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Macroscopic and microscopic mechanical behavior and seepage characteristics of coal under hydro-mechanical coupling

Journal of Central South University 2024年第8期31卷 2765-2779页

作者： Gao, Ming-zhong Gao, Zheng Yang, Ben-gao Xie, Jing Wang, Ming-yao Hao, Hai-chun Wu, Yan Zhou, Lang Wang, Jing-yu state key laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Civil and Transportation Engineering Shenzhen University Shenzhen China state key laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Water Resource & Hydropower Sichuan University Chengdu China state key laboratory of coal mining and Clean utilization Beijing China China Railway Engineering Equipment Group Co. Ltd. Zhengzhou China Northwest Engineering Corporation Limited Xi’an China

Understanding the physical, mechanical behavior, and seepage characteristics of coal under hydro-mechanical coupling holds significant importance for ensuring the stability of surrounding rock formations and preventing gas outbursts. Scanning electron microscopy, uniaxial tests, and triaxial tests were conducted to comprehensively analyze the macroscopic and microscopic physical and mechanical characteristics of coal under different soaking times. Moreover, by restoring the stress path and water injection conditions of the protective layer indoors, we explored the coal mining dynamic behavior and the evolution of permeability. The results show that water causes the micro-surface of coal to peel off and cracks to expand and develop. With the increase of soaking time, the uniaxial and triaxial strengths were gradually decreased with nonlinear trend, and decreased by 63.31% and 30.95% after soaking for 240 h, respectively. Under different water injection pressure conditions, coal permeability undergoes three stages during the mining loading process and ultimately increases to higher values. The peak stress of coal, the deviatoric stress and strain at the permeability surge point all decrease with increasing water injection pressure. The results of this research can help improve the understanding of the coal mechanical properties and seepage evolution law under hydro-mechanical coupling.

关键词： coal water intrusion mechanical properties permeability macro and micro features

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Thermogravimetric characteristics of corn straw and bituminous coal copyrolysis based the ilmenite oxygen carriers

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Chinese Journal of Chemical Engineering 2024年第4期68卷 8-15页

作者： Pengxing Yuan Xiude Hu Jingjing Ma Tuo Guo Qingjie Guo College of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China state key laboratory of High-efficiency utilization of coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Herein,the co-pyrolysis reaction characteristics of corn straw(CS)and bituminous coal in the presence of ilmenite oxygen carriers(OCs)are investigated via thermogravimetry coupled with mass *** results reveal that the participation of OCs weakens the devolatilization intensity of *** the CS blending ratio is<50%,the mixed fuel exhibits positive synergistic *** fitting results according to the Coats-Redfern integral method show that the solid-solid interaction between OCs and coke changes the reaction kinetics,enhancing the co-pyrolysis reactivity at the high-temperature zone(750-950C).The synergistic effect is most prominent at a 30%CS blending ratio,with copyrolysis activation energy in the range of 26.35-40.57 kJ·mol^(-1).

关键词： Oxygen carrier Co-pyrolysis Biomass coal

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Electrostatic removal of ultrafine carbon black with square-grooved collecting plates:Insights for capturing black carbon emitted from ships

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Journal of Environmental Sciences 2024年第2期136卷 559-569页

作者： Zhicheng Wu YifanWang Lingyu Shao Hao Zhang Haobo Dai Haidong Fan Chenghang Zheng Xiang Gao state key Lab of Clean Energy utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China Department of Earth and Environmental Sciences University of ManchesterOxford RoadUnited Kingdom Zhejiang Tiandi Environmental protection Engineering Co. Ltd.Hangzhou 310012China Baima Lake laboratory(Zhejiang Provincial laboratory of Energy and Carbon Neutrality) Hangzhou 310000China

Ships and other mobile pollution sources emitted massive ultrafine and low-resistivity particles containing black carbon(BC),which were harmful to human health and were difficult to capture by conventional electrostatic precipitators(ESPs).In this study,nanoscale carbon black was adopted as simulated particles(SP)with similar physicochemical properties for black carbon emitted from ships(SP-BC)to investigate the feasibility of using an ESP with square-grooved collecting plates for the removal of SP-BC at low *** increased applied voltage significantly improved the total collection of SP-BC whereas may also promote the conversion of relatively larger particle size SP-BC into nano-size below *** outlet number concentration of SP-BC under 27 kV at 130℃was three times that of the *** the reduction of the flow rate could strengthen the capture of SP-BC below20 nm,and under the combined action of low flow rate and maximum applied voltage,the collection efficiency of 20-100 nm SP-BC could exceed 90%.In addition,the escape and capture characteristics of SP-BC under long-term rapping were *** square-grooved collecting plate could effectively restrain the re-entrainment of collected SP-BC generated by rapping,and the nanoscale SP-BC was trapped in the grooves after *** results could provide insights into the profound removal of massive nanoscale black carbon emissions from mobile sources.

