☆ 4.7 Article

Periodic action mechanism of soaking on the evolution of lignite pore structure and microactive groups

FUEL (2024)

相关参考文献

注意：仅列出部分参考文献，下载原文获取全部文献信息。

Article Thermodynamics

Effect of water immersion on pore structure of bituminous coal with different metamorphic degrees

Bobo Song et al.

Summary: It is crucial to understand the mechanism of disaster caused by dried water-immersed coal by studying its influence on coal pore structure. This study conducted low-temperature nitrogen adsorption experiments on eight different metamorphic bituminous coals and their dried water-immersed coals to analyze the adsorption/desorption mechanism and investigate the effects on pore shape, pore-structure parameters, and fractal dimension. The results showed that water immersion had minimal effect on the pore shape of the coal, but decreased specific surface area and adsorption capacity while increasing total pore volume and average pore diameter. It had the greatest impact on the average pore size of moderately metamorphosed coals, which could accelerate coal oxidation and worsen gas emission. The fractal results revealed that water immersion reduced the surface fractal dimension of higher and lower metamorphic coal, while it increased that of moderately metamorphic coal, with the opposite effect on the structural fractal dimension.

ENERGY (2023)

添加到收藏夹

Article Environmental Sciences

Study on the thermal release characteristics and the correlation transformation mechanism of microscopic active groups of oxidized coal combustion in a deep mined-out area

Hui-yong Niu et al.

Summary: With the increase of deep mining, the risk of residual coal spontaneous combustion in deeply mined areas is gradually rising. This study investigated the thermal characteristics and microgroup transformation mechanisms during the secondary oxidation of deep-well oxidized coal. The research results provide a theoretical reference for the prevention and control of coal fires in deep mines.

SCIENCE OF THE TOTAL ENVIRONMENT (2023)

添加到收藏夹

Article Engineering, Environmental

Experimental investigation on the fractal feature of pore-fracture systems in bituminous coal and its influencing factors

Jiren Tang et al.

Summary: This study used SEM, box-counting method, and low-pressure N-2 adsorption (LPN(2)A) to investigate the surface roughness and structure irregularity of typical bituminous coal samples. The results showed significant variations in pore morphology among the different coal samples, with macropores dominating in some samples and mesopores taking a leading role in others. The fractal dimension of pore-fractures varied with different coal types and was influenced by coal maturity, tectonic deformation, coal components, and pore structure. The ash content was found to play a vital role in structure irregularity by reducing the fractal dimension.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2022)

添加到收藏夹

Article Energy & Fuels

Spontaneous combustion characteristics and mechanism of water-immersed and air-dried brown coal

Huiyong Niu et al.

Summary: This study reveals the influential laws and mechanism of water immersion on the spontaneous combustion traits of lignite in the low-temperature oxidation stage. The research objects were raw coal and coal immersed in water for different durations. Various tests and analyses were conducted to explore the pore evolution characteristics and functional group migration law of coal. The findings demonstrate that the spontaneous combustion intensity of water-immersed coal is generally greater than that of raw coal, with the highest intensity observed in coal immersed for 30 and 150 days. The increase in oxidation activity is attributed to the increased number of micropores, expanded pores, and changes in the content of active groups in the water-immersed coal.

ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS (2022)

添加到收藏夹

Article Energy & Fuels

Study on pore structure change and lean oxygen re-ignition characteristics of high-temperature oxidized water-immersed coal

Yun-chuan Bu et al.

Summary: This study investigates the effects of high-temperature oxidation and water immersion on coal samples using scanning electron microscopy and experimental methods. The results show that high-temperature oxidation and water immersion result in rougher surfaces and increased pore sizes in the coal samples. The presence of pores affects the maximum exothermic temperature and initial exothermic temperature changes during low-temperature oxidation, while mesopores and macropores primarily impact total heat release during high-temperature oxidation. Additionally, a high oxygen concentration promotes the oxidation and re-ignition process of the coal samples.

FUEL (2022)

添加到收藏夹

Article Green & Sustainable Science & Technology

Study of the microstructure and oxidation characteristics of residual coal in deep mines

Hui-yong Niu et al.

Summary: This study investigated the pore evolution characteristics and functional group migration of coal in a thermal environment using N-2 adsorption and infrared spectroscopy. A temperature-programmed test system was used to simulate the low-temperature oxidation process in deep coal seams. The results showed that residual coal in deep mines has larger pore oxygen storage capacities and coal oxygen contact areas compared to coal in shallow seams. The deep thermal environment accelerates the condensation decomposition of aliphatic hydrocarbon groups and fracture of side chain hydrogen bonds, increasing the exothermic intensity of the oxidation process and making the coal more prone to spontaneous combustion.

JOURNAL OF CLEANER PRODUCTION (2022)

添加到收藏夹

Article Energy & Fuels

The influence of long-time water intrusion on the mineral and pore structure of coal

Leilei Si et al.

