Article
Geochemistry & Geophysics
Anhu Wang, Liming Qiu, Yingjie Liu, Quan Lou, Zuo Sun, Weixiang Wang
Summary: A multisignal nanosecond synchronous acquisition system was established to measure the acoustic emission (AE) and electromagnetic radiation (EMR) generated during the loading and failure of coal and rock samples. The correlation between the energy of AE and EMR signals and the loading stress of outburst coal-rock samples was studied, and the characteristics of these signals during the loading and fracturing process were analyzed. The results show the feasibility of developing a combined AE and EMR early warning technology to improve the accuracy of early forecasting for coal and gas outbursts.
Article
Engineering, Geological
Kang Peng, Shaowei Shi, Quanle Zou, Zhijie Wen, Yunqiang Wang, Zebiao Jiang, Chunshan Zheng
Summary: Characterizing the failure mechanism of coal and rock materials from the perspective of energy is crucial. The energy evolution of gas-bearing coal has nonlinear characteristics, with total energy mainly stored as elastic energy density. The energy distribution in a stope can be divided into an energy dissipation and release zone, an increasing-energy zone, and a stable energy storage zone.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Jianchun Ou, Enyuan Wang, Zhonghui Li, Nan Li, He Liu, Xinyu Wang
Summary: This experiment investigated the characteristics of various signals during the coal and gas outburst process and found that the acoustic-magnetic-electric precursory signal changes during the adsorption and loading processes can be used to monitor the outburst. This is of great significance for ensuring the safe production and rapid excavation of coal mines.
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)
Review
Energy & Fuels
Chenghao Wang, Yuanping Cheng
Summary: This paper systematically reviews the importance of coal deformation energy and gas expansion energy in coal and gas outbursts. It highlights that most literature related to outburst energy overlooks the contribution of coal deformation energy. Experimental results show that the deformation energy of high outburst risk tectonic coal has a power function relationship with stress, and its releasing mode differs from intact coal. The coal deformation energy is proved to have the same order of magnitude with gas expansion energy.
Article
Thermodynamics
Wei Zhao, Huzi Dong, Kai Wang, Shimin Liu, Zhida Yan
Summary: This study investigates the asynchronous characteristics of gas expansion energy and coal deformation potential energy during coal and gas outburst. The findings reveal that the adsorption-induced expansion process lasts longer, resulting in the asynchronous propagation of gas expansion energy and coal deformation potential energy. The study also uncovers the different components of coal deformation potential energy and their role in the outburst process.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
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
Chemistry, Multidisciplinary
Chengwu Li, Heng Zhang, Min Hao, Xiaoqi Sun
Summary: Coal and gas outbursts in coal mines pose serious safety hazards, with gas release playing a crucial role in these disasters. Research findings suggest that during gas release, coal particles are ejected at high speed, leading to crushing into smaller particles. A new coal particle fragmentation index based on crushing work and energy theory has been developed to predict coal sample crushing situation more accurately and flexibly.
Article
Energy & Fuels
Yanlu Ding, Zhongqi Quentin Yue
Summary: This study designs a tunnel outburst simulator to quantify the characteristics of outbursts in deep tunnels. The study finds that the amplitudes of shock waves induced by outbursts are much higher than those induced by pure gas eruptions, and shock waves caused by compressed air occur before those caused by gas-coal mixtures. The study also observes trajectory segregation of coal deposition and larger coal particles moving further during outbursts. Additionally, the major energy contributing to outbursts comes from the expansion energy of high-pressure CO2 gas.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Energy & Fuels
Haijun Guo, Yingjie Yu, Kai Wang, Zhe Yang, Liang Wang, Chao Xu
Summary: The basic physical parameters and gas desorption characteristics of raw coal and tectonic coal composite seams in northern China were tested and analyzed. The results revealed that the tectonic coal had higher adsorption capacity and gas desorption volume, as well as a higher diffusion coefficient compared to raw coal. However, the Protodyakonov's coefficient of tectonic coal was smaller. This study provides important insights for the prevention and control of coal and gas outburst disasters in raw coal and tectonic coal seams, ensuring the safe and efficient mining of coal resources.
