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Underground coal gasification and its strategic significance to the development of natural gas industry in China 预览
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作者 ZOU Caineng CHEN Yanpeng +3 位作者 KONG Lingfeng SUN Fenjin CHEN Shanshan DONG Zhen 《石油勘探与开发:英文版》 2019年第2期205-215,共11页
Based on the present situation and trend of underground coal gasification in China and overseas, this article puts forward the basic concept, mechanism and mode of underground coal gasification, and presents the chall... Based on the present situation and trend of underground coal gasification in China and overseas, this article puts forward the basic concept, mechanism and mode of underground coal gasification, and presents the challenges, development potential and development path now faced. In China, underground coal gasification which is in accord with the clean utilization of coal can produce "artificial gas", which provides a new strategic approach to supply methane and hydrogen with Chinese characteristics before new energy sources offer large-scale supply. Coal measure strata in oil-bearing basins are developed in China, with 3.77 trillion tons coal reserves for the buried depth of 1000-3 000 m. It is initially expected that the amount of natural gas resources from underground coal gasification to be 272-332 trillion cubic meters, which are about triple the sum of conventional natural gas, or equivalent to the total unconventional natural gas resources. According to the differences of coal reaction mechanism and product composition of underground coal gasification, the underground coal gasification can be divided into three development modes, hydrogen-rich in shallow, methane-rich in medium and deep,supercritical hydrogen-rich in deep. Beyond the scope of underground mining of coal enterprises, petroleum and petrochemical enterprises can take their own integration advantages of technologies, pipeline, market and so on, to develop underground coal gasification business based on their different needs and technical maturity, to effectively exploit a large amount of coal resources cleanly and to alleviate the tight supply of natural gas. It can also be combined with using the produced hydrogen in nearby area and the CO2 flooding and storage in adjacent oil areas to create a demonstration zone for net zero emissions of petroleum and petrochemical recycling economy. It is significant for reserving resources and technologies for the coming "hydrogen economy" era, and opening up a new path for China’s "clean, low carbon, safe a 展开更多
关键词 COAL underground COAL GASIFICATION natural GAS GAS revolution coal-made methane coal-made hydrogen SUPERCRITICAL WATER SUPERCRITICAL WATER GASIFICATION
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Establishing a Relationship between Coal Quality and the Enrichment of Radionuclides in Coal Combustion Residues 预览
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作者 Uwais Al Qarni Ahmed Adriaan Joubert 《核科学与技术国际期刊(英文)》 2019年第3期113-126,共14页
