Analysis of Underground Reservoir Capacity in Goaf and Case Study of Pumped Storage

  • Liao Qinglong ,
  • Yang Fan ,
  • Li Yongfu ,
  • Jiang Deyi ,
  • Wang Qian
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  • 1. State Grid Chongqing Electric Power Research Institute, Chongqing 401121, P.R. China;
    2. State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, Chongqing 400044 P.R. China

Received date: 2024-08-22

  Online published: 2025-05-06

Abstract

In order to realize the "Double Carbon" strategy, the state is gradually taking measures to reduce the proportion of coal-fired thermal power and increase the use of clean energy such as solar energy and wind energy. In recent years, due to the temporal and spatial uncertainty of renewable energy and the lack of large-scale energy storage facilities, the phenomenon of abandoning wind and power (abandonment of light) is becoming more and more serious. In order to improve the utilization rate of wind and solar energy, it is proposed to use abandoned coal mine goafs as an underground large-scale pumped hydro storage reservoir in areas rich in solar and wind energy to promote the combined use of available energy. The storage capacity of the goaf as a large-scale pumped hydro storage reservoir is analyzed from the aspects of storage capacity, usable capacity and gas-liquid exchange in the goaf. Combined with the characteristics of goaf and related meteorological characteristics of typical abandoned coal mines in China, the energy storage characteristics of underground reservoirs in goaf are analyzed. It has been found that using abandoned coal mine goafs to develop pumped hydro storage plants is technically feasible in wind and solar-rich northwestern and southwestern China.

Cite this article

Liao Qinglong , Yang Fan , Li Yongfu , Jiang Deyi , Wang Qian . Analysis of Underground Reservoir Capacity in Goaf and Case Study of Pumped Storage[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(2) : 709 -719 . DOI: 10.20174/j.JUSE.2025.02.38

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