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Numerical simulation of adsorption process of O2/H2O mixed gas in coal porous media 煤炭多孔介质中 O2/H2O 混合气体吸附过程的数值模拟
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-25 DOI: 10.1007/s40789-024-00714-9
Huiyan Guo, Hongxiang Zhou, Chang Guo, Rongshan Nie, Xiaoyu Liang

It is of great significance for coal mining and utilization to study the adsorption process of mixed gas in coal. In this paper, the Monte Carlo method (MC) is employed to study the competitive saturation adsorption of oxygen and water vapor inside coal particles, and then the convection, diffusion and adsorption inside and between particles are studied by lattice Boltzmann method (LBM). In addition, this study examines the impacts of porosity, average particle size, and gas concentration on the process of adsorption in coal porous media. The research results show that oxygen and water vapor present in the mixed gas experience increased permeability, diffusion rate, and saturated adsorption capacity as the porosity and average particle size of the coal porous medium increase. However, the time required to achieve saturated adsorption decreases. Under the condition of maintaining the proportion of gas components and altering the initial gas concentrations from 4.087 to 53.131 mol/m3, saturated adsorption capacity of both gases remains nearly unchanged. Yet, the effective diffusivity of gases declines with increasing initial concentration. Additionally, it is also found that water vapor diffuses more quickly than oxygen in the mixed gas and achieves adsorption saturation faster.

研究煤中混合气体的吸附过程对煤炭开采和利用具有重要意义。本文采用蒙特卡洛法(Monte Carlo method,MC)研究了煤颗粒内部氧气和水蒸气的竞争饱和吸附,然后采用晶格玻尔兹曼法(Lattice Boltzmann method,LBM)研究了颗粒内部和颗粒之间的对流、扩散和吸附。此外,本研究还探讨了孔隙率、平均粒度和气体浓度对煤炭多孔介质吸附过程的影响。研究结果表明,随着煤炭多孔介质孔隙率和平均粒径的增加,混合气体中的氧气和水蒸气的渗透率、扩散速率和饱和吸附容量都会增加。然而,达到饱和吸附所需的时间却在缩短。在保持气体组分比例不变、初始气体浓度由 4.087 mol/m3 变为 53.131 mol/m3 的条件下,两种气体的饱和吸附容量几乎保持不变。然而,气体的有效扩散率随着初始浓度的增加而下降。此外,研究还发现,混合气体中水蒸气的扩散速度比氧气快,吸附饱和的速度也更快。
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引用次数: 0
Petrology and association of rare earth elements in magmatically altered high-ash coal of Indian origin 印度原产岩浆蚀变高灰份煤中稀土元素的岩石学和关联性
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-24 DOI: 10.1007/s40789-024-00709-6
Riya Banerjee, Saswati Chakladar, Alok Kumar, Shyamal Kumar Chattopadhyay, Sanchita Chakravarty

The extraction of valuables from waste has gained momentum. Thermal influence alters both the organic and inorganic components of coal. Insufficient knowledge on the association of rare earth elements (REEs) with the parent matrix of thermally altered high-ash coals (63% ash) limits the potential for such coals being utilized for isolation of valuables. In this study, we analyzed the distribution and occurrence modes of REEs within a magmatically altered high-ash coal via nine-step sequential extraction, combining Tessier and BCR methods. The total concentration of REEs in the coal sample, on whole coal basis, was found to be 820 ppm, which is significantly higher than the world average. Major mineral oxides were deduced to be those of Si, Fe, Al, Ca, Mg, and Ti. Sequential extraction confirmed that about 66% of HREE and 25% of LREE were included in the residual fraction. LREEs were concluded to be primarily in ionic form, whereas HREEs were speculated to be associated with the TiO2 phase. XRD analyses showed that thermal alteration affected the dolomite phase specifically, which selectively got removed where carbonate-bound elements were assessed. Petrographic analysis supported the magmatic influence and demonstrated the presence of mosaic structures and pores containing unfused vitrinite, with a reflectance value of 3.6. To summarize, the present study pertaining to delineation of association of valuables in high-ash heat-altered coals from an Eastern coalfield in India can potentially open up new avenues for utilizing such coals, which are otherwise considered waste.