Coal-fired power plants (CFPP) provide approximately 40% of the world’s energy demand. Naturally occurring radioactive materials (NORM) contained in coal become enriched in coal combustion residues as a result of the... Coal-fired power plants (CFPP) provide approximately 40% of the world’s energy demand. Naturally occurring radioactive materials (NORM) contained in coal become enriched in coal combustion residues as a result of the elimination of carbon during combustion. The fly ash and bottom ash produced from CFPP may be significant sources of exposure to naturally occurring radionuclides for the population near the combustion plant or ash dumps. Despite this fact, very few studies have actually addressed the relationship of the NORM enrichment factors and the quality of coal used. This paper aims to relate the quality of coal to the enrichment factors for the radionuclides of interest (K40, Ra226, Th232 and Po210) in coal combustion residues from three South African CFPP. The data from other CFPP was also taken into account to establish this correlation. The feedstock coal used in these CFPP is typically low quality, with ash content in the range of 25 - 45 wt%. The radionuclides investigated were determined by gamma spectrometry with the exception of Po210, which was determined by alpha spectrometry. The enrichment factors for the radionuclides of K40, Ra226, Th232 and Po210 in the fly ash and bottom ash (except Po210) was found to be directly proportional to the quality of coal. That is when the ash percentage increased (coal quality decreased) the enrichment factor decreased. The Po210 radionuclide in the bottom ash had an enrichment factor less than one. The relationship between coal quality and enrichment factors for the radionuclides of K40, Ra226, Th232 and Po210 in both the fly ash and bottom ash (except Po210 in the bottom ash) was demonstrated by the following mathematical equation: . This equation may be used as a good indication in obtaining an estimate in determining the enrichment of the mentioned radionuclides in coal combustion products such as fly ash and bottom ash. 展开更多
关键词 Radionuclides COAL ENRICHMENT FACTOR COAL QUALITY
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煤炭地下气化及对中国天然气发展的战略意义 预览 被引量:3
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作者 邹才能 陈艳鹏 +3 位作者 孔令峰 孙粉锦 陈姗姗 东振 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2019年第2期195-204,共10页
基于国内外煤炭地下气化技术发展现状与趋势,提出了煤炭地下气化基本概念、机理与模式,指出目前面临的挑战、发展潜力与发展路径。煤炭地下气化这一革命性技术能够实现'人工制气',且符合煤炭清洁利用方向,在新能源达到规模化供... 基于国内外煤炭地下气化技术发展现状与趋势,提出了煤炭地下气化基本概念、机理与模式,指出目前面临的挑战、发展潜力与发展路径。煤炭地下气化这一革命性技术能够实现'人工制气',且符合煤炭清洁利用方向,在新能源达到规模化供应之前,可开辟中国特色的有效供甲烷与氢气战略新途径。中国含油气盆地煤系发育,仅超出煤炭企业井工开采深度、埋深1 000~3 000 m的煤炭资源量即为3.77×1012 t,初步预计可气化煤炭折合天然气资源量为(272~332)×1012m3,是常规天然气资源量的3倍,与非常规天然气资源量的总和基本相当。根据煤炭地下气化反应机理和产物组分的差别,初步将煤炭地下气化分为'浅层富氢、中深层富甲烷、深层超临界极富氢'3种开发模式。石油石化企业可在煤炭企业井工开采范围之外,发挥自身技术、管道、市场等一体化优势,根据不同需求和相应技术成熟度,优选路径发展煤炭地下气化业务,可将大量煤炭资源进行有效清洁开发利用,缓解天然气供应紧张局面,还可结合产出氢气就近利用以及在邻近油区开展CO2驱油与埋存,打造石油石化循环经济净零排放示范区,为'氢经济'时代到来储备资源和技术,更为中国'清洁、低碳、安全、高效'的现代能源体系建设开辟新的途径。 展开更多
关键词 煤炭 煤炭地下气化 天然气 天然气革命 人工煤制甲烷 人工煤制氢气 超临界水 超临界水煤气化制氢
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Organic petrology and geochemistry of Triassic and Jurassic coals of the Tabas Basin, Northeastern/Central Iran 预览
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作者 Nazanin Zamansani Mohammad Ali Rajabzadeh +2 位作者 Ralf Littke Laura Zieger Alireza Baniasad 《国际煤炭科学技术学报:英文版》 2019年第3期354-371,共18页
