期刊文献+
共找到115,024篇文章
< 1 2 250 >
每页显示 20 50 100
文章速递Research progress and prospects of coal petrology and coal quality in China 认领
1
作者 Yuegang Tang Ruiqing Li Shaoqing Wang 《国际煤炭科学技术学报:英文版》 EI 2020年第2期273-287,共15页
Clean utilization of coal depends on the quality of raw coal,which depends on the coal-forming parent materials(petrology and chemical composition of coal),the multiple media of the coal-forming environment,and some e... Clean utilization of coal depends on the quality of raw coal,which depends on the coal-forming parent materials(petrology and chemical composition of coal),the multiple media of the coal-forming environment,and some epigenetic conditions,such as thermal evolution(coalification),magmatic hydrothermal fluid,groundwater.Based on the research results of predecessors and prediction studies of coal resources since the founding of China,the present status of research on coal petrology,coal quality,coal metamorphism,and coal geochemistry in China is discussed in detail,with emphasis on research progress and the general situation of highly efficient and clean utilization of coal in the technical fields of coking,pyrolysis,combustion,gasification,and liquefaction,and the development prospects of coal petrology and coal quality in China are prospected. 展开更多
关键词 Coal petrology Coal quality Coal metamorphism Coal geochemistry Research status Prospect
在线阅读 下载PDF
煤灰成分对其熔融性影响探究 认领
2
作者 宋宝瑞 《煤炭与化工》 CAS 2020年第4期133-135,共3页
煤灰组成与煤灰熔融性之间有十分密切关系,煤灰熔融温度高低取决于煤灰组成成分的不同。通过实验,探讨了煤灰成分的组分SiO2、Al2O3、TiO2、Fe203、CaO等对煤灰熔融温度影响,分析了煤灰组分对灰熔融温度影响大小,提出探讨煤灰成分与煤... 煤灰组成与煤灰熔融性之间有十分密切关系,煤灰熔融温度高低取决于煤灰组成成分的不同。通过实验,探讨了煤灰成分的组分SiO2、Al2O3、TiO2、Fe203、CaO等对煤灰熔融温度影响,分析了煤灰组分对灰熔融温度影响大小,提出探讨煤灰成分与煤灰熔融性关系,对煤灰成分、煤灰熔融性结果审核及评价动力用煤气化用煤具有实际意义。 展开更多
关键词 煤炭 煤灰成分 煤灰熔融性
在线阅读 下载PDF
Decomposition of carbon dioxide hydrate in the samples of natural coal with different degrees of metamorphism 认领
3
作者 Vyacheslav G. Smirnov Valeriy V. Dyrdin +1 位作者 Andrey Yu. Manakov Zinfer R. Ismagilov 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2020年第2期492-501,共10页
Methane and carbon dioxide hydrates are one of the possible forms in which these gases exist in natural coal(for more detailed discussion see Refs [1,2]). In this work, the decomposition of carbon dioxide hydrate in f... Methane and carbon dioxide hydrates are one of the possible forms in which these gases exist in natural coal(for more detailed discussion see Refs [1,2]). In this work, the decomposition of carbon dioxide hydrate in five samples of natural coal differing from each other in metamorphism degree was investigated experimentally. Carbon dioxide hydrate dispersed in coals was synthesized from water adsorbed in these coals. During a linear temperature rise in an autoclave with the coal + hydrate sample the hydrate decomposition manifests itself as a step of increase in gas pressure, accompanied by a decrease/stabilization of the temperature of coal sample. The dependencies of the amount of hydrate formed on initial coal humidity and on gas pressure during hydrate formation were studied. It was demonstrated that each coal sample is characterized by its own humidity threshold below which hydrate formation in natural coal is impossible. With an increase in gas pressure, the amount of water transformed into hydrate increases. For the studied coal samples, the decomposition of carbon dioxide hydrates proceeds within a definite temperature and pressure range, and this range is close to the curve of phase equilibrium for bulk hydrate. 展开更多
