Recent developments in coal mine methane extraction and utilization in China: A review

Zhou, Fang; Xia, Tongqiang; Wang, Xinxin; Zhang, Yifan; Sun, Yajun; Liu, Jishan

doi:10.1016/j.jngse.2016.03.027

Cited by 298 publications

(140 citation statements)

References 29 publications

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“…9 As the CBM accumulation is positively correlated with coal reservoirs, it has distinct characteristic of regional enrichment. 4 In Qinshui Basin, which is the biggest CBM block of Shanxi Province, the CBM reserves buried below less than 2000 m account for one-third of the national total. 4 In Qinshui Basin, which is the biggest CBM block of Shanxi Province, the CBM reserves buried below less than 2000 m account for one-third of the national total.…”

Section: Introductionmentioning

confidence: 99%

A new pattern of underground space‐time tridimensional gas drainage: A case study in Yuwu coal mine, China

Nie

et al. 2019

Energy Science & Engineering

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With the increase of mining depth, the high gassy coal mine confronts with a variety of gas problems, such as gas concentration exceeding the limit in the working face, gas outburst and gas explosion. According to the situation of gas drainage in Qinshui Basin (South of Shanxi Province, China) and enlightened by horizontal directional drillings (HDD) and multi‐branched horizontal wells, a new gas drainage pattern that inverted π‐shape km borehole layout was proposed. Verified in Yuwu Coal Mine, the gas drainage data were standardized via the unified theory of standardization. It could dropped the coal seam gas content to 7.71 m3/t, and increased the gas drainage rate to 34.2%, which conformed to the Chinese regulation (<8 m3/t, >30%, respectively). This pattern has a significant effect on coal mines with a single seam, where protective seam mining technology was unsuitable to prevent gas outburst and gas explosion.

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Section: Introductionmentioning

confidence: 99%

A new pattern of underground space‐time tridimensional gas drainage: A case study in Yuwu coal mine, China

Nie

et al. 2019

Energy Science & Engineering

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“…The effect of increasing seam permeability by deep hole blasting is obvious, but this technique may make later coal mining In China, the two main techniques for increasing seam permeability in underground coal mines are within coal bed and out-of-bed pressure relief. Pressure relief out-of-bed, also called protection layer mining, means mining the coal seam with low or no outburst risk first [16][17][18]. The method is simple, economical, and diminishes much of the gas pressure.…”

Section: Introductionmentioning

confidence: 99%

Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China

Cheng

Xia

et al. 2018

Energies

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Abstract:Coalbed methane (gas) is a high quality and clean resource, but it also causes disasters in coal mines in China. The low permeability of coal seams is the main reason that developing coalbed methane (CBM) as an energy resource is difficult, so increasing coal seam permeability is the key to CBM development in China. In this paper, the principal techniques for seam permeability enhancement are presented. The paper focuses on hydraulic technology for seam permeability enhancement (HTSPE), which is considered an economic and highly efficient technology for seam permeability enhancement. The process of HTSPE development is reviewed and the current status of the theories behind HTSPE and the technology and equipment for its use are summarized. The goal is to identify the gaps in HTSPE research and the problems in its implementation. In the future, integration and diversification of the technologies along with on-board intelligence and miniaturization may be the trends for the equipment. Finally, it is shown that tree-shaped borehole fracturing can be used to develop CBM in underground coal mines. This study could be used as a valuable example for other coal deposits being mined under similar geological conditions.

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“…It is reported that 0.64 million dollars per annum was earned by selling certified emission reduction (CER) generated by one rotary kiln in India, which consumes 4505 tones methane per annum [16]. The electricity generation and safe transportation technologies of low-concentration methane have also been developed to improve the methane utilization rate in China [17,18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions

Wen

Wang

et al. 2018

Energies

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Abstract:The massive emission of low concentrations (≤0.5%) of methane (CH 4 ) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conducted. The results reveal that stable concentrations of methane under segregation and non-segregation states in the enrichment tower gradually increase with height, with a maximum methane concentration of 0.64% and 0.54%, respectively. This shows that the methane enrichment effect in free diffusion conditions is more significant under the segregation state than under the non-segregation state. The stable concentration of methane in the middle and upper sections of the enrichment tower shows an increasing trend. However, the stable concentration of methane in the lower section of the enrichment tower has an increasing trend (less than 0.50%). According to the methane molecule Boltzmann distribution law, methane concentration enrichment decreases with height, and the conversion of the methane from the segregated to non-segregated is irreversible. Consequently, industrial applications of methane enrichment from buoyant forces are not feasible for low concentrations of methane.

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Recent developments in coal mine methane extraction and utilization in China: A review

Cited by 298 publications

References 29 publications

A new pattern of underground space‐time tridimensional gas drainage: A case study in Yuwu coal mine, China

A new pattern of underground space‐time tridimensional gas drainage: A case study in Yuwu coal mine, China

Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China

Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions

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