Article
Mining & Mineral Processing
Qingyi Tu, Yuanping Cheng, Sheng Xue, Ting Ren, Xiang Cheng
Summary: The research investigated the crushing work ratios and gas desorption properties of intact coal, concluding that high levels of transport work and gas are needed for crushing intact coal, exceeding the transport work significantly. The study also found that the required minimum stress for crushing intact coal exceeds the in-situ stresses available at mining depths of 300-700 meters.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Haidong Wang, Zhiheng Cheng, Quanle Zou, Zhenhua Li, Fulong Sun, Hongwei Yang, Yun Lei
Summary: The proper understanding and utilization of liquid CO2 phase transition fracturing technology is crucial for reducing CO2 emissions and increasing coalbed methane production. By implementing this technology in outburst-prone coal seams, it is possible to improve gas extraction speed, increase gas permeability, and effectively suppress coal seam outbursts.
Article
Geosciences, Multidisciplinary
Liang Cheng, Jiang Xu, Shoujian Peng, Lei Qin, Fazhi Yan, Yang Bai, Bin Zhou
Summary: Coal-and-gas outburst (CGO) is a major challenge in coal mining, and the initial gas pressure has a significant influence on the flow characteristics of CGO airflow. The study found that the gas pressure decreases periodically or continuously during the CGO process, and the static pressure in the roadway shows alternating positive-negative pressure transition. The increase in coal seam initial gas pressure leads to higher velocity and longer duration of high-speed airflow in the roadway.
NATURAL RESOURCES RESEARCH
(2022)
Article
Thermodynamics
Gang Bai, Jun Su, Xueming Li, Chunsheng Guo, Mingxu Han, Xihua Zhou, Chaojun Fan
Summary: The study proposes an SBS-CO2 method that gradually increases the CO2 injection pressure, which can improve the total recovery rate of methane and reduce the risk of CO2 consumption and outburst compared to the traditional constant CO2 injection pressure method.
Article
Geochemistry & Geophysics
Jie Cao, Qianting Hu, Yanan Gao, Minghui Li, Dongling Sun
Summary: Due to insufficient understanding of the outburst mechanism, coal and gas outburst disasters in China are serious. By simulating and analyzing the distribution of stress, deformation, gas flow, and expansion energy in coal seams using COMSOL Multiphysics, it was found that gas expansion energy significantly influences coal seams.
Article
Energy & Fuels
Jun Tang, Yonghan Long, Lei Zhang, Shipan Zeng, Shixiang Tian, Cun Zhang
Summary: Coal seam gas extraction is vital for green mining, and enhanced coalbed methane recovery (ECBM) through gas injection has been proposed as an effective and eco-friendly method. The study investigates the impact of coal rank on CO2-ECBM efficiency using different coal types - lignite, bituminous coal, and anthracite. The results show that lignite and anthracite display higher rates of CO2 and CH4 outflow, as compared to bituminous coal. Additionally, coal rank influences permeability and CH4 production, with differences observed in the two phases.
Article
Energy & Fuels
Zhenzhi Wang, Ze Deng, Xuehai Fu, Hao Chen, Jienan Pan, He Zhou
Summary: The study found that increasing gas content in N-2-ECBM recovery leads to volume shrinkage and decreased permeability in specimens, but CH4 desorption during N-2-IS can enhance permeability.
Article
Green & Sustainable Science & Technology
Feng Zhang
Summary: The geological structures of coal fields in China are complex. With an increase in mining depth, the coal seams exhibit high gas and low permeability characteristics, which intensify the potential for coal and gas outbursts during mining. Gas drainage is a primary measure used to prevent and control gas disasters, and improving coal seam permeability is crucial. This study investigated the technology of liquid CO2 phase-transition fracturing in coal seams. Field tests at Baode Coal Mine showed positive results, with a significant increase in drainage effect, gas-drainage concentration, and permeability coefficient.
Article
Energy & Fuels
Zhengshuai Liu, Longyong Shu, Zhonggang Huo, Yongpeng Fan
Summary: Most coal and gas outbursts occur in the coal thickness variation zone, but it is difficult to explain the mechanism of outbursts in coal thickening areas through physical simulation experiments. By establishing a coupled multi-field model, this study investigated the evolution of stress, gas pressure, and plastic failure zones in coal seams with different variation gradients and amplitudes of coal thickness. The research provides theoretical support for preventing and controlling outbursts in coal seam thickening areas during mining.