从废料中提取有价值的物质的工作已经取得了进展。热影响会改变煤的有机和无机成分。由于对稀土元素(REEs)与热蚀变高灰分煤炭(灰分含量为 63%)母质的关联了解不足,限制了利用这类煤炭分离贵重物品的潜力。在这项研究中,我们结合泰西尔法和 BCR 法,通过九步顺序萃取法分析了岩浆蚀变高灰分煤中 REEs 的分布和出现模式。结果发现,以全煤为基准,煤样中 REEs 的总浓度为 820 ppm,明显高于世界平均水平。推断出主要矿物氧化物为硅、铁、铝、钙、镁和钛。顺序萃取证实,残余部分中含有约 66% 的 HREE 和 25% 的 LREE。据推测,LREEs 主要以离子形式存在,而 HREEs 则与 TiO2 相有关。XRD 分析表明,热蚀变特别影响了白云石相,在评估碳酸盐结合元素时,白云石相被选择性地去除。岩相分析证实了岩浆作用的影响,并表明存在镶嵌结构和孔隙,其中含有反射率值为 3.6 的未熔融矾土。总之,本研究是关于印度东部煤田高灰份热变质煤中贵重物品的关联界定,有可能为利用这些煤炭开辟新的途径,否则这些煤炭将被视为废物。
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引用次数: 0
A software for calculating coal mine gas emission quantity based on the different-source forecast method 基于不同来源预测法的煤矿瓦斯排放数量计算软件
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-21 DOI: 10.1007/s40789-024-00703-y
Wei Zhao, Huzi Dong, Junchen Ren, Yuan Yuan, Kai Wang, Fei Wang

The ability to predict gas emissions accurately is pivotal in managing gas control and ensuring safe mining operations. Existing internationally acknowledged gas control and prediction software does not cater to the specific conditions in Chinese coal mines. Hence, this paper introduces an object-oriented programming method to design a software tool for calculating the total gas emission quantity using the MATLAB application program designer runtime environment. The software incorporates an algorithm, data structure, framework, and module functions, all of which enable seamless integration and visualization of gas emission calculation software. This software tool mitigates the inefficiencies and inaccuracies associated with manual, different-source forecast methods. Based on the field data of the Hulonggou Coal Mine in Shanxi province, this technical software was used to predict the gas emission of the mine. The research results show that the predicted value of the technical software is close to the actual measured value. The differing estimates of the working face and coal mine output primarily account for the deviation between the tool's predicted gas emission value and the field-measured value. The underlying design logic of this technical software determines that it has good adaptability to mines with clear mining technology parameters and gas geological parameters. This study provides a valuable method for researchers and engineers seeking to improve gas emission calculation efficiency.

准确预测瓦斯排放的能力对于瓦斯控制管理和确保采矿作业安全至关重要。现有的国际公认的瓦斯控制和预测软件并不适合中国煤矿的具体情况。因此,本文介绍了一种面向对象的编程方法,利用 MATLAB 应用程序设计器运行环境设计了一种计算瓦斯排放总量的软件工具。该软件集算法、数据结构、框架和模块功能于一体,实现了瓦斯排放计算软件的无缝集成和可视化。该软件工具减少了人工、不同来源预测方法的低效率和不准确性。基于山西省葫芦沟煤矿的现场数据,该技术软件被用于预测该煤矿的瓦斯排放。研究结果表明,技术软件的预测值接近实际测量值。该工具预测的瓦斯排放值与现场测量值之间的偏差主要是由于对工作面和煤矿产量的估计不同造成的。该技术软件的基本设计逻辑决定了它对具有明确开采技术参数和瓦斯地质参数的矿井具有良好的适应性。这项研究为寻求提高瓦斯排放计算效率的研究人员和工程师提供了一种有价值的方法。
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引用次数: 0
A review of coal permeability models including the internal swelling coefficient of matrix 包括基质内部膨胀系数在内的煤炭渗透性模型综述
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-20 DOI: 10.1007/s40789-024-00701-0
Shouqing Lu, Jiang Shi, Lei Jiao, Yankun Ma, Wei Li, Zhanyou Sa, Jie Liu, Taibiao Bei, Shengcheng Wang

