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Article
Energy & Fuels
Wei Zhao et al.
Summary: In this study, a software based on the Nelder-Mead simplex algorithm was designed to obtain bidisperse diffusion coefficients and understand the main controlling factors of macroscopic desorption curves. Desorption experiments were conducted to analyze the gas desorption characteristics under different pressures. The results revealed that the apparent diffusion coefficient obtained by the bulk technique showed three different trends with increasing pressure. The conclusions provide theoretical guidance for the selection of rational gas drainage methods for diffusion-controlled coal seams.
Article
Energy & Fuels
Haifei Lin et al.
Summary: The CH4 adsorption-desorption-seepage characteristics of coal are important indicators for measuring the gas extraction capacity of coal seam. The deformation of coal caused by CH4 adsorption-desorption-seepage is a significant factor affecting the CH4 extraction ability. This study conducted synchronous test experiments on CH4 adsorption-desorption-seepage and coal deformation under different gas pressures. It analyzed the timely characteristics of CH4 adsorption-desorption-seepage and coal deformation, clarified the influence of gas pressure, and discussed the quantitative relationship between CH4 adsorption-desorption-seepage and coal deformation. A whole-process strain model of coal for CH4 adsorption-desorption-seepage was established. The research findings showed that increasing gas pressure can promote the CH4 adsorption-desorption-seepage and deformation of coal, and the deformation is affected by coal bedding structure and external stress. The strain caused by CH4 adsorption-desorption-seepage in coal has different growth relationships with the adsorption capacity, desorption capacity, and seepage capacity of CH4. The study provides theoretical support for the efficient extraction of coal seam gas.
Article
Energy & Fuels
Chaoping Xu et al.
Summary: This paper presents a comprehensive analysis of the evolutionary characteristics of the macromolecular structure of coal using X-ray diffraction and Raman spectroscopy. The results show that microwave irradiation triggers the conversion of ordered graphitic carbon to amorphous carbon, as well as the condensation and spatial arrangement of aromatic clusters. Microwave-assisted oxidation facilitates the directional growth of aromatic rings and the cross-linking of aliphatic chains, and induces the rotation, displacement, stacking, and gradual parallel alignment of aromatic lamellae, thereby improving the integrity of the graphite structure and the orderliness of the macromolecular structure.
Article
Energy & Fuels
Jiexin Lu et al.
Summary: This study investigates the effects of microwave heating on the methane adsorption capacity of Pingdingshan bituminous coal. The results show that microwave irradiation can promote methane diffusion from the coal matrix.
Article
Mining & Mineral Processing
He Li et al.
Summary: Microwave heating can facilitate coal fracturing and gas desorption, but it has issues such as low penetration depth, local overheating, and fracture closure. Acid treatment of coal has advantages in unblocking and permeability improvement, but it struggles to enter microcracks. Microwave-assisted acidification may provide an alternative solution.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Gang Wang et al.
Summary: Coal seam water injection is effective in preventing dust pollution and coal mining disasters. However, the quantitative determination of the water injection range is challenging, and there is no effective measurement method available. This study introduces fluorescent tracers commonly used in oil fields into the detection of the wetting area of coal seam water injection. The results show that fluorescein sodium and calcein disodium promote the wetting stage, while FITC inhibits it. Additionally, fluorescein sodium promotes seepage, while calcein disodium and FITC only have an effect at low concentrations. The permeability coefficients of all tracers decrease as the experiment progresses, attributed to the retention effect.
Article
Mechanics
Xinyu Zhu et al.
Summary: This study investigated the fracture damage characteristics of hard roof with different bedding angles under the action of soundless cracking agents (SCAs). The results showed that a bedding angle of 45° had the best cracking effect on the samples, and the fracture was mainly dominated by tensile damage. The cumulative acoustic emission (AE) energy, fractal dimension, and fracture density initially increased and then decreased with an increase in bedding angle. This research is important for understanding the fracture characteristics of the hard roof.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Energy & Fuels
Jiexin Lu et al.
Summary: Microwave-assisted acidification is a promising method for enhancing CBM recovery by improving pore structure and fracture connectivity in coal. It greatly increases pore volume, length, and width of fractures compared to microwave heating or acidification alone. This study demonstrates the significant potential of microwave-assisted acidification for CBM production.
Article
Energy & Fuels
Yi Zhang et al.
Summary: With the continuous advancement of mechanized mining, the presence of dust poses a serious threat to mine production safety and the health of underground workers. Injecting water into coal seams is an effective way to moisten the primary coal dust in the coal body. This study focused on the impact of acid fracturing fluid, used for coal seam water injection, on the wettability and pore structure of coal. The findings suggest that acid fracturing fluid can improve coal's wettability by reducing surface tension, affecting contact angles, and enhancing the hydrophilic functional groups.
Article
Energy & Fuels
He Li et al.
