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学者姓名：洪溢都
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微波辐射诱发的热效应与非热效应均会对煤岩产生一系列的影响,微波感应放电属于微波非热效应中的一种现象.煤作为一种非均质性强的多孔、富矿的骨架结构,内部的孔隙、矿物等均会对电场产生影响,不同组分颗粒间的微波放电现象及电场强化特性具有较大差别;而目前相关研究主要围绕在煤体中的煤基质上,忽略了煤体中的矿物及矿物本身形状不规则性带来的影响,导致对真实矿物颗粒间的放电机制以及影响其放电强度的因素仍不清楚.因此,通过绘图软件将电子计算机X射线断层扫描机(XCT)扫描获得的真实煤岩颗粒形状描绘出来,利用COMSOL Multiphyics软件模拟了微波场下真实煤岩颗粒的电场强化特性,并探讨了其产生的原因.结果表明:微波的传播方式及极化特性对颗粒间电场强化有显著影响,颗粒间电场强度在x传播y极化时最大;相对于其他5种颗粒组合,粒径和间距对黄铁矿-黄铁矿组合的电场强化效果最明显,煤岩颗粒组合电场强化的最佳效果出现在大粒径、无间距的情况下;颗粒间夹角的变化对电场强化效果有一定的影响,且各颗粒形状对应的电场强化最大值均出现在夹角为0°时;规则矿石颗粒(圆、正方形、五边形等)的电场强化效果与颗粒圆度系数直接相关,颗粒间电场强度最大值出现在颗粒尖端角度为60°左右、圆度系数为0.71的正三角形时;而不规则矿石颗粒的电场强度与圆度系数、分形维数并无关系,且随曲率的增大而逐渐增大;此外,碳质材料的石墨化程度会对电场强化效应产生较大的影响,电场强度随着石墨化程度增加而增加.
Keyword ：
不规则煤岩 不规则煤岩 微波 微波 散射 散射 数值模拟 数值模拟 电场强化 电场强化
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| GB/T 7714 | 孙晓婉 , 洪溢都 , 龙盛壹 et al. 微波激励下煤岩颗粒间电场强化特性研究 [J]. | 煤炭学报 , 2025 , 50 (3) : 1597-1608 . |
| MLA | 孙晓婉 et al. "微波激励下煤岩颗粒间电场强化特性研究" . | 煤炭学报 50 . 3 (2025) : 1597-1608 . |
| APA | 孙晓婉 , 洪溢都 , 龙盛壹 , 李贺 , 刘猛 , 阳富强 . 微波激励下煤岩颗粒间电场强化特性研究 . | 煤炭学报 , 2025 , 50 (3) , 1597-1608 . |
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Microwave radiation can produce various thermal and non-thermal effects on coal particles. Microwave-induced plasma is one of the phenomena of microwave non-thermal effects. However, the microwave-induced plasma mechanism of coal particles is still unclear in previous studies. Moreover, the effect of mineral composition in coal and the irregularity of mineral shape on microwave-induced plasma has been ignored. The effect of mineral components, particle size, spacing, particle angle, particle shape and graphitization degree on microwave induced plasma was studied. It was found that different components of coal particles have significant variations in the intensity of microwave discharge due to their own dielectric properties. The electron density of the coal matrix combination weaker than that of the pyrite combination by 1 similar to 2 orders of magnitude. When other particles are combined with pyrite particles, the plasma distribution is lopsided and biased to pyrite particles. As the particle size increases, the time required to reach the maximum electron density decreases, making the discharge process easier. When the particle spacing is smaller than 20 mu m, plasma is generated at both ends of the particles. However, as the spacing increases, plasma is generated between the particles, resulting in a decrease in electron density. Moreover, the electric field between the particles gradually weakens with the angle increasing. The microwave discharge is weakest when the angle increases to 90 degrees. The electric field strengthening effect of irregular coal particles is directly related to the value of particle curvature. In addition, the carbonaceous materials with high graphitization degree can promote more significant discharge effect.