Coal bed methane (CBM), the high-quality and efficient fuel, has caught the interest of many nations as they strive for environmentally friendly development. Therefore, the efficient exploitation and utilization of CBM has become one of the international focal research problems. A significant factor affecting the mining of CBM is coal permeability. To better capture the changes that occur during the extraction of CBM, the internal swelling coefficient of matrix (ISCM) has been gradually in permeability introduced into the permeability models, and such models have become an important type of the development of permeability models. The goal is to find out more precisely the evolution mechanism of the ISCM and its influence on the permeability models. In this paper, the selection of coal structure, determination of boundary conditions and influencing factors of permeability for were first analyzed. Then, according to the research process of ISCM, the permeability models including the ISCM were reviewed and divided into four phases: proposal phase, development phase, evaluation phase and display of internal structure phase. On the basis of the ISCM values in the current coal permeability models, the primary influencing factors and evolutionary laws of the ISCM are explored. The results obtained provide guidance for future theoretical refinement of permeability models with the ISCM.

煤层气(CBM)作为一种优质高效的燃料,在许多国家努力实现环境友好型发展的过程中引起了他们的兴趣。因此,煤层气的高效开采和利用已成为国际焦点研究问题之一。影响煤层气开采的一个重要因素是煤的渗透性。为了更好地捕捉煤层气开采过程中发生的变化,基质内膨胀系数(ISCM)已逐渐在渗透率模型中引入,这类模型已成为渗透率模型发展的重要类型。我们的目标是更精确地探明 ISCM 的演化机理及其对渗透率模型的影响。本文首先分析了煤层结构的选择、边界条件的确定以及渗透率的影响因素。然后,根据 ISCM 的研究过程,对包括 ISCM 在内的透气性模型进行了梳理,并将其划分为四个阶段:提出阶段、开发阶段、评价阶段和内部结构展示阶段。在现有煤炭透气性模型中 ISCM 数值的基础上,探讨了 ISCM 的主要影响因素和演化规律。研究结果为今后利用 ISCM 对透气性模型进行理论完善提供了指导。
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引用次数: 0
The release and migration mechanism of arsenic during pyrolysis process of Chinese coals 中国煤炭热解过程中砷的释放和迁移机制
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-19 DOI: 10.1007/s40789-024-00715-8
Meijie Sun, Lingmei Zhou, Jiali Zhong, Yingjie Zhao, Hao Zheng, Beibei Qu, Maolin Ma

Special attention was drawn to the heavy metals contained in coal, due to it will cause harm to the environment during coal processing and utilization. The sequential chemical extraction of Shanxi coal (SX coal) and Wulanchabu coal (WLCB coal) was carried out to investigate the distribution of arsenic (As) in coals. Two raw coals were pyrolyzed at 300–900 °C in horizontal tubular furnace to investigate release behavior of As during pyrolysis process. The results showed that As in SX coal mainly existed in aluminosilicate-bound state (40.25%) and disulfide-bound state (32.51%), followed by carbonate-bound state and organic-bound state. The As in WLCB coal mainly existed in aluminosilicate-bound state (62.50%), followed by disulfide-bound state (19.10%). The As contents of water-soluble, ion-exchange and residue states in the two coals were less than others. The modes of occurrence of As had great influence on its volatilization behavior. As in organic part was easy to volatilize at low temperature. Sulfide-bound state would escape with the decomposition of pyrite. Because SX coal contained higher organic state and sulfide-bound state, the volatilization rate of As was higher than WLCB coal at any temperature, and the difference was more obvious at low temperature. In addition, FactSage simulation value was basically consistent with the experimental value.

