Interpretation of carbon dioxide diffusion behavior in coals

Siemons, N; Wolf, Karl‐Heinz; Bruining, J.

doi:10.1016/j.coal.2007.04.004

Cited by 85 publications

(59 citation statements)

References 17 publications

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“…Experiments were performed using the apparatus and test procedures described by Majewska et al [17]. Our findings translate into general conclusions:  for two equations based on the bidisperse gas transport model, the equation proposed by Busch et al [18] gives better fit than the equation proposed by Siemons et al [26],  the pseudo-second-order equation (PSOE) of Marecka and Mianowski [30] was unsuitable for the data  the Elovich equation fits the results well, because the sorption and sorption-induced expansion were far from equilibrium, however, because the function goes to infinity it should be avoided  the stretched exponential equation gives the best fit and is in very good agreement with the experimental results [29].…”

Section: Introductionsupporting

confidence: 51%

“…To interpret and quantify the observed gas uptake rates in coal two models have been used: unipore model, based on the solution to Fick's second law for spherical symmetric flow [18][19][20][21][22] and bidisperse sorption/diffusion gas transport model for coals characterized by two distinct pore systems [18,20,[23][24][25][26][27][28]. It is generally confirmed that the amount micropores increase and mesopores decrease with coal rank.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of methane and carbon dioxide sorption and sorption–induced expansion of coal – kinetic equations assessment

et al. 2016

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Abstract. The aim of this study was to investigate the ability of kinetic equations to describe the sorption kinetics and expansion rate of solid coal samples. In order to address his issue the sorption kinetics of methane and carbon dioxide on bituminous coals were studied. At the same time, the changes occurring in the sample's overall dimensions, which accompanied sorption processes, were monitored. Experiments were carried out at high pressure by means of the volumetric method on a cubicoid solid samples. Several literature-based modeling approaches and equations are proposed to fit the kinetic curves of gas deposition, as well as the adequate kinetics of coal swelling. First equation represents the traditional approach to interpret experimental data in terms of fast and slow sorption process and consider the combination of two first-order rate functions. The other empirical kinetic equations are: the pseudo-second-order kinetic equation (PSOE), Elovich equation and the stretched exponential equation (SE). Two of the four equations are suitable to describe the kinetics of methane and carbon dioxide sorption and have been successfully used to quantify the observed dilatometric phenomena rates. The stretched exponential equation gave the best fit to the experimental data.

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Section: Introductionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Kinetics of methane and carbon dioxide sorption and sorption–induced expansion of coal – kinetic equations assessment

et al. 2016

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“…The maceral (Ceglarska-Stefańska and Brzóska 1998; Crosdale et al 1998;Laxminarayana and Crosdale 2002;Busch et al 2003;Mastalerz et al 2004;Chang et al 2006;Busch et al 2006;Qin et al 2007;Majewska and Ziętek 2007;Siemons et al 2007;Chang et al 2008;Day et al 2008;Mazumder and Wolf 2008;Pone et al 2009;Majewska et al 2009;Radliński et al 2009;Battistutta et al 2010;Gensterblum et al 2010;Day et al 2011;Kim et al 2011;Jiang et al 2012;Maphala and Wagner 2012;An et al 2013;Cai et al 2013a, b;Lin et al 2013;Dutka et al 2013;Xiao et al 2016) include Vitrinite, Inertinite, Exinite. The common indicators are: moist mineral matter basis, and moist mineral matter-free basis (mmf).…”

