成果報告書詳細
管理番号20130000000953
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 次世代海洋エネルギー発電技術研究開発(海洋温度差発電)
公開日2013/10/22
報告書年度2012 - 2012
委託先名国立大学法人佐賀大学 株式会社神戸製鋼所
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1) Introduction
In this study and development "Heat Exchanger" has been focused, which is considered to have large effects on power generation efficiency, economy and longtime reliability under corrosive circumstances from seawater on OTEC. KOBE STEEL., LTD has focused on establishing the processing technology to produce high heat transfer sheet with uneven surface via rolling process for C.P. Titanium with 50% higher yield strength than the softest grade CP titanium "JIS class 1". Saga University has conducted experiments and evaluations on thermal cycle efficiency and power generation performance of the OTEC plant using heat exchangers with the above heat transfer enhanced plates.
2) Outcome of the study and development in FY2012
(1) The manufacturing conditions concerning mill diameter, reduction rate, mill load and unit tension, for mass production sheet with an uneven surface for CP titanium with 50% higher yield strength than the softest CP titanium, were clarified, using test rolling mill examination and theoretical calculation. Manufacturing trial using our steel production line was successful to obtain thin gauge (0.6mm) sheet coil with an uneven surface. The mean height of protrusions was around 25μm, which is higher than 17μm for the conventional softest CP titanium JIS Class1 once manufactured. The PHE which were installed the heat transfer enhancement plate press-formed from the trial sheet, showed evaporation heat transfer improved 10% or more compared with that of the conventional smooth plate successfully, on the other hand, the condensation heat transfer did improve not much more than that of the conventional smooth plate.
In order to obtain the more superior performance of OTEC, condensation heat transfer should be improved. Next 2 years, we would focus on developing high condensation heat transfer plate.
(2) The developing prediction method for press formability of CP titanium sheet showed the potentials for useful tool for designing PHE plate shape, by proving the predicted forming height of CP titanium, had good agreement with the experiments.
(3) And also, concerning development of higher strength alloy with good press formability, compared to JIS CP titanium, it is found that adding the small amount of iron (Fe) or Carbon (C) is effective method for improving the balance between strength and press formability.
(4) Performance tests were conducted on developed heat exchanger, which found out that Evaporator's overall heat transfer coefficient and pinch temperature can be improved. These effects are also verified on 30kW experimental facility in IOES. This type of heat exchanger will give the lowest power generation cost when used in double-Rankine cycle.
(5) Result of experiments and evaluations show that, in most cases, ammonia is selected as an optimum working fluid except for small on-land type plant case which considers easy handling more important than other cases.
(6) Based on the above results, conceptual and basic design, as well as power generation cost estimation, were conducted on 1MW onshore type power plant and 10MW offshore type power plant.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る