成果報告書詳細
管理番号20130000000790
タイトル*平成24年度中間年報 風力等自然エネルギー技術研究開発 海洋エネルギー技術研究開発 海洋エネルギー発電システム実証研究(空気タービン式波力発電)
公開日2013/10/22
報告書年度2012 - 2012
委託先名三菱重工鉄構エンジニアリング株式会社 東亜建設工業株式
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Demonstration research on Power Generation System using Ocean Energy -- Wave Power Generation System with Oscillating Water Column (OWC) ---
(FY2011-FY2012)

FY2012 Annual Report

Summary:

Among the various wave power conversion systems, Oscillating Water Column System (OWC) has a long history of R/D, which provides its technical problems for practical use. Though incident waves bring energy with wide range of wave period, the primary conversion of conventional systems from wave to air flow was attained high efficiency only under the narrow band of wave period. Offshore mooring system was relatively expensive especially in the sea with rough wave climate. We, six private companies and research institutes & universities, started a consortium research for practical use of OWC in 2011 with the financial support from Japanese NEDO.
Hydraulic experiments with small and large scales (S:1/25 - 1/7) were conducted to improve the primary conversion from wave to air flow for wider range of incident wave periods. Projecting-walls installed both side of opening proved to make frequency dependency reduced. Under the projecting-wall attached, we found double peaks of resonance for the airflow extraction against wave period. In the large scale experiment, wave pressure was measured at walls and air-chambers as well as facility front to confirm the facility safety and stability against the strong waves of 50 years return period. This confirmation is necessary for attaching the facility to the existing breakwater. Aerodynamic experiments were also conducted to design high conversion turbine system adopting an impulse turbine for reciprocating current. The impulse turbine system shows high conversion efficiency from airflow to electricity for the wide range of air flow rate. This impulse turbine provides high torque under even slow rotation rate with less noise.
Expenses were cut down by unitizing facility installed on to the existing breakwater. Maintenance cost was minimized by installing the turbine and generator in dry atmosphere above the water level.
By combining our effort of improving total efficiency of energy extraction from fluctuating natural waves, with that of cutting down on expenses of total system, we can show our system of Multi Resonance OWC generates electricity at the unit price of 40Yen/kWh in Sakata Port.
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