Article
Energy & Fuels
Aitao Zhou, Jiaying Hu, Weili Gong, Kai Wang, Nan Deng, Junchao Wu
Summary: Coal is a natural pore-fracture dual medium, with gas migration affecting the mechanical damage properties of coal and the occurrence of coal-gas outburst. The occurrence of outburst is accompanied by instantaneous displacement mutation of gas-bearing coal, which is difficult to explain. A progressive failure and outburst hypothesis model based on strength reduction theory is proposed for outburst prevention and control.
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
Qingyi Tu, Sheng Xue, Yuanping Cheng, Wei Zhang, Gaofeng Shi, Guisheng Zhang
Summary: This study analyzed the guiding effect of tectonic coal on outburst by combining typical cases and conducting physical simulation experiments. It was found that the threshold value of critical gas pressure for outburst was lower in groups with local existence of tectonic coal areas. Additionally, the outburst development sequence was altered due to the presence of tectonic coal areas.
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
Engineering, Chemical
Dongling Sun, Jie Cao, Linchao Dai, Rifu Li, Yanbao Liu
Summary: The coal and gas outburst shock wave is a high-pressure and high-speed impact airflow formed rapidly after the outburst, which destroys the ventilation facilities and causes the destruction of the ventilation system. This paper theoretically analyzes the microscopic formation process of the outburst shock wave by drawing on the shock wave theory. The paper derives the calculation formulas for the pressure, density, temperature, and other parameters before and after the outburst shock wave, and proposes concepts like the equivalent sound velocity of the coal-gas flow.
Article
Chemistry, Physical
Yawen Li, Hui Liu, Kai Pan, Xiaoqing Gou, Kai Zhou, Danni Shao, Yi Qi, Qi Gao, Yi Yu, Jiaxin Tian
Summary: In this study, four ionic liquids were used to treat FeS, the main component of sulfur corrosion products, in order to explore their inhibition effect on the pyrophoricity. The microstructure of the samples was characterized by a scanning electron microscope, and the spontaneous combustion process and specific heat capacity changes were analyzed. The results showed that the ionic liquids had different degrees of inhibition effect, with [BMIM][I] having the most significant effect.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Dong Ye, Shujie Gao, Yaolin Wang, Xiaoxiang Wang, Xin Liu, Hui Liu, Haining Wang
Summary: The study investigated the morphological effects of MnOx-CeOx adsorbents on their Hg0 elimination performance. The sample with a virgin nanorod microtopography performed significantly better than the nanocube-containing counterparts, maintaining a Hg0 removal efficiency of -97% in the entire temperature range. The microstructure of virgin nanorods possessed a high specific surface area, promoting the interactions between Hg0 and adsorbent surface active sites.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
Hui Liu, Xiaoqing Gou, Kai Pan, Rui Huang, Zhihui Lang, Dong Ye, Xin Wang, Haining Wang
Summary: This study investigated the inhibition effect of four ionic liquids on the spontaneous combustion of iron sulfide. The results showed that the treatment with ionic liquids increased the surface roughness and proportion of fine particles of the iron sulfide samples. The ionic liquids enhanced the reaction onset temperatures and delayed the temperature of maximum mass loss rate during oxidative spontaneous combustion.