Jurassic and Triassic coals and organic matter-rich shales of the Tabas Basin, Iran, were investigated with respect to their thermal maturation and petrographic composition. The Triassic coals of the Parvadeh coal fie... Jurassic and Triassic coals and organic matter-rich shales of the Tabas Basin, Iran, were investigated with respect to their thermal maturation and petrographic composition. The Triassic coals of the Parvadeh coal field range in vitrinite reflectance between 1.17% and 1.37% and the Jurassic coals of the Mazino coal field between 2.08% and 2.29% VRr. Maceral analysis revealed a predominance of vitrinite in all samples, with slightly higher percentages of inertinite in the Jurassic samples. Rock-Eval analyses confirm the presence of type III kerogen in the Triassic coals, while the Jurassic coals contain strongly carbonized residual kerogen. The range of sulfur contents for coals from the Parvadeh coal field (0.37% to 4.64%) and Mazino coal field (0.45% to 2.92%) is related to the effect of marine water in peat. The studied samples are characterized by the predominance of short- over long-chained n-alkanes. The relatively high Pr/Ph ratios indicate predominance of terrestrial organic matter whereas Pr/n-C17 and Ph/n-C18 ratios prove oxic conditions during deposition. In addition, the DBT/Phen ratio shows that these coals formed in fluvial/deltaic environments. Molecular geochemical parameters such as carbon preference index (CPI, 0.99-1.04), methyl phenanthrene index (MPI, 1.20-1.60), methyl naphthalene ratio (MNR, 1.61-3.45), and ethyl naphthalene ratio (ENR, 4-6.78) confirm the high maturity of the samples. Burial and thermal history reconstruction indicates necessity of an erosional thickness of about 4000 m in the Parvadeh area. Towards the Mazino area, a higher basal heat flow up to 80 mW m^-2 is assumed for the Paleogene leading to higher maturities. 展开更多
关键词 JURASSIC COAL TRIASSIC COAL VITRINITE reflectance MACERAL Organic GEOCHEMISTRY COAL petrography
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Analysis and Design Innovation on Underground Gasifier for Medium-Deep Coal Seam 预览
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作者 Kong Lingfeng Zhan Enqiang Zhao Chenhui 《中国油气:英文版》 CAS 2019年第4期32-37,共6页
Over the past 80 years,dozens of underground coal gasification(UCG)mine field tests have been carried out around the world.However,in the early days,only a small number of shallow UCG projects in the former Soviet Uni... Over the past 80 years,dozens of underground coal gasification(UCG)mine field tests have been carried out around the world.However,in the early days,only a small number of shallow UCG projects in the former Soviet Union achieved commercialised production.In this century,a few pilot projects in Australia also achieved short-term small-scale commercialised production using modern UCG technology.However,the commercialisation of UCG,especially medium-deep UCG projects with good development prospects but difficult underground engineering conditions,has not progressed smoothly around the world.Considering investment economy,a single gasifier must realise a high daily output and accumulated output,as well as hold a long gasification tunnel to control a large number of coal resources.However,a long gasification tunnel can easily be affected by blockages and failure,for which the remedial solutions are difficult and expensive,which greatly restricts the investment economy.The design of the underground gasifier determines the success or failure of UCG projects,and it also requires the related petroleum engineering technology.Combining the advantages of the linear horizontal well(L-CRIP)and parallel horizontal well(P-CRIP),this paper proposes a new design scheme for an“inclined ladder”underground gasifier.That is to say,the combination of the main shaft of paired P-CRIP and multiple branch horizontal well gasification tunnels is adopted to realise the control of a large number of coal resources in a single gasifier.The completion of the main shaft by well cementation is beneficial for maintaining the integrity of the main shaft and the stability of the main structure.The branch horizontal well is used as the gasification tunnel,but the length and number of retracting injection points are limited,effectively reducing the probability of blockage or failure.The branch horizontal well spacing can be adjusted flexibly to avoid minor faults and large cracks,which is conducive to increasing the resource utilisation rate.In add 展开更多
