Stability of lower limit of air pressure in abandoned coal mine roadways during long-term CAES

Frontiers in Ecology and Evolution

Ecology and Evolution

ZhiGuo Li¹  Xiaokui Yu¹  Jian Jiang¹  Jianxun Wu²  Qili Lin³  Pengyu Guo⁴  Jitao Wu⁴ 

[1] East China Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group Co., Ltd, Shanghai, China;East China Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group Co., Ltd, Shanghai, China;School of Resource and Safety Engineering, Chongqing University, Chongqing, China;Engineering Technology Institute for Energy Storage of China Power Engineering Consulting Group Co., Ltd, Shanghai, China;School of Resource and Safety Engineering, Chongqing University, Chongqing, China;

关键词: abandoned coal mine;    CAES;    lower limit of air pressure;    roadway deformation;    plastic zone;    stability;   

DOI  :  10.3389/fevo.2023.1196749

 received in 2023-03-30, accepted in 2023-05-30,  发布年份 2023

来源: Frontiers

【 摘 要 】

Power supply instability in the grid has been exacerbated by the rapid development of new energy generation methods. Notably, large-scale energy storage is the most practical solution to this problem. Meanwhile, in China, an effective method of reusing the increasing number of abandoned coal mines is urgently required. Accordingly, building compressed air energy storage (CAES) plants along the roadways of abandoned coal mines can serve as a viable energy storage method while repurposing these mines. This study examined the effect of the lower limit of air pressure (LLAP) on the stability of coal mine roadways in CAES applications by considering an ongoing pilot CAES coal mine in Chongqing, China. The findings indicate that the LLAP has a positive correlation with the roadway stability provided the frequency of air injection/extraction and upper limit of air pressure are constant. Over 10 years of CAES operation, a higher LLAP corresponds to less overall deformation of the roadway and top slab subsidence, and smaller plastic zone volume. Furthermore, the first main principle stress also decreases as the LLAP increases. According to the findings of this paper, the LLAP for the actual operation of CAES should be adjusted upwards as appropriate, which help to improve the geological stability of CAES roadways.

【 授权许可】

Unknown   
Copyright © 2023 Jiang, Guo, Yu, Lin, Li, Wu and Wu.