Keyword ：
Coal Coal Microwave discharge Microwave discharge Plasma Plasma Pyrite Pyrite
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| GB/T 7714 | Sun, Xiaowan , Long, Shengyi , Hong, Yidu et al. Microwave induced plasma of coal particles by numerical simulation [J]. | FUEL , 2025 , 384 . |
| MLA | Sun, Xiaowan et al. "Microwave induced plasma of coal particles by numerical simulation" . | FUEL 384 (2025) . |
| APA | Sun, Xiaowan , Long, Shengyi , Hong, Yidu , Hong, Biqiong , Li, He , Liu, Meng et al. Microwave induced plasma of coal particles by numerical simulation . | FUEL , 2025 , 384 . |
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The spontaneous combustion of sulfide ore piles poses a significant threat to miners' health and mining safety. In this work, numerical simulations of the temperature, velocity, and concentration field during the self-heating of sulfide ore piles were conducted using COMSOL Multiphysics. A self-heating model was established based on porous media fluid dynamics and heat transfer theory. The simulation parameters were determined, and the numerical solution of the heat conduction equation for sulfide ores was obtained. The results indicate a three-stage temperature progression: slow oxidation (0–10 days, with temperatures below 335 K), rapid heating (10–16 days, with a peak temperature of 926 K), and gradual cooling (16–24 days). The stacking method significantly influences the self-heating temperature field. Larger cross-sectional areas, stack heights, and stack angles of ore piles lead to higher temperatures and shorter safe stacking times. Furthermore, the lower the porosity and the slower the ambient wind velocity, the greater the risk of spontaneous combustion in a stockpile due to heat accumulation. This work can provide a predictive framework for optimizing ore pile geometry and ventilation strategies, offering practical insights to mitigate spontaneous combustion risks in mining operations. © 2025 The Institution of Chemical Engineers
Keyword ：
Electric heating Electric heating Heat conduction Heat conduction Industrial heating Industrial heating Mine rescue Mine rescue Mine safety Mine safety
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| GB/T 7714 | Liu, Weidong , Huang, Yujie , Yin, Hang et al. Multi-physics modelling and simulation on the spontaneous heating of sulfide ores [J]. | Process Safety and Environmental Protection , 2025 , 199 . |
| MLA | Liu, Weidong et al. "Multi-physics modelling and simulation on the spontaneous heating of sulfide ores" . | Process Safety and Environmental Protection 199 (2025) . |
| APA | Liu, Weidong , Huang, Yujie , Yin, Hang , Yang, Fuqiang , Hong, Yidu . Multi-physics modelling and simulation on the spontaneous heating of sulfide ores . | Process Safety and Environmental Protection , 2025 , 199 . |
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N-methylpyrrolidone (NMP) solvent has been a popular chemical reagent in coalbed stimulation in recent years. To explore the effects of different concentrations of NMP solvent on the pore development of coal, the physical characteristics of porosity, pore size distribution, T1-T2 spectrum and permeability of coal were obtained based on nuclear magnetic resonance (NMR) test. The changes in porosity, fracture structure and coal seam permeability of coal under different concentrations of NMP solvent were analyzed. The results showed that, on the whole, the pore range of coal samples treated with different concentrations of NMP increased correspondingly with the increase in the number of treatments. The concentration of 100 % NMP solvent had the greatest effect on the pore development degree of coal, which significantly expanded the pore space of coal and enhanced the connectivity of coal. Pore throat less than 0.1 mu m increased from 35.52 % to 39.14 %, an increase of 3.62 %. Pore throat greater than 0.1 mu m increased from 5.74 % to 12.48 %, an increase of 6.74 %. Permeability, free fluid saturation and porosity increased by 261 %, 11.4 % and 22 %, respectively. This study can provide data support and theoretical support for the subsequent research of related reagents, so as to select the optimal reagent concentration and reduce the economic cost. The results of this study provide a valuable reference for the selection of the optimal concentration of NMP solvent in the dredging of pores and fissures in coal seams.
