Article
Energy & Fuels
Yuejian Lu, Dameng Liu, Yidong Cai, Qian Li, Yingfang Zhou
Summary: Capillary forces play a crucial role in the gas/fluid behavior and fluid distribution in porous media, particularly in evaluating the pore-fracture characteristics of coal. Different stages of spontaneous imbibition process can reveal the fluid flow characteristics, while a low flow-back rate of fracturing fluid may lead to severe permeability damage in coal. The gas relative permeability of coal attenuates exponentially with imbibition time, showing the influence of capillary force based on fractal theory.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Changbao Jiang, Yang Yang, Wenhui Wei, Minke Duan, Tang Yu
Summary: This study experimentally investigated the mechanical properties and seepage characteristics of raw coal samples in the process of coalbed methane extraction, proposed the change rate of information entropy as a damage characterization parameter, and developed a permeability evolution model under loading and unloading conditions.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Andre Euler, Sara Wullschleger, Thomas Sartoretti, Daniel Mueller, Etienne Xavier Keller, Dejan Lavrek, Olivio Donati
Summary: This study assessed the accuracy of low-dose dual-energy computed tomography (DECT) to differentiate uric acid from non-uric acid kidney stones. The results showed that DECT accurately discriminated uric acid and non-uric acid stones, even at small stone sizes.
EUROPEAN RADIOLOGY
(2023)
Article
Engineering, Environmental
Chao Li, Yong Qin, Tao Guo, Jian Shen, Yi Yang
Summary: This study measured the high-pressure adsorption isotherms of two coal samples to investigate the methane adsorption process and mechanisms in coal. The results showed that micropore filling and surface adsorption are the primary adsorption mechanisms for supercritical methane in coal, with micropore filling occurring in pores smaller than 1.1 nm and surface adsorption occurring in 1-2 nm pores. Micropore filling adsorption plays a significant role in the overall methane adsorption, and the nano-confined effect and low water saturation contribute to the enrichment of free gas in deep coalbed methane (CBM). These findings provide insights into the occurrence behavior of unconventional natural gas in reservoirs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yang Yang, Changbao Jiang, Xianwei Guo, Shoujian Peng, Jingjing Zhao, Fazhi Yan
Summary: This study conducted a seepage experiment under constant axial stress and tiered cyclic unloading-loading confining pressure, proposing two new damage variables. The results showed that plastic deformations and permeability of coal increased with unloading levels, with a reverse trend when unloading level was large. The experiment also revealed the coexistence of Kaiser effect and Felicity effect, and the relationship between dissipated energy and cycle number shifted from logarithm to linear as unloading levels increased.
Article
Energy & Fuels
Sijian Zheng, Yanbin Yao, Shuxun Sang, Dameng Liu, Meng Wang, Shiqi Liu
Summary: This study investigates the dynamic characteristics of multiphase methane in CO2-ECBM through the use of self-designed nuclear magnetic resonance measurement. The results show that the injection of CO2 improves the desorption efficiency of adsorbed methane. The CO2-CH4 displacement rates vary in different stages, and a low concentration ratio of CH4/CO2 significantly enhances methane recovery.
Article
Radiology, Nuclear Medicine & Medical Imaging
Uttam K. Bodanapally, Thorsten R. Fleiter, Bizhan Aarabi, Ajay Malhotra, Dheeraj Gandhi
Summary: This technical note introduces a new DECT protocol and iodine map reconstruction technique for visualizing membranes in chronic subdural hematoma. Results showed that all 50 hematomas had an enhancing external membrane, with 13 having an incomplete internal membrane and 23 having a complete internal membrane. A spandrel sign indicating partial or complete formation of the internal membrane was observed in 36 hematomas.
EUROPEAN RADIOLOGY
(2023)
Article
Energy & Fuels
Yafei Luo, Binwei Xia, Honglian Li, Huarui Hu, Mingyang Wu, Kainan Ji
Summary: Coal is a dual-porosity medium with internal pore-fracture structure, and understanding the relationship between permeability and pore-fracture structure characteristics is crucial for predicting coalbed methane productivity accurately. A new fractal permeability model of dual-porosity media embedded with natural tortuous fractures has been established in this study, showing improved accuracy in predicting coal seam permeability compared to traditional models. The numerical simulation results demonstrate strong power-law relationships between coal permeability and fracture geometric characteristic parameters, validating the proposed model's accuracy.
Article
Energy & Fuels
Xianglong Wang, Jienan Pan, Kai Wang, Pengwei Mou, Jianxin Li
Summary: This study conducted a laboratory simulation of hydraulic fracturing in coal and used X-ray computer tomography (CT) and digital volume correlation (DVC) to analyze and quantify the changes in fractures induced by hydraulic fracturing. The results showed that hydraulic fracturing increased the aperture, volume, and surface area of fractures in coal, and simplified their morphology. The study also revealed the significant influence range and connectivity of fractures caused by hydraulic fracturing.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Thermodynamics
Jun Li, Qiming Huang, Gang Wang, Enmao Wang, Shuang Ju, Cunli Qin
Summary: Slickwater fracturing has a significant impact on the pore structure of coal seams, resulting in a decrease in pore volume and specific surface area, as well as severe blockage of micropores by residual liquid. The development of a gel breaker suitable for slickwater can improve the flowback effect and reduce reservoir damage.
