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International Journal of Mining Science and Technology 2013年第2期23卷 211-215页

作者： Wang Liguo cheng yuanping Li Wei Lu Shouqing Xu Chao National Engineering Research Center for Coal & Gas Control School of Safety Engineering China University of Mining & Technology Key Laboratory of Coal-Based CO2 Capture and Geological Storage

Adsorption-desorption experiments on CO2-CH4 gas mixtures with varying compositions have been conducted to study the fractionation characteristics of CO2-CH4 on Haishiwan coal samples. These were carried out at constant temperature but different equilibrium pressure conditions. Based on these experimental results, the temporal evolution of component fractionation in the field was investigated. The results show that the CO2 concentration in the adsorbed phase is always greater than that in the original gas mixture during the desorption process, while CH4 shows the opposite characteristics. This has confirmed that CO2 , with a greater adsorption ability has a predominant position in the competition with CH4 under different pressures. Where gas drainage is employed, the ratio of CO2 to CH4 varies with time and space in floor roadways used for gas drainage, and in the ventilation air in Nos.1 and 2 coal seams, which is consistent with laboratory results.

关键词： Binary-component gas Adsorption–desorption Component fractionation Temporal evolution

Prediction method for risks of coal and gas outbursts based on spatial chaos theory using gas desorption index of drill cuttings

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Mining Science and Technology 2011年第3期21卷 439-443页

作者： Li Dingqi cheng yuanping Wang Lei Wang Haifeng Wang Liang Zhou Hongxing National Engineering Research Center for Coal Gas Control China University of Mining ＆ Technology Xuzhou 221008 China Safety Engineering Institute Heilongjiang Science ＆ Technology Harbin 150027 China

Based on the evolution of geological dynamics and spatial chaos theory, we proposed the advanced prediction an advanced prediction method of a gas desorption index of drill cuttings to predict coal and gas outbursts. We investigated and verified the prediction method by a spatial series data of a gas desorption index of drill cuttings obtained from the 113112 coal roadway at the Shitai Mine. Our experimental results show that the spatial distribution of the gas desorption index of drill cuttings has some chaotic charac- teristics, which implies that the risk of coal and gas outbursts can be predicted by spatial chaos theory. We also found that a proper amount of sample data needs to be chosen in order to ensure the accuracy and practical maneuverability of prediction. The relative prediction error is small when the prediction pace is chosen carefully. In our experiments, it turned out that the optimum number of sample points is 80 and the optimum prediction pace 30. The corresponding advanced prediction pace basically meets the requirements of engineering applications.

关键词： Chaos theory Spatial series Coal and gas outburst prediction Gas desorption index of drill cuttings

Sponge Effect on Coal Mine Methane Separation Based on Clathrate Hydrate Method

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Chinese Journal of Chemical Engineering 2011年第4期19卷 610-614页

作者： ZHANG Baoyong cheng yuanping WU Qiang National Engineering Research Center for Coal Gas Control China University of Mining & Technology Xuzhou 221008 China Department of Safety Engineering Heilongjiang Institute of Science & Technology Harbin 150027 China

The findings were presented from laboratory investigations on the hydrate formation and dissociation processes employed to recover methane from coal mine *** separation process of coal mine methane(CMM) was carried out at 273.15K under 4.00 *** key process variables of gas formation rate,gas volume stored in hydrate and separation concentration were closely investigated in twelve THF-SDS-sponge-gas systems to verify the sponge effect in these hydrate-based separation *** gas volume stored in hydrate is calculated based on the measured gas *** CH4 mole fraction in hydrate phase is measured by gas chromatography to confirm the separation *** close examination of the overall results,it was clearly verified that sponges with volumes of 40,60 and 80 cm 3 significantly increase gas hydrate formation rate and the gas volume stored in hydrate,and have little effect on the CH4 mole fraction in hydrate *** present study provides references for the application of the kinetic effect of porous sponge media in hydrate-based *** will contribute to CMM utilization and to benefit for local and global environment.

关键词： coal mine methane separation clathrate hydrate sponge porous media mass transfer

Definition, theory, methods, and applications of the safe and efficient simultaneous extraction of coal and gas

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International Journal of Coal Science & Technology 2015年第1期2卷 52-65页

作者： yuanping cheng Liang Wang Hongyong Liu Shengli Kong Jintuo Zhu Qingyi Tu National Engineering Research Center for Coal Gas Control China University of Mining & Technology Xuzhou 221116China School of Safety Engineering China University of Mining &Technology Xuzhou 221116 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China