Keyword ：
Coalbed methane Coalbed methane N-Methylpyrrolidone N-Methylpyrrolidone Pore structure Pore structure T1-T2 spectra T1-T2 spectra
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| GB/T 7714 | Li, He , Guo, Qingyi , Liu, Meng et al. Petrophysical characterization of coal subjected to cyclic N-methylpyrrolidone treatment based on two-dimensional NMR T1-T2 [J]. | FUEL , 2024 , 365 . |
| MLA | Li, He et al. "Petrophysical characterization of coal subjected to cyclic N-methylpyrrolidone treatment based on two-dimensional NMR T1-T2" . | FUEL 365 (2024) . |
| APA | Li, He , Guo, Qingyi , Liu, Meng , Lu, Jiexin , Hong, Yidu , Liu, Ting et al. Petrophysical characterization of coal subjected to cyclic N-methylpyrrolidone treatment based on two-dimensional NMR T1-T2 . | FUEL , 2024 , 365 . |
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To investigate the microwave heating mechanism of composite minerals, a circumferential stirring model based on the Arbitrary Lagrangian-Eulerian (ALE) method was established by COMSOL Multiphysics software. This model aims to study the temperature rise characteristics of mineral models with different component structures and proportions. The results show that the heating efficiency and uniformity of the mineral are higher in the stirred heating model with a 5 cm copper disc rotating at (π/3) rad/s compared to the non-stirred heating model; The different component structures of the composite mineral result in different electromagnetic wave distributions, which induces the microwave heating efficiency of the py-rite-enclosed calcite model is lower than the calcite-enclosed pyrite model; In the calcite-en-closed pyrite model, the variation of pyrite thickness changes the phase of electromagnetic wave, leading to the displacement of hot and cold spots in the mineral. Furthermore, when comparing the pyrite thicker and thinner than the penetration depth, there is a significant disparity in the incident electromagnetic wave intensity, resulting in noticeable differences in electric field strength; At the same component proportion, the overall electric field of heterogeneous minerals is lower and more stable, and the electric field intensity between components is closer than in composite homogeneous minerals; With the proportion of pyrite increases, the temperature variation of heterogeneous minerals after 30 s microwave heating can be divided into three regions: small peak region (0-10%), large peak region (10% - 50%), and stable region (50% - 75%), and the temperature differences between components gradually decrease. © 2024 China University of Mining and Technology. All rights reserved.
Keyword ：
Calcite Calcite Circular waveguides Circular waveguides Efficiency Efficiency Electric fields Electric fields Electromagnetic waves Electromagnetic waves Microwave heating Microwave heating Mining Mining Pyrites Pyrites
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| GB/T 7714 | Long, Shengyi , Hong, Yidu , Sun, Xiaowan et al. Microwave heating temperature rise characteristics of composite minerals under the circumferential stirring model [J]. | Journal of China University of Mining and Technology , 2024 , 53 (2) : 318-333 . |
| MLA | Long, Shengyi et al. "Microwave heating temperature rise characteristics of composite minerals under the circumferential stirring model" . | Journal of China University of Mining and Technology 53 . 2 (2024) : 318-333 . |
| APA | Long, Shengyi , Hong, Yidu , Sun, Xiaowan , Yang, Fuqiang , Guo, Jin , Nie, Wen . Microwave heating temperature rise characteristics of composite minerals under the circumferential stirring model . | Journal of China University of Mining and Technology , 2024 , 53 (2) , 318-333 . |
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Sulfide ores, collectively referred to as a class of minerals with extensive applications, are increasingly susceptible to spontaneous combustion incidents as the mining environment evolves. The spontaneous combustion of sulfide ores is a complex nonlinear process, and the mechanisms of which remain not fully understood. Consequently, it is challenging to delineate the accident trajectory through traditional accident causation models and subsequently construct a probabilistic model for spontaneous combustion risk. To address this issue, this paper proposed a risk assessment model based on grounded theory and Bayesian network. The advantage of this model is that it employs grounded theory to categorize and organize factors influencing the occurrence of accidents, thereby forming a clear accident trajectory and providing a framework and basis for constructing a probabilistic assessment model. Furthermore, the model presented in this paper introduces the D number theory and the Noisy-OR model to handle uncertainties in the risk assessment process and to establish more rational conditional probability tables. The findings suggest that environmental temperature, heat dissipation conditions, safety awareness, and safety skills are the most influential factors in spontaneous combustion incidents when considering a particular point in time. However, when considering the entire process of sulfide ore pile spontaneous combustion, the temperature of the ore pile is the most critical accident factor to monitor. Therefore, the key to suppressing the spontaneous combustion of sulfide ores lies in reducing environmental temperatures, enhancing heat dissipation, and elevating the safety awareness of relevant personnel.