关键词 GAS HYDRATE Carbon dioxide COAL COAL RANK Phase transformation COAL bed GAS
在线阅读 下载PDF
Radiological Impact Assessment of Mining on Soil, Water and Plant Samples from Okobo Coal Field, Nigeria 认领
4
作者 A. U. Itodo P. O. Edimeh +1 位作者 I. S. Eneji R. A. Wuana 《地球科学和环境保护期刊(英文)》 2020年第5期65-81,共17页
Anthropogenic, including mining activities leaves the environment contaminated with potentially toxic substances and remote hazards if not properly checked. The quest in this study is the levels of naturally occurring... Anthropogenic, including mining activities leaves the environment contaminated with potentially toxic substances and remote hazards if not properly checked. The quest in this study is the levels of naturally occurring radionuclides in Okobo coal, Nigeria and their possible distribution in coal mine vicinity soils, water and plants (cassava). Samples were characterized for levels of radionuclides and radiological detriments using high resolution gamma spectrometer, Gamma ray liquid scintillation and applicable radiological hazard indices. The range of mean activity concentrations (Bq·kg-1) for the environmental samples are as follows: 226Ra (8.39 ± 1.0 to 77.6 ± 4.0), 232Th (0.470 ± 0.4 and 77.8 ± 2), and 40K (29.1 ± 0.4 and 289 ± 6), with their respective mean values of 32.7 ± 2.1, 54.0 ± 1.5 and 158.8 ± 3.1 (Bq·kg-1). Radiological detriments including radium equivalent activity (Raeq), external hazard index (Hex), internal hazard index (Hin), radioactivity level index or gamma index (Iγ) and the ELCR for coal sample is 96.94 Bq·kg-1, 0.26, 0.30, 0.69, and 1.56 respectively. Reported values were below the safety limits stipulated by UNSCEAR and implied that the environment is relatively safe with low levels of natural radioactivity. Overall, this background study has demonstrated that Okobo coal mine is a less radio-hazard contributor to environmental samples. Exceptions to this generalization are representative gamma index (Iγr) and annual effective dose equivalent values for some cassava and soil samples, which may call for future impact monitoring. 展开更多
关键词 Coal RADIOLOGICAL Detriments HAZARD Okobo Activity CONCENTRATIONS GAMMA-RAY SPECTROMETRY
在线阅读 免费下载
我国洁净煤技术2035发展趋势与战略对策研究 认领
5
作者 孙旭东 张博 彭苏萍 《中国工程科学》 CSCD 北大核心 2020年第3期132-140,共9页
煤炭在我国能源结构中长期保持基础性地位。实现煤炭资源的清洁高效利用,亟待大力发展洁净煤技术。本文在界定洁净煤技术概念的基础上,辨识了洁净煤技术的先进性特征,预判了面向2035的关键前沿技术,结合国内外主要前沿技术的发展现状,... 煤炭在我国能源结构中长期保持基础性地位。实现煤炭资源的清洁高效利用,亟待大力发展洁净煤技术。本文在界定洁净煤技术概念的基础上,辨识了洁净煤技术的先进性特征,预判了面向2035的关键前沿技术,结合国内外主要前沿技术的发展现状,明确了我国洁净煤技术发展战略目标与路径,据此提出了相应的政策建议。研究发现,我国在700℃超超临界、整体煤气化联合循环/整体煤气化燃料电池联合循环(IGCC/IGFC)等先进发电技术及煤炭深加工产业的技术研发、装备制造和工程示范等方面具有一定的国际竞争力,但在自主创新能力、体制机制、区域或企业间平衡发展等方面仍存在诸多问题,应当着眼于煤炭能源长远发展,前瞻规划面向2035的洁净煤技术与产业发展方向,积极部署先进技术研发与工程示范,全面提升我国洁净煤技术发展水平,有效改善煤炭清洁高效利用的产业发展环境。 展开更多
