孤立的孔隙,腐泥质内具有丰富的孔隙。黄铁矿或黏土矿物常与有机质形成有机/矿物复合体,复合体内有机孔普遍发育较好,可能与黄铁矿或黏土矿物促进有机质生烃和分解有关。中上二叠统页岩TOC含量与比表面积之间存在明显的线性正相关性,但与孔隙度之间具有复杂的关系,当w（TOC）<6.16%时,孔隙度随TOC含量的增加而增加,而当w（TOC）>6.16%时,孔隙度普遍较低且与TOC含量之间存在微弱的负相关性。孔径分布特征也揭示高TOC页岩的中—大孔体积明显低于低TOC页岩。页岩孔隙结构发育特征表明,TOC含量越高、固体沥青组分以及贫氢组分的含量越高,这些组分占据的矿物孔隙越多,降低了页岩总的孔隙空间,且TOC含量越高,页岩越易被压实,造成中大孔塌陷,进一步降低了页岩的孔隙度。     

贵州六盘水地区龙潭煤系煤岩富氢显微组分的生烃潜力与生烃贡献

从有机岩石学与有机地球化学角度研究烃源岩有机质成烃演化和生烃作用是油气资源评价的一个重要方面.本文探讨了贵州六盘水地区煤岩显微组分的生烃潜力和生烃贡献,并对富氢显微组分的组成与氢指数作了相关性研究,提出了计算显微单组分生烃贡献的一种方法.结果表明:研究区的基质镜质体早于树皮体产生液态烃类,富氢显微组分的含量与氢指数表现出很好的相关性;基质镜质体是煤生烃作用的最大贡献者.这一结论对研究区油气资源潜力评价有着重要的参考价值.笔者认为,烃源岩有机质的生烃潜力是针对其生烃性能而言的,是生烃作用的“质”的衡量标准;生烃贡献则是针对其在生烃过程中的生烃配分而言的,是生烃作用的“量化”标准,提出将生烃贡献指标作为烃源岩有机质生烃评价的判别指标的可行性和必要性.     

Macerals in bituminous coals and the coking process: Part 1: Effect of basic coal properties on the process of thermal degradation

Bituminous coals produced in the Ostrava—Karviná coal basin show considerable variation in their maceral composition and rank. In order to explain the significance of the petrographic composition, structure and chemical parameters in coal degradation processes, a large number of coal samples was investigated. From the relationships obtained, the behaviour of macerals during these processes is discussed. It is found that isometamorphic vitrinites are characterized by a distinctive behaviour affected to a first approximation by the atomic ratios C/H and C/O. Inertinite, despite its occasional significantly higher volatile matter, does not yield an appreciable amount of fused material.