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Changes in fuel injection pressures and fuel spray quantity of marine diesel engines
Naohiro YAMATANI,Atsumu TEZAKI,Sotomi ISHIHARA,Toshihiko NAKATANI,Noriko NISHII,Hiroshi MIKAMI 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
When four-stroke diesel engines operate over long durations, it is well known that the fuel injection pressure decreases steadily, and then often followed by incomplete combustion in engine. Poor combustion in engine caused by the pressure drop is a big problem because it causes environmental pollution. However, changes in the exhaust temperature in four-stroke diesel engines occur more slowly than that in the fuel injection pressure. So, the effects of the fuel-injection-pressure drop on the exhaust gas temperature and maximum pressure do not appear in the operating data. It is difficult to grasp the combustion state from the operating data of an actual machine. This study aimed to observe and investigate carefully the phenomena that were accompanied with a drop in the fuel injection pressure.
Exhaust gas purification of ship in diesel oil combustion and future idea
Naohiro YAMATANI,Atsumu TEZAKI,Noriko NISHII,Toshihiko NAKATANI,Shigemi MATSUMURA 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
The IMO (International Maritime Organization) is an administrative organization related to ships. It is a specialized agency of the United Nations established in 1958 to promote intergovernmental cooperation on maritime issues. As of July 2015, 171 countries and 3 regions including Hong Kong are affiliated. In 2016, as a specific environmental measure for combustion products emitted from ships, it was required to equip mandatory installation of SCR (Selective Catalytic Reduction) From 2020, ships that do not have desulfurization equipment will be restricted from using substantially inferior crude oil (C heavy oil). Companies that operate ships are planning to switch to high quality fuel and get over it, but the cost of fuel will increase by more than 20%, so urgent measures are required. In this study, we propose environment al load reduction assuming diesel oil.