Article
Energy & Fuels
Jianwei Tian, Jishan Liu, Derek Elsworth, Yee-Kwong Leong, Wai Li
Summary: In this study, a dual-fractal permeability model was proposed to investigate the impacts of coal internal structure on permeability. The model considers the effects of pore-fracture size distribution and effective stress, and incorporates multiple flow mechanisms.
Article
Energy & Fuels
Chaoping Xu, He Li, Jiexin Lu, Yi Lu, Shiliang Shi, Qing Ye, Min Li, Zheng Wang
Summary: This paper presents a comprehensive analysis of the evolutionary characteristics of the macromolecular structure of coal using X-ray diffraction and Raman spectroscopy. The results show that microwave irradiation triggers the conversion of ordered graphitic carbon to amorphous carbon, as well as the condensation and spatial arrangement of aromatic clusters. Microwave-assisted oxidation facilitates the directional growth of aromatic rings and the cross-linking of aliphatic chains, and induces the rotation, displacement, stacking, and gradual parallel alignment of aromatic lamellae, thereby improving the integrity of the graphite structure and the orderliness of the macromolecular structure.
Article
Engineering, Environmental
E. Puskarczyk, P. Krakowska-Madejska, M. Dohnalik, I Jelonek
Summary: The influence of coal petrographic parameters on geomechanical tests was investigated through the analysis of two coal samples from the Polish Upper Silesian Coal Basin. The results indicated a relationship between geomechanical properties and the sum of reactive and inert macerals.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Energy & Fuels
H. J. Smith, H. D. Schweitzer, E. P. Barnhart, W. Orem, R. Gerlach, M. W. Fields
Summary: This study focused on the Birney test site in Montana, USA, using algal biomass as an amendment to examine its effect on organic matter degradation and enhanced CBM production potential. Results showed methane production was only detected in low sulfate wells, and different groups of syntrophic bacteria may play a key role in coal degradation.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Review
Radiology, Nuclear Medicine & Medical Imaging
Shanigarn Thiravit, Christina Brunnquell, Larry M. Cai, Mena Flemon, Achille Mileto
Summary: DECT has significant advantages in renal mass evaluation, helping to identify incidentally discovered masses and provide additional information. Virtual unenhanced and iodine density DECT images should be interpreted side-by-side to avoid misinterpretation.
EUROPEAN RADIOLOGY
(2021)
Article
Energy & Fuels
Junjian Wang, Li Chen, Qinjun Kang, Sheik S. Rahman
Review
Thermodynamics
Junjian Wang, Li Chen, Qinjun Kang, Sheik S. Rahman
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Energy & Fuels
Junjian Wang, Sheik S. Rahman
SPE RESERVOIR EVALUATION & ENGINEERING
(2016)
Article
Energy & Fuels
Junjian Wang, Qinjun Kang, Yuzhu Wang, Rajesh Pawar, Sheik S. Rahman
Article
Energy & Fuels
Junjian Wang, Qinjun Kang, Li Chen, Sheik S. Rahman
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2017)
Article
Energy & Fuels
Hao Chen, Dazhen Tang, Song Li, Hao Xu, Shu Tao, Junjian Wang, Yanfei Liu
Summary: The study conducted tests on six coal samples using low-field nuclear magnetic resonance, revealing that the total pore space increased and then decreased with the increase of coal rank. The proportion of adsorption space gradually increased, while the seepage space showed an opposite trend. The research findings help to better understand pore and heterogeneity changes in coal mines.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Environmental Sciences
Junjian Wang, Dazhen Tang, Yu Jing
WATER RESOURCES RESEARCH
(2019)
Article
Energy & Fuels
Jincheng Ye, Shu Tao, Song Li, Dazhen Tang, Junjian Wang, Hao Xu
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2019)
Article
Engineering, Chemical
Jie Yi, Huilin Xing, Junjian Wang, Zhaohui Xia, Yu Jing
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Energy & Fuels
Yu Jing, Arash Rabbani, Ryan T. Armstrong, Junjian Wang, Peyman Mostaghimi
Article
Thermodynamics
Jie Yi, Lingli Liu, Zhaohui Xia, Junjian Wang, Yu Jing, Lijiang Duan
Summary: This study investigated two-phase flow in rough-walled fractures with different surface wettability using an improved lattice Boltzmann model and a discrete fracture network model. The impact of contact angle and fracture aperture on fluid flow distribution, velocity field, and relative permeability curves was clarified. It was found that fluid relative permeability in rough-walled fractures can exhibit instabilities due to wettability-related microscale fluid distribution.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Jie Yi, Shun-Li He, Leng Tian, Ji-Xiang Ma, Jun-Jian Wang
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.