由于煤炭在加工和利用过程中会对环境造成危害,因此煤炭中含有的重金属引起了人们的特别关注。研究人员对山西煤(SX 煤)和乌兰察布煤(WLCB 煤)进行了连续化学萃取,以调查煤中砷(As)的分布情况。在水平管式炉中,两种原煤在 300-900 °C 的温度下进行热解,以研究热解过程中砷的释放行为。结果表明,SX 煤中的砷主要以铝硅酸盐结合态(40.25%)和二硫化物结合态(32.51%)存在,其次是碳酸盐结合态和有机结合态。WLCB煤中的As主要以铝硅酸盐结合态存在(62.50%),其次是二硫化物结合态(19.10%)。两种煤中水溶态、离子交换态和残留态的 As 含量均较低。砷的存在方式对其挥发行为有很大影响。有机态的 As 在低温下容易挥发。硫化物结合态会随着黄铁矿的分解而逸出。由于 SX 煤含有较高的有机态和硫化物结合态,因此在任何温度下,As 的挥发率都高于 WLCB 煤,在低温下差异更为明显。此外,FactSage 模拟值与实验值基本一致。
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引用次数: 0
Geochemistry of Cenozoic coals from Sarawak Basin, Malaysia: implications for paleoclimate, depositional conditions, and controls on petroleum potential 马来西亚沙捞越盆地新生代煤炭的地球化学:对古气候、沉积条件和石油潜力控制的影响
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-06-04 DOI: 10.1007/s40789-024-00690-0
Lanre Asiwaju, Khairul Azlan Mustapha, Wan Hasiah Abdullah, Say Gee Sia, Mohammed Hail Hakimi

Forty Tertiary coals from Mukah-Balingian and Merit-Pila coalfields of the Sarawak Basin, Malaysia were investigated using bulk and molecular geochemical techniques such as proximate analysis, gas chromatography-mass spectrometry, elemental analyser, isotope ratio mass spectrometry, and inductively coupled plasma mass spectrometry to reconstruct their paleovegetation, paleoclimate, and environments of deposition. In addition, principal component analysis (PCA) of selected geochemical parameters was carried out to determine the controlling influences on the petroleum potential of the humic coals. δ13C values and the abundance of terpenoids imply the predominant contribution of angiosperms to the paleoflora. Bimetal proxies (Sr/Ba, Sr/Cu, and C-value), and δD values are generally suggestive of a warm and humid climate during the accumulation of the paleopeats. However, n-alkane proxies (Pwax, Paq, n-C23/n-C29, etc.) and polycyclic aromatic hydrocarbons (PAHs) distribution suggest that Balingian coals accumulated under relatively drier and strongly seasonal paleoclimate in the Late Pliocene. When compared with published global average abundances, the investigated coals are mostly depleted in major oxides and trace elements, suggesting peat accumulation in freshwater-influenced environments. Nonetheless, higher (> 0.5 wt%) total sulfur content in some Mukah-Balingian coals suggests some degree of epigenetic marine influence. Furthermore, the low to moderately-high ash contents of the Sarawak Basin coals indicate the presence of ombrotrophic and rheotrophic peat deposits. PCA result of selected geochemical proxies suggests that source input, paleoflora, and marine incursions are not major controlling influences on the petroleum potential. However, climatic, and depositional conditions appear to slightly influence the petroleum potential of the studied humic coals.