Summary: Intrusion of formation water into coal seams reduces gas extraction efficiency. Experiments showed decreased mineral content and changed pore structure in coal due to water intrusion. Factors such as clay mineral collapse, mineral dissolution, and coal swelling play significant roles in influencing the pore structure of coal during water intrusion.

FUEL (2021)

添加到收藏夹

Article Green & Sustainable Science & Technology

Re-ignition characteristics of the long-flame coal affected by high-temperature oxidization & water immersion

Yong-liang Xu et al.

Summary: The research showed that pre-oxidation and water-immersion could increase the number and diameter of pores in coal, as well as enhance the coal's oxygen reaction capacity and content of functional groups. Coal samples under pre-oxidation and water-immersion conditions were more prone to re-ignition and had higher heat release.

JOURNAL OF CLEANER PRODUCTION (2021)

添加到收藏夹

Article Energy & Fuels

Effect of ionic liquid treatment on pore structure and fractal characteristics of low rank coal

Li Zhao et al.

FUEL (2020)

添加到收藏夹

Article Thermodynamics

Study on the Influence of Water Immersion on the Characteristic Parameters of Spontaneous Combustion Oxidation of Low-Rank Bituminous Coal

Zhai Xiaowei et al.

COMBUSTION SCIENCE AND TECHNOLOGY (2019)

添加到收藏夹

Article Energy & Fuels

Insight into the chemical reaction process of coal self-heating after N2 drying

Jinhu Li et al.

FUEL (2019)

添加到收藏夹

Article Energy & Fuels

Thermal effects and active group differentiation of low-rank coal during low-temperature oxidation under vacuum drying after water immersion

Xiaoxing Zhong et al.

FUEL (2019)

添加到收藏夹

Article Energy & Fuels

Experiment study of mechanical properties and microstructures of bituminous coals influenced by supercritical carbon dioxide

Meng Meng et al.

FUEL (2018)

添加到收藏夹

Review Green & Sustainable Science & Technology

China's energy status: A critical look at fossils and renewable options

S. Danlami Musa et al.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2018)

添加到收藏夹

Article Energy & Fuels

Exploring effect of water immersion on the structure and low-temperature oxidation of coal: A case study of Shendong long flame coal, China

Song Shuang et al.

FUEL (2018)

添加到收藏夹

Article Energy & Fuels

Characteristics of pore structure and fractal dimension of low-rank coal: A case study of Lower Jurassic Xishanyao coal in the southern Junggar Basin, NW China

Haijiao Fu et al.

FUEL (2017)

添加到收藏夹

Article Multidisciplinary Sciences

Study Governing the Impact of Long-Term Water Immersion on Coal Spontaneous Ignition

Yongliang Yang et al.

ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING (2017)

添加到收藏夹

Article Chemistry, Applied

Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy

Yan-Na Han et al.

FUEL PROCESSING TECHNOLOGY (2016)

添加到收藏夹

Article Energy & Fuels

Kinetic study on changes in methyl and methylene groups during low-temperature oxidation of coal via in-situ FTIR

Yulong Zhang et al.

INTERNATIONAL JOURNAL OF COAL GEOLOGY (2016)

添加到收藏夹

Article Energy & Fuels

Anisotropic swelling behaviour of coal matrix cubes exposed to water vapour: Effects of relative humidity and sample size

Jinfeng Liu et al.

INTERNATIONAL JOURNAL OF COAL GEOLOGY (2016)

添加到收藏夹

Article Energy & Fuels

Impacts of long-term water inrush on characteristics of coal gas adsorption and seepage

Yongliang Yang et al.

INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY (2016)

添加到收藏夹

Article Chemistry, Multidisciplinary

Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report)

Matthias Thommes et al.

PURE AND APPLIED CHEMISTRY (2015)

添加到收藏夹

Article Energy & Fuels

Characterization of chemical functional groups in macerals across different coal ranks via micro-FTIR spectroscopy

Yanyan Chen et al.

INTERNATIONAL JOURNAL OF COAL GEOLOGY (2012)

添加到收藏夹

Article Chemistry, Applied

Moisture readsorption and low temperature oxidation characteristics of upgraded low rank coal

Hokyung Choi et al.

FUEL PROCESSING TECHNOLOGY (2011)

添加到收藏夹

Article Energy & Fuels

MOISTURE-INDUCED SWELLING OF COAL

Robyn Fry et al.

INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION (2009)

添加到收藏夹

Article Chemistry, Physical

Fractal analysis of physical adsorption on material surfaces

M Mahnke et al.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2003)

添加到收藏夹

Article Thermodynamics

Role of inherent water in low-temperature oxidation of coal

HH Wang et al.

COMBUSTION SCIENCE AND TECHNOLOGY (2003)

添加到收藏夹

© Peeref 2019-2024. All rights reserved.