Article
Thermodynamics
Lijun Zhou, Xihua Zhou, Chaojun Fan, Gang Bai, Lei Yang, Yiqi Wang
Summary: Flue gas (CO2/N2) injection into coal seam achieves reduction of greenhouse gas emission and enhancement of methane recovery. An improved heat-solid-fluid coupling model is proposed to simulate the interaction between solid deformation, fluid transport, heat conservation, and porosity/permeability. Results show that the proposed model accurately represents the complex interactions and prevents the sharp reduction of permeability caused by pure CO2 injection. The effective extraction zone of flue gas injection expands faster than primary and CO2 promoted extraction, with influencing factors including initial permeability, injection pressure, N2 and CO2 adsorption strain ratio, injection temperature, and thermal expansion coefficient.
Article
Geosciences, Multidisciplinary
Zhiheng Cheng, Hui Pan, Quanle Zou, Zhenhua Li, Liang Chen, Jialin Cao, Kun Zhang, Yongguo Cui
Summary: With the increasing demand for coal resources, coal has been mined in deep coal seams, leading to great risks of coal and gas outburst. Protective coal seam mining, as a safe and effective method for gas control, has been widely used. This study investigated stress-seepage coupling laws and permeability characteristics of a protected coal seam during the process of protective coal seam mining.
NATURAL RESOURCES RESEARCH
(2021)
Article
Energy & Fuels
Jia Lin, Ting Ren, Gongda Wang, Patrick Booth, Yuanping Cheng, Dennis Black, Frank Hungerford, Jan Nemcik
Summary: Three stages of nitrogen injection were conducted in a coal mine to enhance gas drainage. The injection pressure had a significant impact on gas breakthrough time, with higher pressure resulting in shorter breakthrough time. Strong post-injection effects were observed, influenced by the volume of injected nitrogen. The coal seam gas content decreased after each injection stage, providing guidance for laboratory experiments, numerical modeling, and field application of this technology.
Article
Thermodynamics
Chaolin Zhang, Enyuan Wang, Bobo Li, Xiangguo Kong, Jiang Xu, Shoujian Peng, Yuexia Chen
Summary: CO2-ECBM recovery has the triple benefits of recovering clean resources, ensuring coal mine safety, and achieving CO2 geological sequestration. The study reveals that during CO2-ECBM recovery, the reservoir pressure remains high, methane recovery efficiency increases, but CO2 sequestration efficiency decreases with increasing injection pressure. A displacement index is proposed to reflect the synergistic effect of methane recovery and CO2 sequestration, and a dynamic pressure injection mode is suggested to enhance recovery and sequestration efficiency.
Article
Construction & Building Technology
Wei Wang, Yanzhao Wei, Minggong Guo, Yanzhi Li
Summary: The study analyzed the principles of integrated technology of explosion to address the challenges of high gas content and pressure, developed faults, complex structure, low permeability, and outburst risks in coal seams. Through numerical simulations and field experiments, it was demonstrated that hydraulic fracturing and deephole presplitting blasting technology effectively reduced the risk of coal and gas outbursts and improved gas drainage in low-permeability coal seams. These findings suggest promising applications in preventing and controlling gas hazards in the future.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Zhuang Lu, Liang Wang, Mingzhe Lv, Yang Lei, Hao Wang, Qingquan Liu
Summary: This study provides new insights into the theoretical study of coal and gas outburst in serious outburst coal seams and the control of coal and gas outburst by hydraulic measures.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Chemical
Yuntao Liang, Jian Zhang, Liancong Wang, Haizhu Luo, Ting Ren
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2019)
Article
Engineering, Geological
Qingyi Tu, Yuanping Cheng, Ting Ren, Zhenyang Wang, Jia Lin, Yang Lei
ROCK MECHANICS AND ROCK ENGINEERING
(2019)
Article
Engineering, Chemical
Zhen Zhang, Gaofeng Liu, Yunxing Cao, Jia Lin, Yi Jin, Baoan Xian, Runsheng Lv, Zhou Zhang
Summary: CS2 extraction can enhance the permeability of coal by improving the connectivity of multi-scale migration channels. The time effect of CS2 extraction on enhancing coal permeability is significant, with permeability enhancement becoming more pronounced after a longer treatment period. CS2 fracturing is worth exploring in ongoing studies to enhance permeability and CBM recovery in low-permeability reservoirs.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Environmental
Jia Lin, Ting Ren, Yuanping Cheng, Jan Nemcik
Summary: CO2 geo-sequestration in unminable coal seams shows promise in reducing greenhouse gas emissions and enhancing coal bed methane recovery, but faces challenges in permeability reduction effects post-injection.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Construction & Building Technology
Gaofeng Wang, Ting Ren, Gaolei Zhu
Summary: This study conducted a series of disc cutter indentation tests to explore the influence of confining stresses on rock fragmentation, thrust force, and penetration energy, with sandstone as the main material. The critical confining stress was found to be likely related to cohesion, and the Constant Cross Section (CCS) disc cutter was more favorable for rock fragmentation under confining stresses compared to the V shape disc cutter.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yue Dong, Xinguo Zhang, Jia Lin, Jinhai Zhao, Zixuan Meng
Summary: The mixed gangue, composed of equal-quality washed gangue and crushed gangue based on gradation theory, has better particle distribution, lower relative compaction degree, significantly improved compressive resistance, and effective control of surface deformation in solid filling.
