報告書番号

U01024

タイトル（和文）

神岡実験場における水封式圧縮空気貯蔵技術の実証 --実験場の水理地質特性と適性--

タイトル（英文）

Demonstration study for the compressed air energy storage technology by the hydraulic confining method at the Kamioka testing site -Hydrogeological characterization and aptitude of the testing site-

概要 （図表や脚注は「報告書全文」に掲載しております）

わが国の電力負荷パターンは変動が大きく，省エネルギーの観点からも負荷平準化が必要とされている。期待される電力貯蔵技術として圧縮空気貯蔵（CAES）ガスタービン発電が挙げられる。わが国では，水封式での貯蔵が合理的と考えられる。水封式CAESを実現するには，我が国の地質，水理特性を考慮した横坑による圧縮空気貯蔵実験により，この貯蔵方式を実証しておく必要がある。このため約2MPaの地下水圧での実証実験を計画した。本研究では，実験用空洞箇所の地質，透水性および地下水圧分布などを調査し，実験用空洞周辺の水理地質構造を明らかにすることにより，貯蔵実験用空洞がCAES貯槽空洞として必要な条件を満足しており，また実験場としての適性があることを確認した。

概要 （英文）

The peak shaving of electric power is desired, because the electric load pattern fluctuates remarkably in Japan. For this reason a system of the compressed air energy storage (CAES) with the gas turbine power generator is expected to be one of effective ways to transfer the off-peak electric power. In order to make the CAES system more economical and more feasible in the techniques of civil engineering in Japan, a large amount of the highly compressed air should be stored in the deeply excavated caverns without lining. Groundwater surrounding the storage cavern will prevent the stored air from leaking within it. Considering the hydrogeological characteristics and the hydrology of rock mass in Japan, it is necessary to confirm the ability to store the compressed air by the demonstration test in the cavern. For this reason, it was planned to perform the field storage test in the cavern with the underground water pressure, about 2 MPa. In this study, we examined geology, permeability and underground water pressure distribution in and around the test cavern. Subsequently, the aspects of the hydrogeological structure were clarified. These results led to the confirmation that the geology, rock quality and hydrology in and around the test cavern were appropriate to the necessary conditions for the CAES storage cavern and were suitable for the demonstration test.

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