Methane sorption behavior on tectonic coal under the influence of moisture

Zhang, Qinghua; Liu, Xianfeng; Nie, Baisheng; Wu, Wei; Wang, Ran

doi:10.1016/j.fuel.2022.125150

Cited by 42 publications

(22 citation statements)

References 72 publications

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“…It is well known that coal contains large amounts of organic polymers mainly composed of carbon, hydrogen, and oxygen. Thus, on the surface of coal dust, there is a large number of alkyl, alkenyl, and other groups [ 41 , 42 , 43 ], and the hydrogen and oxygen in these groups can rapidly form hydrogen bonds with the oxygen and hydrogen in sucrose and water. Using hydrogen bonds, coal dust particles, sugar molecules, and water molecules could quickly form physical networks, resulting in the macroscopic phenomenon of the bonding of coal dust particles, as shown in Figure 17 d. Therefore, an agglutination layer can be formed when spraying a molasses solution on the surface of deposited coal dust, such as in open coal piles and underground roadways.…”

Section: Discussionmentioning

confidence: 99%

Suppression Characteristics and Mechanism of Molasses Solution on Coal Dust: A Low-Cost and Environment-Friendly Suppression Method in Coal Mines

Liu

Wang

Jin

et al. 2022

IJERPH

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Coal dust pollution poses a serious public health threat. This study aimed to investigate the feasibility of creating a coal dust suppressant using molasses, a byproduct of the sugar industry. We studied the effects of a molasses solution of varying concentrations (i.e., ranging from 0% (pure water) to 40%) on the moisture, bonding, and wind erosion properties of coal dust. Overall, the effectiveness of the molasses increased with their concentration, and it manifested itself in the following way: (1) the molasses improved the anti-evaporation ability of wet coal dust. For example, the evaporation mass of the coal dust wetted using a molasses solution decreased by 82.8%; (2) molasses effectively agglutinated coal dust; (3) molasses can effectively decrease the surface tension and increase the viscosity of the wetting solution. The surface tension of the molasses solution reached 41.37 mN/m and the viscosity increased to 6.79 mPa·s; (4) molasses can significantly suppress the wind erosion of deposited coal dust, with its wind erosion mass decreasing 99.1%; finally, (5) the effectiveness of molasses at suppressing coal dust was discussed at a molecular level. This study highlights the feasibility of a low-cost and environment-friendly dust suppressant in coal mines.

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Section: Discussionmentioning

confidence: 99%

Suppression Characteristics and Mechanism of Molasses Solution on Coal Dust: A Low-Cost and Environment-Friendly Suppression Method in Coal Mines

Liu

Wang

Jin

et al. 2022

IJERPH

Self Cite

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“…To accurately describe the methane adsorption characteristics under high-temperature and high-pressure conditions, this paper selected for research the most representative of the adsorption models among the Langmuir monolayer model, BET multimolecular layer model, L–F adsorption model, and micropore filling mode − based on the adsorption potential theory. Langmuir monolayer model n ab = n 0 × b × p 1 + b × p L–F model n ab = n 0 × false( b × p false) n 1 + false( b × p false) n BET multimolecular layer model n ab = n 0 × c × p ( p 0 − p ) [ 1 + false( c − 1 false) p / p 0 ] D–R model n ab = n 0 0.25em exp nobreak0em.25em⁡ true{ prefix− D true[ ln ( p 0 …”

Section: Isothermal Adsorption Model Of Coking Coal Under High-temper...mentioning

confidence: 99%

“…To accurately describe the methane adsorption characteristics under high-temperature and high-pressure conditions, this paper selected for research the most representative of the adsorption models among the Langmuir monolayer model, BET multimolecular layer model, L–F adsorption model, and micropore filling mode 48 − 50 based on the adsorption potential theory. Langmuir monolayer model L–F model BET multimolecular layer model D–R model D–A model where n ab is the excess adsorption capacity, cm 3 /g; n 0 is the limit adsorption capacity, cm 3 /g; b is a constant related to the adsorbent, adsorbate properties, and temperature, MPa –1 ; c , n , and D are coefficients; p is the pressure, MPa; and p 0 is the saturated vapor pressure, MPa.…”

