【作者】

Masanori Higashida

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。IMO NOx emission regulation Tier 3 has come into force since January 2016 and requires the marine low speed twostroke diesel engines to reduce their emission below a cycle value of 3.4 g/kWh in Emission Control Area (ECA). To meet the requirement with the minimum penalty in fuel oil consumption in any sea areas, K-ECOS (Kawasaki Ecology & Economy System) has been newly developed as an add-on system to the current two–stroke diesel engines for the field test. K-ECOS consists of four systems, such as Exhaust Gas Re-circulation system (EGR), Water Treatment System for EGR (WTS), Water Emulsified Fuel system (WEF) and Turbocharger cut-out system (T/C cut), and an integrated control system (K-ECOS-CS). K-ECOS prepares several running modes for operators. By just pushing a mode button on K-ECOS-CS suitable for the sea area, each mode selects and controls the systems among four to optimize fuel oil consumption and characteristics of emission automatically. Switching one mode to the other or transition one system to another in the mode does not require complicate handlings and delicate tunings between systems from the operators. In ECA, for instance, “Tier 3” running mode is selected on K-ECOS-CS, which controls EGR, WEF & T/C cut in parallel to comply with Tier 3 regulation without any penalty in fuel oil consumption. Out of ECA, a combination of WEF & T/C cut is normally used to achieve both lowest fuel oil consumption and emission level clearing Tier 2 regulation. High pressure EGR system with built-in gas cooler and wet scrubber is applied for the compactness of the system and for a less risk of corrosion on T/C blower. The scrubber is of chemical desulfurization type and of gas-liquid collision type, which enables to remove SOx and PM efficiently. The major components of EGR are so designed to be equipped on the engine to facilitate the installation in the ship. Water treatment system for EGR has been also originally developed to remove PM out of the washing water from the scrubber. A special compact settling tank with unique ditches as a component has been developed based on the sewerage treatment technologies and secures the efficient removal of PM. Turbocharger cut-out system has an original sequential control mechanism for two different size turbochargers in order to cut-out or operate the smaller sub turbocharger automatically depending on engine load, without engine stop for switching on/off. It always contributes to the lowest fuel oil consumption in/outside ECA. Water emulsified fuel technique is preceding EGR and has already completed long term operation test more than 4 years on other ship in order to accumulate experiences in service field. This paper describes 1) the features of K-ECOS installed on the main engine Kawasaki-MAN B&W 7S60ME-C8.2 for a pure car carrier, and reports 2) the engine performance and emission characteristics at shop trial including the result of combined EGR & WEF system in comparison with EGR alone, and then, 3) those at sea trial

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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