日本エネルギー学会誌
Online ISSN : 1882-6121
Print ISSN : 0916-8753
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93 巻 , 6 号
選択された号の論文の4件中1~4を表示しています
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論文
  • 江森 剛, 阿部 泰英, 石澤 雄馬, 飯島 晃良, 吉田 幸司, 庄司 秀夫
    93 巻 (2014) 6 号 p. 536-541
    公開日: 2014/06/30
    ジャーナル フリー
    本研究では,HCCI機関の急峻な燃焼を過給により緩和化させ,さらに失火に至るまで運転を行い,筒内分光測定及び排ガス分析によってその燃焼特性を調査した。またこれら燃焼反応を素反応レベルで解明するため,素反応数値計算を行った。その結果、過給によるリーン化により,燃焼が緩和化していく様子を捉えられた。冷炎でHCHOが生成され,主燃焼においてHCHOが消費されCOが生成し,その後,COがCO2に酸化される。また失火に至るとHCHOは増大する。以上のように,HCCI燃焼における低温酸化反応から主燃焼に至るまでのプロセスを実験的に解析することができた。
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  • Atsushi YOSHINO, Hidenari HORI, Kazuyoshi SATO, Takayuki TAKARADA
    93 巻 (2014) 6 号 p. 542-547
    公開日: 2014/06/30
    ジャーナル フリー
    The etching process by copper chloride is widely used in printed wiring board manufacturing. Unfortunately, almost copper waste solution is treated by neutralization method and the precipitated sludge is dumped on the ground without copper recovery. Brown coal has ion exchange ability because it has carboxy groups and hydroxyl groups in it. Using that ability of brown coal, copper recovery from the waste etching solution by low energy consumption method is studied. Copper ion in the waste solution can be loaded on Loy Yang brown coal around 8.5 wt% by adding ammonium hydroxide, adjusting pH in 9-11.5 and stirring at room temperature. When pH range is in 9-11.5, it is considered that copper and ammonium complex ions such as tetraamminecopper(II) ion [Cu(NH3)4]2+ are produced and exchanged with proton of carboxy groups in brown coal. Cu-loaded brown coal can be burnt at extremely low temperature; 160-180 °C, and 0.5-1.0 μm copper oxide particles are formed as the residue. From XRD analysis at the middle of burning, it is considered that Cu2O plays a role of catalyst of gasification and/or oxidation. It was shown that low energy consuming copper recovery method is feasible by using capability of ion exchange of brown coal and catalysis of Cu-loaded brown coal.
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  • Hisakazu SHIRAI, Hirokazu ARIGA, Eika Weihua QIAN
    93 巻 (2014) 6 号 p. 548-554
    公開日: 2014/06/30
    ジャーナル フリー
    The liquefactions of cellulose, rice straw, and red pine were conducted in a batch reaction system in the presence of solid catalysts and several protonic solvents, such as methanol and ethylene glycol. In the solvolysis of cellulose in methanol, methyl-glucopyranosides were the main products formed via the addition of H+ and OCH3 in the presence of a solid catalyst. The decomposition rates of cellulose in various solvents decreased in the order of water › methanol › ethylene glycol › 1-butanol. This may suggest that the solvents with large self-dissociation constant (KSH) enhance the solvolysis of cellulose. In addition, the pore structure and acidity of a solid acid catalyst and type of lignocellulosic biomass also affected the solvolysis. The maximum liquefaction rates of rice straw and red pine in ethylene glycol using a sulfated zirconia catalyst at 453 K for 6 h were ca. 78.7% and 97.5%, respectively.
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技術論文
  • Shigeru KATO, Daiki KATAYAMA, Hiroyuki TSUNODA, Pandian LAKSHMIPATHIRA ...
    93 巻 (2014) 6 号 p. 555-560
    公開日: 2014/06/30
    ジャーナル フリー
    The life cycle assessment of lithium-ion (Li-ion) rechargeable battery was evaluated by charge and discharge processing. The influence of the temperature was studied during several hundred cycles of charge/discharge process of Li-ion battery. The charging capacity was observed to be decreased with increased number of cycle, especially at higher temperature of the environment of 60 °C. The cathode of Li-ion battery was found to be affected by heat stress and charge/discharge cycles by XRD analysis. The GC-FID and GC-MS studies revealed that the diethylfluorophosphate (DEFP) is a degraded product of electrolyte. Though the decomposition of ethylene carbonate (EC), a major component of the electrolyte in the Li-ion battery was not clearly found, the relative area of DEFP to that of EC was found to be increased with increased charge /discharge cycle number at 60 °C.
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