Simultaneous extraction of the coal and gas is an effective method of eliminating coal mine gas disasters while safely exploiting the coal and achieving efficient gas drainage in China, which is widely accepted by the main coal-producing countries around the world. However, the concrete definition of simultaneous extraction is vague and there is little accurate theoretical support for the simultaneous extraction of coal and gas, which makes it difficult to determine an efficient gas drainage method appropriate to the features of coal seams. Based on theoretical analysis, laboratory tests and field observations, a specific definition of simultaneous extraction of coal and gas is proposed after analyzing the characteristics of coal seam occurrences in China, and we developed the mechanism of mining-enhanced permeability and established the corresponding theoretical model. This comprises a process of fracture network formation, in which the original fractures are opened and new fractures are produced by unloading damage. According to the theoretical model, the engineering approaches and their quantitative parameters of ＇unloading by borehole drilling＇ for single coal seams and ＇unloading by protective seam mining＇ for groups of coal seams are proposed, and the construction principles for coal exploitation and gas-drainage systems for different conditions are given. These methods were applied successfully in the Tunlan Coal Mine in Shanxi Province and the Panyi Coal Mine in Anhui Province and could assure safe and efficient simultaneous extraction of coal and gas in these outburst coal mines.

关键词： Coal seam gas Outburst coal seam Mining-enhanced permeability Simultaneous extraction of coal and gas

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构造煤和煤与瓦斯突出关系的研究

煤炭学报 2021年第1期46卷 180-198页

作者：程远平雷杨中国矿业大学煤矿瓦斯治理国家工程研究中心江苏徐州221116 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室江苏徐州221116 中国矿业大学安全工程学院江苏徐州221116

构造煤是原生煤经过长期的强烈挤压,剪切变形后形成的,其具有黏聚力低、强度低和渗透率低等特点。长期以来,中国乃至全球的大部分煤与瓦斯突出事故都发生在构造煤层中,但是其根本原因尚未明确。为了揭示构造煤与突出的内在关系,对构造... 详细信息

构造煤是原生煤经过长期的强烈挤压,剪切变形后形成的,其具有黏聚力低、强度低和渗透率低等特点。长期以来,中国乃至全球的大部分煤与瓦斯突出事故都发生在构造煤层中,但是其根本原因尚未明确。为了揭示构造煤与突出的内在关系,对构造煤与原生煤的孔隙结构、甲烷吸附、解吸、扩散、渗流和力学性质进行了系统性的回顾与对比,并结合突出能量进行了定量分析。结果表明,由于构造作用,构造煤比原生煤具有更大的总孔隙体积和比表面积,其中大孔受到的影响最为显著。此外,构造煤的吸附/解吸能力和扩散系数普遍较高,而抗压强度和弹性模量则普遍较小。在突出激发阶段,煤体破碎依赖于应力能的释放,此时破碎煤体释放的大量解吸瓦斯是突出后续发展的重要能量来源,特别是小于临界粒径的突出煤体,起到了决定性作用。然而,能量分析表明,若要满足临界粒径的要求,原生煤所需应力条件远高于构造煤,甚至会远超过目前采掘深度的应力水平。因此,原生煤难以提供足够的能量支撑突出的发展。在实际情况中,即使首先发生破碎的是原生煤或者岩石,突出的持续发展也强烈依赖于破碎比功更低和解吸能力更强的构造煤,表明构造煤不仅仅是更易于突出,更是突出发展的一个必要条件。此外,就构造煤的储层特性而言,在实验室中获得的构造煤渗透性能显著高于现场获得的结果(差异可达2个数量级),其主要原因可归结为实验室中重构的构造煤样品无法还原构造煤的原始物理性质。因此在未来的研究中,除了仍需要对构造煤体的孔隙结构进行系统性的研究外,还需要探究构造煤样品重构的新方法。

关键词：构造煤储层特性突出机理能量分析应力

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微孔填充——煤中甲烷的主要赋存形式

煤炭学报 2021年第9期46卷 2933-2948页

作者：程远平胡彪中国矿业大学安全工程学院江苏徐州221116 中国矿业大学煤矿瓦斯治理国家工程研究中心江苏徐州221116

煤中甲烷赋存形式是其吸附能力的表征,也是其扩散和渗透特性研究的基础,厘清煤中甲烷赋存形式对煤矿瓦斯抽采和灾害防治具有重要意义。运用低压氮气和低压二氧化碳吸附法对不同变质程度的6个煤样微观孔隙结构进行定量分析,基于微孔填充... 详细信息

