巻号一覧
38 巻 (2000)
- 6 号 p. 342-
- 5 号 p. 262-
- 4 号 p. 198-
- 3 号 p. 124-
- 2 号 p. 68-
- 1 号 p. 4-
前身誌
38 巻, 5 号
選択された号の論文の8件中1～8を表示しています
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寺本 徳郎, 西川 雄二2000 年 38 巻 5 号 p. 262-267
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーIn order to simulate fracture behavior of nuclear fusion first wall by electromagnetic force, 4-point-loading test was conducted and mode III fracture toughness of SM490 and its welded joint was evaluated. The mode III fracture toughness of fusion zone was lowest while the resistance against crack extension was relatively high for weldment and fusion zone. In these, the friction of crack faces by slight crack curving or rough fracture surface contributes to high resistance. In all specimen, the fracture surface was occupied by inclined-elongated-dimple though crack extension by shear force was eminent near specimen surface.抄録全体を表示PDF形式でダウンロード (4180K) -
長野 眞康, 宮澤 健博, 朝山 昇, 吉田 一弘2000 年 38 巻 5 号 p. 268-276
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーThis paper describes the results of experiments and temperature analyses regarding the incidents of liquid zinc induced cracking of high tensile strength steel (590MPa) tubes under hot-dip galvanizing. The cracks were observed at the toes of fillet welds between the tubes and the ring-plates which were different in thickness. It is well known that the cracking of steel tubes due to “Liquid Metal Embrittlement” can be induced under the following conditions, that is, high tensile stress exists at the toes of the welds, and the temperature of the tubes exceeds the melting point of zinc (420°C). Hot-dip galvanizing is composed of three processes, dipping into molten zinc, air-cooling, and water-cooling. To identify when the cracks had been induced, the experiments of hot-dip galvanizing were performed and cracks were reproduced from dipping into molten zinc through air-cooling. The results of temperature measurement in the experiments and analyses show that some thermal tensile stress can be generated by the difference of temperature between the tube and the plates due to the difference of their thickness at each process, while the temperature of the tube is kept above the melting point of zinc.抄録全体を表示PDF形式でダウンロード (5250K) -
WE-NETプロジェクト第I期研究開発成果と第II期研究開発計画福田 健三2000 年 38 巻 5 号 p. 279-289
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーThe Kyoto Protocol determined at COP3 in Dec 1997 is forcing Japan to reduce the emission of greenhouse gases by 6% in the year 2008-2012 compared to 1990 level. Concern with potential global climate change will become greater within the next decade, forcing society to move toward energies that will minimize the emission of greenhouse gases. Hydrogen energy is considered to present a potential effective option for achieving the greenhouse gas minimization. Japanese Govemment is promoting the WE-NET (World Energy Network) Project (Phase I: 1993-1998, Phase II: 1999-2003) which envisions (1) construction of a global energy network for effective supply, transportation, storage and utilization of renewable energy using hydrogen as an energy carrier as a long-term option of sustainable energy economy, and (2) promotion of market entry of hydrogen energy in near and/or mid future even before construction of a WE-NET system. In this paper, the results of the Phase I research and development will be summarized and the Phase II program will be described, where an emphasis is put on the research and development of small-scale and distributed hydrogen utilization technologies such as fuel cell vehicle related technologies.抄録全体を表示PDF形式でダウンロード (1272K) -
岡野 一清2000 年 38 巻 5 号 p. 290-297
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーUnder the WE-NET program, hydrogen utilization technology development plays the most significant role in the effective exploitation of hydrogen as a clean and highly efficient energy source.
Feasibility study of hydrogen/oxygen diesel engine co-generation systems, hydrogen-fueled vehicles, hydrogen-fueled PEM fuel cell power plants and hydrogen refueling stations were conducted in Phase I program. It was found that very high efficiency systems could be achieved by the use of hydrogen fuel for diesel engine cogeneration and fuel cell power generation. Research and development of those hydrogen utilization technologies have been started in the phase II program in FY1999. A 100kW hydrogen and oxygen fueled single cylinder diesel engine, on-board metal hydrides fuel storage system for hydrogen vehicles, a 30kW hydrogen fuel cell power plant and hydrogen refueling stations have being developed, and demonstration of these hydrogen utilization systems will be carried out in FY2003.抄録全体を表示PDF形式でダウンロード (4440K) -
深野 隆, 山下 直彦, 大平 勝秀2000 年 38 巻 5 号 p. 298-305
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーHydrogen is expected to be a clean energy source. However, if it has to be utilized as the energy source, huge amount of hydrogen has to be transported and/or stored, which suggests to treat hydrogen in liquid state. For this realization of the liquid hydrogen energy, a study of large hydrogen liquefaction process has to be conducted.