关键词 煤炭 洁净煤技术 能源战略 2035
在线阅读 免费下载
A review on co-pyrolysis of coal and oil shale to produce coke 认领
6
作者 Xiangchun Liu Ping Cui +2 位作者 Qiang Ling Zhigang Zhao Ruilun Xie 《化学科学与工程前沿:英文版》 SCIE EI CAS CSCD 2020年第4期504-512,共9页
It has become the top priority for coking industry to rationally use and enlarge coking coal resources because of the shortage of the resources.This review focuses on the potential utilization of oil shale(OS)as a fee... It has become the top priority for coking industry to rationally use and enlarge coking coal resources because of the shortage of the resources.This review focuses on the potential utilization of oil shale(OS)as a feedstock for coal-blending coking,in which the initial and basic step is pyrolysis.However,OS has a high ash content.If such OS is directly used for coal-blending coking,the coke product will not meet market demand.Therefore,this review firstly summarizes separation and beneficiation techniques for organic matter in OS,and provides an overview on coal and OS pyrolysis through several viewpoints(e.g.,pyrolysis process,phenomena,and products).Then the exploratory studies on co-pyrolysis of coal with OS,including co-pyrolysis phenom-ena and process mechanism,are discussed.Finally,co-pyrolysis of different ranks of coals with OS in terms of coal-blending coking,where further research deserves to be performed,is suggested. 展开更多
关键词 COAL oil shale CO-PYROLYSIS coal blending coking COKE
基于水力割缝的高瓦斯煤层掘进工作面强化增渗技术与实践 认领
7
作者 程波 樊正兴 何显能 《中国矿业》 北大核心 2020年第6期121-126,共6页
以山西省潞安一缘煤业150112试验工作面运输巷的掘进为工程背景,基于GF-100型超高压水力割缝设备,分析了煤巷掘进工作面高压水力割缝强化瓦斯抽采的技术原理。将高压水力割缝工艺与高瓦斯矿井煤巷的安全、快速掘进有机结合,提高了掘进... 以山西省潞安一缘煤业150112试验工作面运输巷的掘进为工程背景,基于GF-100型超高压水力割缝设备,分析了煤巷掘进工作面高压水力割缝强化瓦斯抽采的技术原理。将高压水力割缝工艺与高瓦斯矿井煤巷的安全、快速掘进有机结合,提高了掘进工作面煤体的渗透特性,增强了瓦斯抽采效果,形成了基于水力割缝的高瓦斯煤层掘进工作面强化增渗技术工艺体系,并在试验工作面煤巷掘进中进行了应用。结果表明:①将高压水力割缝工艺应用于高瓦斯矿井煤巷的掘进作业,解决了使用常规方法施工措施钻孔工程量大、抽采周期长的问题;②在采用水力割缝作业期间,瓦斯抽采量提高了2.36~2.4倍,平均日进尺提升了近2.5倍。 展开更多
关键词 瓦斯 水力割缝 煤巷掘进
在线阅读 下载PDF
煤中伴生稀有元素及其分布、迁移的几个规律 认领
8
作者 杨建业 张卫国 邹建华 《稀有金属》 EI CAS CSCD 北大核心 2020年第4期440-448,共9页
本文研究了煤中元素,特别是微量稀有元素,在不同的化学分异和机械分异过程中,遵循着一些基本的迁移分配规律。得到,即便是人工作用,任何可量化的地球化学过程或者是其他化学过程,均符合元素周期性变化规律,并在本文中首次实现了定量化... 本文研究了煤中元素,特别是微量稀有元素,在不同的化学分异和机械分异过程中,遵循着一些基本的迁移分配规律。得到,即便是人工作用,任何可量化的地球化学过程或者是其他化学过程,均符合元素周期性变化规律,并在本文中首次实现了定量化描述。而人工的机械分异过程,元素在不同粒级的飞灰颗粒之间,其分配规律除了可用元素周期性变化规律描述外,还可用自回归函数得到的经验公式进行定量描述。但在实验空间密闭的条件下,元素到煤灰中浓集作用,则不符合元素周期性变化规律,呈现出所有元素均以同比例同倍数的迁移方式,富集到高温灰化后的煤灰中。从而得出了煤在不同利用过程中,煤及其燃烧的副产物中稀有金属元素和其他微量元素的几种常见的分布规律。 展开更多
关键词 元素的地球化学行为 元素周期律 自回归函数 煤灰
Organic Geochemical and Petrographic Characteristics of the Coal Measure Source Rocks of Pinghu Formation in the Xihu Sag of the East China Sea Shelf Basin: Implications for Coal Measure Gas Potential 认领
9
作者 WANG Yang QIN Yong +3 位作者 YANG Liu LIU Shimin Derek ELSWORTH ZHANG Rui 《地质学报:英文版》 SCIE CAS CSCD 2020年第2期364-375,共12页
