Investigation and comprehensive utilization of resources in closed coal mines in Anhui Province, China

Authors

LIU Feiyue, Anhui Province Key Laboratory of Intelligent and Green Mining of Deep Coal Resources, Anhui University of Science and Technology, Huainan 232001, China; Anhui Engineering Research Centre of Exploitation and Utilization of Closed/Abandoned Mine Resources, Anhui University of Science and Technology, Huainan 232001, ChinaFollow
CHEN Wanyun, Anhui Province Key Laboratory of Intelligent and Green Mining of Deep Coal Resources, Anhui University of Science and Technology, Huainan 232001, China
YANG Ke, Anhui Province Key Laboratory of Intelligent and Green Mining of Deep Coal Resources, Anhui University of Science and Technology, Huainan 232001, China; Anhui Engineering Research Centre of Exploitation and Utilization of Closed/Abandoned Mine Resources, Anhui University of Science and Technology, Huainan 232001, China
DUAN Minke, Anhui Engineering Research Centre of Exploitation and Utilization of Closed/Abandoned Mine Resources, Anhui University of Science and Technology, Huainan 232001, China
LIU Qinjie, Anhui Engineering Research Centre of Exploitation and Utilization of Closed/Abandoned Mine Resources, Anhui University of Science and Technology, Huainan 232001, China
YANG Lingyue, Anhui Engineering Research Centre of Exploitation and Utilization of Closed/Abandoned Mine Resources, Anhui University of Science and Technology, Huainan 232001, China

Abstract

[Objevtive] With the continuously intensive exploitation of coal resources and the structural reform of energy supply, many coal mines in Anhui Province have been closed due to resource depletion or backward production capacity. However, the closed coal mines still host resources such as underground spaces, residual coals, gas, mine water, land, and infrastructure equipment. Hence, reutilizing resources in closed coal mines holds significant engineering value and economic benefits. [Methods] Based on the general information and reutilization status of 59 coal mines in Anhui Province that have been closed since 2013, this study analyzed the distribution characteristics, residual resources, and reutilization potential of these coal mines. A database and a WebGIS cloud platform were developed for these closed coal mines, allowing for their information search, analysis, and visualization. This study explored the Pan-1 and Shitai coal mines as examples, presenting schemes for reutilizing the closed coal mines through residual gas drainage and semi-underground pumped storage. [Results and Conclusions] Key findings are as follows: (1) The closed coal mines in Anhui Province are primarily distributed in the Huainan and Huaibei areas. Some of them feature relatively short closure durations, abundant residual resources, and clear property rights, demonstrating the considerable potential for resource reutilization. (2) For the closed Pan-1 Coal Mine, the implementation of the 3D residual gas drainage technique that combines sealed-wall pressurized drainage, drainage using original boreholes, and drainage through surface drilling enables integrated engineering involving drainage, gas drainage, and resource utilization within the goaf of the closed coal mine while ensuring the safe production of adjacent mines. Consequently, the Pan-1 Coal Mine yielded cumulative gas drainage of 4840 × 10⁴ m³ and power generation of 8590 × 10⁴ kW·h within three years, corresponding to direct economic benefits of 5120 × 10⁴ CNY. (3) For the closed Shitai Coal Mine, its underground space can provide an effective storage capacity of 30 × 10⁴ m³, making it possible to transform into a semi-underground pumped storage power plant with an installed capacity of 35 MW. The case analyses indicate that some of the closed coal mines in Anhui Province manifest technical and economic feasibility in resource reutilization, and further research is required.

Keywords

closed coal mine, WebGIS cloud platform, gas drainage, pumped storage, Anhui Province

DOI

10.12363/issn.1001-1986.23.12.0863

Recommended Citation

LIU Feiyue, CHEN Wanyun, YANG Ke, et al. (2024) "Investigation and comprehensive utilization of resources in closed coal mines in Anhui Province, China," Coal Geology & Exploration: Vol. 52: Iss. 6, Article 2.
DOI: 10.12363/issn.1001-1986.23.12.0863
Available at: https://cge.researchcommons.org/journal/vol52/iss6/2

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