关键词 UNDERGROUND COAL Gasification(UCG) Medium-deep COAL Seam Controlled Retracting Injection Point(CRIP) Parallel HORIZONTAL WELL Pair Branch HORIZONTAL WELL “Inclined Ladder”Underground GASIFIER Cluster Coiled Tubing Flexible and Combustible Tubing GASIFICATION Tunnel GASIFICATION Chamber Coal-based Syngas
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兖矿“蓝天工程”是治理锅炉、窑炉和民用燃煤问题的有效途径 预览
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作者 王振平 孟磊 王瑞东 《煤炭加工与综合利用》 CAS 2019年第6期1-5,I0001共6页
兖矿“蓝天工程”致力于解决居民生活清洁供暖、农业生产及小区域集中清洁供暖、中小型工业锅炉超低排放等难题,突破七项技术,形成四大应用领域;兖煤蓝天清洁能源公司建成了年产100万t洁净煤、50万t高效复合添加剂、10万台解耦环保炉具... 兖矿“蓝天工程”致力于解决居民生活清洁供暖、农业生产及小区域集中清洁供暖、中小型工业锅炉超低排放等难题,突破七项技术,形成四大应用领域;兖煤蓝天清洁能源公司建成了年产100万t洁净煤、50万t高效复合添加剂、10万台解耦环保炉具生产线,并取得了很好的推广应用效果,烟煤燃烧效率高,固硫效果好,烟尘,SO2、NOx、CO大幅度减排。 展开更多
关键词 煤炭 清洁高效利用 散煤治理 洁净煤 环保炉具 污染物控制
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我国煤制燃料油技术进展及工业化现状 预览
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作者 胡发亭 颜丙峰 +2 位作者 王光耀 谷小会 常秋连 《洁净煤技术》 CAS 2019年第1期57-63,共7页
我国富煤贫油少气,以煤为原料生产清洁燃料油具有重要意义。为实现我国煤制燃料油产业健康有序快速发展,论述了煤直接液化、煤间接液化、煤油共炼3种煤制燃料油技术的定义、原理以及工艺流程,概述了煤制燃料油技术在我国的发展历程、技... 我国富煤贫油少气,以煤为原料生产清洁燃料油具有重要意义。为实现我国煤制燃料油产业健康有序快速发展,论述了煤直接液化、煤间接液化、煤油共炼3种煤制燃料油技术的定义、原理以及工艺流程,概述了煤制燃料油技术在我国的发展历程、技术研究进展及工业化应用现状。对3种煤制燃料油技工业应用过程中存在的问题、技术难点进行分析,并展望了应用前景。3种煤制燃料油技术在我国均已建成工业示范项目,步入了商业化发展阶段,煤直接液化和煤油共炼由于技术和原料的特殊性,目前均只是建设了一套工业示范装置,而我国已投产或试车成功的煤间接液化项目有10个左右,总产能近千万吨。煤直接液化技术吨油煤耗小,投资和运行成本低,今后应重点提高循环溶剂的质量和数量;煤间接液化技术成熟,是我国重点推广的煤制燃料油技术,未来的发展趋势是拓展产品种类,提高产品附加值;在同时具备适合液化的煤和重质油资源的企业适宜发展煤油共炼产业。国家应加大煤制油研发投入,重点解决目前存在的水耗、能耗、碳排放高等问题,并给予政策支持,促进煤制油产业快速发展,保障国家能源安全。以规划为先导,积极稳妥发展煤制燃料油产业,是煤炭行业未来发展的新格局新趋势。 展开更多
关键词 燃料油 直接液化 间接液化 煤油共炼
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2018年煤炭供需形势分析及2019年展望 预览
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作者 肖新建 《中国能源》 2019年第2期9-12,共4页
2018年,煤炭先进产能释放加快,全国煤炭生产量和净进口量均较快增长,库存总体上升;在电力行业拉动作用下,煤炭消费呈现较强增长;全年煤炭价格稳定,煤炭企业经营形势稳中向好,煤炭采选业固定资产投资回暖。全国煤炭经济运行平稳,但数据... 2018年,煤炭先进产能释放加快,全国煤炭生产量和净进口量均较快增长,库存总体上升;在电力行业拉动作用下,煤炭消费呈现较强增长;全年煤炭价格稳定,煤炭企业经营形势稳中向好,煤炭采选业固定资产投资回暖。全国煤炭经济运行平稳,但数据显示供需存在较大缺口,需从供需两侧进行认真审视。展望2019年,全国煤炭需求增长不会如2018年乐观,煤炭生产有望进一步释放,煤炭供需将相对宽松。建议2019年完善相关制度,重点做好煤炭消费总量控制工作。 展开更多
关键词 煤炭 消费较强增长 价格稳定 供需两侧 控制总量
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Effect of Particle Size on Gasification Reactivity of Different Rank Coal Chars 预览
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作者 Li Wenxiu Rong Ling Kun Jia Feng Jun 《环境科学前沿:中英文版》 2019年第1期8-12,共5页
In the current research process of coal rank char gasification reaction in China, it is found that particle size has different influence on the gasification reactivity of coal char of different ranks. Therefore, monod... In the current research process of coal rank char gasification reaction in China, it is found that particle size has different influence on the gasification reactivity of coal char of different ranks. Therefore, monodisperse pulverized coal was prepared from eight kinds of coal chars of different ranks in entrained-flow gasifier. The particle size and gasification temperature of coal char were