Coal measure source rocks, located in the Xihu Sag of the East China Sea Shelf Basin, were analyzed to define the hydrocarbon generation potential, organic geochemistry/petrology characteristics, and coal preservation... Coal measure source rocks, located in the Xihu Sag of the East China Sea Shelf Basin, were analyzed to define the hydrocarbon generation potential, organic geochemistry/petrology characteristics, and coal preservation conditions. The Pinghu source rocks in the Xihu Sag are mainly gas-prone accompany with condensate oil generation. The coals and shales of the Pinghu Formation are classified from "fair" to "excellent" source rocks with total organic carbon(TOC) contents ranging from 25.2% to 77.2% and 1.29% to 20.9%, respectively. The coals are richer in TOC and S1+S2 than the shales, indicating that the coals have more generation potential per unit mass. Moreover, the kerogen type of the organic matter consists of types Ⅱ-Ⅲ and Ⅲ, which the maturity Ro ranges from 0.59% to 0.83%. Petrographically, the coals and shales are dominated by vitrinite macerals(69.1%–96.8%) with minor proportions of liptinite(2.5%–17.55%) and inertinite(0.2%–6.2%). The correlation between maceral composition and S1+S2 indicates that the main contributor to the generation potential is vitrinite. Therefore, the coals and shales of the Pinghu Formation has good hydrocarbon generation potential, which provided a good foundation for coal measure gas accumulation. Furthermore, coal facies models indicates that the Pinghu coal was deposited in limno-telmatic environment under high water levels, with low tree density(mainly herbaceous) and with low-moderate nutrient supply. Fluctuating water levels and intermittent flooding during the deposition of peat resulted in the inter-layering of coal, shale and sandstone, which potentially providing favorable preservation conditions for coal measure gas. 展开更多
关键词 hydrocarbon generation POTENTIAL COAL facies COAL MEASURE GAS Pinghu Formation Xihu SAG
在线阅读 下载PDF
煤吸附常数的影响因素分析 认领
10
作者 赵立鹏 高为 周培明 《四川化工》 CAS 2020年第2期42-45,共4页
通过对烟煤和无烟煤各煤级173个煤样的平衡水分、灰分、挥发分产率、显微组分、镜质体反射率和吸附常数的综合研究,探讨了煤吸附常数的影响因素,揭示了不同影响因素条件下等温吸附常数的变化规律。结果显示:煤变质程度相近时,平衡水分... 通过对烟煤和无烟煤各煤级173个煤样的平衡水分、灰分、挥发分产率、显微组分、镜质体反射率和吸附常数的综合研究,探讨了煤吸附常数的影响因素,揭示了不同影响因素条件下等温吸附常数的变化规律。结果显示:煤变质程度相近时,平衡水分含量增加,灰分(干基)含量增加,温度升高,吸附常数a有线性下降的趋势。a值与烟煤和无烟煤的镜质组含量及镜质组反射率呈一定的正相关趋势,与挥发分产率呈一定的负相关趋势。b值与烟煤和无烟煤的镜质组反射率呈一定的负相关趋势。各煤级吸附常数a平均值呈较好一次正相关线性关系,吸附常数b平均值呈较好的二次负相关线性关系。 展开更多
关键词 等温吸附 煤级 镜质体反射率
在线阅读 下载PDF
提升气化炉原料煤灰熔点的研究 认领 被引量:1
11
作者 景登才 《化工管理》 2020年第4期132-133,159共3页
针对气化煤灰熔点较低煤活性差,炉体内壁挂渣效果较差,煤炭燃烧不充分,渣含碳量较高等问题,文章对气化用煤煤质进行了分析,并决定选用酸性氧化物SiO2和Al2O3含量较高、灰熔点均较高(FT>1500℃)的三矿和五矿煤矸石作为阻熔剂,按照一... 针对气化煤灰熔点较低煤活性差,炉体内壁挂渣效果较差,煤炭燃烧不充分,渣含碳量较高等问题,文章对气化用煤煤质进行了分析,并决定选用酸性氧化物SiO2和Al2O3含量较高、灰熔点均较高(FT>1500℃)的三矿和五矿煤矸石作为阻熔剂,按照一定比例与气化用煤混合,提高进气化炉煤粉的灰熔点。在反复试验过程中,采取95:5的配比方案后得到上述试验结果,可将巴彦高勒末原煤的灰熔点由1180℃提高至1270℃,增幅为90℃,满足了世林化工航天煤粉加压气化炉的运行需要。 展开更多
关键词 灰熔点 煤炭 煤质分析 提升
在线阅读 下载PDF
煤炭生态地质勘查基本构架与科学问题 认领 被引量:7
12
作者 王佟 孙杰 +4 位作者 江涛 林中月 张博 赵欣 谢志清 《煤炭学报》 EI CAS CSCD 北大核心 2020年第1期276-284,共9页
