Supercritical gas sorption on moist coals

Day, Stuart; Sakurovs, Richard; Weir, Steve

doi:10.1016/j.coal.2008.01.003

Cited by 287 publications

(193 citation statements)

References 26 publications

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“…Studies have shown that there is a positive relation between micropore SSA and methane adsorption [1,26,29,32]. In this study, after CS 2 treatment, the change in methane adsorption capacity on coal before and after R o,max = 1 3% is increased and decreased, which confirms the changes in pore structure due to CS 2 treatment.…”

Section: Effects Of Pore Structure Changes On Methane Adsorptionsupporting

confidence: 70%

“…Many studies have shown that the pore size distribution is affected by the coal rank and there is a U-shaped relationship between the pore size distribution and coal rank [24]. A number of studies concluded that micropores and transitional pores are the primary space for CBM storage, whereas meso-and macropores are responsible for CBM migration [1,[25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…Methane adsorption in coal is controlled by internal factors, including coal rank, macerals (vitrinite, exinite, and inertinite), and pore size distribution [1,26,29,30,32], and influenced by external factors, such as temperature, pressure, and humidity [26,33,34]. The methane adsorption capacity in coal increases with coal rank and vitrinite content in macerals at high coal ranks, which is because vitrinite is more microporous with a higher SSA than inertinite is [35,36].…”

Section: Introductionmentioning

confidence: 99%

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Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

et al. 2018

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The pore structure and gas adsorption are two key issues that affect the coal bed methane recovery process significantly. To change pore structure and gas adsorption, 5 coals with different ranks were treated by CS 2 for 3 h using a Soxhlet extractor under ultrasonic oscillation conditions; the evolutions of pore structure and methane adsorption were examined using a highpressure mercury intrusion porosimeter (MIP) with an AutoPore IV 9310 series mercury instrument. The results show that the cumulative pore volume and specific surface area (SSA) were increased after CS 2 treatment, and the incremental micropore volume and SSA were increased and decreased before and after R o,max = 1 3%, respectively; the incremental big pore (greater than 10 nm in diameter) volumes were increased and SSA was decreased for all coals, and pore connectivity was improved. Methane adsorption capacity on coal before and after R o,max = 1 3% also was increased and decreased, respectively. There is a positive correlation between the changes in the micropore SSA and the Langmuir volume. It confirms that the changes in pore structure and methane adsorption capacity due to CS 2 treatment are controlled by the rank, and the change in methane adsorption is impacted by the change of micropore SSA and suggests that the changes in pore structure are better for gas migration; the alteration in methane adsorption capacity is worse and better for methane recovery before and after R o,max = 1 3%. A conceptual mechanism of pore structure is proposed to explain methane adsorption capacity on CS 2 treated coal around the R o,max = 1 3%.

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Section: Effects Of Pore Structure Changes On Methane Adsorptionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

et al. 2018

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“…It is obvious that not all the theoretical size can be used for storage of carbon dioxide due to technical reasons. Another issue is the injection of carbon dioxide into the deep coal layers of over 1000 meters, where the static pressure of overburden exceeds 27 MPa [18], the carbon dioxide exists as a supercritical fluid having a density of 0.468 g/cm 3 [19]. Then sorption capacity may reach values ranging from 1.25 to 2 mmol CO2 per gram of coal.…”

Section: Resultsmentioning

confidence: 99%

Application of multiple sorption model to estimation of CO₂sequestration capacity or CH₄recovery in polish hard coals

et al. 2017

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Abstract. The aim of the study is to estimate the theoretical capacity of coal deposits in terms of carbon dioxide storage and methane recovery estimate during the injection of carbon dioxide. The Multiple Sorption Model was used for this purpose. The range of sorption measurement data on which the simulations were based does not exceed the critical point for both methane and carbon dioxide. The model allows to calculate absorption, adsorption, expansion and total theoretical sorption. For further consideration absorption was used as the process of the percolation of the gas in the bulk of the coal matter as well as the total theoretical sorption, the occurrence of which is possible due to the presence of fractures in the coal seam. Calculated levels of absorption and the total theoretical adsorption were applied to estimate the possible storage capacity of carbon dioxide based on the data associated with the content of coal in the mining fields of individual Polish coal mines. Moreover, MSM development for the gas mixture sorption can be used to roughly assess the recovery of methane naturally occurring in coal deposits during such a process.

