著者

三原 悠 浅野 一朗 段 智久 岡村 秀雄 松村 千里 羽賀 雄紀 中坪 良平

出版者

公益社団法人 日本マリンエンジニアリング学会

雑誌

マリンエンジニアリング (ISSN:13461427)

巻号頁・発行日

vol.56, no.3, pp.473-483, 2021-05-01 (Released:2021-06-02)

参考文献数

29

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As a way to improve the combustion characteristics of wood tar which is highly viscous and flame retardant, the authors blended it with liquefied dimethyl ether (DME), which can improve fuel fluidity, ignitability and spray atomization. Moreover, heavy fuel oil (bunker-c oil) was added to increase the heating value of this fuel sample. The sample, which has the blending ratio of 35 % wood tar, 30% DME and 35% bunker-c by weight, was used in a combustion test with a three-cylinder in-direct injection diesel engine. Additionally, the authors also investigated particulate matter (PM) produced after burning four samples that mixed liquefied DME with flame retardant fuels in the same engine to analyze its environmental and biological impacts. The four samples prepared for the experiment were (1) 70% distillate oil (bunker-a) and 30% DME; (2) 85% bunker-c and 15% DME; (3) 70% bunker-c and 30% DME; (4) 35 % bunker-c, 30% DME and 35% wood tar.  The results of the engine test suggested the possibility that wood tar could become more combustible by optimizing the flow rate of fuel and the blend ratio of liquefied DME and bunker-c. In the (4) case, PM showed no high mutagenic potentials and there were lower concentrations of such inorganic substances as vanadium and nickel. Polycyclic aromatic hydrocarbons (PAHs) concentrations in PM decreased by blending liquefied DME with bunker-c, whereas did not decrease for the wood tar.

著者

三原 悠 浅野 一朗 段 智久 岡村 秀雄 松村 千里 羽賀 雄紀 中坪 良平

出版者

公益社団法人 日本マリンエンジニアリング学会

雑誌

マリンエンジニアリング (ISSN:13461427)

巻号頁・発行日

vol.56, no.3, pp.473-483, 2021

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<p>  As a way to improve the combustion characteristics of wood tar which is highly viscous and flame retardant, the authors blended it with liquefied dimethyl ether (DME), which can improve fuel fluidity, ignitability and spray atomization. Moreover, heavy fuel oil (bunker-c oil) was added to increase the heating value of this fuel sample. The sample, which has the blending ratio of 35 % wood tar, 30% DME and 35% bunker-c by weight, was used in a combustion test with a three-cylinder in-direct injection diesel engine. Additionally, the authors also investigated particulate matter (PM) produced after burning four samples that mixed liquefied DME with flame retardant fuels in the same engine to analyze its environmental and biological impacts. The four samples prepared for the experiment were (1) 70% distillate oil (bunker-a) and 30% DME; (2) 85% bunker-c and 15% DME; (3) 70% bunker-c and 30% DME; (4) 35 % bunker-c, 30% DME and 35% wood tar.</p><p>  The results of the engine test suggested the possibility that wood tar could become more combustible by optimizing the flow rate of fuel and the blend ratio of liquefied DME and bunker-c. In the (4) case, PM showed no high mutagenic potentials and there were lower concentrations of such inorganic substances as vanadium and nickel. Polycyclic aromatic hydrocarbons (PAHs) concentrations in PM decreased by blending liquefied DME with bunker-c, whereas did not decrease for the wood tar.</p>

著者

川本 雄大 田内 萌絵 山地 一代 中坪 良平 板野 泰之 山本 勝彦 和田 匡司 林 美鶴

出版者

公益社団法人 大気環境学会

雑誌

大気環境学会誌 (ISSN:13414178)

巻号頁・発行日

vol.56, no.2, pp.35-42, 2021-02-07 (Released:2021-02-05)

参考文献数

13

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瀬戸内海周辺地域は全国的に見て相対的に大気汚染物質濃度が高い状態にあり、この原因の一つが、船舶由来の排気ガスとの指摘がある。本研究では、瀬戸内海海上と周辺陸上局にてそれぞれ測定された大気中のSO2、NOx、PM2.5の時空間変動の特徴とその要因を考察した。垂水局と兵庫南部局にてConditional Bivariate Probability Function解析等を行った結果、SO2濃度は海風の進入とともに上昇し、高濃度時には船舶の往来が集中する明石海峡方向からの大気の流入が確認できた。これは、二山型の日内変動を示すNOxとは異なる傾向となった。PM2.5は、春から秋にかけて日中の濃度上昇が確認できたが、SO2やNOxと比較して日内変動幅は小さく、広域的な汚染であることが示唆された。海上のSO2濃度は、最大で陸上局濃度の約5倍となり、他方、NOxは陸上局と同程度あるいは低濃度、PM2.5は陸上局とほぼ同程度であった。大阪湾・播磨灘および周辺沿岸地域において、SO2とNOxの主要な発生源は、それぞれ海上と陸上に存在する可能性が示された。