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| Air tightness and mechanical characteristics of polymeric seals in lined rock caverns(LRCs) for compressed air energy storage(CAES)#br# |
| ZHOU Yu1，2，XIA Caichu1，3，ZHOU Shuwei1，ZHANG Pingyang1 |
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Guizhou Bridge Construction
Research Institute Co.，Ltd.，Guiyang，Guizhou 550001，China；3. College of Civil Engineering，Shaoxing
University，Shaoxing，Zhejiang 312000，China) |
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Abstract A polymeric seal is the critical structure for high-pressure air storage in lined rock caverns(LRCs) for compressed air energy storage(CAES). However，the air tightness and mechanical characteristics of polymeric seals under operational conditions are still unclear. Some problems，such as whether air leakage occurs and how much high pressure air permeates，are unsolved. In this paper，the permeabilities of four types of polymer(IIR，EPDM，NR，FRP) were measured by a self-developed equipment for high pressure gas test，and mechanical parameters of the polymers were also measured. The governing equations of the multi-physical coupling process in CAES caverns were proposed and validated by the in-situ test data of Huntorf plant and a Japan pilot cavern. The air tightness and mechanical characteristics of polymeric seals under operational conditions were calculated and analyzed using the experimental data and governing equations. Results show that a certain degree of air leakage occurs through three types of polymeric seals(IIR，EPDM，NR) except FRP. Nevertheless，all polymeric seals(IIR，EPDM，NR，FRP) meet the requirements in terms of air tightness and mechanical stability. Among these four type polymers，IIR and FRP are preferred materials for internal seals in LRCs. It is also indicate that the proposed governing equations are capable of effectively obtaining accurate responses of LRCs for CAES.
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2018, Vol. 37 
