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

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

机构地区：[1]Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Geomechanics and Geotechnical Engineering,Wuhan 430071,China [4]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China [5]PowerChina Huadong Engineering Corporation Limited,Hangzhou 310014,China

出　　处：《International Journal of Mining Science and Technology》2024年第3期305-321,共17页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.42272321);Hubei Provincial Key Research Projects(Nos.2022BAA093 and 2022BAD163);Major Scientific and Technological Special Project of Jiangxi Province(No.2023ACG01004);WSGRI Engineering&Surveying Incorporation Limited(No.6120230256)。

摘　　要：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 polymer(NOSP)as a sealant,coupled with an air seepage evaluation model that incorporates Knudsen diffusion.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 7–10μm thick NOSP layer.Specifically,under a 0.5 MPa pulse pressure,the permeability decreased to less than 1 n D,and under a 4 MPa pulse pressure,it ranged between4.5×10^(-6)–5.5×10^(-6)m D,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 10μm,applied to substrates with less than 3%porosity.This study provides new insights into air transport and sealing mechanisms at the pore level,proposing NOSP as a cost-effective and simplified solution for CAES applications.

关 键 词：Compressed air energy storage LINING Permeability Transient pulse method Hard rock cavern Nano-grade organosilicon polymer coating 

分 类 号：TQ317[化学工程—高聚物工业]