基于煤盆地矿产资源与生态环境地质特征,以实现煤盆地多资源协同勘查开发与资源开发中生态环境和谐为目标,提出了煤炭生态地质勘查的理念与基本构架。煤炭生态地质勘查是指以煤炭地质基础理论和生态学理论为指导,针对煤盆地呈固、液、... 基于煤盆地矿产资源与生态环境地质特征,以实现煤盆地多资源协同勘查开发与资源开发中生态环境和谐为目标,提出了煤炭生态地质勘查的理念与基本构架。煤炭生态地质勘查是指以煤炭地质基础理论和生态学理论为指导,针对煤盆地呈固、液、气、元素“四态”赋存的矿产资源、地表及地下空间关键层位、生态环境与其他自然资源,采用空、天、地一体化的多种勘查技术,涵盖资源勘查、开发地质保障、资源开发与环境保护、资源综合利用、生态修复与生态系统重构并贯穿于煤炭资源勘查开发到矿山闭坑全过程的相关地质与生态勘查工作。煤炭生态地质勘查是今后煤炭地质勘查工作的重要发展方向,核心理念是生态保护优先。基于煤炭生态地质勘查理念,以煤系矿产资源和水资源、地质关键层以及生态环境保护、监测、修复相关的主要地理要素、地质信息为对象,建立了煤炭生态地质勘查基本架构,分析了煤炭地质勘查工作向资源保障和环境保护与生态建设相结合的生态地质勘查方向转变的紧迫性。研究认为:煤炭生态地质勘查要统筹好资源保障与生态环境的关系,超前规划布局,优选遥感、快速精准钻探、高精度地球物理勘探等绿色勘查技术“空天地一体化”协同应用。根据煤盆地资源赋存特征选用煤与多种矿产资源的双目标、三目标、四目标、多目标协同勘查模式,同时在资源勘查、资源开采、采后修复全过程中注重地质关键层和生态环境信息的变化,实施环境保护与生态修复措施,并通过地质大数据分析技术,集成多维数据展示勘查成果,实现对煤系多种矿产资源、生态环境地质信息、开发地质条件的透明化、数字化。 展开更多
关键词 煤炭 煤系矿产 生态地质勘查 基本架构 勘查技术
在线阅读 下载PDF
Geological characteristics and co-exploration and co-production methods of Upper Permian Longtan coal measure gas in Yangmeishu Syncline, Western Guizhou Province, China 认领
13
作者 Cai-qin Bi Jia-qiang Zhang +6 位作者 Yan-sheng Shan Zhi-fang Hu Fu-guo Wang Huan-peng Chi Yue Tang Yuan Yuan Ya-ran Liu 《中国地质(英文)》 2020年第1期38-51,共14页
Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methan... Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methane,coal shale gas and coal measure tight sandstone gas)from single coalbed methane has greatly expanded the field and space of resource evaluation,which is of positive significance for realizing the comprehensive utilization of coal resources,maximizing the benefits and promoting the innovation of oil and gas geological theory and technological advances in exploration and development.For the first time,in Yangmeishu Syncline of Western Guizhou Province,the public welfare coalbed methane geological survey project of China Geological Survey has been carried out a systematic geological survey of coal measure gas for the Upper Permian Longtan Formation,identified the geological conditions of coal measure gas and found high quality resources.The total geological resource quantity of coalbed methane and coal shale gas is 51.423×109 m3 and the geological resource abundance is up to 566×106 m3/km2.In this area,the coal measures are characterized by many layers of minable coal seams,large total thickness,thin to the medium thickness of the single layer,good gas-bearing property of coal seams and coal measure mudstone and sandstone,good reservoir physical property and high-pressure coefficient.According to the principle of combination of high quality and similarity of key parameters of the coal reservoir,the most favorable intervals are No.5-2,No.7 and No.13-2 coal seam in Well YMC1.And the pilot tests are carried out on coal seams and roof silty mudstone,such as staged perforation,increasing hydraulic fracturing scale and"three gas"production.The high and stable industrial gas flow with a daily gas output of more than 4000 m3 has been obtained,which has realized the breakthrough in the geological survey of coal measure gas in Southwest China.Based on the above investigation results,the geological characteris 展开更多
关键词 Coal measure gas Reservoir characteristics Favorable interval optimization Reservoir fracturing reconstruction Coal measures"three gas"drainage Oil and gas exploration enginerreing Upper Permian Longtan Formation Yangmeishu Syncline Western Guizhou Prov
