首页|A novel nano-grade organosilicon polymer:Improving airtightness of compressed air energy storage in hard rock formations

A novel nano-grade organosilicon polymer:Improving airtightness of compressed air energy storage in hard rock formations

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Enhancing cavern sealing is crucial for improving the efficiency of compressed air energy storage(CAES)in hard rock formations.This study introduced a novel approach using a nano-grade organosilicon poly-mer(NOSP)as a sealant,coupled with an air seepage evaluation model that incorporates Knudsen diffu-sion.Moreover,the initial coating application methods were outlined,and the advantages of using NOSP compared to other sealing materials,particularly regarding cost and construction techniques,were also examined and discussed.Experimental results indicated a significant reduction in permeability of rock specimens coated with a 7-10 μm thick NOSP layer.Specifically,under a 0.5 MPa pulse pressure,the permeability decreased to less than 1 nD,and under a 4 MPa pulse pressure,it ranged between 4.5×10-6-5.5×10-6 mD,marking a 75％-80％decrease in granite permeability.The sealing efficacy of NOSP surpasses concrete and is comparable to rubber materials.The optimal viscosity for application lies between 95 and 105 KU,and the coating thickness should ideally range from 7 to 10 μm,applied to sub-strates with less than 3％porosity.This study provides new insights into air transport and sealing mech-anisms at the pore level,proposing NOSP as a cost-effective and simplified solution for CAES applications.

Compressed air energy storageLiningPermeabilityTransient pulse methodHard rock cavernNano-grade organosilicon polymer coating

Zhuyan Zheng、Guibin Wang、Chunhe Yang、Hongling Ma、Liming Yin、Youqiang Liao、Kai Zhao、Zhen Zeng、Hang Li、Yue Han

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Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

University of Chinese Academy of Sciences,Beijing 100049,China

State Key Laboratory of Geomechanics and Geotechnical Engineering,Wuhan 430071,China

State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China

PowerChina Huadong Engineering Corporation Limited,Hangzhou 310014,China

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国家自然科学基金Hubei Provincial Key Research ProjectsHubei Provincial Key Research ProjectsMajor Scientific and Technological Special Project of Jiangxi ProvinceWSGRI Engineering & Surveying Incorporation Limited

422723212022BAA0932022BAD1632023ACG010046120230256

2024

10.1016/j.ijmst.2024.02.003

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2024.34(3)
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