Article
Energy & Fuels
Yujin Qin, Kan Jin, Fuchao Tian, Weiwei Su, Shaokui Ren
Summary: Coal and gas outburst, a catastrophic mining hazard, is closely related to igneous intrusion. Ultrathin igneous sill intrusion significantly changes the physical properties of coal, increasing its metamorphic grade and altering its thermal evolution zone. The moisture, ash contents, and gas desorption property of coal can be used as signs for detecting small-scale igneous intrusion and as early warning indicators for outburst prevention.
Article
Green & Sustainable Science & Technology
Jie Zheng, Qinming Liang, Xin Zhang, Jinyong Huang, Wei Yan, Gun Huang, Honglin Liu
Summary: Coal and gas outburst is a pressing problem in coal resource extraction, posing a severe threat to coal mine safety and sustainable production. This study investigates the gas desorption-diffusion behavior of bituminous coal with different particle sizes and its impact on coal breaking during outbursts. The findings reveal that smaller coal blocks have higher gas desorption and diffusion rates, resulting in more rapid coal fragmentation and gas release. These insights contribute significantly to the prevention and control of coal mine disasters and sustainable coal resource production.
Article
Environmental Sciences
Khadijeh Amani, Mehdi Najafi, Ramin Rafiee
Summary: The sudden outburst of coal and gas is a complex and dynamic incident in underground coal mines. This study proposes a novel method to predict the possibility of gas outburst in coal seams by considering ten main variables and using a fuzzy interaction matrix. The proposed method aims to reduce the risks of coal and gas outburst in coal mines.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Kang An, Songwei Shan, Yanfei Zhong, Haidong Chen, Guangwei Xu, Xiangjun Chen, Zhaofeng Wang
Summary: Affected by tectonics, China has widely distributed soft and hard composite coal seams; the stratification of soft layers in these seams plays a key role in controlling coal and gas outburst accidents. To accurately extract the soft layers, a directional hydraulic coal mining equipment, including a drilling rig pump truck system, a directional coal wireless measurement system, and a cutter drill pipe system, has been developed. Mathematical modeling and numerical simulations show that the stress and gas pressure around the borehole significantly decrease after coal extraction. On-site tests demonstrate that directional hydraulic coal extraction can achieve a volume of 0.25 m(3) per meter, with over 3% of the total coal within the coverage area being extracted. The average gas extraction concentration in the coal extraction area is 80.15%, and the net gas extraction from 100 m boreholes reaches 0.17 m(3)/(min & BULL;hm). Directional hydraulic coal mining technology effectively prevents coal and gas outbursts in soft and hard composite coal seams and has promising applications.
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
Green & Sustainable Science & Technology
Feng Zhang, Jinshan Zhang
Summary: This paper presents a study on the mining sequence and gas control technology in Wulan Coal Mine, proposing the method of combined protective layer mining of #7 and #8 coal seams and using surface drilling for pressure-relief gas extraction to protect the #2 and #3 coal seams.
Article
Energy & Fuels
Chaolin Zhang, Enyuan Wang, Jiang Xu, Shoujian Peng
Summary: Coal and gas outbursts in coal mines are serious disasters that threaten safety, with causes that are complex and methods of prediction and prevention still immature. This study conducted experiments to explore effective prediction and prevention measures, developed a new outburst risk assessment method, analyzed different risk levels, and proposed corresponding prevention methods, providing guidance for better preventing outbursts and ensuring safe coal-mine operations.
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
Xin Zhang, Jupeng Tang, Yishan Pan, Honghao Yu
Summary: Coal and gas outburst is a serious dynamic disaster in coal mining. This study explores the characteristics and risk levels, and proposes a new prediction method based on acoustic emission parameters.
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
Engineering, Geological
Majid Khan, He Xueqiu, Song Dazhao, Tian Xianghui, Zhenlei Li, Xue Yarong, Khurram Shahzad Aslam
Summary: This paper investigates the rock mechanical behavior during the excavation of ultra-thick coal mines through seismic data analysis. The results show that the distribution of microseismic events coincides with the increased rock pressure, with high energy events accounting for 57.93% of the microseismic-induced earthquakes. Precursory parameters such as sharp-rise and sharp-drop variations, as well as high deviation in energy and frequency, are identified as early warning indicators for increased rock pressure and fracture development. A comprehensive early warning method and 3D visualization of the fracturing process are proposed, providing accurate insights for disaster prediction and early warning.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Chaojun Fan, Lingjin Xu, Xiang Fu, Lijun Zhou, Sheng Li, Weiwei Su
Summary: Coal is a naturally discontinuous, heterogeneous, and anisotropic brittle material whose uniaxial compressive strength is significantly affected by the sample size-dominated microstructure of minerals and fractures. The scale effect of coal strength is of great significance in explaining the fracturing law of the coal seam and revealing the mechanism of coal and gas outburst disaster. The study tested the uniaxial compressive strength of outburst-prone coal samples with different scales, analyzed the variation law, and constructed mathematical models. The results show that the average compressive strength and elastic modulus decrease exponentially with the increase in scale size.