Article
Engineering, Chemical
Ya-Nan Yang, Hui Liu, Li-Tao Zhu, Jie Jin, Xi-Bao Zhang, Zheng-Hong Luo
Summary: Multizone circulating reactor (MZCR) technology is an advanced olefin polymerization process that enables the production of polyolefins with varying properties. This study proposes a multimodel coupling method to understand the gas-phase propylene polymerization in a MZCR. The developed model considers the molecular and particle properties of polypropylene and examines key operating variables related to product properties. The simulation results show that the MZCR technology allows for a wide range of polymer properties.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Metallurgy & Metallurgical Engineering
Jie Kong, Wen-jiao You, Zhi-sheng Xu, Hui Liu
Summary: This paper conducts a series of numerical simulations using the fire dynamics simulator (FDS) to study fire in a train carriage. The study aims to investigate the influence of fire source locations and windows breakage on fire spreading. Four ignition source locations were considered, and the window rupture trigger temperature was set at 400 degrees C. Parameters such as temperature, heat release rate, window breakage time, and flame propagation were monitored. The study found that fire source locations and window breakage affect fire development by altering the fresh air supply in the carriage. Improved fire detection, alarm systems, and fire fighting and emergency capabilities are important for enhancing the safety of train carriages.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Green & Sustainable Science & Technology
Ze Wei, Hui Liu, Xuewen Tao, Kai Pan, Rui Huang, Wenjing Ji, Jianhai Wang
Summary: Machine learning has great potential in industrial risk assessment, with three stages of development and three research hotspots. With the establishment of basic theories and structural systems, there are numerous research directions and extensive frontier branches in this field.
Article
Engineering, Chemical
Jihong Ye, Rui Huang, Xin Wang, Qifu Bao, Jie Mu, Kai Pan, Wenjing Ji, Ze Wei, Hui Liu
Summary: Ionic liquids have unique properties of nontoxicity, low contamination, and high efficiency in metal corrosion inhibition, which have received much attention. Through systematic bibliometric analysis and visualization technology, it was found that Asian countries, led by China, are the main research force in this field. Materials science, applied physics, and applied chemistry are the core disciplines, and the Journal of Molecular Liquids, Corrosion Science, Electrochim Acta, and Industrial & Engineering Chemistry Research are the core journals. Research topics in this field include electrochemistry, molecular simulation, and electrolyte solutions, which have become the frontier of ionic liquid corrosion inhibition research.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Senyuan Wang, Dong Ye, Xin Liu, Haining Wang, Wei Ma, Hui Liu
Summary: A series of Mn-Cr mixed oxide adsorbents were synthesized using co-precipitation method. The effects of Mn/Cr molar ratio, reaction temperature, calcination temperature, initial mercury concentration, and flue gas constituents on mercury removal were investigated. MnCr1:3 with an optimal Mn/Cr molar ratio showed the highest efficiency (>95.4%) in a wide temperature range (100-250 degrees C) for mercury removal. The physicochemical properties and mechanism were characterized using various techniques. MnCr1:3 facilitated mercury removal due to its larger surface area, smaller crystallite sizes, higher acidity, and redox properties. Sulfur dioxide promoted elemental mercury capture for MnCr1:3. After five regeneration cycles, MnCr1:3 maintained a relative activity of 100%. The combined effect of manganese and chromium resulted in an increase in high valence metal elements and surface adsorbed oxygen, which played a vital role in mercury removal.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Public, Environmental & Occupational Health
Kai Pan, Hui Liu, Zhijun Wang, Wenjing Ji, Jianhai Wang, Rui Huang, Ze Wei, Dong Ye, Chang Xu, Haining Wang
Summary: Research on ionic liquids in flame retardancy is multidisciplinary, with hotspots including the improvement and application of pure ionic liquid electrolytes, the study of gel polymer electrolytes, the use of ionic liquids to enhance the flame retardancy properties of polymer materials, the synergy of ionic liquids and inorganic materials in flame retardant polymers, and the use of ionic liquids as flame retardants to improve material properties. The research frontiers and future trends involve the combination of computational quantum chemistry to study the flame retardancy mechanism of ionic liquids, the study of fluorinated electrolytes, the use of ionic liquids for smoke suppression, the study of phosphorus-containing ionic liquids as flame retardants, and machine learning-assisted design of ionic liquids flame retardants.
