Article
Construction & Building Technology
Ze Xia, Qiangling Yao, Xuehua Li, Linli Yu, Changhao Shan, Yong Li, Yisong Hao
Summary: This study investigated the effect of carbon fiber-reinforced polymer (CFRP) jacketing on the mechanical properties, crack evolution, and energy dissipation mechanism of coal specimens. Experimental results showed that CFRP jackets had a significant influence on the core failure process of coal specimens, changing the crack classification mode and localization of acoustic emission events.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Xiangguo Kong, Mengzhao Zhan, Yuchu Cai, Pengfei Ji, Di He, Tianshuo Zhao, Jie Hu, Xi Lin
Summary: In deep underground mine engineering, accurately identifying precursor signals of coal fracture is crucial. A uniaxial compression test was conducted to capture the deformation and destruction courses of coal samples using acoustic emission (AE) technology. The results show significant discrepancies in coal strength affected by initial pore fissures. During the loading process, AE energy signals exhibited stage characteristics, with a high risk of rapid coal energy storage during the unstable rupture development (URD) stage, predicting coal destruction. The variance mutation point was easier to identify than the autocorrelation coefficient, and all precursor points were in the URD stage, providing more accurate predictions than the AE cumulative energy curve slope.
Article
Engineering, Environmental
Yunliang Tan, Qing Ma, Xuesheng Liu, Zenghui Zhao, Mingxin Zhao, Liang Li
Summary: Predicting and preventing catastrophic accidents in rock engineering has always been a long-term goal. This study investigates the failure prediction and characteristics of rock-coal-floor (RCF) sandwich composite samples using numerical simulation and laboratory tests. The results suggest that the crack ratio K can serve as a precursor to RCF failure, providing important reference value for monitoring and predicting rock disasters.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Shuangwen Ma, Han Liang, Chen Cao
Summary: Acoustic emission (AE) is widely used in coal mechanics studies to analyze the influence of loading rate or water content changes on mechanical properties. Different strength coals exhibit varied deformation behaviors, with hard coal showing brittleness related to disasters like coal bursts, and soft coal displaying soft rock properties. This study examined the deformation patterns and AE characteristics of coal with different strengths, highlighting differences in bearing capacity, fracture distribution, and energy dissipation between hard and soft coal.
Article
Metallurgy & Metallurgical Engineering
Guo Yu-xia, Zhao Yong-hui, Wang Sheng-wei, Feng Guo-rui, Zhang Yu-jiang, Ran Hong-yu
Summary: The study investigated the mechanical properties of coal rocks under different H/D ratios through uniaxial compression tests. The results showed that the strength and strain of coal rocks increase as H/D decreases, and the coal rock failure process can be divided into four stages, with different AE activities observed under various H/D ratios.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Construction & Building Technology
Jiaojiao Yang, Huagang Zhang, Tao Yu, Keke Sun, Yong Zheng
Summary: Plant-fiber/magnesium oxychloride cement composites (PF-MOC) are bio-composite building materials that can promote the reuse of bio-waste and compensate for the shortage of wood. This study investigated the compressive characteristics of PF-MOC and established a compressive stress-strain relationship model and a compressive strength prediction model.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Bin Fu, Chun'an Tang
Summary: Through conducting three different cyclic loadings on marble, it was found that the continuous decreasing correlation dimension and b value can be considered a robust signal of imminent rock failure. Additionally, extra cyclic loadings increase low-energy AE events and cause a change in AE distribution.
GEOMECHANICS AND ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Han Meng, Liyun Wu, Yuzhong Yang, Fei Wang, Lei Peng, Lei Li
Summary: By conducting compression tests on briquette coal samples with 7% content of different binders, it was found that the AE signal average values of the briquette coal samples exceeded those of the raw coal samples, indicating potential for analog modeling applications.
Article
Green & Sustainable Science & Technology
Yixin Zhao, Xiang Fu, Yangyang Shi, Bowen Zhao, Xingyu Fu, Xiufeng Zhang, Yang Chen
Summary: This study investigates the mechanical response of white sandstone, yellow sandstone, and coal with different thicknesses of thin spray-on liners (TSLs) through laboratory tests and theoretical analysis. The results show that increasing the TSL coating thickness improves the uniaxial compressive strength (UCS) of the rocks and coal, but reduces their energy absorption capacities.