Section: Isothermal Adsorption Model Of Coking Coal Under High-temper...mentioning

confidence: 99%

Study on Adsorption Characteristics of Deep Coking Coal Based on Molecular Simulation and Experiments

et al. 2023

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To study the effect of high temperature and high pressure on the adsorption characteristics of coking coal, Liulin coking coal and Pingdingshan coking coal were selected as the research objects, and isotherm adsorption curves at different temperatures and pressures were obtained by combining isotherm adsorption experiments and molecular dynamics methods. The effect of high temperature and high pressure on the adsorption characteristics of coking coal was analyzed, and an isothermal adsorption model suitable for hightemperature and high-pressure conditions was studied. The results show that the adsorption characteristics of deep coking coal can be well characterized by the molecular dynamics method. Under a supercritical condition, the excess adsorption capacity of methane decreases with the increase of temperature. With the increase of pressure, the excess adsorption capacity rapidly increases in the early stage, temporarily stabilizes in the middle stage, and decreases in the later stage. Based on the classical adsorption model, the adsorption capacity of coking coal under high-temperature and high-pressure environments is fitted. The fitting degree ranges from good to poor. The order is D−R > D−A > L−F >BET > Langmuir, and combined with temperature gradient, pressure gradient, and the D−R adsorption model, it can be seen that after 800 m deep in Liulin Mine and 400 m deep in Pingdingshan Mine, the adsorption capacity of coking coal to methane decreases with the increase of depth.

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“…The adsorption capacity of coal is influenced by intrinsic factors such as the degree of metamorphism, mineral components, pore structure, and chemical structure . It is also controlled by extrinsic conditions such as temperature, humidity, particle size, and stress. − Coal is a porous organic medium, and numerous studies have shown that the micropores account for the majority of the total pore and specific surface area. − The pore size has an important influence on the adsorption behavior, and the forces between the pore walls of the micropores significantly affect the accumulation and density of the adsorbate . The shape of the pores also has a different effect on adsorption; the adsorption capacity of cylindrical pores is higher than that of spherical pores .…”

Section: Introductionmentioning

confidence: 99%

Molecular Simulation of the Pore Structure and Adsorption Properties of Coal under Compression Stress

2023

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The deformation of the macromolecular structure of coal under compression stress may affect the pore structure and adsorption properties. In this study, the Grand Canonical Monte Carlo and molecular dynamics methods were used to investigate the effects of compression stress on the pore structure and adsorption properties of coal, and the coupling relationships between stress, strain, pore structure, and adsorption properties were explored. A macromolecular model of coal was constructed, and uniaxial compression simulation was conducted. The increase of compression stress reduces the pore volume, specific surface area, and connectivity of coal and concentrates the pore size distribution in pores with smaller sizes. The increase of stress leads to a different degree of reduction in the adsorption performance of coal on CH 4 and CO 2 , and the stress sensitivity of CH 4 is slightly stronger than that of CO 2 . The results of adsorption configurations in the pores under different strains indicate that the reduction of adsorption properties is controlled by the pore volume and pore connectivity. The adsorption performance of CH 4 and CO 2 in coal at different strains has a good linear relationship with the volume and specific surface area of the pores; the smaller the volume and specific surface area of the pores, the weaker the adsorption performance of coal. This study clarifies the control of the strain response under compression stress on the pore structure and adsorption properties of coal and provides guidance for the study of adsorption, desorption, and diffusion of CBM.

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Methane sorption behavior on tectonic coal under the influence of moisture

Cited by 42 publications

References 72 publications

Suppression Characteristics and Mechanism of Molasses Solution on Coal Dust: A Low-Cost and Environment-Friendly Suppression Method in Coal Mines

Suppression Characteristics and Mechanism of Molasses Solution on Coal Dust: A Low-Cost and Environment-Friendly Suppression Method in Coal Mines

Study on Adsorption Characteristics of Deep Coking Coal Based on Molecular Simulation and Experiments

Molecular Simulation of the Pore Structure and Adsorption Properties of Coal under Compression Stress

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