Keyword ：
Bayesian network Bayesian network Grounded theory Grounded theory Risk assessment Risk assessment Spontaneous combustion Spontaneous combustion Sulfide ores Sulfide ores
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| GB/T 7714 | Zhao, Jiale , Hong, Yi-du , Yang, Fu-qiang . A risk assessment model of spontaneous combustion for sulfide ores using Bayesian network combined with grounded theory [J]. | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2024 , 192 : 680-693 . |
| MLA | Zhao, Jiale et al. "A risk assessment model of spontaneous combustion for sulfide ores using Bayesian network combined with grounded theory" . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 192 (2024) : 680-693 . |
| APA | Zhao, Jiale , Hong, Yi-du , Yang, Fu-qiang . A risk assessment model of spontaneous combustion for sulfide ores using Bayesian network combined with grounded theory . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2024 , 192 , 680-693 . |
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Heat injection provides a feasible approach for the extremely efficient extraction of coalbed gas. Injecting hot steam can effectively improve the pore structure of coal and increase the permeability of coal. To observe the changes in the pore structure of coal during hot steam injection, low magnetic field nuclear magnetic resonance technology is used to study the variations in the pore structure of coal under different heat injection durations. The results show that hot steam can promote the formation, growth, and expansion of coal pore fissures, thereby enhancing the gas permeability of the coal seam. At the same time, the analysis of relevant nuclear magnetic parameters indicates that when the heat injection duration is 15 minutes, hot steam has the best effect on coal modification. In the early stage of hot steam injection, hot steam stimulates the development of the porous structure. In the middle stage, some pore structures collapse and get blocked due to local thermal stress. In the late stage of hot steam injection, hot steam accelerates the conversion of micropore and mesopore structures into macropore or fissure structures, and hot steam has a significant modification effect on coal.
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| GB/T 7714 | Li, He , Chu, Minghao , Liu, Huihui et al. Modification of pore structure of coal under hot steam injection as revealed by nuclear magnetic resonance [J]. | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
| MLA | Li, He et al. "Modification of pore structure of coal under hot steam injection as revealed by nuclear magnetic resonance" . | PHYSICS OF FLUIDS 36 . 11 (2024) . |
| APA | Li, He , Chu, Minghao , Liu, Huihui , Hong, Yidu , Zou, Quanle , Lu, Jiexin et al. Modification of pore structure of coal under hot steam injection as revealed by nuclear magnetic resonance . | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
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Coalbed methane is a clean energy source that helps reduce greenhouse gas emissions. Its low permeability poses great challenges to low-cost mining and impacts the economic benefits of its development and utilization. High Temperature Steam-Liquid Nitrogen Cyclic Treatment (HLCT) presents a novel, environmentally benign, and efficacious technology, which promotes the iteration of pores in coal through repeated hot and cold cycles. This article used hydrogen nuclear magnetic resonance to characterize the change of coal after HLCT at the microscopic level. The evolution trend of internal pores was analyzed based on the T-2 spectrum, and the T-1-T-2 spectrum was plotted to show the distribution of fluids. Nuclear magnetic characteristic parameter variation was examined, and the trends of D-s and D-e before and after cyclic processing were explored. The results indicate that as the cycle progresses, the number of pores at different scales in the coal increases, the free fluid storage space expands, Specifically, after 15 cycles, permeability improved by 1621.72%, and porosity increased to 29.05%. The D-s of coal decreases with cycles while D-e is the opposite. This study highlights the potential of HLCT in coalbed methane extraction while providing valuable insights for optimizing coal resource utilization in alignment with clean energy goals.
