海洋温度差発電実験装置の連続運転におけるスペクトル解析(Spectrum Analysis of OTEC Experimental Plant Under Continuous Operation)
- 標題
- 海洋温度差発電実験装置の連続運転におけるスペクトル解析(Spectrum Analysis of OTEC Experimental Plant Under Continuous Operation)
- 作者
- 森﨑敬史・池上康之・後藤 聡(Takafumi Morisaki , Yasuyuki Ikegami and Satoru Goto)
- 文件屬性
- 日本研究
- 知識分類
- 能源利用
- 出版年
- 2014
- 刊名
- 海洋深層水研究
- 卷
- 14
- 期
- 3
- 頁
- P197-210
- 點閱數
- 2375
摘要
自然ェネルギーのなかでも地熱発電のように安定的な発電が可能な海洋温度差発電（OTEC) が 注目されている． 一方，電力需要や運転条件の変化に対応した最適制御および安定的な運転のため には，OTEC システムの動的モデルや制御システムの構築が必要である． これまで様々な動特性の 研究やシステムモデルが提案されているが，OTEC の高精度な動的モデル構築のための動特性解析 およびスペクトル解析評価などが十分に明らかにされていない． そこで，本研究では，アンモニア ／水を用いた30 kW OTEC 実験装置による連続運転データを解析し，構成機器がサイクルへ及ぼ す影響についてスペクトル解析および各機器の運転特性における相関係数について検討を行った． その結果，温熱源の温度は，タービン入口の作動流体の温度と圧力に，冷熱源の温度および流量は タービン出口の温度と圧力に正の相関が確認された． さらに． 蒸発器における作動流体圧力では， 冷熱源による強い影響がみられた．
The ocean thermal energy conversion (OTEC) system is one of the pro面sing sol吐ions for providing a stable electricity s叩ply and many other by-products. Using ammonia/water mixture (AWM) as a working fluid results in performance improvement of the cycle under the same oper-ating conditions. Though the power generation system using AWM as working fluid has been put into practical use in the waste-heat power generation systems at high heat source temperatures, power即neration using OTEC system at low heat source temperatures has not been verified thoroughly. Previous study has reported the dynamic characteristics and system model. How-ever, the spectrum characteristics analysis to develop models for dynamic and control systems of OTEC is not clear. It is necessary to develop models for dynamic and control systems of OTEC in order to control the system stability and to match the plant's outp吐with electricity demand. As it is of great importance for the design of the system, this paper reports on the spectrum characteristics of the OTEC system outputs. In this study, two weeks of steady operation was performed and the obtained data were analyzed. As a result, it is clarified that the warm water temperature and the working fluid temperature and pressure at the turbine inlet are related to positive correlation The cold water temperature and the working fluid temperature and pressure at the turbine outlet are related to positive correlation. Moreover, the working fluid pressure in the evaporator was found to affect the cold water temperature and flow rate more than the warm water temperature. These results are expected to be useful for the design of dynamic models of the OTEC system.
The ocean thermal energy conversion (OTEC) system is one of the pro面sing sol吐ions for providing a stable electricity s叩ply and many other by-products. Using ammonia/water mixture (AWM) as a working fluid results in performance improvement of the cycle under the same oper-ating conditions. Though the power generation system using AWM as working fluid has been put into practical use in the waste-heat power generation systems at high heat source temperatures, power即neration using OTEC system at low heat source temperatures has not been verified thoroughly. Previous study has reported the dynamic characteristics and system model. How-ever, the spectrum characteristics analysis to develop models for dynamic and control systems of OTEC is not clear. It is necessary to develop models for dynamic and control systems of OTEC in order to control the system stability and to match the plant's outp吐with electricity demand. As it is of great importance for the design of the system, this paper reports on the spectrum characteristics of the OTEC system outputs. In this study, two weeks of steady operation was performed and the obtained data were analyzed. As a result, it is clarified that the warm water temperature and the working fluid temperature and pressure at the turbine inlet are related to positive correlation The cold water temperature and the working fluid temperature and pressure at the turbine outlet are related to positive correlation. Moreover, the working fluid pressure in the evaporator was found to affect the cold water temperature and flow rate more than the warm water temperature. These results are expected to be useful for the design of dynamic models of the OTEC system.