analyzed for these samples. The degree of influence of carbon dioxide gasification reaction. Through research and analysis, the performance differences of these samples under different carbon conversion rates were compared, and the sample reaction under high carbon conversion rates was discussed. The experimental results show that the orderliness of the microcrystalline structure of coal char is directly proportional to the rank of coal, while the gasification activity of coal char is inversely proportional to the rank of coal. Therefore, for different coal ranks, the influence of coal char particle size on coal char gasification reaction is different. According to the experiments, smaller coal char size and higher gasification temperature can promote the reactivity of higher-order coal gasification. In order to clarify the correlation between particle size and gasification reactivity of coal chars with different ranks, this paper discussed this issue. 展开更多
关键词 Particle Size DIFFERENT RANKS of COAL GASIFICATION Activity of COAL CHAR
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Non-isothermal thermogravimetric investigation on mutual effect between bituminite and anthracite in blends for blast furnace injection
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作者 Yun-fei Wu Qing-hai Pang +3 位作者 Zhi-jun He Teng-fei Song Wen-long Zhan Jun-hong Zhang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第8期818-828,共11页
In order to clarify the mutual effect between bituminite and anthracite in blends during industrial combustion, the influence of particle size and heating rate as well as oxygen concentration in atmosphere was analyze... In order to clarify the mutual effect between bituminite and anthracite in blends during industrial combustion, the influence of particle size and heating rate as well as oxygen concentration in atmosphere was analyzed. The results of non-isothermal thermogravimetric analysis indicated that the combustion behavior of blends was of great difference though blends were prepared with the same volatile content of 20%. The catalysis of bituminite to anthracite changed with the thermal and kinetic condition of combustion reaction, and consequently, blends with different collocations were suitable for various combustion environments. Superior combustion properties of some blends were achieved at high heating rates, while others might react faster under high oxygen-enriched atmosphere. Simultaneously, the volume model and unreacted core model as well as random pore model were introduced to fit the experimental data. The kinetic calculation results showed that the combustion of blends at different heating rates all agreed better with that of random pore model in comparison with the other two models, while the apparent activation energy of samples all decreased with the increase in heating rate. The similarity of functional group structure between bituminite and anthracite is closely related to the accordance in com-bustion stage of bituminite and anthracite in blends. 展开更多
关键词 Pulverized COAL injection COAL BLEND Mutual EFFECT Kinetics Activation energy Bituminite ANTHRACITE
我国块煤市场分析研究 预览
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作者 杨芊 《煤炭加工与综合利用》 CAS 2019年第4期75-80,I0001共7页
分析了全国煤炭市场现状,重点研究了2015年我国建筑陶瓷、耐火材料、玻璃、氧化铝、化工、兰炭、合成氨、民用8个领域的块煤消费情况;提出增加块煤生产将会给煤炭企业带来更多利润的建议,预测国内块煤消费市场将由2015年的3.91亿t,降低... 分析了全国煤炭市场现状,重点研究了2015年我国建筑陶瓷、耐火材料、玻璃、氧化铝、化工、兰炭、合成氨、民用8个领域的块煤消费情况;提出增加块煤生产将会给煤炭企业带来更多利润的建议,预测国内块煤消费市场将由2015年的3.91亿t,降低到“十三五”末期的3.46亿t以下。 展开更多