FRONTIERS IN MATERIALS
(2021)
Article
Engineering, Geological
Jia Lin, Yuanping Cheng, Ting Ren, Qingquan Liu, Qingyi Tu
Summary: The cohesion of reconstituted coal increases with applied external force, with bond breakage mainly influenced by deviatoric stress and over-consolidation state observed under low confining pressure. Failure process is similar to intact coal, with strain-softening effect and internal slippage occurring before unstable fracture development.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Environmental Sciences
Xinguo Zhang, Yue Dong, Jinhai Zhao, Bin Gong, Zixuan Meng, Jia Lin
Summary: This study conducted laboratory testing on the coal slurry issue in underground coal mines and proposed a novel combined treatment method, which effectively removes suspended solids, improves coal mine water quality, and reduces environmental damage.
Article
Geochemistry & Geophysics
Haibo Liu, Zhihang Shu, Yinbin Shi, Xuebing Wang, Xucheng Xiao, Jia Lin
Summary: Gas flow in a coal seam is a complex process due to the unique structure of coal and sorption characteristics. Understanding gas migration patterns is essential for various engineering fields. Simulation studies show that gas drainage performance is greatly influenced by borehole size and drainage time.
Article
Energy & Fuels
Huan Liu, Gaofeng Liu, Zhen Zhang, Baolin Li, Nian Si, Wenbo Guan, Jia Lin
Summary: This study investigates the effects of liquid CO2 phase transition fracturing (L-CO2-PTF) treatment on coal. The results show that L-CO2-PTF can improve the connectivity and size of mesopores while reducing their volume and fractal dimension. These findings contribute to enhancing the desorption and diffusion capacity of coalbed methane.
Article
Energy & Fuels
Jia Lin, Ting Ren, Gongda Wang, Patrick Booth, Yuanping Cheng, Dennis Black, Frank Hungerford, Jan Nemcik
Summary: Three stages of nitrogen injection were conducted in a coal mine to enhance gas drainage. The injection pressure had a significant impact on gas breakthrough time, with higher pressure resulting in shorter breakthrough time. Strong post-injection effects were observed, influenced by the volume of injected nitrogen. The coal seam gas content decreased after each injection stage, providing guidance for laboratory experiments, numerical modeling, and field application of this technology.
Article
Energy & Fuels
Ming Qiao, Ting Ren, Jon Roberts, Xiaohan Yang, Zhongbei Li, Jianming Wu
Summary: Spontaneous combustion of coal is a significant issue in the coal mining industry. Research shows that the orientation of coal seams significantly impacts the gas distribution in the mine. Through simulation and on-site monitoring, it has been found that injecting nitrogen can effectively reduce the oxidation zone of coal and improve safety.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Energy & Fuels
Nian Si, Gaofeng Liu, Jia Lin, Ping Chang, Xiaoming Wang, Zhen Zhang, Huan Liu
Summary: This study investigates the effects of carbon disulfide (CS2) extraction on nanopores of anthracite samples. Various pore measurement techniques were employed to analyze the changes in nanopore structure and fractal characteristics. The results indicate that CS2 extraction leads to an enlargement of macropores and a reduction in their fractal dimension, a reduction in the size of mesopores but an increase in their volume, area, and fractal dimension, and an enlargement of micropores but a reduction in their volume, area, and fractal dimension. These effects are beneficial for enhancing coalbed methane transport and provide a theoretical basis for the chemical reservoir stimulation technique with CS2 extraction.
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.