关键词： Simulated ship black carbon Electrostatic removal Square-grooved collecting plate Long-term rapping

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Theoretical analysis of hydrogen solubility in direct coal liquefaction solvents

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International Journal of coal Science & Technology 2024年第2期11卷 187-197页

作者： Xiaobin Zhang Aoqi Wang Xingbao Wang Wenying Li state key laboratory of Clean and Efficient coal utilization Taiyuan University of TechnologyTaiyuan 030024ShanxiChina College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China

The cyclic hydrogenation technology in a direct coal liquefaction process relies on the dissolved hydrogen of the solvent or oil participating in the hydrogenation ***,a theoretical basis for process optimization and reactor design can be established by analyzing the solubility of hydrogen in liquefaction *** studies of hydrogen solubility in liquefaction solvents are challenging due to harsh reaction conditions and complex solvent *** this study,the composition and content of liquefied solvents were *** model compounds,hexadecane,toluene,naphthalene,tetrahydronaphthalene,and phenanthrene were chosen to represent the liquefied solvents in chain alkanes and monocyclic,bicyclic,and tricyclic aromatic *** solubility of hydrogen X(mol/mol)in pure solvent components and mixed solvents(alkanes and aromatics mixed in proportion to the chain alkanes+bicyclic aromatic hydrocarbons,bicyclic saturated aromatic hydrocarbons+bicyclic aromatic hydrocarbons,and bicyclic aromatic hydrocarbons+compounds containing het-eroatoms composed of mixed components)are determined using Aspen simulation at temperature and pressure conditions of 373–523 K and 2–10 *** results demonstrated that at high temperatures and pressures,the solubility of hydrogen in the solvent increases with the increase in temperature and pressure,with the pressure having a greater ***-more,the results revealed that hydrogen is more soluble in straight-chain alkanes than in other solvents,and the solubility of eicosanoids reaches a maximum of *** hydrogen solubility in aromatic ring compounds decreased gradually with an increase in the aromatic ring *** influence of chain alkanes on the solubility of hydrogen predominates in a mixture of solvents with different mixing ratios of chain alkanes and aromatic *** solubility of hydrogen in mixed aromatic solvents is less than that in the corresponding single ***

关键词： Direct coal liquefaction Liquefaction solvents Process simulation Hydrogen solubility

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Recovery of Li, Ni, Co and Mn from spent lithium-ion batteries assisted by organic acids: Process optimization and leaching mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 518-530页

作者： Liuyi Ren Bo Liu Shenxu Bao Wei Ding Yimin Zhang Xiaochuan Hou Chao Lin Bo Chen School of resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China state Environmental protection key laboratory of Mineral Metallurgical resources utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Zhejiang New Era Zhongneng Recycling Technology Co. LtdShaoxing 312000China Shenzhen water Planning&Design Institute Co. LtdShenzhen 518000China

The proper recycling of spent lithium-ion batteries(LIBs)can promote the recovery and utilization of valuable resources,while also negative environmental effects resulting from the presence of toxic and hazardous *** this study,a new environmentally friendly hydro-metallurgical process was proposed for leaching lithium(Li),nickel(Ni),cobalt(Co),and manganese(Mn)from spent LIBs using sulfuric acid with citric acid as a *** effects of the concentration of sulfuric acid,the leaching temperature,the leaching time,the solid-liquid ratio,and the reducing agent dosage on the leaching behavior of the above elements were *** parameters were optimized using response surface methodology(RSM)to maximize the recovery of metals from spent *** maxim-um recovery efficiencies of Li,Ni,Co,and Mn can reach 99.08%,98.76%,98.33%,and 97.63%.under the optimized conditions(the sulfuric acid concentration was 1.16 mol/L,the citric acid dosage was 15wt%,the solid-liquid ratio was 40 g/L,and the temperature was 83℃ for 120 min),*** was found that in the collaborative leaching process of sulfuric acid and citric acid,the citric acid initially provided strong reducing CO_(2)^(-),and the transition metal ions in the high state underwent a reduction reaction to produce transition metal ions in the low ***,citric acid can also act as a proton donor and chelate with lower-priced transition metal ions,thus speeding up the dissolution process.

