Gas Sorption and the Consequent Volumetric and Permeability Change of Coal I: Experimental

Lin, Wilson; Kovscek, Anthony R.

doi:10.1007/s11242-014-0373-9

Cited by 47 publications

(18 citation statements)

References 9 publications

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“…p, ε L and P L are consistent with Equations (28) and (29). The BET adsorption model is a generalization of the Langmuir model considering multi adsorbed molecule layers, which is expressed by [57,61] …”

Section: Swelling Strain and Swelling Stresssupporting

confidence: 70%

Section: Swelling Strain and Swelling Stressmentioning

confidence: 99%

“…Some researchers held the view that gas adsorption satisfies the Langmuir isothermal adsorption model (Figure 8), and considers the linear relationship between adsorption capacity and swelling strain. Although a large number of studies have shown that gas adsorption presents a single molecule arrangement structure that meets the Langmuir model, Lin [57] and Yu et al [58] suggested that CO 2 adsorption on the coal mass can be described in a multi adsorbed layer model, i.e., the Brunauer-Emmett-Teller (BET) adsorption type model. Langmuir isotherm adsorption model equation is given by: (27) where q is the adsorbed amount of gas during adsorption reaching equilibrium, a is the gas limit adsorption capacity at the reference pressure, b is the adsorption equilibrium constant, and p p is the pore pressure.…”

Section: Swelling Strain and Swelling Stressmentioning

confidence: 99%

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Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

Liu

Wang

et al. 2017

Minerals

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CO 2 geosequestration is currently considered to be the most effective and economical method to dispose of artificial greenhouse gases. There are a large number of coal mines that will be scrapped, and some of them are located in deep formations in China. CO 2 storage in abandoned coal mines will be a potential option for greenhouse gas disposal. However, CO 2 trapping in deep coal pillars would induce swelling effects of coal matrix. Adsorption-induced swelling not only modifies the volume and permeability of coal mass, but also causes the basic physical and mechanical properties changing, such as elastic modulus and Poisson ratio. It eventually results in some reduction in pillar strength. Based on the fractional swelling as a function of time and different loading pressure steps, the relationship between volumetric stress and adsorption pressure increment is acquired. Eventually, this paper presents a theory model to analyze the pillar strength reduction after CO 2 adsorption. The model provides a method to quantitatively describe the interrelation of volumetric strain, swelling stress, and mechanical strength reduction after gas adsorption under the condition of step-by-step pressure loading and the non-Langmuir isothermal model. The model might have a significantly important implication for predicting the swelling stress and mechanical behaviors of coal pillars during CO 2 sequestration in abandoned coal mines.

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Section: Swelling Strain and Swelling Stresssupporting

confidence: 70%

Section: Swelling Strain and Swelling Stressmentioning

confidence: 99%

Section: Swelling Strain and Swelling Stressmentioning

confidence: 99%

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Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

Liu

Wang

et al. 2017

Minerals

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“…Exinite is derived from lipids and waxy plant substances, and is alternatively termed as liptininte. Intertinite originates from the oxidized plant materials, like char, attributed to wood fires that occurred during dry periods, during the formation of peat (Lin, 2010).…”

Section: Formation Of Coal and Its Basic Characteristicsmentioning

confidence: 99%

“…The complexity of the mixture of the organic molecules in coal is well represented in figure 2.2, which represents the chemical structure of bituminous coal. The molecular formula for the same is C661H561N4O74S6 and the molecular weight is 10,023 grams per mole (Lin, 2010).…”

Section: Formation Of Coal and Its Basic Characteristicsmentioning

confidence: 99%

Changes in properties of coal as a result of continued bioconversion

Pandey¹

2016

International Conference and Exhibition, Barcelona, Spain, 3-6 April 2016

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Microbial actions on coal have long been identified as a source of methane in coalbeds.Andrew Scott (1995) was the first to propose imitating the natural process of biogenic gasification, possibly leading to recharging coalbed methane (CBM) reservoirs, or setting up natural gas reservoirs in non-producing coalbeds. This study was aimed at identifying the changes in coal properties that affect gas deliverability in coal-gas reservoirs, when treated with microbial consortia to generate/enhance gas production. The experimental work tested the sorption and diffusion properties for the coal treated and, more importantly, the variation in the relevant parameters with continued bio-conversion since these are the first two phenomena in CBM production.During the first phase, single component sorption-diffusion experiments were carried out using pure methane and CO2 on virgin/baseline coals, retrieved from the Illinois basin. Coals were then treated with nutrient amended microbial consortia for different periods. Gas production was monitored at the end of thirty and sixty days of treatment, after which, sorption-diffusion experiments were repeated on treated coals, thus establishing a trend over the sixty-day period.The sorption data was characterized using Langmuir pressure and volume constants, obtained by fitting it over the Langmuir isotherm. The diffusion coefficient, D, was estimated by establishing ii the variation trend as a function of pore pressure. The pressure parameter was considered critical since, with continued production of methane, the produced gas diffuses into the coal matrix, where it gets adsorbed with increasing pressure. During production, the pressure decreases and the process is reversed, gas diffusing out of the coal matrix and arriving at the cleat system.The results indicated an increase in the sorption capacity of coal as a result of bioconversion. This was attributed to increased pore surface areas as a result of microbial actions. However, significant hysteresis was observed during desorption of methane and was attributed to preferential desorption from sorption sites in the pathways leading to pore cavities. This is corroborated by the increased rates of diffusion, especially for methane, which exhibited rates higher than that for CO2. This contradicted the results for untreated/baseline coal, which were in agreement with previous studies. Effort was made to explain this anomaly by the nonmonotonic dependence of effective diffusion coefficient on the size of the diffusing particles, where in coalbed environments, CO2 has smaller kinetic diameter than methane.iii ACKNOWLEDGMENTS I would like to express my sincere appreciation and gratitude to my academic advisor and Thesis Chair, Dr. Satya Harpalani, for his guidance, encouragement, constructive criticism and patience throughout my study. Without his help and advice, this study would not have been possible. I would also like to thank him for giving me the opportunity to come to Southern Illinois University and work under his supervision.

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Improved Porosity and Permeability Models with Coal Matrix Block Deformation Effect

Zhou

Yang

et al. 2016

Rock Mech Rock Eng

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Gas Sorption and the Consequent Volumetric and Permeability Change of Coal I: Experimental

Cited by 47 publications

References 9 publications

Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

Changes in properties of coal as a result of continued bioconversion

Improved Porosity and Permeability Models with Coal Matrix Block Deformation Effect

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