煤中甲烷赋存形式是其吸附能力的表征,也是其扩散和渗透特性研究的基础,厘清煤中甲烷赋存形式对煤矿瓦斯抽采和灾害防治具有重要意义。运用低压氮气和低压二氧化碳吸附法对不同变质程度的6个煤样微观孔隙结构进行定量分析,基于微孔填充和单层吸附理论研究煤中甲烷极限吸附平衡状态,建立表征煤样甲烷吸附能力的量化方法,最后通过甲烷极限吸附实验结果验证理论结果的可靠性,获得甲烷在煤储层不同尺度孔隙结构中的赋存特征及其吸附能力的控制因素。结果表明:煤中0.38~1.50 nm孔隙结构的甲烷吸附能力受限于微孔孔容,而大于1.50 nm孔隙结构的甲烷吸附能力受孔隙表面积控制;6个煤样的孔隙结构中微孔孔容为0.028~0.065 cm^(3)/g、占66.1%~96.6%,微孔比表面积为75.4~197.3 m^(2)/g、占82.8%~98.2%;微孔填充计算的甲烷吸附量为14.50~32.27 cm^(3)/g,孔隙外表面积计算的甲烷吸附量为0.10~7.31 cm^(3)/g,计算的甲烷极限吸附量为14.60~33.35 cm^(3)/g;通过实验获得的甲烷极限吸附量为13.30~35.75 cm^(3)/g,与理论计算结果具有较好的相关性;说明煤中甲烷主要以微孔填充形式吸附在微孔孔隙中,5个煤样以微孔填充形式吸附的甲烷量超过极限吸附量的91%以上,0.38~0.76 nm微孔结构提供的甲烷吸附能力占总吸附能力的41.27%~55.32%;仅XQ煤样由于外比表面积的吸附作用,使其微孔填充形式吸附的甲烷量为极限吸附量的73.74%,0.38~0.76 nm微孔结构提供的甲烷吸附能力占总吸附能力的37.51%。

关键词：孔隙特征甲烷吸附微孔填充单层吸附

基于煤中甲烷赋存和运移特性的新孔隙分类方法

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煤炭学报 2023年第1期48卷 212-225页

作者：程远平胡彪中国矿业大学安全工程学院江苏徐州221116 西安科技大学安全科学与工程学院陕西西安710054

煤中复杂的多尺度孔隙结构是瓦斯赋存的空间和运移的通道,厘清甲烷在不同孔隙中的赋存和运移特性对煤层瓦斯的抽采利用以及灾害防治具有重要意义。在过去的几十年中,学者们对煤中复杂孔隙结构进行了大量的研究与分类。随着孔隙测试技术... 详细信息

煤中复杂的多尺度孔隙结构是瓦斯赋存的空间和运移的通道,厘清甲烷在不同孔隙中的赋存和运移特性对煤层瓦斯的抽采利用以及灾害防治具有重要意义。在过去的几十年中,学者们对煤中复杂孔隙结构进行了大量的研究与分类。随着孔隙测试技术的发展,以及对煤中甲烷赋存和运移特性的进一步认识,发现现有的煤孔隙分类方法存在不足。因此,对以往的孔隙分类方法进行全面回顾,并基于最新的煤中甲烷赋存和运移特性的研究成果,提出了一种新的针对煤和甲烷系统的孔隙分类方法。将煤中孔隙结构划分为不可达孔(100 nm)4类,且煤中不同孔隙(填充孔、扩散孔和渗流孔)形成顺序串联,相同孔隙形成相互并联为主的连接模式。煤中甲烷主要以微孔填充形式吸附于填充孔中,填充孔中的吸附态甲烷作为煤层瓦斯运移的源头,以吸附相扩散的形式为扩散孔中的游离相扩散提供源源不断的甲烷分子,而扩散孔中运移的甲烷也汇总至渗流孔并不断渗流到抽采钻孔或煤壁表面。新的煤孔隙分类方法总结了甲烷分子在不同尺寸孔隙结构中的赋存形式(微孔填充吸附态、单分子层吸附态和游离态)及其运移特性,为从微观和宏观相结合角度进一步研究甲烷在煤中的赋存和运移规律提供了理论基础。

关键词：煤甲烷微孔填充扩散渗流孔隙分类

Numerical Simulation and Its Application on Deformation and Stress Distribution of Coal Body Around Spraying Hole Induced by Waterpower

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Numerical Simulation and Its Application on Deformation and ...

煤层瓦斯解吸扩散过程中甲烷碳同位素分馏动力学模型

2012年计算机应用与系统建模国际会议

作者： Yun Baoju Liu Jianzhuang cheng yuanping College of Mining Engineering Hebei United University Faculty of Safety Engineering China University of Mining and Technology

As a widely used finite difference software in coal mine research, FLAC3D is applied with to simulate the deforming course of coal body around spraying hole induced by waterpower. The results are appealing and instructive for optimization of gas drainage holes in outburst mine. Two core simulating distribution rules on stress field and displacement field issued in this paper are both verified on site in Qinan Coal Mine of Huaibei Group. The methane drainage monitoring data indicate that spraying hole through beds induced by waterpower is beneficial to improve the drainage effect. Therefore, the paper provides technicians on gas comprehensive control with new bases and practical reference.

