Article
Engineering, Environmental
Bisham McCarthy-Singh, Alberto Gambaruto
Summary: This study examines the design of electric valve actuators for explosion-proof hazardous environments and investigates the complex combustion effects caused by irregular geometries in the design process, leading to pressure piling. By developing a numerical method using OpenFOAM and conducting experiments to validate the results, this research aims to improve design techniques for controlling over-pressures generated by internal geometries.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Jitao Cai, Jiansong Wu, Shuaiqi Yuan, Zhe Liu, Desheng Kong
Summary: A gas drainage pipeline leakage and diffusion model based on multiple factors was proposed and verified with field measurement data. Results showed that the location, size, and diameter of the leakage accident can affect its characteristics in different scenarios.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Geological
D. de Lucia, N. L. Fazio, P. Lollino
Summary: This study proposes advancements in evaluating the effects of dynamic loads on the stability of calcarenite underground cavities. The research finds that dynamic loads can cause instability effects in the caves, depending on the cavity width, roof thickness, and energy content of the dynamic input.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Civil
M. D. Goel, Vani Jagrit, Sandeep Panchal
Summary: In this study, finite element analysis is used to analyze the behavior of an underground structure subjected to internal blast loading surrounded by soil. Different blast modeling methods are compared, and the effect of explosive weight and concrete grade on the stability of the structure is investigated. The results show that changes in explosive weight and concrete grade have a significant impact on the structure's stability.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Multidisciplinary Sciences
Ashok Kumar Godugu, Sreenath Sekhar, John Loui Porathur, Shubham Bhargava
Summary: A methodology utilizing three-dimensional elasto-plastic analysis has been developed to evaluate the required strength parameters for a stable backfill wall in different dimensions of a stope. The numerical modelling results show varying trends for required backfill cohesion based on stope height, and highlight the limitations of a popular theoretical equation in representing interface friction and tension. This methodology has been successfully implemented in over 50 stopes in a hard rock mine in North India.
Article
Energy & Fuels
Amir Ehsan Kianfar, Mrityunjaya Sherikar, Andre Gilerson, Marcin Skora, Krzysztof Stankiewicz, Rudrajit Mitra, Elisabeth Clausen
Summary: This paper describes the goal of the EU-funded HEETII project, which aims to improve work safety in underground mines by introducing a single-wire energy transmission system and a wireless monitoring system. It also discusses the design of electrical systems in potentially explosive atmospheres.
Article
Multidisciplinary Sciences
Mohammad Javad Rahimdel, Behzad Ghodrati
Summary: Using the Markov modeling approach, this study analyzed the reliability of a compressed air system in Qaleh-Zari Copper Mine, Iran. The results showed that there is a 31.5% probability of the compressed air supplying system being in operating condition with two main and one standby compressors. The system probability of two main compressors remaining in operation without failure for one month is 92.32%. Furthermore, the estimated lifetime of the system when at least one main compressor is active is 33 months.
SCIENTIFIC REPORTS
(2023)
Article
Metallurgy & Metallurgical Engineering
Juan Diaz, Zach Agioutantis, Dionissios T. Hristopulos, Steven Schafrik, Kray Luxbacher
Summary: This research aims to develop a forecasting methodology for methane gas emissions in underground coal mines based on time series analysis. Statistical methods are used to investigate the autocorrelations of methane gas and its association with barometric pressure and coal production. The study shows that the ARIMA model used in one-step-ahead forecasting provides accurate estimates that match the direction of methane gas emission data.
MINING METALLURGY & EXPLORATION
(2022)
Article
Chemistry, Multidisciplinary
Peng Jiang, Yong Tian, Bo Wang, Chaohong Guo
Summary: In this study, a numerical model for the cooling of a supercritical carbon dioxide turbine rotor was established and the effects of inlet temperature, flow rate, and leakage flow rate on rotor cooling were studied. The results showed that an increase in the inlet flow rate and leakage flow rate led to an increase in the pressure difference between the inlet and outlet of each seal gas, while an increase in the inlet temperature resulted in a decrease in the pressure difference.
