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日本エネルギー学会誌 Vol. 87 (2008), No. 3

ISIJ International
belloff
オンライン版ISSN: 1882-6121
冊子版ISSN: 0916-8753
発行機関: The Japan Institute of Energy

Backnumber

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キーワードランキング

03 Dec. (Last 30 Days)

日本エネルギー学会誌 Vol. 87 (2008), No. 3

メタンハイドレート層における深部地球熱を用いた熱刺激法の評価

藤井 光, 和崎 祐介, 糸井 龍一

pp. 199-207

DOI:

10.3775/jie.87.199

抄録

Thermal stimulation method is one of the prospective methods for gas production from methane hydrate (MH) deposits. In the thermal stimulation method, MH is dissolved to methane gas and water either by injecting heated water into the MH deposits or by circulating heated water in production wells. In this paper, the feasibility of heated water injection using the ground heat in the deep formation was investigated with numerical simulations. A co-axial ground heat exchanger (GHE) is designed to be drilled below MH deposits to produce the heated water. Numerical simulations showed that a GHE of 2000m deep can extract a geothermal heat over 200kW. On the basis of the estimated heat supply, numerical reservoir simulations were carried out to optimize the strategy of water injection in terms of gas production rates. The simulations showed that water injection should be commenced after a gas production with depressurization for 3 years since the timing maximized the cumulative gas recovery; the optimum injection rate was estimated 250L/min. The use of seawater as water source was also examined to demonstrate that the inhibitor effect of seawater, which lowers the dissociation temperature of MH, can accelerate the dissolution of MH. Assuming a production life of 20 years, the cumulative gas production, when using a GHE of 2000m deep and seawater as water source, was estimated 48.9% larger than the cumulative gas production without heated water injection.

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メタンハイドレート層における深部地球熱を用いた熱刺激法の評価

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高度制御熱分解による廃ポリプロピレンのケミカルリサイクル

佐々木 大輔, 鈴木 義弘, 萩原 俊紀, 矢野 彰一郎, 澤口 孝志

pp. 208-214

DOI:

10.3775/jie.87.208

抄録

For recycling waste plastics, development of new chemical recycling technologies is expected in order to meet the goals of a society that is based on resource recycling. In order to add value to waste polypropylenes, we tried to synthesis end-reactive oligomers by controlled thermal degradation of waste food trays, battery cases, washer tanks, and plastic bottle caps. Thermal degradation was performed at 370 and 390 °C for 1 to 3 h under reduced pressure. The average number of double bonds per molecule of obtained oligomer ranged from 1.66 to 1.2. This shows that 69 to 36 mol% of oligomer contained telechelics having double bonds at either end. The number average molecular weight and molecular distribution decreased remarkably from the raw materials and ranged from 21700 to 1400 and from 3.3 to 1.4, respectively. The melting temperature of the crystals decreased from 160 to 130 °C, depending on molecular weight. The obtained oligomer was useful as an end-reactive oligomer. Thus, controlled thermal degradation is potentially useful as a method for the chemical recycling of waste polypropylene products.

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高度制御熱分解による廃ポリプロピレンのケミカルリサイクル

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