Article
Energy & Fuels
Qingdong Qu, Rao Balusu, Bharath Belle
Summary: This article investigates the issue of gas emission in longwall coal mines in the Bowen Basin of Australia. Through measurements of different coal seams, it was found that conventional models often underestimate gas emissions, particularly in coal seams distant from the mining seam. In conclusion, a new model was developed for predicting gas emission from roof coal seams.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
C. Ozgen Karacan
Summary: Coal mine methane emissions pose safety and environmental concerns. This study focuses on a longwall mine in Virginia, USA, extracting metallurgical coal, and presents a comprehensive analysis and modeling to predict emissions. The results show that pre-mining degasification and closer spacing of drilling horizontal wells can significantly reduce ventilation and gob emissions during coal mining.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Environmental Sciences
Sunny Rao, Devi Prasad Mishra, Aishwarya Mishra
Summary: Computational fluid dynamics (CFD) simulations were conducted on a longwall panel in a methane-rich inclined coal seam of the Moonidih mine in India. The study found that ventilation parameters significantly influence methane flow in the longwall tailgate and goaf. Methane accumulation on the rise side wall of the tailgate was attributed to geo-mining parameters, and the turbulent energy cascade impacted methane dispersion along the tailgate. Increasing the inlet air velocity decreased methane concentration in the tailgate outlet but increased oxygen ingress into the goaf, expanding the explosive zone. This study highlights the importance of novel strategies to mitigate methane hazard in U-type longwall mine ventilation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Phu Minh Vuong Nguyen, Andrzej Walentek, Krystian Wierzbinski, Marian Zmarzly
Summary: This article presents a methodology for predicting the absolute methane emission rate for longwall caving extraction based on numerical modeling. The accuracy and reliability of the proposed methodology were evaluated through comparative analysis of all results.
Article
Engineering, Environmental
Dong Ma, Botao Qin, Yuan Gao, Jianan Jiang, Baochao Feng
Summary: This study focused on investigating methane migration induced by coal spontaneous combustion using a self-designed experimental platform, analyzing the effects of temperature and range of spontaneous combustion on methane distribution, and quantitatively identifying potential areas subject to methane explosions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Geological
Jian Wang, Keming Yang, Xiangping Wei, Xiaoyu Shi, Shuyi Yao
Summary: This study analyzed the flaws of the optimized segmented Knothe time function and proposed the Gompertz time function for predicting longwall progressive subsidence basin with improved accuracy. By conducting experiments, it was demonstrated that the Gompertz time function outperforms the traditional method, achieving centimeter-level accuracy and meeting practical engineering requirements.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Deniz Tuncay, Ihsan Berk Tulu, Ted Klemetti
Summary: Accurately estimating load distributions and ground responses around underground openings is crucial for the safety of operations in underground mines. Various methods, including numerical modeling, can be used to approximate mining-induced loads in stratified rock masses. In this study, a 3D modeling approach was successfully applied to a longwall panel to assess its loading conditions and deformations, showing good agreement with field measurements.
MINING METALLURGY & EXPLORATION
(2021)
Article
Energy & Fuels
Cun Zhang, Qingsheng Bai, Chuanqi Zhu
Summary: This paper presents a goaf gradation model (GGM) to describe the particle size distributions of caving zones. The model does not include fitting coefficients and requires relatively few parameters, which facilitates its use. Furthermore, the GGM can match gradation distributions at both the engineering and laboratory scales.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Environmental
H. G. Siegel, M. A. Soriano, C. J. Clark, N. P. Johnson, H. G. Wulsin, N. C. Deziel, D. L. Plata, T. H. Darrah, J. E. Saiers
Summary: Domestic wells in the northern Appalachian Basin serve as the primary drinking-water source for rural residents, but limited understanding of contaminant distributions in groundwater sources exists. This study investigates water quality in the western NAB and identifies key agents influencing contaminant distributions. The results highlight high concentrations of arsenic and nitrate above federal standards and manganese above health advisory levels in some samples. Surface-related impacts from agricultural activities and road salting are found to affect groundwater sources in upland regions, while mixing with basin brines is possible in valley regions. Arsenic impairments are observed in alkaline groundwaters and low-oxygen metal-rich groundwaters. Mine discharge-like waters were also found to mix with groundwater near coal mining operations. The study provides valuable insights into groundwater impairment in an understudied region and presents an integrated approach applicable to other resource extraction areas.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Mining & Mineral Processing
Piotr Ostrogorski, Przemyslaw Skotniczny, Mariusz Pucka
Summary: This article presents the research results on changes in methane concentration in longwall areas in mines. The study experimentally determined the trends of methane concentration along the excavations, and evaluated the pros and cons of the method used.
ARCHIVES OF MINING SCIENCES
(2022)
Article
Metallurgy & Metallurgical Engineering
Aditya Juganda, Claire Strebinger, Jurgen F. Brune, Gregory E. Jr Jr Bogin
Summary: Methane gas explosions pose a major risk in underground coal mining, potentially causing significant loss of life and damage to mine infrastructure. Computational fluid dynamics modeling can help assess the potential damage and study the impact of methane gas explosions on mine ventilation.
MINING METALLURGY & EXPLORATION
(2022)
Article
Energy & Fuels
C. Ozgen Karacan
Summary: The dynamic properties of coal seams play a crucial role in the success of gas production and CO2-enhanced gas recovery. Predicting the distribution and evolution of these properties during production or injection operations can be important for field development and project economics. In this study, the dynamic properties of the Black Creek coal seam in Alabama were mapped using production history matching and geostatistics, showing similar patterns and global distributions despite some local discrepancies.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Ata Ramazani Rend, Samet Can Ozer, Olgun Esen, Anil Soylu, Samed Bozdogan, Abdullah Fisne
Summary: This study develops basin-specific emission factors and investigates methane emissions from Turkey's Zonguldak Coal Basin. It finds that methane emissions are primarily influenced by coal production and mining depth, and utilizing methane mitigation technologies can significantly reduce emissions. The study provides important data for accurate regional representation and guides emission reduction strategies.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Metallurgy & Metallurgical Engineering
A. Juganda, H. Pinheiro, F. Wilson, N. Sandoval, G. E. Bogin, J. F. Brune
Summary: This research project developed a CFD model and an optically accessible model to evaluate methane explosion hazards in longwall coal mines. The CFD model assisted in the design of the physical model and helped identify key locations for sensor placement. The findings of this research will aid in the development of methane monitoring strategies to prevent ignitions and explosions in longwall coal operations.
MINING METALLURGY & EXPLORATION
(2022)
Article
Environmental Sciences
Junlian Gao, Chenghe Guan, Bo Zhang, Ke Li
Summary: A study on China's coal mine methane (CMM) emissions between 2010 and 2019 revealed that the annual emissions were estimated at 20.11 Tg with a decline trend. Factors such as the growth of CMM utilization, shift to lower-emission coal mining areas, and decrease of emission factors contributed to curbing the increasing trend of China's CMM emissions since 2012.
ENVIRONMENTAL RESEARCH LETTERS
(2021)