Impact of inherent moisture on the methane adsorption characteristics of coals with various degrees of metamorphism

Chen, Mingyi; Wang, Chenghao; Li, Haoran; Wang, Liang; Jin, Kan; Dong, Jun

doi:10.1016/j.jngse.2018.05.018

Cited by 76 publications

(45 citation statements)

References 35 publications

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“…The equilibrium moisture content (ie, the maximum inherent moisture content) represents the water-holding capacity of coal. 48 Combined with the research of Yao et al, 70 the Figure 12C,F, respectively. Except for sample YZG2, both D 2 (N 2 ) and D 2 (H 2 O) are positively correlated with the equilibrium moisture content of coal.…”

Section: Relationship Between the Fractal Dimension And Adsorption supporting

confidence: 56%

“…Following MT/T752-1997, methane adsorption tests of dried coal samples with sizes of 0.2-0.25 mm were conducted using high-pressure volumetric equipment. The procedures of the above tests are described in An et al 47 and Chen et al 48 The results of the proximate analysis, methane adsorption constant, and coal rank for the coal samples are shown in Table 1.…”

Section: Sample Characterizationmentioning

confidence: 99%

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Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods

Chen

Yang

Gao

et al. 2020

Energy Science & Engineering

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Coal seam is a sedimentary body with complex pore system. The gas adsorption property of coal is greatly determined by the adsorption‐pores (<100 nm), and the fractal dimension can be used an index to estimate the impact of the adsorption‐pores on the methane adsorption capacity of various rank coals. In this paper, low‐temperature N2 adsorption and H2O adsorption methods were used to study the adsorption‐pores structure and its fractal features. The results show that the development of adsorption‐pores closely depends on the coalification, and the degree of pore development exhibits a U‐shaped trend with increasing coal rank. Additionally, the pore size distributions of coal samples from N2 adsorption analysis and H2O adsorption analysis are similar, especially for samples LH7 and WLH8. Fractal analysis indicates that D2(N2) (0.5 < P/P0 < 1) can more accurately characterize the fractal features of adsorption‐pores than D2(H2O), which may be a result of the significant coal‐H2O interaction. Moreover, D2(N2) has stronger correlations with the coal pore parameters. With the increase in D2(N2), the Langmuir volume first decreases and then increases, which is probably associated with the competition effect of the pore structure and surface irregularity of coal. When D2(N2) < 2.7‐2.8, the pore structure plays a key role, while for D2(N2) > 2.7‐2.8, the influence of the specific surface area is more prominent. The equilibrium moisture content of the coal samples also has a positive correlation with D2, except for low‐rank coal sample YZG2 due to the presence of a large amount of oxygen‐containing functional groups, which increases its water‐holding capacity.

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Section: Relationship Between the Fractal Dimension And Adsorption supporting

confidence: 56%

Section: Sample Characterizationmentioning

confidence: 99%

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods

Chen

Yang

Gao

et al. 2020

Energy Science & Engineering

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show abstract

“…Investigation of methane adsorption in moist coals has shown that the coal sample with higher water content also has a higher P L . 101 , 102 Gensterblum believed that P L is related to the adsorption enthalpy, reflecting the interaction between the adsorbent and the adsorbate. 102 , 103 The lower the P L , the greater the affinity between the adsorbent and the adsorbate.…”

Section: Resultsmentioning

confidence: 99%

Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Han

Memon

et al. 2021

ACS Omega

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Adsorption is one of the most important forms of storage of gas in shale reservoirs. Shale gas adsorption in the actual reservoir is not only affected by individual factors such as water content, temperature, and pressure but also by the synergetic effect of these factors. In this study, we conducted laboratory experiments on methane adsorption in dry and wet shale at different pressures and temperatures. The synergetic effect of water content, temperature, and pressure on shale gas adsorption is explored. The results show that increasing temperature weakens the interaction between methane and shale and reduces adsorption capacity due to the exothermic nature of adsorption. Water reduces methane adsorption capacity by occupying adsorption sites and blocking pores in the shale system. Although temperature and water reduce methane adsorption individually, the effect of these two factors weakens each other. Temperature has a more significant effect on methane adsorption in shales with low water content, while water has a more remarkable impact on methane adsorption at a low temperature. Furthermore, the increase in pressure reduces the negative influence of water and temperature on methane adsorption. By quantitatively analyzing the relationship between methane adsorption in dry and wet shales, a predictive adsorption model for wet shale considering the influence of in situ conditions is proposed and validated. Validation shows that the proposed model has high accuracy and broad applicability to shales with different properties.

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“… 15 − 17 The pore structure of coal is very complex, and it contains a large number of visible cracks and nanoscale pores. 18 , 19 Pores and fractures form a complex networked structure, which provides channels and places for gas flow and storage, respectively. 20 , 21 These pore distributions determined the contact of the gasification agent with the carbon matrix during the gasification process and affected the gasification reactivity.…”

Section: Introductionmentioning

confidence: 99%

Co-Gasification of Cow Manure and Bituminous Coal: A Study on Reactivity, Synergistic Effect, and Char Structure Evolution

Wang

Song

et al. 2020

ACS Omega

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As special waste biomass, cow manure (CM) is also the main pollutant in agricultural production. The combination of cow manure and coal is conducive to the sustainable development of energy and the solution to pollution problems. This work aims to investigate the co-gasification reactivity and synergy of cow manure and Meihuajing (MHJ) bituminous coal blends at 800–1100 °C using a thermogravimetric analyzer, and the correlation between char gasification reactivity and its structural characteristics is performed. The results indicate that the sensitivity of gasification reactivity to temperature is gradually weakened with the proportion of CM increasing. The synergistic effect on reactivity was observed in the co-gasification process of CM/MHJ. The addition of CM promoted the synergistic effect obviously at the low carbon conversion level, and the inhibitory effect with the CM addition on the order degree of char carbon structure was enhanced during the co-gasification process according to Raman spectroscopy analysis. The addition of CM promoted the porous structure evolutions, which make the pore size distribution and the specific surface developed remarkable. The changes in carbon and pore structures can be well related to the gasification reactivity. The findings in this study would be helpful in the understanding of the co-gasification synergy mechanism of cow manure and coal blends.

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Impact of inherent moisture on the methane adsorption characteristics of coals with various degrees of metamorphism

Cited by 76 publications

References 35 publications

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods

Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Co-Gasification of Cow Manure and Bituminous Coal: A Study on Reactivity, Synergistic Effect, and Char Structure Evolution

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Impact of inherent moisture on the methane adsorption characteristics of coals with various degrees of metamorphism

Cited by 76 publications

References 35 publications

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N2 and H2O adsorption methods

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N2 and H2O adsorption methods

Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Co-Gasification of Cow Manure and Bituminous Coal: A Study on Reactivity, Synergistic Effect, and Char Structure Evolution

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Product

Resources

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Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods

Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N₂ and H₂O adsorption methods