Summary: NMP treatment reduces the saturated adsorption capacity of methane in coal and increases its diffusion capacity. Methane molecules are mainly enriched around hydroxyl and thiophene groups, and NMP treatment reduces their enrichment. This study deepens the understanding of the adsorption and diffusion mechanism of coal methane by NMP treatment from a molecular perspective.
Article
Energy & Fuels
Xi Wu et al.
Summary: This study analyzed the pore structure and surface morphology of coal samples treated with microwave-liquid nitrogen cyclic processing (MLCP). The results showed that MLCP can increase coal reservoir permeability, and the frequency of cycles has a significant impact on pore volume.
Article
Energy & Fuels
Hong Zuo et al.
Summary: The study investigates multiple upscaling schemes for gas transfer in different scales of porous media, including nanoporous media, microporous matrix, core-scale matrix, and centimeter-scale matrix-fracture systems. A parallelized multi-scale numerical solver is developed to simulate micro-gaseous flow in composite microporous media using the pore-scale multiple-relaxation-time lattice Boltzmann method (MRT-LBM) and representative elementary volume (REV)-scale LBM model. The study also examines the variations of permeability with the spatial distribution of different constituents in tight shale formations and reveals new insights on gas transfer processes in these formations.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Zheng Wang et al.
Summary: "Organic solvent erosion is an efficient method to promote fracture and pore development in coal. The effects of different solvents vary depending on their extraction rates on coal."
Article
Energy & Fuels
He Li et al.
Summary: This paper introduces the concept of using microwave-assisted oxidation to enhance the permeability of coalbed methane (CBM) reservoirs. The study shows that microwave-assisted oxidation can change the physicochemical structure of coal and improve its permeability.
Review
Energy & Fuels
He Li et al.
Summary: Chemical stimulation is a potential technology for enhancing coal permeability. Current research focuses on developing efficient chemical stimulation techniques and understanding the mechanisms of permeability enhancement. Laboratory studies have shown that acidising, oxidizing, organic solvent extraction, and electrochemistry stimulation techniques can improve coal permeability. Factors such as coal composition, pore-fracture structure, chemical reagent type, precipitation formation, in-situ stress, and water blocking influence the efficiency of permeability enhancement. The field application of chemical stimulation techniques is still limited, and future research should investigate their feasibility and consider the synergistic effects of chemical and physical stimulation techniques.
Article
Thermodynamics
Leilin Zhang et al.
Summary: The inhibition performance of nano-aluminum hydroxide (nano-ATH) foam on coal samples was evaluated, and the results showed that the treatment with nano-ATH foam increased the temperature points and decreased the weight loss percentage of the coal samples, leading to improved combustion performance.
THERMOCHIMICA ACTA
(2022)
Article
Energy & Fuels
Chaoping Xu et al.
Summary: The study investigates the impact of microwave-assisted oxidation on the pore structure and fractal characteristics of bituminous coal, finding that microwave heating destroys the pore structure and oxidation simplifies it, leading to an increase in total pore volume.
Article
Thermodynamics
Guanhua Ni et al.
Summary: This paper investigates the combustion performance of acidified coal and examines the effects of inorganic acids on coal combustion. The results show that inorganic acids can destroy the C=O in coal and significantly enhance the reaction rate and thermal effect of the combustion stage. Consequently, the comprehensive combustion performance of the coal is improved.
Article
Energy & Fuels
Leilin Zhang et al.
Summary: By adding nano-ATH, a stable and formable foam was successfully prepared, which effectively prevented the spontaneous combustion of coal in goaf. The experimental results showed that the addition of nano-ATH significantly increased the viscoelastic modulus of the foam liquid film, enhanced mechanical strength, stability, and foam volume, while also exhibiting good flame retardant and smoke suppression properties.
Article
Energy & Fuels
Jiexin Lu et al.
Summary: The research shows that microwave heating can improve the microstructure of coal, increase the volume and connectivity between mesopores and micropores, and reduce the methane adsorbability of coal.
Article
Energy & Fuels
Haotian Yang et al.
Summary: The study investigated the impact of acidification technology on the composition and structure of coal samples by treating powdered coal samples with acetic acid. The results showed that acetic acid can effectively dissolve minerals in coal and create micro-fractures, playing a significant role in increasing the porosity of coal reservoirs.
Article
Engineering, Chemical
Guanhua Ni et al.
Article
Engineering, Geological
He Li et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2020)
Article
Engineering, Chemical
He Li et al.
Article
Chemistry, Applied
He Li et al.
FUEL PROCESSING TECHNOLOGY
(2019)
Article
Thermodynamics
He Li et al.
Article
Energy & Fuels
Zheng Wang et al.
Article
Energy & Fuels
Baoyong Zhang et al.
Article
Energy & Fuels
Reydick D. Balucan et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2018)
Article
Energy & Fuels
Zhenhua Jing et al.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2018)
Article
Energy & Fuels
Luc G. Turner et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2016)
Article
Energy & Fuels
Reydick D. Balucan et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2016)
