Article
Energy & Fuels
Leilei Si, Yujun Xi, Jianping Wei, Bo Li, Hongyang Wang, Banghua Yao, Yong Liu
Summary: This study proposed a new method for measuring gas pressure based on gas solubility in order to determine the gas pressure for water-intrusion boreholes. Through laboratory experiments and field tests, the composition of mine water, gas solubility in mine water, and gas dissolved amount in borehole water over time were investigated, leading to the proposal of a new method and equipment for testing gas pressure in coal mines. The research results provide new insights for measuring gas pressure in water-intrusion coal seam.
Article
Engineering, Environmental
Ke Gao, Shengnan Li, Yujiao Liu, Jinzhang Jia, Xiaoqi Wang
Summary: This study investigated the impacts of flexible obstacles on gas explosion propagation in tunnels using numerical simulation models. It was found that flexible obstacles significantly affected the flame propagation law, causing wrinkles in the flame shape and changing maximum pressure and flame propagation speed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Automation & Control Systems
Shijia Wang, Shibo Wang
Summary: This paper introduces a method using UWB radar imaging to measure the longwall retreat and creep displacements. The method has the capability of all-day, all-weather imaging, and scans bolt plates in the roadway by moving the radar along a slide-way mounted on the head of armored face conveyor. The measurement errors of this method are less than 10 mm.
IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Hongyan Lei, Linchao Dai, Jie Cao, Rifu Li, Bo Wang
Summary: In order to address the problems of heavy work, long cycle, high cost and low efficiency in indirectly determining coal seam gas content, this study measured the basic gas parameters and coal quality indexes of 24 coal samples from 5 coal mines in the Hancheng area of Shanxi Province using laboratory measurement methods. A logarithmic function model was established to characterize the relationship between the gas content-gas desorption index of drilling cuttings (W-K-1). Statistical analysis using SPSS software showed that the gas adsorption constant (a), apparent density (ARD), initial velocity of gas diffusion (Delta p), and consistent coefficient (f) significantly influenced the regression slope C in the W-K-1 relationship model. The regression constant D was significantly affected by Delta p and atmospheric adsorption (Q). A mathematical model for rapid prediction of coal seam gas content was then determined, with an average absolute error rate of 12.84% when compared to measured values. This method provides a simple and feasible approach for rapid determination of coal seam gas content in coal mines in the Hancheng area.
Article
Engineering, Environmental
Peng Liu, Jinyang Fan, Deyi Jiang, Jiajun Li
Summary: Underground gas extraction from coal formations has triple-effects involving mining safety, low-carbon gas capture, and greenhouse gas control; Air leakage around the drainage borehole is a serious issue affecting gas drainage performance; Controlling the permeability around the borehole and coal matrix parameters can improve gas drainage efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Industrial
Wanguan Qiao
Summary: This paper explores the mechanism of multifactor risk in underground coal mine accidents and proposes a multifactor risk measurement model based on coupling theory. The results show that risk coupling has a significant impact on the occurrence of coal mine accidents.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Environmental Sciences
Xin Yang, Xiaohu Lin, Wanqiang Yao, Hongwei Ma, Junliang Zheng, Bolin Ma
Summary: This paper proposes a robust LiDAR SLAM method that detects and compensates for degenerated scenes by integrating LiDAR and IMU data, and implements a globally consistent LiDAR SLAM. Experimental results show that the proposed method achieves better robustness than LeGO-LOAM and LIO-SAM. The absolute position RMSE is only 0.161 m, providing an important reference for underground autonomous localization and navigation in intelligent mining.
Article
Energy & Fuels
Yi Lu, Min Li, Deming Wang, Xingyu Shi, He Li, Yunfei Zhu, Qing Ye, Jiexin Lu
Summary: Electric effects are generated during the deformation and fracture of coal mine roof sandstones, which can potentially lead to gas explosions. The compressive strength of the rock plays a key role in the instantaneous discharge process.
Article
Energy & Fuels
Minghao Yi, Liang Wang, Yuanping Cheng, Chenghao Wang, Biao Hu
Summary: This study investigated the effects of equilibrium pressure and desorption time on gas diffusion in coal particles. The results showed that both the decrease of gas equilibrium pressure and the extension of desorption time led to a decrease in the diffusion coefficient. Additionally, the adsorbed gas had a significant effect on gas diffusion, and the diffusion coefficient in the free gas system was overestimated.