研究采用了大量和分子地球化学技术,如近似分析、气相色谱-质谱法、元素分析仪、同位素比质谱法和电感耦合等离子体质谱法,对来自马来西亚沙捞越盆地 Mukah-Balingian 和 Merit-Pila 煤田的 40 块第三纪煤炭进行了调查,以重建它们的古植被、古气候和沉积环境。此外,还对选定的地球化学参数进行了主成分分析(PCA),以确定对腐殖质煤的石油潜力具有控制性影响的因素。δ13C值和丰富的萜类化合物意味着被子植物在古植物群落中占主导地位。双金属代用指标(Sr/Ba、Sr/Cu 和 C 值)和 δD 值总体上表明古地层堆积期间气候温暖湿润。然而,正烷烃代用指标(Pwax、Paq、n-C23/n-C29 等)和多环芳烃(PAHs)的分布表明,巴陵煤炭是在晚上新世相对干燥和季节性较强的古气候条件下堆积的。与已公布的全球平均丰度相比,所调查的煤炭大多缺乏主要氧化物和微量元素,这表明泥炭是在淡水影响的环境中积累的。尽管如此,一些穆卡-巴林煤炭中较高的(0.5 wt%)总硫含量表明在一定程度上受到了海洋的影响。此外,沙捞越盆地煤炭的灰分含量从低到中等偏高,这表明这里存在腐生和流变泥炭沉积。所选地球化学代用指标的 PCA 结果表明,源输入、古植物群落和海洋入侵对石油潜力的影响不大。不过,气候和沉积条件似乎对所研究腐殖质煤炭的石油潜力略有影响。
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引用次数: 0
Failure characteristics and fracture mechanism of overburden rock induced by mining: A case study in China 采矿诱发覆盖层岩石的破坏特征与断裂机理:中国案例研究
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-05-31 DOI: 10.1007/s40789-024-00693-x
Jiawei Li, Meng Zhang, Changxiang Wang, Changlong Liao, Baoliang Zhang

This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof. The caving area of the overburden rock is divided into three zones: the delamination fracture zone, broken fracture zone, and compaction zone. The caving and fracture zones' heights are approximately 110 m above the coal seam, with a maximum subsidence of 11 m. The delamination fracture zone's porosity range is between 0.2 and 0.3, while the remainder of the roof predominantly exhibits a porosity of less than 0.1. In addition, the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an 'arch-beam' structure starting from 160 m, with the maximum and minimum stress values decreasing as the distance of advancement increases. In the stress beam interval of the overburden rock, the maximum value changes periodically as the advancement distance increases. Based on a comparative analysis between observable data from on-site work and numerical simulation results, the stress data from the numerical simulation are essentially consistent with the actual results detected on-site, indicating the validity of the numerical simulation results.

本研究采用类似模拟试验和离散元模拟耦合的方法,分析了模型煤层顶板的破坏和变形过程。覆盖层岩石的塌陷区分为三个区域:分层断裂带、破碎断裂带和压实带。分层断裂带的孔隙率范围在 0.2 至 0.3 之间,而顶板其余部分的孔隙率主要小于 0.1。此外,数值模型的应力分析表明,从 160 米开始,覆岩的位移带形成了 "拱梁 "结构,最大和最小应力值随着推进距离的增加而减小。在覆岩的应力梁区间,随着推进距离的增加,最大应力值呈周期性变化。根据现场观测数据与数值模拟结果的对比分析,数值模拟的应力数据与现场检测的实际结果基本一致,说明数值模拟结果是正确的。
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引用次数: 0
Screening the optimal Cox/CeO2(110) (x = 1–6) catalyst for methane activation in coalbed gas 筛选煤层气中甲烷活化的最佳 Cox/CeO2(110)(x = 1-6)催化剂
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-05-31 DOI: 10.1007/s40789-024-00697-7
Li’nan Huang, Danyang Li, Lei Jiang, Zhiqiang Li, Dong Tian, Kongzhai Li

