The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals

Cao, Liwen; Sang, Shuxun; Zhou, Xiaozhi; Wang, Zhenzhi; Wu, Zhiyong

doi:10.1016/j.energy.2017.11.095

Cited by 90 publications

(37 citation statements)

References 82 publications

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“…The first stage of the research consisted of sorption-dilatometric measurements taken at 323 K. The experimental results are presented in the form of sorption kinetics and volume deformations in Figure 2. The course of the kinetics of sorption of both gases is typical [17,[27][28][29], while the sorption capacity of the coal sample in relation to carbon dioxide is higher than for methane. In the case of dilatometric kinetics, the volume changes associated with the absorption of carbon dioxide are almost five times higher than those induced by methane.…”

Section: Analysis Of Resultsmentioning

confidence: 94%

“…In the case of dilatometric kinetics, the volume changes associated with the absorption of carbon dioxide are almost five times higher than those induced by methane. To analyse the effect of the quantity of sorbed gas on the swelling of coal, a graph of the volume change in the sample, as a function of the amount of gas absorbed, was created ( Figure 3): The course of the kinetics of sorption of both gases is typical [17,[27][28][29], while the sorption capacity of the coal sample in relation to carbon dioxide is higher than for methane. In the case of dilatometric kinetics, the volume changes associated with the absorption of carbon dioxide are almost five times higher than those induced by methane.…”

Section: Analysis Of Resultsmentioning

confidence: 99%

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The Influence of Temperature on the Expansion of a Hard Coal-Gas System

et al. 2018

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This paper presents experimental results of the sorption-dilatometric kinetics of methane and carbon dioxide on a sample of hard coal from one of the coal mines in the Upper Silesian Coal Basin. The experiment included isothermal and non-isothermal-isobaric stages. For the isothermal stage, it was found that, up to a certain point (about 8 dm3/kg), the sample’s expansion was linearly related to the amount of gas absorbed. Studies on dilatometric kinetics under constant pressure, with a reduction in temperature, indicate that a dominant share of the heat-expanding properties of carbonaceous material influences changes in the size of the sample in the coal-gas system. It was also found that the sample expansion, due to temperature change, was 2.25‰, for the sample in both the vacuum and the non-adsorbing gas atmosphere.

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Section: Analysis Of Resultsmentioning

confidence: 94%

Section: Analysis Of Resultsmentioning

confidence: 99%

The Influence of Temperature on the Expansion of a Hard Coal-Gas System

et al. 2018

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“…Coal spontaneous combustion (CSC) causes huge economic losses and casualties, with the toxic and harmful gases produced during coal combustion not only polluting the working environment, but also causing great damage to the ecological environment (Kong et al, 2017). Some scholars (Niu et al, 2017;Peña et al, 2018;Liu et al, 2018) have studied various aspects of coal (e.g. geological conditions, moisture content, and particle size) to prevent fires from CSC and control the pollution from the burning coal.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the major coal seam in typical coal mining areas of Southern Junggar coalfield, Xinjiang, China

Shen

Zeng

2020

Preprint

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In the present study, the authors collected coal samples from the Wudong (WD), Dahuangshan (DHS), and Sikeshu (SKS) coal mines in the Southern Junggar coalfield. The collected coal was ground into particle sizes of 0.25–0.38 mm, 0.15–0.18 mm, 0.109–0.12 mm, 0.08–0.096 mm, and <0.075 mm. The experimental data was acquired using diverse methods, such as in situ infrared spectroscopic analysis, temperature-programmed oxidation, and thermogravimetric analysis. The results show that the number of oxygen-containing functional groups increased with the decline in particle size, indicating that a smaller particle size may facilitate oxidation reactions and spontaneous coal combustion. On the basis of the analysis of the elements of coal samples, it can be concluded that the proportion of oxygen elements of coal samples in three mining areas is: WD＞SKS＞SHS. The oxygen consumption rate of the DHS and WD coal samples increased exponentially when the temperature increased; the rate of SKS coal samples initially rose significantly and then decreased. The gas generation rates for the different gases indicated that temperatures of 90 ℃ or 130 ℃ could accelerate the oxidation reaction. The pollutants produced by the oxidation of the SKS coal samples were higher than those by DHS and WD. For all particle diameters, the T3 for the SKS samples is smaller than that for WD and DHS, indicating that the SKS coal sample will combust more readily. With the decrease in particle size, the activation energy showed an increase in low-temperature oxidation stage. While the activation energy of the WD and SKS samples decreased in high temperature stage, that of the DHS increased before decreasing. A lower of activation energy means that the coal will have a higher risk of spontaneous combustion. Based on the differential scanning calorimetry (DSC) curve, SKS coal sample has the highest exothermic heat, the DHS has the second, and WD has the least. With a higher exothermic heat, the coal sample will more readily ignite.

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“…Skoczylas et al 16 prepared coal briquettes of various porosities (13.5%-33%); they were found to exhibit mechanical and gaseous properties similar to those of normal and altered coal. Niu et al 22 investigated the adsorption capacity, swelling effect, and permeability characteristics of coal seams with and without tectonic damage by using reconstituted coal produced by simulating in situ geological conditions. 17 The craftsmanship of making coal briquette specimens and the factors influencing their properties have been studied.…”

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confidence: 99%

“…Tu et al 21 used activated carbon as the analog material for the gas-enriched area and coal as the material for the normal area to induce artificial gas outbursts. Niu et al 22 investigated the adsorption capacity, swelling effect, and permeability characteristics of coal seams with and without tectonic damage by using reconstituted coal produced by simulating in situ geological conditions. These studies on seepage simulation materials improved our understanding of coal and gas seepage mechanisms and suggested new possible views.…”

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confidence: 99%

Modeling the relationship between the influencing factors and the multiple responses of coal‐like materials using Taguchi‐Gray correlation analysis for their utilization in gas seepage studies

Zou

2019

Energy Science & Engineering

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Coal‐like sampling obtained through compression molding is an important application of powder compression molding technology in mining engineering. To obtain ideal coal‐like samples for the revelation of the seepage property of low‐permeability soft coals, gas seepage studies, which utilized the Taguchi method, were performed on coal‐like materials with different particle sizes, activated carbon weight, Portland cement weight, and forming pressure. The effect of a single factor on the fluid‐solid coupling property of coal‐like materials was analyzed. The results indicate that the permeability and axial stress curves that correlated with strain in the conventional triaxial tests can be divided into three clear phases, and that layered damage appears in all tested specimens. The stress‐permeability relationship model of coal‐like materials is proposed. The influence of process parameters on the strength and permeability of coal briquettes during gas seepage tests was experimentally investigated. The Taguchi method and gray correlation analysis were integrated to determine the best combination of input factors through the key indicator of the gray relational grade, which is required to satisfy multiple quality goals in gas seepage coal‐like materials. The contribution percentage of the input factors to the outputs was determined using analysis of variance; it indicated that coal particle size was the prominent influencing parameter followed by activated carbon, forming pressure, and Portland cement.

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The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals

Cited by 90 publications

References 82 publications

The Influence of Temperature on the Expansion of a Hard Coal-Gas System

The Influence of Temperature on the Expansion of a Hard Coal-Gas System

Kinetics of the major coal seam in typical coal mining areas of Southern Junggar coalfield, Xinjiang, China

Modeling the relationship between the influencing factors and the multiple responses of coal‐like materials using Taguchi‐Gray correlation analysis for their utilization in gas seepage studies

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