关键词 煤炭 块煤 市场分析 消费预测
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煤炭行业发展历程及展望 预览
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作者 刘新杰 宋高峰 蒋斌 《矿业安全与环保》 北大核心 2019年第3期100-103,112共5页
中国煤炭产量处于不断优化调整期,煤炭价格日趋平稳,煤炭开采逐步进入绿色、安全、高效和有序状态,煤炭利用步入清洁、低碳的发展轨道。通过分析近 10 年中国能源生产结构、电煤价格指数、采矿行业工资及科研方向,表明煤炭所占国家能源... 中国煤炭产量处于不断优化调整期,煤炭价格日趋平稳,煤炭开采逐步进入绿色、安全、高效和有序状态,煤炭利用步入清洁、低碳的发展轨道。通过分析近 10 年中国能源生产结构、电煤价格指数、采矿行业工资及科研方向,表明煤炭所占国家能源比重将会进一步降低,但仍是主要能源,能源结构将呈现煤、油、天然气、无碳能源(水电、风电、核电等)四足鼎立的格局。煤炭开发过程更加注重绿色开采和社会责任,煤炭行业待遇偏低,理应尽快建立竞争有序的煤炭市场体系,促使煤炭行业成为人才向往的行业。 展开更多
关键词 煤炭 绿色开采 低碳 电煤价格指数 能源生产结构
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Quantitative hazard assessment for Zonguldak Coal Basin underground mines 预览
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作者 H.H.Erdogan H.S.Duzgun A.S.Selcuk-Kestel 《矿业科学技术学报:英文版》 CSCD 2019年第3期453-467,共15页
Underground coal mining is one of the most dangerous occupations throughout the world.The reasons behind an underground occupational accident are too complex to analyze mainly due to many uncertainties which may arise... Underground coal mining is one of the most dangerous occupations throughout the world.The reasons behind an underground occupational accident are too complex to analyze mainly due to many uncertainties which may arise from geological,operational conditions of the mine or individual characteristics of employees.This study proposes implementing a quantitative methodology for the analysis and assessment of hazards associated with occupational accidents.The application of the proposed approach is performed on the mines of Turkish Hard Coal Enterprises(TTK).The accidents in TTK between the years 2000 and 2014 are firstly statistically analyzed with respect to the number,type and location of accidents,age,experience,education level and main duty of the casualties and also injuries resulting from such accidents.The hazards are classified as individual,operational and locational hazards and quantified using contingency tables,conditional and total probability theorems.Lower and upper boundaries of hazards are determined and event trees for each hazard class are prepared.Total hazard evaluation results show that Armutcuk,Karadon and Uzulmez mines have relatively high hazard levels while Amasra and Kozlu mines have relatively lower hazard values. 展开更多
关键词 UNDERGROUND COAL mining OCCUPATIONAL accidents HAZARD assessment CONTINGENCY TABLES Zonguldak COAL Basin
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A study of mining fatalities and coal price variation 预览
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作者 P.Knights B.Scanlan 《矿业科学技术学报:英文版》 CSCD 2019年第4期599-602,共4页
It has long been postulated that a relationship exists between commodity price cycles and fatalities in the mining industry.Previous studies have found only weak correlations in this area.This study analyses the fatal... It has long been postulated that a relationship exists between commodity price cycles and fatalities in the mining industry.Previous studies have found only weak correlations in this area.This study analyses the fatalities recorded in coal mines over the period 1985-2016 in the State of Queensland as a function of thermal coal price variation.The study finds that the relationship between fatalities and coal prices is not linear.One to two fatalities occur in most years independent of the thermal coal price.When the price of coal falls below AUD 55/tonne(non-inflation adjusted),the likelihood of an incident involving multiple fatalities increases.The