Article
Engineering, Electrical & Electronic
R. Guizan, I. Colominas, J. Paris, I. Couceiro, F. Navarrina
Summary: This paper presents a mathematical and numerical approach to design and analyze grounding systems in underground electrical substations based on Maxwell's Equations and the Boundary Element Method. The proposed formulation allows for a more realistic approximation of soil structure and the computation of key parameters and voltage distributions. The analysis of real underground electrical substations demonstrates the industrial application and modeling capabilities of the approach.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Engineering, Chemical
Paul Prasanna Kumar, Partha Sarathi Paul, Manjunath Ananda
Summary: This study aims to develop an Underground Gas Monitoring Device using LoRa communication for the effective transmission of monitored data. The testing was carried out in an underground mine model and the system performed well in both line of sight and non-line of sight situations. However, it was observed that for non-line of sight, the signal dropped at 14 meters and no signal was received beyond 17 meters, indicating the need for boosters every 15 meters for efficient signal propagation. The developed system triggers alarms in the underground, boosters, and on the surface when the gas level exceeds the threshold limit in the underground mine.
Article
Engineering, Chemical
Hao Jin, Shihang Li, Hesheng Yu, Liang Yuan, Fubao Zhou, Zhongchao Tan
Summary: This paper focuses on the filtration and loading characteristics of dust particles in underground coal mines using fibrous surface filters. A new analytical model based on the single particle filtration theory was developed and validated in laboratory settings. The model was then simplified using the median particle size of polydisperse particles and further validated in an underground coal mine. Overall, this study provides a practical tool to predict the filtration efficiencies of fiber surface filters in underground coal mines.
Article
Geochemistry & Geophysics
Qingliang Chang, Xingjie Yao, Xiangyu Wang, Sen Yang, Yuantian Sun
Summary: This paper explores the critical role of hydraulic fracturing in reducing coal pillar pressure, providing practical methods for application in coal mine working faces and verifying the effectiveness through experimentation.
Article
Engineering, Environmental
Juan Diaz, Zach Agioutantis, Dionissios T. Hristopulos, Kray Luxbacher, Steven Schafrik
Summary: Mining operations provide coal for 36% or more of the global electricity demand. With methane gas being released during coal mining posing significant risks to miners, early warning systems for rising methane gas concentrations are crucial. This paper introduces a new forecasting approach for methane gas emissions in underground coal mines, utilizing univariate and multivariate time series forecasting methods. The performance of three methods (ARIMA, VAR, ARIMAX) is compared, with the conclusion that all three methods can satisfactorily predict methane gas concentrations in most cases.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2023)
Article
Engineering, Environmental
Baiwei Lei, Chenguang Zhao, Zidong Zhao, Bing Wu, Guang Xu
Summary: This study proposes a method to remotely evaluate the damage status in underground mines after a mine accident using tracer gas and Gaussian Mixture Model (GMM) decomposed by the expectation-maximization (EM) algorithm. The results show a small error in calculated damage location, and the area ratio of the concentration curve after decomposition by the EM algorithm is highly correlated with the severity of airway damage.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Thermodynamics
Sait Kizgut, Mehmet Bilen, Ihsan Toroglu, Kemal Baris
COMBUSTION SCIENCE AND TECHNOLOGY
(2016)
Article
Energy & Fuels
Mehmet Bilen, Sait Kizgut, Serdar Yilmaz, Kemal Baris, Dilek Cuhadaroglu
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2018)
Article
Energy & Fuels
K. Baris, C. Keles, N. Ripepi, K. Luxbacher, S. Gurpinar, M. Karmis
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
(2016)
Article
Thermodynamics
K. Baris, H. Aydin, V. Didari
COMBUSTION SCIENCE AND TECHNOLOGY
(2011)
Article
Energy & Fuels
K. Baris, A. Ozarslan, N. Sahin
ENERGY EXPLORATION & EXPLOITATION
(2008)
Article
Economics
Serhat Kucukali, Kemal Baris
Article
Economics
Serhat Kucukali, Kemal Baris
Article
Economics
Kemal Baris
Article
Economics
Kemal Baris, Serhat Kucukali
Article
Energy & Fuels
K. Baris, S. Kizgut, V. Didari
Article
Green & Sustainable Science & Technology
K. Baris
ENERGY FOR SUSTAINABLE DEVELOPMENT
(2013)
Article
Energy & Fuels
Kemal Baris, Yusuf Aydin
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
(2020)
Article
Thermodynamics
S. Kizgut, K. Baris, S. Yilmaz
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2006)