关键词： Outburst coal seam Hole spraying Numerical simulation engineering application

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煤炭学报 2022年第2期47卷 849-859页

作者：李伟杨康程远平中国矿业大学煤矿瓦斯治理国家工程研究中心江苏徐州221116 中国矿业大学安全工程学院江苏徐州221116

甲烷在多孔介质煤层中运移时,会发生显著的同位素分馏,目前的模型和机制并不能完全解释瓦斯运移过程中的同位素分馏现象。以不同分子间的竞争吸附作用、扩散能力差异性以及碳同位素分馏解吸-扩散成因等理论为基础,构建了煤层甲烷碳同位... 详细信息

甲烷在多孔介质煤层中运移时,会发生显著的同位素分馏,目前的模型和机制并不能完全解释瓦斯运移过程中的同位素分馏现象。以不同分子间的竞争吸附作用、扩散能力差异性以及碳同位素分馏解吸-扩散成因等理论为基础,构建了煤层甲烷碳同位素分馏动力学模型。研究结果表明,在解吸过程中,甲烷碳同位素逐渐变重。瞬时同位素值在解吸后期呈指数级变重,累计同位素值随时间的变化与气体的累计脱气量随时间的变化相似。在气体扩散过程中,扩散系数比值(D_(1)/D_(2))对同位素分馏具有显著的控制作用。煤心中吸附气的体积分数占到90%以上,吸附/解吸引起的同位素分馏变化与耦合作用下引起的同位素分馏变化相近,该模型较好的预测了煤心瓦斯解吸中碳同位素分馏试验。甲烷在孔隙中的解吸、扩散是碳同位素发生分馏的重要原因,在此过程中游离气和吸附气引起的同位素分馏具有阶段性。通过该模型的参数与煤心的参数匹配后,可以获得煤心吸附气含量、游离气含量,进而评价煤层瓦斯含量。将该模型应用到煤层钻孔瓦斯抽采过程中,结合现场测试和实验室测试确定模型参数,建立煤层钻孔抽采瓦斯碳同位素值与瓦斯抽采情况的关系。可以判断煤层瓦斯抽采所处的阶段,并计算残余瓦斯含量,为评价煤层瓦斯抽采效果的潜在应用提供理论基础。

关键词：甲烷碳同位素分馏扩散吸附/解吸动力学模型瓦斯抽采

煤与瓦斯突出预测敏感指标及其临界值研究进展

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煤炭科学技术 2021年第1期49卷 146-154页

作者：程远平周红星中国矿业大学煤矿瓦斯治理国家工程研究中心江苏徐州221116 中国矿业大学安全工程学院江苏徐州221116

煤与瓦斯突出预测是突出煤层2个"四位一体"综合防突措施的关键环节,对确定突出预测敏感指标及其临界值具有重要意义。以往突出预测敏感指标及临界值的确定,包括地应力指标和瓦斯指标,是通过现场反复测试、试验确定的;而现今的突出防治... 详细信息

煤与瓦斯突出预测是突出煤层2个"四位一体"综合防突措施的关键环节,对确定突出预测敏感指标及其临界值具有重要意义。以往突出预测敏感指标及临界值的确定,包括地应力指标和瓦斯指标,是通过现场反复测试、试验确定的;而现今的突出防治管理模式不支持这种方法,故只能采取实验室试验研究,主要是针对瓦斯相关指标的研究,结合部分现场验证来确定。选取大隆矿12煤、芦岭矿8煤、祁南矿3煤、朱仙庄矿10煤、童亭矿7煤和新景3煤等6个煤样,煤种涉及中等变质程度的气肥煤到高等变质程度的无烟煤,试验研究了各煤样瓦斯压力P与瓦斯含量W,瓦斯压力P与钻屑瓦斯解吸指标K_1和Δh_2,以及钻屑瓦斯解吸指标K_1与Δh_2之间的关系规律。结果表明:突出预测的瓦斯指标之间具有单值对应关系,但各煤样的这种对应关系是变化的,国家相关标准给出的突出预测指标建议临界值之间并不对应,也不能完全反映煤层的实际突出危险性与突出严重程度,不同变质程度煤层很难存在统一的临界值;应用煤层瓦斯相关指标之间的对应关系,结合突出煤层的实际,如始突深度、突出动力现象、钻孔动力现象等,可间接确定突出预测敏感指标的临界值。同时,未来精细化的突出防治对突出预测敏感指标有更高的要求,进一步研究的方向应包含反映地应力状况、小构造影响下煤层赋存、预测煤层潜在突出强度的指标,以及适应突出灾害差异性的新突出预测方法及措施效果检验方法。

关键词：煤与瓦斯突出突出预测敏感指标突出临界值