probability can be estimated at 2 in 18 events(equivalent to 11%).This paper postulates that in difficult economic times,mining companies react by downsizing direct employees.If not carefully managed,this can result in loss of knowledge around safety systems,and reduced effectiveness of safety supervision.Because of labour cost advantages,some jobs previously undertaken by direct employees will be replaced by contractors.Increased contractor numbers contribute to increased risk of fatalities occurring,as contractors are over-represented in accident categories involving vehicle accidents,tire handling and crushing incidents.Mine inspectorates,mining,and mining contractor companies need to be especially vigilant to enforce health and safety management systems during periods of low coal prices. 展开更多
关键词 COAL MINING fatalities COAL PRICES Queensland AUSTRALIA
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岩浆侵入煤层中锑的赋存特征——以淮北卧龙湖矿为例 预览
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作者 欧金萍 郑刘根 +4 位作者 魏祥平 刘思魁 李立园 刘梦 黄晓雨 《煤田地质与勘探》 CAS CSCD 北大核心 2019年第4期63-68,共6页
为探讨岩浆蚀变作用对煤层中锑赋存特征的影响,系统采集安徽淮北煤田卧龙湖煤矿岩浆侵入煤层侵入岩和全煤层样品共12个,利用原子荧光光谱法(AFS)测定样品中Sb含量,并对煤质参数进行分析。结果表明:卧龙湖煤矿岩浆侵入区煤表现为超低挥发... 为探讨岩浆蚀变作用对煤层中锑赋存特征的影响,系统采集安徽淮北煤田卧龙湖煤矿岩浆侵入煤层侵入岩和全煤层样品共12个,利用原子荧光光谱法(AFS)测定样品中Sb含量,并对煤质参数进行分析。结果表明:卧龙湖煤矿岩浆侵入区煤表现为超低挥发分,中等灰分,特低硫的特点,煤中的硫主要以有机硫和黄铁矿硫存在。受岩浆热液影响,煤中灰分增加,挥发分减少;岩浆蚀变煤层中锑明显富集,算术平均值达到10.48mg/kg,且侵入岩上方煤中Sb的平均含量明显增高,煤岩接触带位置Sb的含量达到最高值(13.93 mg/kg);岩浆蚀变煤中的锑主要以无机结合态形式存在(相关系数r为0.74),有机硫与煤中Sb呈显著负相关(相关系数r为–0.60)。岩浆侵入作用导致卧龙湖煤矿煤的煤质特征及煤层中锑的赋存方式受到不同程度的影响,研究结果可为特殊地质作用下煤中锑的环境地球化学特征提供参考。 展开更多
关键词 锑(Sb) 赋存状态 岩浆侵入 淮北卧龙湖煤矿
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Numerical modelling of strength and energy release characteristics of pillar-scale coal mass 预览
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作者 Onur Vardar Chengguo Zhang +1 位作者 Ismet Canbulat Bruce Hebblewhite 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第5期935-943,共9页
Coal burst is a manifestation of rapid energy release,which is considered as one of the most critical operational hazards in underground coal mines.This study numerically investigates the effects of discontinuities on... Coal burst is a manifestation of rapid energy release,which is considered as one of the most critical operational hazards in underground coal mines.This study numerically investigates the effects of discontinuities on the strength and energy release characteristics of coal mass samples under uniaxial compression.The universal distinct element code(UDEC)was used to model pillar-scale coal mass samples that were represented by an assembly of triangular deformable blocks,and pre-existing discontinuities such as bedding planes and cleats were also included in the models.It shows that cleat spacing can have a significant impact on compressive strength and energy release,with both strength and energy release(magnitude and rate)reducing as the number of cleats was increased.This work is one of the first attempts to numerically model and quantify the energy release which occurs during the failure of pillar-scale coal mass samples with varying cleat densities.The insights from the numerical modelling can help to understand the possible energy release mechanisms and associated coal burst potential in changing coal cleat conditions. 展开更多
关键词 COAL BURST COAL cleating Energy release DISTINCT element method(DEM) Numerical MODELLING
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微波辐射用于处理和开采岩石的研究进展 预览