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| GB/T 7714 | Li, He , Liao, Jiajun , Liu, Rui et al. Coupling effect of high temperature steam-liquid nitrogen cyclic treatment on pore iteration and fluid flow behavior in bituminous coal [J]. | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
| MLA | Li, He et al. "Coupling effect of high temperature steam-liquid nitrogen cyclic treatment on pore iteration and fluid flow behavior in bituminous coal" . | PHYSICS OF FLUIDS 36 . 11 (2024) . |
| APA | Li, He , Liao, Jiajun , Liu, Rui , Hong, Yidu , Lu, Jiexin , Cao, Jieyan . Coupling effect of high temperature steam-liquid nitrogen cyclic treatment on pore iteration and fluid flow behavior in bituminous coal . | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
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Microwave irradiation has become a potential technical method for coalbed degassing, which can effectively improve its permeability. A coupled electromagnetic-thermomechanical damage (ETMD) model was established to study the damage characteristics of coal containing pyrites. Under microwave irradiation, the temperature increase rate of pyrite was significantly higher compared to the coal matrix. The coal matrix was cracked by expansion stress in high-temperature spots. In the rotational heating mode, the coal matrix was easier to damage than under the static heating mode. The coal matrix damage efficiency was also related to the position of the sample under the static heating mode. Uniform centripetal pressure could inhibit coal matrix damage. Moreover, the pressure distribution affected the damage paths. Compared to no confining pressure, the percentage of areas damaged in coal was lower under low parallel pressure and higher under high parallel pressure.
Keyword ：
coalbed degassing coalbed degassing crack crack microwave energy microwave energy numerical simulation numerical simulation
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| GB/T 7714 | Hong, Yidu , Long, Shengyi , Sun, Xiaowan . Numerical Simulation of Microwave-Induced Cracking of Coal Containing Pyrite Powder Based on a Multi-Field Coupling Model [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
| MLA | Hong, Yidu et al. "Numerical Simulation of Microwave-Induced Cracking of Coal Containing Pyrite Powder Based on a Multi-Field Coupling Model" . | APPLIED SCIENCES-BASEL 14 . 24 (2024) . |
| APA | Hong, Yidu , Long, Shengyi , Sun, Xiaowan . Numerical Simulation of Microwave-Induced Cracking of Coal Containing Pyrite Powder Based on a Multi-Field Coupling Model . | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
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To improve the efficiency of coalbed methane and recoverability of reservoirs, enhanced fracturing technology is usually required to improve the low porosity and permeability status of coal reservoirs. As a feasible method for strengthening permeability, microwave-LN2 freeze-thaw (MLFT) cycles modify the microscopic pore structure of coal through the coupled effect of temperature stress changes, phase change expansion, and fatigue damage. 1H nuclear magnetic resonance combined with fractal dimension theory was used to characterize quantitatively the pore system and geometric features of coal. The geometric fractal model constructed using the T-2 spectrum indicates that the fractal dimensions Dp and De have high fitting accuracy, demonstrating that percolation and effective pores exhibit good fractal characteristics. Dp and De are correlated negatively and positively, respectively, with the cyclic parameters. The relevance analysis shows that the NMR fractal method can reflect the pore-fracture heterogeneity of coal, which has a significant effect on the percentage of fluid migration space. This study reveals that MLFT cycles have significant enhancement effects on promoting the extension of multi-type pores structures within the coal matrix, as well as the connectivity and permeability of cracks.
Keyword ：
Coalbed methane Coalbed methane Liquid nitrogen Liquid nitrogen Microwave Microwave Nuclear magnetic resonance Nuclear magnetic resonance Pore structure Pore structure
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| GB/T 7714 | Li, He , Wu, Xi , Liu, Meng et al. Modification of Microstructural and Fluid Migration of Bituminous Coal by Microwave-LN2 Freeze-Thaw Cycles: Implication for Efficient Recovery of Coalbed Methane [J]. | NATURAL RESOURCES RESEARCH , 2024 , 33 (5) : 2173-2191 . |
| MLA | Li, He et al. "Modification of Microstructural and Fluid Migration of Bituminous Coal by Microwave-LN2 Freeze-Thaw Cycles: Implication for Efficient Recovery of Coalbed Methane" . | NATURAL RESOURCES RESEARCH 33 . 5 (2024) : 2173-2191 . |
| APA | Li, He , Wu, Xi , Liu, Meng , Lin, Baiquan , Yang, Wei , Hong, Yidu et al. Modification of Microstructural and Fluid Migration of Bituminous Coal by Microwave-LN2 Freeze-Thaw Cycles: Implication for Efficient Recovery of Coalbed Methane . | NATURAL RESOURCES RESEARCH , 2024 , 33 (5) , 2173-2191 . |
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