在线阅读 免费下载
煤的岩相分析在配煤炼焦中的实践应用 认领
14
作者 乔彦星 《山西化工》 2020年第1期136-138,共3页
随着社会经济发展水平的日益提升,我国钢铁产量也在不断增多,这使得钢铁业对焦炭的质量也提出了更高的要求.但是目前在配煤炼焦过程中还存在一些问题,如煤种复杂、矿点较多、煤质波动幅度较大等.这些问题不仅会在大程度上降低炼焦效率... 随着社会经济发展水平的日益提升,我国钢铁产量也在不断增多,这使得钢铁业对焦炭的质量也提出了更高的要求.但是目前在配煤炼焦过程中还存在一些问题,如煤种复杂、矿点较多、煤质波动幅度较大等.这些问题不仅会在大程度上降低炼焦效率和质量,还会增加资金投入成本,加大环境污染.所以需要焦化企业相关人员能够积极分析存在的问题,在配煤炼焦中合理引入煤的岩相分析,为提高配煤炼焦的质量提供有力条件.就煤的岩相分析在配煤炼焦中的实践应用作出分析,提出几点建议,以供参考. 展开更多
关键词 岩相分析 配煤炼焦 实践应用
在线阅读 下载PDF
Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe 认领
15
作者 Bo Tan Huilin Liu +1 位作者 Bin Xu Tian Wang 《国际煤炭科学技术学报:英文版》 EI 2020年第1期68-78,共11页
Coal dust explosion accidents often cause substantial property damage and casualties and frequently involve nano-sized coal dust.In order to study the impact of nano-sized coal on coal dust and methane–coal dust expl... Coal dust explosion accidents often cause substantial property damage and casualties and frequently involve nano-sized coal dust.In order to study the impact of nano-sized coal on coal dust and methane–coal dust explosions,a pipe test apparatus was used to analyze the explosion pressure characteristics of five types of micro-nano particle dusts(800 nm,1200 nm,45μm,60μm,and 75μm)at five concentrations(100 g/m3,250 g/m3,500 g/m3,750 g/m3,and 1000 g/m3).The explosion pressure characteristics were closely related to the coal dust particle size and concentration.The maximum explosion pressure,maximum rate of pressure rise,and deflagration index for nano-sized coal dust were larger than for its micro-sized counterpart,indicating that a nano-sized coal dust explosion is more dangerous.The highest deflagration index Kst for coal dust was 13.97 MPa/(m·s),indicating weak explosibility.When 7%methane was added to the air,the maximum deflagration index Kst for methane–coal dust was 42.62 MPa/(m·s),indicating very strong explosibility.This indicates that adding methane to the coal dust mixture substantially increased the hazard grade. 展开更多
关键词 A pipe test apparatus NANO-SIZED Coal dust explosion Methane/coal dust explosion Pressure characteristics
在线阅读 下载PDF
Prediction of geotemperatures in coal-bearing strata and implications for coal bed methane accumulation in the Bide-Santang basin,western Guizhou,China 认领
16
作者 Chen Guo Yong Qin +2 位作者 Dongmin Ma Zhaobiao Yang Lingling Lu 《矿业科学技术学报:英文版》 SCIE EI CSCD 2020年第2期235-242,共8页
The geothermal fields of coal-bearing strata have become a key topic in geological research into coal and coal bed methane(CBM).Based on temperature data from 135 boreholes that penetrate the Upper Permian coal-bearin... The geothermal fields of coal-bearing strata have become a key topic in geological research into coal and coal bed methane(CBM).Based on temperature data from 135 boreholes that penetrate the Upper Permian coal-bearing strata in the Bide-Santang basin,western Guizhou,the precisions of geothermal predictions made using a geothermal gradient model and a gray sequence GM(1,1)model are analyzed and compared.The results indicate that the gray sequence GM(1,1)model is more appropriate for the prediction of geothermal