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作者 杨兆中 朱静怡 +1 位作者 李小刚 刘紫微 《科学技术与工程》 北大核心 2019年第5期1-7,共7页
微波辐射具有加热速度快、选择性加热、体积式加热、易于控制、高效、安全等特点。针对目前岩石破碎高成本高能耗、煤层气和油页岩无法高效开发等缺点,详细介绍和评述了微波辐射在处理和开采岩石中的应用。分析表明,微波辐射可以在岩石... 微波辐射具有加热速度快、选择性加热、体积式加热、易于控制、高效、安全等特点。针对目前岩石破碎高成本高能耗、煤层气和油页岩无法高效开发等缺点,详细介绍和评述了微波辐射在处理和开采岩石中的应用。分析表明,微波辐射可以在岩石内部诱导产生热应力,进一步产生和延伸岩石内部的裂缝,从而达到预处理岩石和煤岩的作用;微波对煤岩有脱硫的作用;微波还可以加热煤层气和油页岩,帮助煤层气解析和油页岩的热解,从而对两种非常规油气资源进行原位开采。总结认为,精确描述不同岩石的介电特性、优化微波辐射的功率和时间、建立计算机数值模型并考虑化学反应的影响、研发大规模微波发生器下入井下是今后的发展方向。 展开更多
关键词 微波辐射 岩石 煤层气 油页岩
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煤泥浮选过程中粒度对泡沫性质的影响
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作者 谭佳琨 梁龙 +1 位作者 彭耀丽 谢广元 《中国矿业大学学报》 EI CAS CSCD 北大核心 2019年第1期195-203,共9页
针对复杂的三相浮选泡沫,探索了不同粒度煤炭颗粒在浮选过程中产率和灰分的变化规律及其对浮选泡沫性质的影响.将煤炭浮选入料分为粗(500~250μm)、中(250~74μm)、细(-74μm)3个粒级分别进行单独和混合浮选,在入料性质不同而操作条件... 针对复杂的三相浮选泡沫,探索了不同粒度煤炭颗粒在浮选过程中产率和灰分的变化规律及其对浮选泡沫性质的影响.将煤炭浮选入料分为粗(500~250μm)、中(250~74μm)、细(-74μm)3个粒级分别进行单独和混合浮选,在入料性质不同而操作条件相同的情况下,分析各粒级煤炭的浮选精煤产率和灰分,以及相应的浮选泡沫性质,包括水回收率、均一性(气泡尺寸)、破裂气泡尺寸、破裂气泡个数和泡沫速度等.结果表明:粗颗粒的浮选精煤产率明显受到细颗粒的影响,加入细颗粒后产率从30%升高到60%,但粗颗粒精煤灰分基本不变;细颗粒的浮选产率独立性好,基本不受粗颗粒和中颗粒的影响,但细颗粒精煤灰分随粗颗粒和中颗粒的加入而升高.通过对浮选泡沫性质的分析,发现粗颗粒促使气泡破裂并破坏泡沫的稳定性,中颗粒能够显著提高泡沫速度,而细颗粒能够增强泡沫稳定性并且降低泡沫速度.当浮选入料性质,即颗粒粒度改变时,各浮选泡沫性质与精煤灰分的相关性规律与入料性质不变而操作条件改变的常规浮选不同,主要是由不同粒度颗粒的特性差异所导致. 展开更多
关键词 浮选 泡沫特性 颗粒粒度 精煤灰分
重介洗煤系统密度控制分析 预览
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作者 田鹏 《能源与节能》 2019年第11期151-152,共2页
介质密度是影响重介洗选工艺效果的重要参数,提升其控制稳定性,对于提高洗选产品质量意义重大。以此为着手点,针对重介洗煤系统密度控制开展探究。结合具体工程实际,在分析重介洗选密度控制系统构成的基础上,深入探究了介质密度控制原理... 介质密度是影响重介洗选工艺效果的重要参数,提升其控制稳定性,对于提高洗选产品质量意义重大。以此为着手点,针对重介洗煤系统密度控制开展探究。结合具体工程实际,在分析重介洗选密度控制系统构成的基础上,深入探究了介质密度控制原理,并总结了系统的特点,希望能够为其他煤矿选煤厂相似工程的开展提供参考和借鉴。 展开更多
关键词 煤炭 重介洗煤 密度控制 优化设计
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Geophysical criterion of pre-outburst coal outsqueezing from the face space into the working 预览
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作者 Alexander Shadrin Yuliya Diyuk 《矿业科学技术学报:英文版》 CSCD 2019年第3期499-506,共8页
The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future... The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future outburst cavity in a jump-like manner into the working.Geo-mechanical criterion for a part of a coal seam layer outsqueezing in the form of the relation of active(squeezing out)and passive(preventing the outsqueezing)forces is defined in the article.Based on it,the geophysical criterion is defined by expressing basic physical parameters through geo-physical ones:the current stress is defined by spectral-acoustic method through the ratio of high frequency and low-frequency components of an acoustic signal,which is generated into a face working space by the mining equipment operating in the face;in-situ gas pressure is defined by gas analytical method by the concentration of methane in the atmosphere of the working;the strength of the most broken coal layer is defined by a strength measuring device(a device for measuring the depth of a steal cone punched into the coal by a spring mechanism).This paper studies the influence of acoustic,strength and filtrating and collecting properties of a face working space on the limit value of an obtained geophysical criterion of pre-outburst squeezing of a coal‘‘plug”out of the mouth of the future outburst cavity into the working. 展开更多
关键词 Block-like structure CRITERION of a COAL section outsqueezing Spectral-acoustic method Stress condition COAL strength property IN-SITU GAS pressure Aero and GAS control equipment METHANE concentration
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