Section: Methodsmentioning

confidence: 99%

“…Ultimate analysis specifies the elements of carbon, hydrogen, nitrogen, oxygen and sulphur Joubert et al 1973;Nandi and Walker 1975;Nelson et al 1980;Reucroft and Yang and Saunders 1985;Reucroft and Patel 1986;Banerjee 1988;Giuliani et al 1991;DeGance et al 1993;Chaback et al 1996;Fitzgerald et al 2005;Chang et al 2006;Qin et al 2007;Siemons et al 2007;Chang et al 2008;Majewska et al 2009;Radliński et al 2009;Pone et al 2009;Battistutta et al 2010;Gensterblum et al 2010;Kim et al 2011;Hao et al 2012Hao et al , 2013Lin et al 2013). Widely-used indexes for ultimate analysis are: dry ash-free basis, air dried basis.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 9 shows that, the relationship between vitrinite and vitrinite reflectance is expressed as Eq. (31) Chang et al 2006;Qin et al 2007;Chang et al 2008;Hao et al 2012;Zheng 2012;Jiang et al 2012;Gao 2012;Lin et al 2013)-266, English (Mahajan andWalker 1971;Bhattacharyya 1972;Joubert et al 1973;Joubert et al 1974;Banerjee 1988;Yalçin and Durucan 1991;DeGance et al 1993;Chaback et al 1996;Clarkson et al 1997;Crosdale et al 1998;Ö zgen Karacan and Okandan 2000;Laxminarayana and Crosdale 2002;Weishauptová et al 2004;Fitzgerald et al 2005;Dai et al 2006;Saghafi et al 2007;Majewska and Ziętek 2007;Faiz et al 2007a, b;Siemons et al 2007;Yu et al 2008a, b, c;Zhang 2008;Dutta et al 2008;Day et al 2008;Majewska et al 2009;Kędzior 2009;Pini et al 2009;Pone et al 2009;Battistutta et al 2010;Pan et al 2010;Gensterblum et al 2010;He et al 2010;Kim et al 2011;…”

Section: Vitrinite Content Effect On Adsorption Capacitymentioning

confidence: 99%

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Effects of coal rank on physicochemical properties of coal and on methane adsorption

Cheng

Jiang

Zhang

et al. 2017

Int J Coal Sci Technol

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For the thorough research on coal metamorphism impact on gas adsorption capacity, this paper collected and summarized parameters of experimental adsorption isotherms, coal maceral, proximate analysis and ultimate analysis obtained from National Engineering Research Center of Coal Gas Control and related literatures at home and abroad, systematically discussed the coal rank effect on its physicochemical properties and methane adsorption capacity, in which the coal rank was shown in Vitrinite reflectance, furthermore, obtained the Semi-quantitative relationship between physicochemical properties of coal and methane adsorption capacity.

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Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Zhang

et al. 2019

Energy Science & Engineering

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Wettability modification of coal rock may cause serious change in the methane adsorption/desorption behaviors. Thus, the contact angle measurement and isothermal adsorption/desorption experiment of raw coal and samples treated with surfactants (STS) were conducted to investigate the wetting properties and methane adsorption/desorption characteristics. The results indicated that the long‐flame coal (LFC) has the good hydrophilicity itself, and there was no evident sign of saturated adsorption for different samples at relatively low‐pressure (<8 MPa) stage. The sample treated with the wettability reversal agent (G502) had the larger methane adsorption capacity than the wetted samples (LAS, JFC, and 6501), with the latter facilitating the methane desorption. Additionally, the adsorption capacity of the air‐dried samples was stronger than that of the water‐containing samples, including the moisture‐equilibrated, LAS, JFC, and 6501, reflecting that the better the hydrophilicity, the weaker the methane adsorption. Besides, the desorption hysteresis rate of the same sample was mainly controlled by pressure, i.e. the desorption hysteresis indicated a logarithmic decrease with the increasing pressure, but the STS clearly showed the desorption hysteresis to varying degree due to the wettability differences. The pressure drop in the low‐pressure stage was difficult to drive the adsorbed methane to immediately desorb from the matrix surface, whereas even caused further adsorption or re‐adsorption, meaning that the coal required a greater depressurization to enter the effective desorption stage. Finally, the positive implications of wettability modification including enhancing CBM recovery, as well as coal and methane outburst prevention and coal dust control in the mining industry were discussed.

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Interpretation of carbon dioxide diffusion behavior in coals

Cited by 85 publications

References 17 publications

Kinetics of methane and carbon dioxide sorption and sorption–induced expansion of coal – kinetic equations assessment

Kinetics of methane and carbon dioxide sorption and sorption–induced expansion of coal – kinetic equations assessment

Effects of coal rank on physicochemical properties of coal and on methane adsorption

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

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