fields.The GM(1,1)model is used to predict the geothermal field at three levels with depths of 500,1000,and 1500 m,as well as within the No.6,No.16,and No.27 coal seams.The results indicate that the geotemperatures of the 500 m depth level are between 21.0 and 30.0°C,indicating no heat damage;the geotemperatures of the 1000 m depth level are between 29.4 and 44.7°C,indicating the first level of heat damage;and the geotemperatures of the 1500 m depth level are between35.6 and 63.4°C,indicating the second level of heat damage.The CBM contents are positively correlated with the geotemperatures of the coal seams.The target area for CBM development is identified. 展开更多
关键词 Geotemperature GRAY sequence GEOTHERMAL gradient Heat damage COAL COAL BED METHANE
在线阅读 下载PDF
煤气脱硫工艺的发展现状 认领
17
作者 刘玉凤 杨利芳 焦倩 《广州化工》 CAS 2020年第10期24-25,60,共3页
近年来,环境问题和能源危机日益突出。煤炭储量丰富、价格低廉,但煤炭燃烧后产生的硫化物污染问题十分严重,因此人们开发了各种脱硫工艺。介绍了当今广泛使用的脱硫工艺。煤气脱硫方法主要有干法脱硫和湿法脱硫。同时介绍了T.H法脱硫工... 近年来,环境问题和能源危机日益突出。煤炭储量丰富、价格低廉,但煤炭燃烧后产生的硫化物污染问题十分严重,因此人们开发了各种脱硫工艺。介绍了当今广泛使用的脱硫工艺。煤气脱硫方法主要有干法脱硫和湿法脱硫。同时介绍了T.H法脱硫工艺、F.R法脱硫工艺和P.D.S+栲胶脱硫脱氰技术三种典型的湿法脱硫工艺。 展开更多
关键词 煤炭 煤气脱硫 湿法脱硫
在线阅读 下载PDF
Theoretical description of drawing body shape in an inclined seam with longwall top coal caving mining 认领
18
作者 Jiachen Wang Weijie Wei Jinwang Zhang 《国际煤炭科学技术学报:英文版》 EI 2020年第1期182-195,共14页
Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining.In this study,both physical experiments and theoretical analysis are emplo... Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining.In this study,both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an inclined seam.By analyzing the initial positions of drawn marked particles,the characteristics of the drawing body shape for different seam dip angles are obtained.It is shown that the drawing body of the top coal exhibits a shape-difference and volume-symmetry characteristic,on taking a vertical line through the center of support opening as the axis of symmetry,the shapes of the drawing body on the two sides of this axis are clearly different,but their volumes are equal.By establishing theoretical models of the drawing body in the initial drawing stage and the normal drawing stage,a theoretical equation for the drawing body in an inclined seam is proposed,which can accurately describe the characteristics of the drawing body shape.The shape characteristics and volume symmetry of the drawing body are further analyzed by comparing the results of theoretical calculations and numerical simulations.It is shown that one side of the drawing body is divided into two parts by an inflection point,with the lower part being a variation development area.This variation development area increases gradually with increasing seam dip angle,resulting in an asymmetry of the drawing body shape.However,the volume symmetry coefficient fluctuates around 1 for all values of the seam dip angle variation,and the volumes of the drawing body on the two sides are more or less equal as the variation development volume is more or less equal to the cut volume.Both theoretical calculations and numerical simulations confirm that the drawing body of the top coal exhibits the shape-difference and volume-symmetry characteristic. 展开更多