Article
Energy & Fuels
Zhaolong Ge, Shihui Gong, Zhe Zhou, Maolin Ye, Zepeng Wang, Hui Zhang, Chengtian Li, Hongwei Zhang
Summary: Ecofriendly viscoelastic surfactant fracturing fluids can effectively modify coal fractures and improve their flow capacity. In this study, three different VESFFs were used to modify coal fractures and their effects on flow characteristics were analyzed. The results showed that the cationic surfactant fracturing fluid had the most significant improvement on flow capacity. A new friction factor model was proposed to describe the gas flow characteristics.
Article
Energy & Fuels
Aitao Zhou, Zhiyuan Xu, Kai Wang, Yanhai Wang, Jingyu An, Zhan Shi
Summary: Gas drainage is a key measure to prevent coal and gas disasters. This study combines numerical simulation and field experiment to optimize the extraction parameters of intubation spacing and extraction negative pressure in Buertai Coal Mine. A three-dimensional gas distribution model is established and COMSOL software is used for calculation. The results show that ideal gas drainage effect can be achieved at a negative pressure of 12-18 kPa within the range of 50 m-70 m.
Article
Chemistry, Multidisciplinary
Ya-nan Wang, De-ming Wang, Hai-hui Xin, Yun-fei Zhu, Zhenhai Hou, Wei Zhang, Min Li
Summary: Existing studies on coal self-ignition and impact frictional sparks do not fully support the analysis of ignition sources in all cases of methane explosions in the gob. This paper investigates the piezoelectric effect and ignition characteristics of roof collapse in the Renlou coal mine to identify a new ignition source of gas explosion. The experimental and theoretical analyses reveal that the piezoelectric effect and compressive strength of the rock are key factors in generating electrical sparks, which serve as the ignition source in the explosion at the Renlou mine II7322.
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
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
Chemistry, Multidisciplinary
Liang Du, Xuchao Huang, Zhengshuai Wang, Chuanjian Cheng, Kuwanixibieke Maimaitizhuma, Haichao Wang, Zhenzhi Wang, Zhiwei Zeng, Bing Luo, Mengmeng Yang, Zheyuan Ouyang, Wei Dou, Beixi Zhang, Teng Li
Summary: This study investigates the impact of coal body structures and rock composition on the desorption characteristics of coalbed methane (CBM). The results show that the reflectance of vitrinite and pore characteristics have significant effects on the desorption volume and ratio. These findings can help guide the management of coal mine gas and CBM development in middle-and low-rank coal reservoirs in Xinjiang.
Article
Energy & Fuels
Bin Shi, Yunxing Cao, Lin Tian, Junsheng Zhang, Shimin Liu
Summary: This study conducted a CO2 gas fracturing (CO2-Frac) experiment in an area with steeply inclined multicoal seam formations. The results showed that using CO2 fracturing in in-seam boreholes and penetration boreholes significantly improved the efficiency of gas drainage. The fractures radius of CO2-Frac in the penetrating borehole was larger than in the in-seam boreholes, which may be related to the developing property of bedding and cleat system in coal seam.
Article
Energy & Fuels
Peng Liu, Ang Liu, Shimin Liu, Lingling Qi
Summary: Effective reservoir stimulation is crucial for enhancing coalbed methane (CBM) recovery, and ultrasound treatment offers a new alternative to traditional hydraulic fracturing. This study investigated the alteration of pore/fracture structure in coal with ultrasound treatment and its impact on gas desorption and diffusion behaviors. Results show that ultrasound treatment significantly increases pore volume and interconnectivity in coal, leading to improved gas transport during gas drainage and CBM production.
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
Energy & Fuels
Shaoqing Wang, Hao Chen, Xiaoling Wang, Yuegang Tang, Shimin Liu, Harold H. Schobert, Xiaoxia Song, Fangui Zeng
Summary: The evolution of coals affected by igneous intrusions differs from normal coalification, and is related to geological conditions. By analyzing data, three evolution pathways were identified, with Track I being similar to normal coalification, Track II showing faster dehydrogenation and slower deoxygenation, and Track III displaying anomalously high oxygen content due to the presence of carbonate minerals.