Based on the construction history of large hydrogen liquefaction plants and the process efficiency of various cryogenic plants studied by R. Strobridge, we set hydrogen liquefaction of 300t/day as the maximum capacity and as the target process efficiency, we set more than 40%.
Because there have been few studies about such a large hydrogen liquefaction process, the concrete process calculation was conducted. The processes studied were a hydrogen Claude cycle and a helium Brayton cycle, and in addition to these, a mix refrigerant cycle, neon cycle with a cryogenic compressor, and nelium (mixture of neon and helium) cycle were studied. As a result, though it was estimated that each cycle would achieve the process efficiency of more than 40%, a hydrogen Claude cycle was selected to be the most suitable process by the cost comparison.
Rough study about compressors and expansion turbines required in the hydrogen Claude cycle has been conducted to understand the required size and the technological issues to be developed. Though a turbocompressor is considered the most suitable for this large process, due to the small molecular weight of hydrogen, the development of the large hydrogen compressor will be one of the key issues. One of the solution, a compressor with small backward angle impellers is proposed.
This study was conducted in WE-NET project.抄録全体を表示PDF形式でダウンロード (823K) -
神谷 祥二2000 年 38 巻 5 号 p. 306-313
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーThe Japan hydrogen project, WE-NET (World Energy Net Work) have showed that LH2 (Liquid hydrogen) with large density would be the most promising medium for transporting and storing large mass hydrogen efficiently and economically. In the near future, a large mass liquid hydrogen storage for a ground tank and a ocean tanker will be needed, of which the commercial scale may be the same as the existing LNG storage system with several hundreds thousand cubic meter capacity. The conceptual designs of 200, 000m3 LH2 tankers and 50, 000m3 ground tanks have been studied. This study has concluded that the optimized thermal insulation structure for a mass storage tank should be developed. In order to evaluate thermal conductance of various devised insulation structures, we have manufactured a large scale experimental apparatus. This paper describes the conceptual designs of LH2 tankers and ground tanks, and also the abstract of the developed apparatus.抄録全体を表示PDF形式でダウンロード (2385K) -
上松 一雄2000 年 38 巻 5 号 p. 314-318
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーThis paper shows the result for Research & Development of Hydrogen/Oxygen Combustion Turbine which was performed under WE-NET Project from 1993 to 1998 Japanese fiscal year. At first, high efficiency cycle was selected. 1700 degree C Combustion Chamber, 1st vane and 1st blade was designed. Then Combustion test and 1st vane & blade cascade test was performed successfully and got good wall temp. data which was under allowable temp. and other useful data. But this research was quitted because hydrogen supply method was not clear now and some users claimed it. Therefore instead of this research, new project which uses LNG as popular fuel and the same high efficiency cycle as WE-NET started. This new project can develop the same element as WE-NET and contribute to CO2 reduction.抄録全体を表示PDF形式でダウンロード (2187K) -
籔本 政男, 横川 清志, 緒形 俊夫, 中川 英樹, 江口 晴樹, 藤井 秀樹, 岡口 秀冶, 石尾 光太郎, 林 稔, 斎藤 正洋2000 年 38 巻 5 号 p. 319-327
発行日: 2000/09/25
公開日: 2010/08/05
ジャーナル フリーFor evaluation of low temperature embrittlement and hydrogen embrittlement of structural materials used for liquid hydrogen storage and transportation, three commercial materials, SUS304L, SUS316L (austenitic stainless steels) and A5083 (aluminum alloy) were selected. Tensile, fracture toughness and fatigue tests were conducted in liquid hydrogen (20K). Test results indicated that the weld metals were most susceptible to both low temperature and hydrogen embrittlement, irrespective of the materials.抄録全体を表示PDF形式でダウンロード (2338K)
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