关键词： spent lithium-ion batteries leaching response surface methodology sulfuric acid citric acid

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Study on flow characteristics and phase holdup in a slurry bubble column coupled with mild agitation Author links open overlay panel

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Particuology 2024年第8期91卷 226-234页

作者： Qingyuan An Jiantao Li Lei Zhang Nailiang Wang Pengfei Zhang Zhenghong Luo Chunxi Lu state key laboratory of High-Efficiency coal utilization and Green Chemical Engineering Ningxia UniversityYinchuan750021China state key laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of Petroleum BeijingBeijing102249China Department of Chemical&Biological Engineering Monash UniversityVictoria3800Australia

A pilot-scale experimental setup was constructed to investigate the effect of mild agitation on the bubble characteristics and phase holdup in a slurry bubble *** agitation positively impacts the axial uniform distribution of solid holdup,though it shows insignificant influence on the radial *** homogenous regime,mild agitation promotes the coalescence of bubbles,and the effect becomes stronger with increasing agitator *** mild agitation contributes to a decrease in bubble size in heterogeneous flow *** agitation presents a significant effect on the gas holdup by adjusting the bubble size and bubble motion *** modification was introduced to predict the gas holdup considering the effects of mild agitation,a necessary consideration for applications requiring mild *** adapted model predicts gas holdup with a maximum error of 12.9%.

关键词： Slurry bubble column Mild agitation Phase holdup Bubble characteristics

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AMicroseismic Signal Denoising Algorithm Combining VMD and Wavelet Threshold Denoising Optimized by BWOA

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 187-217页

作者： Dijun Rao Min Huang Xiuzhi Shi Zhi Yu Zhengxiang He Zijin mining Group Co. Ltd.Xiamen361016China Zijin(Changsha)Engineering Technology Co. Ltd.Changsha410006China state key laboratory of Comprehensive utilization of Low-Grade Refractory Gold Ores Shanghang364204China School of resources and Safety Engineering Central South UniversityChangsha410083China School of resources&Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China Zijin School of Geology and mining Fuzhou UniversityFuzhou350116China state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and TechnologyXuzhou221116China

The denoising of microseismic signals is a prerequisite for subsequent analysis and *** this research,a new microseismic signal denoising algorithm called the Black Widow Optimization Algorithm(BWOA)optimized VariationalMode Decomposition(VMD)jointWavelet Threshold Denoising(WTD)algorithm(BVW)is *** BVW algorithm integrates VMD and WTD,both of which are optimized by ***,this algorithm utilizes VMD to decompose the microseismic signal to be denoised into several Band-Limited IntrinsicMode Functions(BLIMFs).Subsequently,these BLIMFs whose correlation coefficients with the microseismic signal to be denoised are higher than a threshold are selected as the effective mode functions,and the effective mode functions are denoised using WTD to filter out the residual low-and intermediate-frequency ***,the denoised microseismic signal is obtained through *** ideal values of VMD parameters and WTD parameters are acquired by searching with BWOA to achieve the best VMD decomposition performance and solve the problem of relying on experience and requiring a large workload in the application of the WTD *** outcomes of simulated experiments indicate that this algorithm is capable of achieving good denoising performance under noise of different intensities,and the denoising performance is significantly better than the commonly used VMD and Empirical Mode Decomposition(EMD)*** BVW algorithm is more efficient in filtering noise,the waveform after denoising is smoother,the amplitude of the waveform is the closest to the original signal,and the signal-to-noise ratio(SNR)and the root mean square error after denoising are more *** case based on Fankou Lead-Zinc Mine shows that for microseismic signals with different intensities of noise monitored on-site,compared with VMD and EMD,the BVW algorithm ismore efficient in filtering noise,and the SNR after denoising is higher.

关键词： Variational mode decomposition microseismic signal denoising wavelet threshold denoising black widow optimization algorithm

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A novel box-counting method for quantitative fractal analysis of threedimensional pore characteristics in sandstone

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International Journal of mining Science and Technology 2024年第4期34卷 479-489页

作者： Huiqing Liu Heping Xie Fei Wu Cunbao Li Renbo Gao state key laboratory of coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China School of resources and Safety Engineering Chongqing UniversityChongqing 400030China Guangdong Provincial key laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and utilization Shenzhen UniversityShenzhen 518060China Shenzhen key laboratory of Deep Underground Engineering Sciences and Green Energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China

