離島インフラ生産のための海洋深層水複合利用洋上浮体施設(Offshore Complex Float Utilizing DOW as Infra-structure of Isolated Island )
- 標題
- 離島インフラ生産のための海洋深層水複合利用洋上浮体施設(Offshore Complex Float Utilizing DOW as Infra-structure of Isolated Island )
- 作者
- 大内 一之, 實原 定幸, 渡辺 敬之(Kazuyuki Ouchi, Sadayuki Jitsuhara and Takayuki Watanabe)
- 文件屬性
- 日本研究
- 知識分類
- 基礎研究
- 出版年
- 2012
- 刊名
- 海洋深層水研究
- 卷
- 13
- 期
- 1
- 頁
- P17-24
- 點閱數
- 2500
摘要
水深200m 以深の海洋水は海洋深層水と呼ばれ，今まで人類が利用してきた表層海水に比べて， 低温性・富栄養性・清浄性という3 大特徴を有しており，全海水の95％を占め，しかも極海や寒 帯海域での沈み込みと海洋大循環によって再生されるほぼ無尽蔵な資源である． この海洋深層水を 原料として利用し，その低温性から熱ェネルギーを取り出し海洋温度差発電（OTEC）を行う，富 栄養性を肥料として光合成を促進し植物プランクトンを増殖させ漁場を造る，清浄性を利用し清浄 な淡水を生産する等の，人類の今後の課題を解決する新しい基礎的資源の調達方法が考えられる． ここでは，このような海洋深層水の複合的大規模利用によるエネルギー・食糧・淡水等の基礎的資 源生産ィンフラとしての，「洋上浮体施設」の構想及びその概念設計を行い，その実現性について 考察する．
DOW (Deep Ocean Water: sea water below 200 m depth) which has three major character-istics of Low Temperature, Rich Nutrient and Very Clean, is expected to emerge as a future renewable ocean resource. Towards the era emphasizing clean environment and low carbon, utilizing renewable ocean resources is absolutely important because the land-based resources are being depleted. In order to use DOW effectively and economically, multi-purpose utiliza-- tion of DOW is recommended. First, electric power generation by OTEC (Ocean Thermal Energy Conversion) is carried out using the difference of water temperature between the cold DOW (5C) and the warm surface water (25C). Second, fresh water generation by de-- salination of the sea water is carried out using the residual difference of temperature after OTEC operation. Third, DOW released from the heat exchanger of fresh water generators can be scattered into the photosynthetic surface layer of the sea where its nutrients can enhance marine primary production and eventually support rich fishing grounds. Fourth, lithium and some other rare metals can be absorbed from DOW by putting special filters in the continu-- ous large quantity flow of DOW. In this paper, the multi-purpose DOW platform which gen-erates electric power, fresh water, support fisheries and lithium absorption from DOW and surface water is proposed as a viable infra-structure for an isolated island. Technical and eco-- nomic feasibility study was carried out and suggests that an optimally sized multi-purpose DOW platform is very feasible for the future environmentally sensitive times.
DOW (Deep Ocean Water: sea water below 200 m depth) which has three major character-istics of Low Temperature, Rich Nutrient and Very Clean, is expected to emerge as a future renewable ocean resource. Towards the era emphasizing clean environment and low carbon, utilizing renewable ocean resources is absolutely important because the land-based resources are being depleted. In order to use DOW effectively and economically, multi-purpose utiliza-- tion of DOW is recommended. First, electric power generation by OTEC (Ocean Thermal Energy Conversion) is carried out using the difference of water temperature between the cold DOW (5C) and the warm surface water (25C). Second, fresh water generation by de-- salination of the sea water is carried out using the residual difference of temperature after OTEC operation. Third, DOW released from the heat exchanger of fresh water generators can be scattered into the photosynthetic surface layer of the sea where its nutrients can enhance marine primary production and eventually support rich fishing grounds. Fourth, lithium and some other rare metals can be absorbed from DOW by putting special filters in the continu-- ous large quantity flow of DOW. In this paper, the multi-purpose DOW platform which gen-erates electric power, fresh water, support fisheries and lithium absorption from DOW and surface water is proposed as a viable infra-structure for an isolated island. Technical and eco-- nomic feasibility study was carried out and suggests that an optimally sized multi-purpose DOW platform is very feasible for the future environmentally sensitive times.