Article
Green & Sustainable Science & Technology
Zhenzhen Jia, Feng Tao, Qing Ye
Summary: This study analyzes the existing problems of control measures in uncovering coal seams in rock crosscut and investigates the main factors causing coal-gas outburst. The feasibility of using injection liquid freezing to prevent coal-gas outburst is discussed, and it is concluded that this measure has multiple functions and can effectively control coal-gas outburst.
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
Rong Zhang, Yuanping Cheng, Liang Yuan
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2020)
Article
Geochemistry & Geophysics
Kaizhong Zhang, Qingquan Liu, Kan Jin, Liang Wang, Yuanping Cheng, Qingyi Tu
Article
Metallurgy & Metallurgical Engineering
Tian Fu-chao, Liang Yun-tao, Wang De-ming, Jin Kan
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2019)
Article
Energy & Fuels
Zheng Shang, Haifeng Wang, Yuanping Cheng, Bing Li, Jun Dong, Qingquan Liu
Summary: This study examined the effective range, efficiency, cost, and applicable conditions of surface well drilling and net-like penetrating boreholes for pressure-relief gas extraction. The results showed that surface wells have higher gas extraction concentration and purity compared to NPB.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Hao Zhang, Yuanping Cheng, Liang Yuan, Liang Wang, Jingyu Jiang, Guofang Li
Summary: A gas extraction model considering the effects of coal damage on permeability evolution was developed and applied to design a hydraulic cavity scheme for the Shijiazhuang coalmine, with field application results proving the accuracy of the simulation.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Energy & Fuels
Xiangjun Chen, Liyang Li, Yuanping Cheng, Lingling Qi
Summary: This study investigates the influence of water injections on coalbed methane recovery. The results show that the injected water can replace the adsorbed methane, and the replacement ratio and quantity of methane increase with the increasing quantities of injected water. This suggests that water injections can further enhance CBM recovery.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Congmeng Hao, Yuanping Cheng, Hongyong Liu, Liang Wang, Qingquan Liu
Summary: The new technology, assisted by mechanical cutting with waterjet, effectively increases gas drainage efficiency in coal seams and reduces mining costs.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Geosciences, Multidisciplinary
Kaizhong Zhang, Liang Wang, Yuanping Cheng, Wei Li, Jin Kan, Qingyi Tu, Jingyu Jiang
NATURAL RESOURCES RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
Quanlin Yang, Wei Li, Kan Jin
Article
Thermodynamics
Hui Liu, Chenglang Xiang, Jie Mu, Jieyu Yao, Dong Ye, Kan Jin, Zhihui Lang
Summary: This study conducted pyrolysis experiments on oil sludge and found that high heating rates can promote the pyrolysis process. The thermodynamic models for the four oil sludge samples were all 3-D diffusion models. The research provides theoretical support for the industrialization, harmlessness, and resource utilization of oil sludge pyrolysis.
Article
Energy & Fuels
Yujin Qin, Kan Jin, Fuchao Tian, Weiwei Su, Shaokui Ren
Summary: Coal and gas outburst, a catastrophic mining hazard, is closely related to igneous intrusion. Ultrathin igneous sill intrusion significantly changes the physical properties of coal, increasing its metamorphic grade and altering its thermal evolution zone. The moisture, ash contents, and gas desorption property of coal can be used as signs for detecting small-scale igneous intrusion and as early warning indicators for outburst prevention.
Article
Engineering, Multidisciplinary
Kai Zhang, Lu Wang, Jun Liu, Hejun Wu, Xiaomeng Xu, Dongmei Huang, Kan Jin, Jiafeng Liu
Summary: With the rapid development of urbanization and modernization, the demand for electric power is increasing. Establishing a modern safety management system can enhance power enterprises' ability to respond to emergencies. This paper investigates the safety management system of power enterprises and proposes a multi-level evaluation system to assess their safety resilience capacity. A case study validates the feasibility of the proposed model and provides recommendations for improving enterprise safety resilience. This work lays the foundation for building a new power system with new energy sources.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Kan Jin, Gaofan Lin, Qi Zhao, Yajing Liu, Jia Qiu, Yong Jiang, Dongmei Huang
Summary: Gas microleakage in domestic gas appliances can cause gas diffusion and accumulation, leading to indoor gas explosion accidents. This study focused on a integrated stove and used computational fluid dynamics (CFD) numerical simulation to analyze the diffusion and accumulation characteristics of microleakage liquefied petroleum gas (LPG) under different leakage rates and locations. The results showed that microleakage LPG had a downward diffusion flow driven by gravity and the concentration increased with leakage time, but the spatial distribution was uneven. The volume of the dangerous area changed rapidly with the accumulation of microleakage LPG, occupying more than 50% of the cavity volume. The diffusion and accumulation process of microleakage LPG were similar under different leakage rates, but the leakage location had a significant impact on the characteristics. Different leakage locations resulted in different diffusion distributions and accumulation positions of microleakage LPG. The research provides technical support for preventing microleakage gas explosion accidents.
Article
Thermodynamics
Hui Liu, Chenglang Xiang, Rui Hong, Yimeng Song, Kan Jin, Kai Zhu, Chun Yang, Chen Lv
Article
Chemistry, Multidisciplinary
Jun Dong, Yuanping Cheng, Pinkun Guo