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

Cheng, Yuanping; Jiang, Haina; Zhang, Xiaolei; Cui, Jiaqing; Song, Cheng; Li, Xuanliang

doi:10.1007/s40789-017-0161-6

Cited by 64 publications

(36 citation statements)

References 91 publications

(201 reference statements)

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“…In the Anhe coalfield, the coals have similar metamorphism degree when A ad <9%. It is basically consistent with previous studies that the existence of ash reduces the storage space of methane, and thus leads to a reduction of the methane adsorption (Cheng et al, 2017;Laxminarayana and Crosdale, 2002). When A ad > 9%, the R o,max values of the coal samples marked with red color in Figure 10 are significantly higher than those of the samples marked with blue color.…”

Section: Influencing Factors On the Methane Adsorption Capacity Of Coalssupporting

confidence: 92%

Methane adsorption characteristics and its influencing factors of the medium-to-high rank coals in the Anyang-Hebi coalfield, northern China

Zhao

Shao

Hou

et al. 2018

Energy Exploration & Exploitation

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The variation of coal rank in the Anyang-Hebi (Anhe) coalfield has the phenomenon of anti-Hilt law, which makes the coalfield distinctive for coalbed methane exploration research. The methane adsorption characteristics and influencing factors of the medium-to-high rank coal samples of the Shanxi Formation in this coalfield were analyzed. The results indicate that the Langmuir volume (V L) of coals in the shallow western part of the Anhe coalfield is generally higher than that in the deep eastern part. The coal rank and the coal macerals are the dominant factors that influence the methane adsorption capacity of coals in this anti-Hilt law area. The methane adsorption capacity, represented by V L , first increases and then decreases with the coal rank, and the highest V L value corresponds to the maximum vitrinite reflectance of $2.1%. The adsorption capacity has a positive correlation with the vitrinite and the moisture content, a negative relationship with the inertinite content. In general, the adsorption capacity of coal samples shows a "V-shaped" change with the ash yield, and the lowest V L value corresponds to the ash yield of $9%. A prediction model of the gas content of the Anhe coalfield was proposed based on changes of the methane adsorption capacity and principal component analysis.

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Section: Influencing Factors On the Methane Adsorption Capacity Of Coalssupporting

confidence: 92%

Methane adsorption characteristics and its influencing factors of the medium-to-high rank coals in the Anyang-Hebi coalfield, northern China

Zhao

Shao

Hou

et al. 2018

Energy Exploration & Exploitation

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“…This progressive increment in gas content with carbon shows the potentiality of coal seams. This poor correlation may be explained in a way that the gas content increases slowly at low carbon content stage (Cheng et al 2017). Another encouraging fact is that gas content decreases with increase in volatile matter (dry ash free) (Fig.…”

Section: Linear Correlation Between Gas Content and Composition Of Coalmentioning

confidence: 97%

Laboratory investigation of coal characteristics from Tikak Parbat formation of North-East India for coal bed methane study

Banik

2020

J Petrol Explor Prod Technol

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The increasing demand for cleaner source of energy forces India to explore various energy sources, and in this process, coal bed methane gas attracts lot of attention for its favourable characteristics including abundance of coal, clean gas, mitigation of greenhouse gases, reduction in hazard in mines, etc. However, the challenge faced during exploration and production varies from depth of seam, heterogeneity in coal characteristics, rank, sorption capacity, saturation, etc. So the detail analysis of various properties is important for economical extraction of gas. The present paper investigates coal properties and their influence on coal bed methane potentiality. Samples from core wells have been analysed in laboratory using proximate and ultimate analyser. Linear correlations between coal constituents and vitrinite reflectance as well as sorption capacity of coal have been established statistically. Mutual relations among proximate parameters are developed.

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“…With the coal resources gradually entering the deep mining, under the complex environment of "three high and one disturbance", the coal and rock are more likely to break and lose stability, leading to more dynamic disasters such as rockburst and coal and gas outburst (Cheng et al 2017;Fan et al 2019Fan et al , 2020Yuan, 2015Yuan, , 2016Xie et al 2017;Zhao et al 2018). Moreover, in recent years, the coal-gas compound dynamic disaster, which shows both the characteristics of coal gas outburst and rockburst, has attracted more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission response characteristics of anthracitic coal under uniaxial compression

Wang

Zhang

et al. 2020

Preprint

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The damage evolution of coal is accompanied by the generation of acoustic emission (AE) signal. Through the analysis and research of AE response characteristics of coal deformation and failure, it is helpful to reveal the initiation, propagation and fracture evolution of micro cracks in coal. In this work, taking the anthracite coal as research object, the basic mechanical parameters of coal samples were obtained by ultrasonic tests and uniaxial compression experiments. Meanwhile, the AE response characteristics of coal samples during uniaxial compression were obtained through AE experiments. The results show that when the density is low, the wave velocity of coal sample decreases with the increase of density. When the density is higher than a certain value, the wave velocity of coal sample increases with the increase of density. Through the measurement of ultrasonic wave velocity, it is found that there are some non-uniformity and anisotropy in raw coal samples. The distribution of ring count, energy count and AE events with time in uniaxial compression process is approximately normal distribution. The AE events are concentrated in the elastic stage and yield stage, and the energy amplitude of AE events is higher in the plastic stage. Compared with the ring count and energy count, the AE events have good positioning function, which can better reflect the evolution of internal cracks in coal samples during uniaxial compression.

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

Cited by 64 publications

References 91 publications

Methane adsorption characteristics and its influencing factors of the medium-to-high rank coals in the Anyang-Hebi coalfield, northern China

Methane adsorption characteristics and its influencing factors of the medium-to-high rank coals in the Anyang-Hebi coalfield, northern China

Laboratory investigation of coal characteristics from Tikak Parbat formation of North-East India for coal bed methane study

Acoustic emission response characteristics of anthracitic coal under uniaxial compression

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