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“…Thus, "desorption" means a number of processes resulting in the release of the sorbing gas from the sorbent. When speaking about the release of methane from a coal bed into an excavation, we typically mean the combination of the filtration (Crank 1975;Timofejew 1967;Pillalamarry et al 2011;Hu et al 2009;Wu et al 1998), diffusion, and sorption processes, which will further be referred to as "the sorption proper" (Harpalani and Chen 1997;Pillalamarry et al 2011;Day and Sakurovs 2008;Weniger et al 2010;CeglarskaStefańska and Zarębska 2005;Majewska et al 2009;Busch and Gensterblum 2011;Nagaoka and Imae 2003). Under laboratory conditions, in which case the investigations are carried out for small-sized grain samples, we can assume that the transportation of gas is influenced mainly by the diffusion processes.…”

Section: Introductionmentioning

confidence: 99%

Sorption Rate of Carbon Dioxide on Coal

Gawor

Skoczylas

2013

Transp Porous Med

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Traditionally, physicochemical processes whose result is the release of methane from a coal sample-often referred to as desorption-are discussed in relation to two phenomena, i.e., the transportation of gas inward (or outward) the porous substance, and the desorption (or sorption) proper of gas from the coal surface. The complex pore structure of coal necessitated the adoption of an arbitrary division of the gas transportation into: the diffusion of gas within the pore network in grains (understood as a molecular phenomenon) and the filtration of gas through the system of fissures and large pores (understood as a phenomenon related to the fluid mechanics). The filtration-type transportation of gas through a porous medium is most typically discussed in the context of the flow of gas through coal beds, or other porous rocks. In laboratory analyses carried out on granular samples obtained from the porous material, the filtrational flow of gas among the sorbent grains and within the fissure system is so fast (as compared to the diffusion occurring inside the grains) that the decisive factor influencing the kinetics of gas release is, most often, diffusion. In the case of such observations, it is assumed that the process of the sorption proper is almost instantaneous in its nature. There are no theoretical premises that would challenge an assumption thus formed, however, it would be very interesting to carry out an experiment confirming their existence. The present paper discusses an attempt to estimate, under laboratory conditions, the kinetics of the sorption proper. It provides a description of the specially built measuring equipment, as well as the results of the performed experiments, together with their analysis. In the performed experiments, the obtained time constants of sorption were smaller than 50 ms. The lowest values did not exceed 10 ms. Since the obtained time constant values are very low-in spite of the fact that it was impossible to completely eliminate the delays connected with the transportation of molecules to the sorption sites-the authors are of the opinion that the process of sorption proper shall be assumed to be instantaneous.

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Supercritical gas sorption on moist coals

Cited by 287 publications

References 26 publications

Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

Application of multiple sorption model to estimation of CO₂sequestration capacity or CH₄recovery in polish hard coals

Sorption Rate of Carbon Dioxide on Coal

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Supercritical gas sorption on moist coals

Cited by 287 publications

References 26 publications

Changes in Pore Structure of Coal Caused by CS2 Treatment and Its Methane Adsorption Response

Changes in Pore Structure of Coal Caused by CS2 Treatment and Its Methane Adsorption Response

Application of multiple sorption model to estimation of CO2sequestration capacity or CH4recovery in polish hard coals

Sorption Rate of Carbon Dioxide on Coal

Contact Info

Product

Resources

About

Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

Changes in Pore Structure of Coal Caused by CS₂ Treatment and Its Methane Adsorption Response

Application of multiple sorption model to estimation of CO₂sequestration capacity or CH₄recovery in polish hard coals