Material composition, pore structure and adsorption capacity of low-rank coals around the first coalification jump: A case of eastern Junggar Basin, China

Tao, Shu; Chen, Shida; Tang, Dazhen; Zhao, Xu; Xu, Hao; Li, Song

doi:10.1016/j.fuel.2017.09.087

Cited by 207 publications

(119 citation statements)

References 32 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…Compared to those in other countries, coal seams in China have low formation pressure, low permeability, and low gas saturation . High‐stress blocks, tectonic coal blocks, ultralow permeability coal blocks, and deep difficult‐to‐recover coal blocks account for over 75% of the total resources and cannot be effectively produced using conventional techniques in China…”

Section: General Problems Of China's Cbm Industrymentioning

confidence: 99%

“…Compared to those in other countries, [43][44][45][46][47][48][49][50][51][52][53] coal seams in China have low formation pressure, low permeability, and low gas saturation. [54][55][56][57][58][59] High-stress blocks, 60 tectonic coal blocks, 61,62 ultralow permeability coal blocks, 24,63 and deep difficult-to-recover coal blocks 64,65 account for over 75% of the total resources and cannot be effectively produced using conventional techniques in China. [66][67][68] For many years, the implementation of science and technology support projects such as the national "863" plan, the "973" plan, the high-tech industrialization demonstration projects, and the National Science and Technology Major Projects have resulted in the development of a number of scientific and technological achievements, and the results of these projects have solved some problems in the exploration, development, transportation, and utilization of normal CBM.…”

Section: Exploration and Development Technology Need A Breakthroughmentioning

confidence: 99%

See 1 more Smart Citation

Current status, challenges, and policy suggestions for coalbed methane industry development in China: A review

Tao

Chen

Pan

2019

Energy Science & Engineering

Self Cite

215

116

View full text Add to dashboard Cite

China is vigorously promoting the development of coalbed methane (CBM) resources because CBM is cleaner than coal and a hazardous gas in coal mining. However, the CBM production in China is significantly lower than that in other coal‐rich countries, such as Australia and the United States. In this paper, the main problems hindering CBM development in China are discussed to provide management suggestions for the government. These key problems include exploration and development techniques, the overlap of mining rights, management, financial supporting policy, investment environment, regulations, and market conditions. The results of this study indicate that to improve the development of the CBM industry in China, national and local governments must enact specific and exercisable regulations to increase financial support, improve technology, increase investment in CBM exploration, strengthen public project establishment, and improve the reform of CBM exploration and development policies.

show abstract

Section: General Problems Of China's Cbm Industrymentioning

confidence: 99%

Section: Exploration and Development Technology Need A Breakthroughmentioning

confidence: 99%

Current status, challenges, and policy suggestions for coalbed methane industry development in China: A review

Tao

Chen

Pan

2019

Energy Science & Engineering

Self Cite

215

116

View full text Add to dashboard Cite

show abstract

“…Currently, China has initially achieved the large‐scale commercial development of high‐rank CBM in the Qinshui Basin and the eastern edge of the Ordos Basin, compared to the low‐rank coal development area of the Junggar Basin, the Tarim Basin, the Ordos Basin, etc The research on the basic theory of CBM geology and exploration in the low‐rank coal has been left behind . The material composition, pore structure, surface chemistry, and other properties in low‐rank coals are clearly distinguished from high‐rank coals, and the former usually shows short but concentrates methane adsorption equilibrium, especially the higher initial desorption rate and desorption efficiency . However, there are also problems of lower gas content, higher water content, stronger chemical activity, and lower gas production and recovery for low‐rank coals …”

Section: Introductionmentioning

confidence: 99%

“…4 The material composition, pore structure, surface chemistry, and other properties in low-rank coals are clearly distinguished from high-rank coals, and the former usually shows short but concentrates methane adsorption equilibrium, especially the higher initial desorption rate and desorption efficiency. [5][6][7][8][9][10][11] However, there are also problems of lower gas content, higher water content, stronger chemical activity, and lower gas production and recovery for low-rank coals. [12][13][14][15] The key point of improving CBM recovery is to reasonably allocate the methane supply capacity and seepage ability.…”

mentioning

confidence: 99%

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

Zhang

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

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.

show abstract

“…A large number of laboratory studies have been carried out by scientists in China and overseas on the adsorption characteristics of coal [21][22][23][24][25][26]. The pore structure of coal [27,28], the adsorption characteristics of gas [29], the pore volume, and specific surface area of coal determine the adsorption performance of coal to some extent. At the same time, the water content, the microscopic composition of the coal, the temperature, and pressure have a great influence on the adsorption characteristics of the coal.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Coal Damage Characteristics of Adsorption-Instantaneous Pressure Relief in Coal Containing Gases with Different Adsorption Characteristics

Sun

Guo

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

In the process of coal mining, coal and gas outburst is one of the most severe disasters, which is accompanied by the outbursts of CO 2 , CH 4 , N 2 , and other gases. Since the intensity of the outburst is affected by the adsorption characteristics of different gases, the study of the adsorption characteristics of multi-gas in the coal body is of great significance for the prevention and control of coal and gas dynamical outbursts in coal mining. In this paper, the self-developed adsorption-instantaneous pressure relief test system for gas-containing coal was used to study the damage characteristics of multi-gas in briquette adsorption-instantaneous pressure relief and to characterize coal adsorption expansion deformation and instantaneous pressure relief deformation quantitatively. The results showed that under the same temperature and pressure conditions, the adsorption expansion deformation capacities of different gases were in the order of CO 2 > CH 4 > N 2 . With the increasing pressure of pressure relief, the damage of the coal body tended to be more significant. Although the briquette exhibited isotropic mechanical properties, the process of adsorption expansion deformation was not completely consistent with the isotropy of deformation, in which the axial strain was slightly larger than the radial strain. Moreover, it was found that the adsorption equilibrium time was positively correlated with gas pressure and gas adsorption characteristics.

show abstract

Material composition, pore structure and adsorption capacity of low-rank coals around the first coalification jump: A case of eastern Junggar Basin, China

Cited by 207 publications

References 32 publications

Current status, challenges, and policy suggestions for coalbed methane industry development in China: A review

Current status, challenges, and policy suggestions for coalbed methane industry development in China: A review

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

Experimental Study on the Coal Damage Characteristics of Adsorption-Instantaneous Pressure Relief in Coal Containing Gases with Different Adsorption Characteristics

Contact Info

Product

Resources

About