Article
Construction & Building Technology
Guang-Ming Wu, Ruiqing Han, Shengli Li, Pan Guo
Summary: Brick masonry structures will suffer damage in long-term service, with compression and shear being common damage modes. Research has shown that shear damage exhibits more obvious brittle characteristics, and acoustic emission technology can effectively assess the damage state of brick masonry.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Engineering, Mechanical
Mengyang Zhai, Chao Xu, Lei Xue, Yuan Cui, Jinyu Dong
Summary: This study investigates the loading rate dependence of acoustic emission (AE) characteristics and the damage process of granite. The results show that the formation and evolution of cracks within the rock can be characterized by AE parameters and real-time spatial AE locations. The loading rate affects the cumulative AE count, the cumulative AE energy, and the distribution modes of fractures. The dominant failure mechanism also transitions from shear to tensile with increasing loading rate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geochemistry & Geophysics
Yuhe Cai, Yi Xue, Faning Dang, Linchao Wang, Xue Li, Shanjie Su, Shengcheng Wang, Xinyu Liang, Shaowei Zhang
Summary: This study investigates the effects of liquid nitrogen cyclic treatment on coal samples from Jiaozuo area using Brazil's indirect tensile testing. The results show that liquid nitrogen significantly influences the formation and development of coal fractures. The study also reveals that the maximum load-bearing capacity of coal decreases with an increased number of cyclic treatments, indicating a reduction in effective stress on coal samples. Furthermore, the acoustic emission activity intensity of coal mass increases with the number of freeze-thaw cycles of liquid nitrogen.
Article
Chemistry, Physical
Ling Fan, Chengbo Wang, Di Hu
Summary: Rock masses are inherently heterogeneous and contain fractures that affect their mechanical properties, fracture characteristics, and acoustic emission features. Microbially induced calcite precipitation (MICP) technology can repair fractured rock masses. In this study, uniaxial compression tests were conducted on sandstone samples with prefabricated fractures, and the effects of MICP repair were analyzed. The results showed improved properties and mitigated failure process in the filled specimens. The study provides a theoretical basis and experimental evidence for repairing rock fractures using MICP technology.
Article
Chemistry, Multidisciplinary
Mingtao Gao, Hongyu Yan, Huiqiang Duan, Si Xiong
Summary: This study conducted experimental tests on the mechanical properties and acoustic emission characteristics of low-strength coal specimens during cyclic loading and unloading, providing theoretical support for understanding the damage evolution of coal specimens.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Environmental
Yixin Zhao, Bin Liu, Chunwei Ling, Yirui Gao, Xiaoliang Wang, Nima Noraei Danesh
Summary: The mechanical properties and deformation characteristics of sandstone are influenced by granularity. Uniaxial compression tests were conducted on sandstone specimens with different granularities, and infrared radiation temperature (IRT) and acoustic emission (AE) events were monitored. The results show that AE energy decreases with granularity during the crack closure stage. The spatial evolution of AE and AIRT is similar for sandstone with different granularities, and the high-temperature area is consistent with the AE concentration area.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Yuqi Song, P. G. Ranjith, Bailin Wu, Zhenlong Song
Summary: Sand production is a long-standing challenge in the oil and gas industry, with research showing that sand arches have complex 3-D structures and arches with coarser sand grains are more stable. The introduction of static friction can lead to the formation of concave sand arches.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. G. P. Kumari
Summary: The study revealed that fractures generated in shale and siltstone formations during hydraulic fracturing exhibit different characteristics, and flow behavior is influenced by factors such as fracture tortuosity and proppant concentration.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Yi Xue, Jia Liu, P. G. Ranjith, Zhizhen Zhang, Feng Gao, Songhe Wang
Summary: This study conducted triaxial compression tests on coal under different gas pressure conditions to explore the influence mechanism of gas pressure on coal deformation, failure, and energy evolution. The mechanical properties, acoustic emission energy characteristics, and nonlinear characteristics of coal containing gas were obtained based on the test data. A theoretical formula for analyzing energy evolution was introduced and verified by test data. The research results indicate that energy rate can be used as a new effective mechanical parameter to analyze and predict the damage and failure characteristics of coal. The findings on energy dissipation characteristics and the defined ratio of dissipative energy rate and input energy rate provide insights for understanding the fracturing evolution and energy driving mechanism of coal.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
M. H. Samarakoon, P. G. Ranjith, W. A. M. Wanniarachchi
Summary: This study examines the effects of carbonation on the properties and mechanisms of cement, showing that alkali-activated cements with higher calcium content exhibit better mechanical properties and a denser microstructure when exposed to carbonate brine.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Thermodynamics
Jizhao Xu, Cheng Zhai, Pathegama Gamage Ranjith, Shuxun Sang, Yong Sun, Yuzhou Cong, Wei Tang, Yangfeng Zheng
Summary: The study investigated the effects of liquid CO2 on coal strength, finding that the coupled effects of liquid CO2 temperature and adsorption can influence coal fracture behavior and crack morphology.