Article
Engineering, Geological
Jiandong Ren, Yixin Zhao, Wen Wang, Jihong Guo, Zhongbo Sun, Shimin Liu
Summary: Currently, the width of the protection coal pillar with the buried pipeline at gas-coal integrated mining area is determined by the horizontal distance between the surface subsidence boundary and the panel (traditional method). However, this method leads to the loss of abundant coal resources. Therefore, an optimal design for the protective coal pillar of the pipeline is proposed by investigating the Gaussian function equation of the surface subsidence curve and analysing the failure probability of the pipeline.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Nathan Gendrue, Shimin Liu, Sekhar Bhattacharyya, Ronald Clister
Summary: In this study, the airflow distribution of a large opening mine with a booster fan was investigated using a CFD model. The results showed that the booster fan is an effective ventilation control for airflow direction and placement significantly influences the pollutants' removal. Additionally, the traditional traverse method may be inadequate for measuring airflow around booster fans, with errors ranging from 35% to 210%. The study provides a foundation for future research on booster fan placement optimization and face ventilation effectiveness.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Editorial Material
Geosciences, Multidisciplinary
Jingshou Liu, Wenlong Ding, Shimin Liu, Kouqi Liu, Dadong Liu
FRONTIERS IN EARTH SCIENCE
(2023)
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
Energy & Fuels
Ang Liu, Shimin Liu
Summary: This study measured and analyzed the sorption and diffusion behaviors of eight coals from major coalfields in the United States. The results showed that all eight coals have considerable hydrogen sorption capacities. The fixed carbon content and O/C ratio are correlated with the maximum hydrogen adsorption capacity in coals. Hydrogen has superior diffusive gas deliverability in coal, making it a promising candidate for hydrogen storage.
Article
Energy & Fuels
Ang Liu, Shimin Liu
Summary: In this study, the gas-water production period in a shale gas reservoir is divided into two stages: gas-water two-phase flow dominates at Stage I, while flows are controlled by desorbed gas and water in the adsorbed phase at Stage II. The evolution models of porosity and permeability consider the swelling strains induced by gas and water sorption. A coupled model of multi-mechanistic gas-water transport behavior in tight shale was proposed and numerically solved. The results provide insights into gas/water transport behavior and water retention behavior in tight shale.
Article
Energy & Fuels
Shuaifang Guo, Yunxing Cao, Junsheng Zhang, Xinsheng Zhang, Bingbing Meng, Shimin Liu
Summary: High-pressure CO2 gas fracturing is a novel technology to improve coal-seam permeability and increase gas extraction efficiency. However, the understanding of the pore-microfracture evolution characteristics and damage mechanism induced by CO2-Frac is still limited.
Article
Engineering, Geological
Ang Liu, Shimin Liu, Kaiwen Xia, Peng Liu, Yun Yang, Gang Wang
Summary: Matrix shrinkage/swelling induced by gas sorption plays a crucial role in coalbed methane reservoir stress depletion and gas transport enhancement. This study used a sorption and matrix shrinkage system to measure the gas sorption capacity and 3-D anisotropic swelling/shrinkage strains simultaneously. The high heterogeneity and anisotropy of coals were confirmed using imaging techniques, and the principal strains were computed through a proposed strain transformation model.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Jinming Zhang, Xiaowei Hou, Shimin Liu, Luwang Chen, Yingjin Wang
Summary: In this study, a new data-driven method, an improved BP neural network model optimized by grey relational analysis (GRA) and particle swarm optimization (PSO) algorithm, was proposed for predicting the accurate evolution of in situ coalbed methane (CBM) content. The results showed that the GRA method helped determine the input parameters for the BP neural network model, improving the operation speed and reducing the influence of redundant parameters. Additionally, the PSO algorithm with asynchronous learning factors successfully optimized the weights and thresholds of the BP neural network, leading to increased modeling accuracy. The proposed model yielded reliable results, outperforming traditional prediction models in terms of prediction accuracy (only 3.71% relative error). It is believed that this model is useful for high accuracy prediction of in situ CBM content in heterogeneous reservoirs under complicated geological structure conditions due to its robustness and generalization.
Article
Energy & Fuels
Chuanwen Sun, Shimin Liu, Shouding Li, Kai Wang, Yiming Sun, Xiao Li, Zhaobin Zhang
Summary: Nano-SiO2 particles can accelerate the formation of tetrahydrofuran hydrate and shorten the induction time, with an optimal mass concentration of 0.5 mg/mL.
Article
Energy & Fuels
Elham Rahimi, Shimin Liu, Meng Wang
Summary: Co-bioconversion of coal and anaerobic digestion sludge is an innovative approach to managing waste materials and producing valuable products such as biogas and biofertilizers. This study investigates the effects of different media combinations on the bioconversion process and finds that the use of formation water and nutrients leads to maximum biogas production in a short period, while mixing coal-sludge with deionized water results in maximum cumulative biogas production over a longer duration.