Article
Energy & Fuels
Kai Pan, Hui Liu, Zhihui Lang, Rui Huang, Ze Wei, Wenjing Ji, Jianhai Wang, Dong Ye, Haining Wang
Summary: This study focuses on the influence of mixtures of FeS and FeS2 on the pyrophoricity of ironic sulfide. The results show that FeS, with its unstable molecular configuration and uneven surface morphology, is more prone to spontaneous combustion than FeS2. As the proportion of FeS2 in the sample increases, its activation energy increases and pyrophoricity weakens, but when the proportion reaches a certain level, it promotes the sample's pyrophoricity.
Article
Engineering, Chemical
Jihong Ye, Rui Huang, Xin Wang, Qifu Bao, Jie Mu, Kai Pan, Wenjing Ji, Ze Wei, Hui Liu
Summary: Ionic liquids have attracted much attention in metal corrosion inhibition due to their unique properties. A systematic bibliometric analysis and visualization technology were used to understand the current research progress in corrosion inhibition. The results showed that Asian countries, led by China, were the central research force in the field of ionic liquid corrosion inhibition. Materials science, applied physics, and applied chemistry were the core disciplines, and specific journals were identified as the core journals in this field. The research topics in this field were divided into five timelines, representing different research directions, and electrochemistry, molecular simulation, and electrolyte solutions were identified as the frontier areas.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Environmental Sciences
Rui Huang, Hui Liu, Ze Wei, Yi Jiang, Kai Pan, Xin Wang, Jie Kong
Summary: Ionic liquids (ILs), as a new type of green material, have great prospects in environmental protection and sustainability. This study analyzed 4139 literature published in the WOS database from 2002 to 2022 to understand the role of quantitative structure-activity relationship (QSAR) in IL research. The analysis included bibliometric analysis, knowledge mapping, and analysis of research hotspots. The results showed that the research areas included IL toxicological properties, environmental protection, IL design, and corrosion inhibition. The current research hotspots focused on IL properties, corrosion inhibition, toxicity to the environment, QSAR modeling, IL solvent applications, and drug design.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Dong Ye, Shujie Gao, Zhichang Jiang, Xiaoxiang Wang, Yaolin Wang, Hui Liu, Haining Wang
Summary: This study investigated the influence of synthesis methods on the Hg-0 elimination ability of CrOx adsorbents. The adsorbent prepared using the sol-gel method (Cr(S)) showed the highest efficiency in capturing Hg0, with a removal rate of over 88% at 150 and 200 degrees C, and even reaching about 97% at 250 degrees C during the 5-hour process. The presence of abundant surface acid sites facilitated the adsorption of Hg-0, while increased oxidizability accelerated the oxidation of Hg0, contributing to the satisfactory Hg-0 capture capability of Cr(S). The Mars-Maessen mechanism explained the dominant chemisorption process with Cr6+ and O-alpha as active sites and the formation of HgO as the final oxidation product.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Review
Engineering, Multidisciplinary
Dong Ye, Xiao-xiang Wang, Run-xian Wang, Xin Liu, Hui Liu, Hai-ning Wang
Summary: Mercury emission is an environmental concern due to its high toxicity, bioaccumulation, and persistence. This review summarizes the advances in the application of CuO-based materials for Hg-0 capture and discusses the simultaneous removal of other air pollutants. The study concludes that new adsorbents suitable for long-term operation in coal-fired flue gas should be developed to effectively reduce mercury emissions.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2022)
Article
Public, Environmental & Occupational Health
Jie Kong, Wenjiao You, Zhisheng Xu, Hui Liu, Haihang Li
Summary: In this study, a series of tunnel fire models were developed using the fire dynamics simulator (FDS) to investigate the effect of tunnel slope on hot gas movement and smoke distribution. The results showed that the relationship between smoke back-layering length and tunnel slope can be described by an exponential function. The smoke temperature at the downstream exit initially increased and then decreased with a higher slope. Furthermore, the airflow velocity at the downstream outlet increased nonlinearity when the tunnel slope was less than 8%.
JOURNAL OF SAFETY SCIENCE AND RESILIENCE
(2022)
