Carbon dioxide sorption on polish ortholignite coal in low and elevated pressure

Baran, Paweł; Cygankiewicz, J.; Zarębska, Katarzyna

doi:10.1016/j.jcou.2013.09.003

Cited by 17 publications

(10 citation statements)

References 18 publications

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“…As a crucial evaluation index for the thermodynamic process in physical adsorption tests, the isosteric heat of adsorption for scCO 2 in coal has rarely been considered by researchers. There are still several issues that exist regarding the calculation of this index for scCO 2 adsorption in coal (Pan et al, 1998;Chakraborty et al, 2006;Stadie, 2012;Baran et al, 2013;Stadie et al, 2013Stadie et al, & 2015. First, the absolute adsorption isotherms must be obtained from the observed adsorption isotherms in order to calculate the isosteric heat of adsorption, where a robust model is needed (Herbst et al, 2002;Bae et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

Tang

Ripepi

2017

Journal of CO2 Utilization

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This work uses a dual-site Langmuir adsorption model to describe supercritical carbon dioxide (scCO 2) adsorption in coal up to 20MPa and 253K. The isosteric heat of adsorption for scCO 2 in coal is calculated analytically by considering both the real gas behavior and the adsorbed phase, which are ignored in the classic Clausius-Clapeyron approximation. It was found that the proposed model can not only reasonably interpret observed test phenomena but also has the intrinsic ability to extrapolate adsorption isotherms under different temperatures beyond test data. The crossovers of the observed adsorption isotherms under different temperatures are caused by the changing volume of the adsorbed phase during the adsorption process. Both the temperature dependence and adsorption uptake dependence of isosteric heat of adsorption are revealed; the higher the temperature and the adsorption uptake, the lower the isosteric heat of adsorption. The ideal gas law overestimates the isosteric heat of adsorption for scCO 2 in coal. The application of the dual-site Langmuir model allows for estimating the CO 2 storage capacity of deep unminable coal seams, modeling CO 2 transport behavior via differentiating the true ratio between bulk phase and adsorbed phase, and investigating the true thermodynamic characteristics of CO 2 in coal under high pressures.

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Section: Introductionmentioning

confidence: 99%

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

Tang

Ripepi

2017

Journal of CO2 Utilization

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“…Mining operations can cause temperature changes of 10° or more. This situation can lead to a disturbance of the equilibrium in the coal–gas system followed by gas pressure change; thus, the amount of sorbed gas will change as well (Baran et al., 2013; Qu et al., 2014; Wang et al., 2015).…”

Section: Resultsmentioning

confidence: 99%

Development of temperature-induced strains in coal–CH₄and coal–CO₂systems

Baran

Czerw

Czuma

et al. 2018

Adsorption Science & Technology

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Expansion/contraction of coal, induced by the sorption of carbon dioxide and methane in isothermal and non-isothermal conditions, was measured. The investigation is of great importance in the context of validating the potential CO 2 sequestration in unmined coal seams. Changes in temperature in underground coal beds can influence the sorption balance, resulting in strains in coal strata, which could lead to the desorption of gas and leaks to the ground surface. The research shows that the strains induced by CO 2 sorption are about twice the size of those resulting from the sorption of CH 4. The linear strains are anisotropic and greater in the direction perpendicular to the bedding plane. The results of the non-isothermal experiments show that a temperature increase gives rise to the sample swelling in the presence of methane, but a different pattern is observed for coal-CO 2 systems, where sample contraction occurs. This behaviour is explained by the different mechanism of CH 4 and CO 2 deposition and by the diversity in the maceral composition of the samples.

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“…Gas can occur in rocks in the following forms: adsorbed, absorbed, dissolved and free [1,2]. Gas occurring in rocks under a considerable pressure value becomes a source of energy, which is the main cause of gas and rock outbursts [3][4][5]. A necessary condition for the initiation of an outburst is an instance in which the work necessary to crush the rock is smaller than the gas energy.…”

Section: Introductionmentioning

confidence: 99%

The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

Kudasik¹,

Pajdak²,

Skoczylas³

2018

Preprint

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The article discusses the validation process of a certain method of balancing gas contained in the pore space of rocks. The validation was based upon juxtaposition of the examination of rocks' porosity and the effects of comminution in terms of assessing the possibility of opening the pore space. The tests were carried out for six dolomite samples taken from different areas of the 'Polkowice-Sieroszowice’ copper mine in Poland. Before the rock material was ground, it was examined using the porosimetric method and subsequently subjected to the SEM analysis. After grinding, the research material was subjected to the granulometric analysis. Prior to the grinding process, the rocks' porosity fell in the range of 0.3-14.8%, while the volume of the open pores was included in the 0.01-0.06 cm3/g range. The research material was also characterized by inhomogeneous distribution of the pore volume. The grinding process was performed using an original device – the GPR analyzer. The ground samples were characterized by similar particle size distribution and mean diameters D_3.2 of about 4.0-4.5 µm. The SEM analysis revealed pores of various size and shape on the surface of the rock cores, while at the same time demonstrating lack of pores following the grinding process. The grain size distribution curves were compared with the cumulative pore volume curves of the cores before grinding. The resulting intersection points of both curves were seen as testifying to the presence of openings in the rock pores and release of the accumulated gas. The opening percentage of the pore space was associated with the coordinates of the curves' intersections. In order to confirm the argument put forward in this paper – i.e. that comminution of a rock to grains of a size comparable with the size of the rock's pores results in the release of gas contained in the pore space – the amount of gas released as a result of the comminution process was studied. The results of gas balancing demonstrated that the pore space of the investigated dolomites was filled with gas in amounts from 3.19 cm3/kg to 45.86 cm3/kg. The obtained results of the rock material comminution to grains comparable – in terms of size – to the size of the pores of investigated rocks, along with asserting the presence of gas in the pore space of the studied dolomites, were regarded as a proof that the method of balancing gas in rocks via rock comminution is correct.

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Carbon dioxide sorption on polish ortholignite coal in low and elevated pressure

Cited by 17 publications

References 18 publications

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

Development of temperature-induced strains in coal–CH₄and coal–CO₂systems

The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

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Carbon dioxide sorption on polish ortholignite coal in low and elevated pressure

Cited by 17 publications

References 18 publications

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

High pressure supercritical carbon dioxide adsorption in coal: Adsorption model and thermodynamic characteristics

Development of temperature-induced strains in coal–CH4and coal–CO2systems

The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

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Development of temperature-induced strains in coal–CH₄and coal–CO₂systems