Fractal theory offers a powerful tool for the precise description and quantification of the complex pore structures in reservoir rocks,crucial for understanding the storage and migration characteristics of media within these *** with the challenge of calculating the three-dimensional fractal dimensions of rock porosity,this study proposes an innovative computational process that directly calculates the three-dimensional fractal dimensions from a geometric *** employing a composite denoising approach that integrates Fourier transform(FT)and wavelet transform(WT),coupled with multimodal pore extraction techniques such as threshold segmentation,top-hat transformation,and membrane enhancement,we successfully crafted accurate digital rock *** improved box-counting method was then applied to analyze the voxel data of these digital rocks,accurately calculating the fractal dimensions of the rock pore *** numerical simulations of permeability experiments were conducted to explore the physical correlations between the rock pore fractal dimensions,porosity,and absolute *** results reveal that rocks with higher fractal dimensions exhibit more complex pore connectivity pathways and a wider,more uneven pore distribution,suggesting that the ideal rock samples should possess lower fractal dimensions and higher effective porosity rates to achieve optimal fluid transmission *** methodology and conclusions of this study provide new tools and insights for the quantitative analysis of complex pores in rocks and contribute to the exploration of the fractal transport properties of media within rocks.

关键词： 3D fractal analysis Fractal dimension Rock pore structure Box-counting method Permeability simulation Computational geosciences

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水压-氯盐侵蚀耦合作用下膏体充填材料力学性能实验研究

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Journal of Central South University 2024年第5期31卷 1574-1591页

作者：李宗蓄尹大伟柳慧敏谭毅李学龙 state key laboratory of Mine Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China state key laboratory of mining Response and Disaster Prevention and Control in Deep coal Mines Anhui University of Science and TechnologyHuainan 232001China Henan key laboratory for Green and Efficient mining&Comprehensive utilization of Mineral resources Henan Polytechnic UniversityJiaozuo 454000China

在膏体充填开采中,煤矸石-粉煤灰胶结充填材料(CGFB)可有效控制地表沉降。CGFB在被注入采空区后会受到水压影响和氯离子侵蚀。因此,研究水压和氯离子侵蚀对CGFB性能的影响对于实现有效的绿色开采至关重要。将CGFB试样在0、0.5、1.5或3.0... 详细信息

在膏体充填开采中,煤矸石-粉煤灰胶结充填材料(CGFB)可有效控制地表沉降。CGFB在被注入采空区后会受到水压影响和氯离子侵蚀。因此,研究水压和氯离子侵蚀对CGFB性能的影响对于实现有效的绿色开采至关重要。将CGFB试样在0、0.5、1.5或3.0 MPa的氯化钠溶液中浸泡15天,通过单轴压缩试验、声发射信号监测、数字散斑应变测量、扫描电子显微镜和X射线衍射研究了试样的力学性能和劣化机理。结果表明,随着浸泡压力的增加,试样单轴抗压强度先增大后减小。当浸泡压力从0 MPa增加到1.5 MPa时,平均单轴抗压强度增加了43.5%。当浸泡压力从1.5 MPa增加到3.0 MPa时,平均单轴抗压强度下降18.9%。此外,水压会促进氯离子进入CGFB内部并产生弗里德尔盐。较高的水压-氯盐耦合作用增加了CGFB的孔隙率,与0 MPa样品相比,3.0 MPa样品的孔隙率增加8.2%。高水压作用下,膏体充填体内部孔隙裂纹发育贯通,力学性能劣化,其密实度与抗压强度下降。

关键词：水压氯盐侵蚀煤矸石-粉煤灰充填变形局部化带声发射信号细观形貌

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Effect of oxide interactions on chromium speciation transformation during simulated municipal solid waste incineration

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Journal of Environmental Sciences 2024年第8期142卷 11-20页

作者： Guodong Zhao Chong Tian Peidong Wu Xuguang Zhang Zhikang Wang Xiaoxiang Chen Zhuo Xiong Yongchun Zhao Junying Zhang state key laboratory of coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China National Environmental protection Engineering Technology Center for Trace Elements Pollution Control and Low Carbon utilization of coal Huazhong University of Science and TechnologyWuhan 430074China School of Environmental Engineering Wuhan Textile UniversityWuhan 430200China

Chromium released during municipal solid waste incineration(MSWI)is toxic and *** removal of chromium from simulated MSWI flue gas by four sorbents(CaO,bamboo charcoal(BC),powdered activated carbon(PAC),and Al_(2)O_(3))and the effects of four oxides(SiO_(2),Al_(2)O_(3),Fe_(2)O_(3),and CaO)on chromium speciation transformationwere *** results showed that the removal rates of total Cr by the four sorbents were Al_(2)O_(3)

关键词： Cr(Ⅵ)reduction Cr(Ⅲ)oxidation Alkali oxides Acidic oxides Municipal solid waste incineration

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