关键词 Longwall top coal caving mining Inclined seam Top coal Drawing body shape Equation for drawing body
在线阅读 下载PDF
Molecular Organic Geochemical Characteristics and Coal Gas Potential Evaluation of Mesozoic Coal Seams in the Western Great Khingan Mountains 认领
19
作者 QU Yue SHAN Xuanlong +2 位作者 DU Tiantian DU XianLi ZHAO Rongsheng 《地质学报:英文版》 SCIE CAS CSCD 2020年第2期409-417,共9页
Coal-bearing strata are widespread in the western Great Khingan Mountains. Abundant coal resources have been found in the Jurassic Alatanheli Groups, the Cretaceous Bayanhua Groups, the Damoguaihe Formation and the Yi... Coal-bearing strata are widespread in the western Great Khingan Mountains. Abundant coal resources have been found in the Jurassic Alatanheli Groups, the Cretaceous Bayanhua Groups, the Damoguaihe Formation and the Yimin Formation. The organic geochemical characteristics were analyzed in combination with hydrocarbon source rock evaluation and molecular organic geochemistry experiments, and the coal gas potential of coal seams was evaluated. The source rock evaluation results indicated that the Mesozoic coal samples have the characteristics of high organic matter abundance(TOC>30%), low maturity(Ro values of approximately 0.6%), and type Ⅲ composition. The hydrocarbon generation potentials of the Alatanheli Groups and Bayanhua Groups are high, while the generation potentials of the Damoguaihe Formation and the Yimin Formation are low. The results of geochemistry show that the depositional environment of the coal seam was a lacustrine, oxidizing environment with a low salinity, and the source of the organic matter was mainly higher plants. Affected by weak degradation, the coal seams mainly formed low-maturity gas of thermal catalytic origin. The Cretaceous coal seams contain a large amount of phytoplankton groups deposited in a low-stability environment affected by a transgression event, and the potential range varied widely. For the Jurassic coal seams, the depositional environment was more stable, and the coal seams feature a higher coal-forming gas potential. 展开更多
关键词 COAL source rocks MOLECULAR organic matter geochemical characteristics low-maturity GAS COAL GAS western part of the GREAT Khingan MOUNTAINS
在线阅读 下载PDF
封存过程中CO2流体与煤中矿物作用关系研究进展 认领
20
作者 张登峰 李超 +1 位作者 李艳红 降文萍 《安全与环境学报》 CAS CSCD 北大核心 2020年第1期297-309,共13页
利用深部煤层封存二氧化碳(CO2),既能减排主要人为温室气体CO2,又能同步开采煤层气(主要成分为甲烷,即CH4)。在适宜CO2封存的含煤储层条件下,CO2属于超临界流体,其易与煤中部分无机矿物发生作用,进而改变煤的理化性质,最终影响煤层的CO... 利用深部煤层封存二氧化碳(CO2),既能减排主要人为温室气体CO2,又能同步开采煤层气(主要成分为甲烷,即CH4)。在适宜CO2封存的含煤储层条件下,CO2属于超临界流体,其易与煤中部分无机矿物发生作用,进而改变煤的理化性质,最终影响煤层的CO2封存效果。为此,归纳了煤中易与CO2发生作用的矿物分布特征,分析了CO2与矿物间的作用规律及其对煤理化性质的影响,并指出了后续研究方向。结果表明,煤中易与CO2流体发生作用的无机矿物主要包括碳酸盐矿物和黏土矿物。上述矿物的分布与煤变质程度和沉积环境有关。在封存过程中,超临界CO2流体与煤中矿物间的作用会改变煤体孔隙结构、煤的CO2吸附能力和含煤储层渗透率。针对CO2与煤中矿物的作用关系,后续需开展以下研究:CO2流体与煤中矿物之间的微观作用机理;CO2流体与煤层顶底板中主要无机矿物的作用规律;实际储层条件(温度、压力和地应力等)对CO2与矿物之间作用关系的影响;CO2与矿物之间的相互作用对同步采收CH4的影响。 展开更多
关键词 环境工程学 无机矿物 超临界流体 煤层 CO2封存
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