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| 1 | Advances in gas content based on outburst control technology in Huainan, China显示文摘The sudden and violent nature of coal and gas outbursts continues to pose a serious threat to coal mine safety in China. One of the key issues is to predict the occurrence of outbursts. Current methods that are used for predicting the outbursts in China are considered to be inadequate, inappropriate or impractical in some seam conditions. In recent years, Huainan Mining Industry Group(Huainan) in China and the Commonwealth Scientific and Industrial Research Organisation(CSIRO) in Australia have been jointly developing technology based on gas content in coal seams to predict the occurrence of outbursts in Huainan. Significant progresses in the technology development have been made, including the development of a more rapid and accurate system in determining gas content in coal seams, the invention of a sampling-while-drilling unit for fast and pointed coal sampling, and the coupling of DEM and LBM codes for advanced numerical simulation of outburst initiation and propagation. These advances are described in this paper. | Xue Sheng Yuan Liang Xie Juna Wang Yucang | 2014 | International Journal of Mining Science and Technology2014，24，3： | 10 |
| 2 | Multiple linear equation of pore structure and coal–oxygen diffusion on low temperature oxidation process of lignite显示文摘This work aimed at studying the feasibility of calculating the coal–oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the fractal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area fractal dimension and porosity was investigated, and multiple linear equation of the coal–oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validity of the model. The research provides a theoretical basis for the prediction model of coal–oxygen diffusion law. | Xianliang Meng Mingqiang Gao Ruizhi Chu Guoguang Wu Qiang Fang | 2016 | Chinese Journal of Chemical Engineering2016，24，6： | 6 |
| 3 | Infrared measurement of temperature field in coal gas desorption显示文摘In order to reveal the temperature change in coal gas desorption process,the temperature variation in coal gas desorption process under different particle sizes is analyzed with infrared thermal imager.The infrared video signals obtained by the experiment are processed with SAT.Then the infrared radiation signals are processed by EMD with Hilbert–Huang and the infrared radiation noise is effectively removed.The research results show that the desorption process,with the change of the temperature,is an endothermic process.The coal absorbs heat when the gas is desorbed and the temperature drops.The coal body temperature drop range is obviously related to coal particle size.The smaller the particle size is,the bigger the temperature drop becomes.The temperature variation curves in the process of coal gas desorption under different particle sizes are fitted,and they comply with the exponential function.The research results lay the theoretical and experimental foundation for non-contact prediction on working face of coal and gas outburst with infrared thermal image technology. | Liu Jikun Wang Cuixia He Xueqiu Li Shugang | 2014 | International Journal of Mining Science and Technology2014，24，1： | 6 |
| 4 | 低煤阶煤中甲烷扩散性能分析显示文摘甲烷在煤基质中的扩散性能是影响煤层气产出的重要储层参数。采用云南东南部地区新近系中新统小龙潭组褐煤样品,开展了低煤阶煤中甲烷等温吸附实验。基于等温吸附实验获得的吸附量与时间的关系数据,应用一元孔隙结构气体非稳态扩散模型,计算了煤中甲烷气体扩散系数,揭示了煤中甲烷扩散规律和控制机理。研究结果表明,低煤阶煤中气体扩散规律服从Langmuir方程,煤中甲烷有效扩散系数和扩散系数随着压力的增高而增大;吸附时间常数随着压力的增高而减小,服从负指数函数规律。4个实验煤样Langmuir有效扩散系数和扩散系数分别是(1.71~5.46)×10^(-4) s^(-1)和(2.17~6.91)×10^(-12) m^2/s,Langmuir压力为0.63~1.97MPa。在相同温度和压力条件下,干燥煤样的有效扩散系数和扩散系数大于平衡水分煤样,随着温度的增高,其有效扩散系数和扩散系数增加,煤中气体扩散性能增强。 | 孟召平 张贵元 李国庆 刘金融 | 2019 | 煤田地质与勘探2019，47，2： | 3 |
| 5 | 天然气扩散系数研究现状及存在问题显示文摘天然气扩散系数表征天然气在地层中的扩散能力,是油气藏盖层封堵性能、油气保存条件与油气资源潜力评价的重要参数,确定其符合地层条件的数值并提高精度,对油气勘探具有重要理论意义和实用价值。目前获取方法主要是实验模拟和数值模拟2种。前人研究表明,温压条件、岩石物性条件和孔隙流体性质是影响天然气扩散系数的主要因素。在实验室扩散系数测定过程中,温压条件的设置普遍低于地层实际情况,多会在饱和介质与温度条件方面进行系数校正,这影响了逼近实际地层条件的真实性。在数值模拟中,一些参数的设定仍然依赖于实验所得,不同模式的数学扩散模拟在实际中难以应用。通过文献资料分析认为,梳理实验室测定的扩散系数计算方法,总结现阶段天然气扩散系数研究的主要校正措施及天然气扩散的数值模拟现状,对存在的问题进行系统分析并强化天然气扩散系数测定装置与系统性能,可以有效提高天然气扩散系数测定的准确性;加强目标地层孔隙度与扩散模式研究并基于扩散模式采用相应的扩散系数计算方法,可以提高数值模拟结果精度。实验模拟与分子动力学融合将是今后实现天然气扩散系数准确获取的主要研究方向。 | 王国建 袁玉松 李武 吴传芝 邹雨 卢丽 李凤丽 | 2021 | 天然气地球科学2021，32，3： | 2 |
| 6 | 考虑流固耦合作用的瓦斯运移规律研究现状显示文摘针对考虑流固耦合的瓦斯运移问题,本文基于对前人研究的分析,总结了关于含瓦斯煤体的有效应力原理及瓦斯运移机理的研究成果。指出了研究中存在的主要问题,得出了以下结论:1关于煤与瓦斯的有效应力原理,亟需给出吸附膨胀应力及孔隙压力的分担比例;2关于瓦斯在煤体中的运移机理,应考虑如何在瓦斯的运移过程中彻底地区分扩散和渗透过程。 | 吕伏 徐曾和 梁冰 | 2015 | 中国矿业2015，24，6： | 1 |
| 7 | Time-varying diffusion characteristics of different gases in coal particles显示文摘Based on the analytical solution of gas diffusion in spherical coal particles with a constant diffusion coefficient, a calculation method of time-varying diffusion coefficient is proposed by constructing objective function. The time-varying diffusion behavior of methane, nitrogen and carbon dioxide in the coal particles was studied. The results show that with the increase of diffusion time, the diffusion coefficients of methane, nitrogen and carbon dioxide gas in the coal particles exhibit an attenuation characteristic, eventually approaching a limit value individually. The diffusion coefficient of carbon dioxide is larger than methane, and the diffusion coefficient of nitrogen is smallest. Significant phenomenon of limited diffusion was observed for coal of strong adsorption capability. Through the analysis of the diffusion coefficient of gases at different diffusion time, a mathematical model describing the time-varying diffusion characteristic of gases is obtained. The implementation of mixed gases to replace coal bed methane has a very important practical significance. | Long Qingming Hu Qianting Cheng Bo | 2017 | International Journal of Mining Science and Technology2017，27，6： | 0 |
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