Article
Energy & Fuels
Jizhao Xu, Cheng Zhai, P. G. Ranjith, Shuxun Sang, Xu Yu, Yong Sun, Yuzhou Cong, Yangfeng Zheng, Wei Tang
Summary: The study found that coal affected by liquid CO2 exhibited more complex destruction patterns, larger fractal dimensions, and greater structure degradation. The affected coals showed diverse mechanical responses, with temperature shock and CO2 adsorption potentially leading to crack growth and strength deterioration, ultimately destroying the coal with smaller yield strength.
Article
Energy & Fuels
David Lall, Vikram Vishal, M. V. Lall, P. G. Ranjith
Summary: The study found that gas production was less efficient in the presence of a permeable heterogeneity compared to other scenarios. The permeability affects the vertical extent of dissolved methane volume during thermal stimulation and huff and puff, while well depth influences the radial extent of dissociated molecules.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Chunlin Zhong, Zhenyu Zhang, P. G. Ranjith, Chengpeng Zhang, Kangsheng Xue
Summary: The study found that pore water can affect the radial and volumetric strain evolution of coal, leading to dilation deformation. Additionally, due to the water propping effect, the cracks in saturated coal cannot close tightly during loading, causing sliding and generating numerous tensile cracks. Loading frequency can impact the decay of pore pressure, consequently influencing the number of cracks in coal.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Shashika Gajanayake, Ranjith Pathegama Gamage, Pabasara Wanniarachchige, Decheng Zhang
Summary: This study conducted molecular dynamic simulations to investigate the effects of temperature, pressure, and initial CO2 concentration on gas replacement characteristics for methane recovery and CO2 storage. The results showed that higher temperatures resulted in greater methane recovery, but diminished CO2 storage capacity. Higher initial CO2 concentrations facilitated better CO2 penetration into the hydrate structure, leading to increased methane recovery and improved CO2 storage.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
P. Cheng, C. P. Zhang, Z. Y. Ma, J. P. Zhou, D. C. Zhang, X. F. Liu, H. Chen, P. G. Ranjith
Summary: Nanoindentation tests were conducted to investigate the effects of ScCO2-water treatment on shale matrix micromechanics, revealing significant heterogeneity in the properties of different minerals. Observation of indentation morphologies showed that considerable micro-fractures were generated in clay minerals, correlated to significant plastic deformation and layered crystal structures.
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. Zheng, D. D. Tannant, V. R. S. De Silva, T. D. Rathnaweera
Summary: This study provides a grain-scale analysis of the fracture evolution mechanisms of proppant crushing, rock fracture damage during proppant embedment, and the influence of realistic reservoir/fracture fluid on proppant embedment. The results reveal that the selection of an appropriate proppant type is vital in quantifying the degree of proppant crushing and embedment within fractures.
Article
Thermodynamics
Guanglei Zhang, P. G. Ranjith, Qiao Lyu
Summary: This study reveals the effects of CO2 on the micro and nano-scale properties of coal, confirms the softening effects of CO2 on coal, and indicates that these changes are reversible to some extent.
Article
Energy & Fuels
B. Balinee, P. G. Ranjith, Herbert E. Huppert
Summary: The article discusses the impact of building material production on global carbon emissions and presents methods to reduce environmental impact through the use of waste and carbon sequestration. By incorporating discarded aluminum foil and industrial waste gases into cement, the performance and sustainability of cement can be improved. This approach significantly reduces carbon emissions, lowers costs, and stores a large amount of CO2.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Geological
V. R. S. De Silva, H. Konietzky, H. Mearten, P. G. Ranjith, W. G. P. Kumari
Summary: This study proposes a novel approach called the hybrid rock pre-conditioning method to enhance the sustainability and efficiency of low-grade ore mining. The method involves the use of soundless cracking demolition agents (SCDAs) to initiate radial fractures in a predrilled host rock, followed by hydraulic stimulation to extend the fractures. The results show that this method can create a high density of fractures around the injection well, and key factors such as rock mass heterogeneity and stress anisotropy affect its performance.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
M. H. Samarakoon, P. G. Ranjith
Summary: Ensuring the intactness of cement sheaths is crucial for deep well applications in extreme underground conditions. This study investigates the behavior of wellbore materials, including steel casing, annulus cement sheaths, and surrounding rock formations, under continuous steam injection. The results show that materials in carbonate formations are more vulnerable to stress than those in sandstone formations, and the retention time of maximum temperature in cement sheaths is shorter in sandstone than in carbonate. It is also found that the cement sheaths in compliant formations like sandstone may fail due to tensile cracking along the thinnest thickness.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.