The challenges posed by energy and environmental issues have forced mankind to explore and utilize unconventional energy sources. It is imperative to convert the abundant coalbed gas (CBG) into high value-added products, i.e., selective and efficient conversion of methane from CBG. Methane activation, known as the “holy grail”, poses a challenge to the design and development of catalysts. The structural complexity of the active metal on the carrier is of particular concern. In this work, we have studied the nucleation growth of small Co clusters (up to Co6) on the surface of CeO2(110) using density functional theory, from which a stable loaded Co/CeO2(110) structure was selected to investigate the methane activation mechanism. Despite the relatively small size of the selected Co clusters, the obtained Cox/CeO2(110) exhibits interesting properties. The optimized Co5/CeO2(110) structure was selected as the optimal structure to study the activation mechanism of methane due to its competitive electronic structure, adsorption energy and binding energy. The energy barriers for the stepwise dissociation of methane to form CH3*, CH2*, CH*, and C* radical fragments are 0.44, 0.55, 0.31, and 1.20 eV, respectively, indicating that CH* dissociative dehydrogenation is the rate-determining step for the system under investigation here. This fundamental study of metal-support interactions based on Co growth on the CeO2(110) surface contributes to the understanding of the essence of Co/CeO2 catalysts with promising catalytic behavior. It provides theoretical guidance for better designing the optimal Co/CeO2 catalyst for tailored catalytic reactions.

能源和环境问题带来的挑战迫使人类探索和利用非常规能源。当务之急是将丰富的煤层气(CBG)转化为高附加值产品,即从煤层气中选择性地高效转化甲烷。被称为 "圣杯 "的甲烷活化对催化剂的设计和开发提出了挑战。载体上活性金属的结构复杂性尤其令人担忧。在这项工作中,我们利用密度泛函理论研究了 CeO2(110) 表面小 Co 簇(最多为 Co6)的成核生长,并从中选择了一种稳定的负载 Co/CeO2(110) 结构来研究甲烷活化机理。尽管所选 Co 簇的尺寸相对较小,但得到的 Cox/CeO2(110) 表现出了有趣的特性。由于具有竞争性的电子结构、吸附能和结合能,优化的 Co5/CeO2(110) 结构被选为研究甲烷活化机理的最佳结构。甲烷逐步解离形成 CH3*、CH2*、CH* 和 C* 自由基片段的能垒分别为 0.44、0.55、0.31 和 1.20 eV,表明 CH* 解离脱氢是本文所研究体系的速率决定步骤。这项基于 CeO2(110) 表面 Co 生长的金属-支撑相互作用的基础研究有助于理解具有良好催化行为的 Co/CeO2 催化剂的本质。它为更好地设计用于定制催化反应的最佳 Co/CeO2 催化剂提供了理论指导。
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引用次数: 0
Comparative study on different coals from the Lorraine basin (France) by sorption isotherms, thermogravimetric analysis and breakthrough curves for CO2-ECBM recovery 通过吸附等温线、热重分析和突破曲线对洛林盆地(法国)的不同煤炭进行比较研究,以促进二氧化碳-碳-碳-木质素(CO2-EBM)回收
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-05-31 DOI: 10.1007/s40789-024-00696-8
Franck Amoih, Gisèle Finqueneisel, Thierry Zimny, Sandrine Bourrelly, Odile Barres, Dragan Grgic

The enhanced coalbed methane recovery using CO2 injection (CO2-ECBM) is widely proposed as a way of achieving the energy transition and reducing atmospheric CO2 in areas such as the Lorrain basin in France, where heavy industry is responsible for huge CO2 emissions and coal mines have been closed for more than a decade. This paper deals with the feasibility of extracting methane from the Lorraine basin using CO2-ECBM by comparing data from sorption isotherms, thermogravimetric analyses and breakthrough curves for two coal samples. One is bituminous (Box 18), from Folschviller (France) and is compared with another sub-bituminous (TH01) from La Houve (France), which is used as a reference because it was identified as a good candidate for CO2-ECBM in a previous research program. The quantities of adsorbed gases (CO2/CH4) obtained by sorption isotherms, thermogravimetry and CO2 breakthrough curves showed that Box 18 adsorbs more CO2 and CH4 than TH01 due to its higher porosity and good affinity for gases (CO2/CH4). Tόth model fits the experimental CH4 and CO2 adsorption isotherms better, reflecting the fact that the adsorption surface of the coals studied is heterogeneous. Adsorption enthalpies obtained by calorimetry indicated physisorption for gas-coal interactions, with higher values for CO2 than for CH4. Thermogravimetric analyses and breakthrough curves carried out at up to 50% relative humidity showed that the adsorption capacity of CO2 decreases with increasing temperature and the presence of water, respectively. The compilation of these experimental data explained the adsorption process of the studied coals and revealed their advantages for CO2-ECBM.

