著者
Qiusheng LIU Katsuya FUKUDA Takuma MATSUDA
出版者
The Japan Institute of Marine Engineering
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.41, no.SI, pp.144-149, 2006-09-01 (Released:2010-05-31)
参考文献数
12
被引用文献数
5 4

Carbon dioxide (CO2) ocean sequestration technologies, such as dissolution into seawater, are important to mitigate global warming. In this study, solution processes of CO2 gas in seawater and pure water were experimentally studied under various pressures and temperatures to evaluate the solubilities of CO2 in seawater. The solubilities of CO2 in seawater and pure water were measured by a change in pressure due to absorption at pressures up to 30 MPa and the temperatures ranged from 4°C to 60°C. It was obtained that the solubilities of CO2 were between 0.27 × 10-3 and 1.26 × 10-3 in seawater, and between 0.26 × 10-3 and 0.6 × 10-3 in pure water near atmospheric pressure. The values increase with an increase in pressure, but decrease with an increase in temperature. The Henry's law constant of CO2 was about 105 MPa at a temperature of 4°C in seawater under atmospheric pressure, and increased with an increase in temperature. The solubility of CO2 in seawater was lower than that in pure water. Empirical correlations for solubilities of C02 in seawater and pure water at various temperatures under atmospheric pressure were obtained based on the experimental data.
著者
羽根田 誠 永井 義和 菅原 広 矢田部 孝 上井 博明
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.44, no.4, pp.627-630, 2009 (Released:2012-07-25)
参考文献数
4
被引用文献数
1

Although containerization of marine transportation has been bringing globalization to our daily life, it also triggered a dazzling development of technology on marine transportation side as well. Our daily life has become healthy via the development of transportation technology for such as fresh foods, and by use of the marine reefer container. Marine transportation technologies for fresh foods have been tackled with various techniques. We hereinafter introduce the transition technology for transportation by marine reefer container from the beginning of the container age until the present.
著者
段 智久 橋本 正孝 浅野 一郎 奥村 哲平 鈴木 直樹
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.44, no.2, pp.322-327, 2009 (Released:2012-04-20)
参考文献数
9
被引用文献数
3 3

DME is the simplest ether and consists of oxygen and methyl. Because of its chemical and physical properties it is thought that DME could be one of the candidates as an alternative fuel in the internal combustion engine. The authors have been investigating the combustion characteristics of the mixed fuel comprising of Dimethyl ether and Marine Diesel Oil (JIS A-heavy oil). In the experiments, DME is mixed at the liquefied state with MDO inside a high pressure fuel tank pressured with nitrogen gas. Fuel supply lines are replaced with pressure resistant tubes, and the mixed fuel is supplied to the small direct injection diesel engine. We obtained the effect on the fuel injection characteristics to the mixed fuel combustion, in the diesel engine. The two different fuel injection rates are obtained by changing the injection nozzle opening pressure, that for the relatively lower case (9.0MPa) and higher (24.0MPa). The fuel injection pressure histories and the combustion characteristics, such as the combustion pressure and the exhaust emission, are examined for both the injection conditions. The average injection pressure increased with increased engine load in the lower nozzle opening pressure case. Whilst it is almost constant with the higher nozzle opening pressure case. It was concluded that ignition delay could be shortened by DME mixing. And NOx emissions were reduced in the higher engine load case, and with mixing DME for both nozzle opening pressure cases.
著者
橋本 正孝 段 智久 浅野 一朗 大谷 友人
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.44, no.3, pp.456-462, 2009 (Released:2012-06-02)
参考文献数
3
被引用文献数
2 2

Palm oil is being seriously looked at as one of the alternative fuels to fossil fuels, this being due to the aspect of vegetable oils and the so called carbon neutral state. However, at room temperature, the viscosity of palm oil is too high to apply as a fuel for the internal combustion engine. In this study, pure palm oil is mixed with fossil fuels, this in order to reduce the viscosity. In the experiment palm oil was blended with gas oil and then marine diesel oil, by weight ratio, and the kinematic viscosity of the mixed fuels were measured. In the cases of 20% palm oil used, and 50%, was found to be useable without any heating of the fuels. Engine performances, such as cylinder pressure histories and exhaust emissions, were examined with a pre-combustion chamber type diesel engine. We discovered that a palm oil blended fuel shows earlier ignition and shorter combustion period than gas oil or marine diesel oil. NOx emissions show a lower concentration for all palm blended cases, and the reduction ratio is proportional to the palm mixing amount. From these results, we can suggest that palm oil could be used for the diesel engine by mixing with the fossil fuels without heating the fuels.