在法国洛林盆地等重工业排放大量二氧化碳且煤矿已关闭十多年的地区,利用二氧化碳注入强化煤层甲烷回收(CO2-ECBM)被广泛认为是实现能源转型和减少大气中二氧化碳的一种方法。本文通过比较两种煤炭样本的吸附等温线、热重分析和突破曲线数据,探讨了利用 CO2-ECBM 从洛林盆地提取甲烷的可行性。其中一个是来自法国 Folschviller 的烟煤(方框 18),与另一个来自法国 La Houve 的亚烟煤(TH01)进行了比较。通过吸附等温线、热重仪和二氧化碳突破曲线获得的气体(CO2/CH4)吸附量表明,Box 18 比 TH01 吸附更多的 CO2 和 CH4,因为它的孔隙率更高,对气体(CO2/CH4)的亲和力更好。Tόth模型更适合实验中的CH4和CO2吸附等温线,反映了所研究煤炭的吸附表面是异质的这一事实。通过量热法获得的吸附焓表明气体与煤之间存在物理吸附作用,二氧化碳的吸附焓值高于 CH4。在相对湿度高达 50%的条件下进行的热重分析和突破曲线显示,二氧化碳的吸附能力分别随着温度的升高和水的存在而降低。这些实验数据的汇编解释了所研究煤炭的吸附过程,并揭示了它们在 CO2-ECBM 方面的优势。
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引用次数: 0
Effect mechanism of seepage force on the hydraulic fracture propagation 渗流力对水力压裂扩展的影响机制
IF 8.3 1区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-05-30 DOI: 10.1007/s40789-024-00695-9
Haiyang Wang, Desheng Zhou, Yi Zou, Peng Zheng

The flow of fluid through the porous matrix of a reservoir rock applies a seepage force to the solid rock matrix. Although the seepage force exerted by fluid flow through the porous matrix of a reservoir rock has a notable influence on rock deformation and failure, its effect on hydraulic fracture (HF) propagation remains ambiguous. Therefore, in this study, we improved a traditional fluid–solid coupling method by incorporating the role of seepage force during the fracturing fluid seepage, using the discrete element method. First, we validated the simulation results of the improved method by comparing them with an analytical solution of the seepage force and published experimental results. Next, we conducted numerical simulations in both homogeneous and heterogeneous sandstone formations to investigate the influence of seepage force on HF propagation. Our results indicate that fluid viscosity has a greater impact on the magnitude and extent of seepage force compared to injection rate, and that lower viscosity and injection rate correspond to shorter hydraulic fracture lengths. Furthermore, seepage force influences the direction of HF propagation, causing HFs to deflect towards the side of the reservoir with weaker cementation and higher permeability.

流体流经储层岩石的多孔基质时,会对固体岩石基质产生渗流力。虽然流体流经储层岩石多孔基质时产生的渗流力对岩石变形和破坏有显著影响,但其对水力裂缝(HF)扩展的影响仍不明确。因此,在本研究中,我们采用离散元方法改进了传统的流固耦合方法,加入了压裂液渗流过程中渗流力的作用。首先,我们将改进方法的模拟结果与渗流力的解析解和已公布的实验结果进行了比较,从而验证了改进方法的模拟结果。接着,我们在均质和异质砂岩地层中进行了数值模拟,以研究渗流力对高频传播的影响。结果表明,与注入率相比,流体粘度对渗流力的大小和范围影响更大,粘度和注入率越低,水力裂缝长度越短。此外,渗流力还会影响高频的传播方向,导致高频向储层中胶结较弱、渗透率较高的一侧偏移。
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International Journal of Coal Science & Technology
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