The trend in marine market is focusing towards lower ship speeds in order to achieve lowest possible fuel oil and overall operating costs. To cope with this trend, engines are selected at rather low rating points and low shaft speeds to obtain the lowest possible specific fuel oil consumptions and to achieve low EEDI (Energy Efficiency Design Index) number. The existing portfolio engines have continuously been upgraded to fulfil the requirements of the marine market. A higher maximum engine power offers more potential for engine de-rating possibilities and subsequent benefits in lower specific fuel oil consumptions. The engine power of the W-X82 has been increased from 4520 kW to 4750 kW per cylinder (+5%) and hence the rating field was widely enlarged. The power of the RT-flex58T-E engine was increased by 4% to fulfil the specific market requirements this engine is used in. Additionally a "RT-flex-version" of the RTA48T-D has been designed and released to meet the requests mainly of the Chinese market. All engines are fully compliant with the current NOX emission regulation of Annex VI of the MARPOL 1973/78 convention. Solutions are under development to cope with the revised MARPOL Annex Vl for Tier lll regulations. Wärtsilä is focusing on external and built-in SCR technology. Additionally, EGR solutions are being tested and strong focus is given to 2-stroke low pressure gas engines. However these solutions are described in separate papers. Special attention is also given to improve the Pulse Lubricating System in order to further reduce the cylinder oil feed rates. Additionally, the newly introduced FAST injection nozzle not only reduces the specific fuel oil consumption by more than 1 g/kWh but also HC and CO emissions. With 646 RT-flex engines in service by end of 2012 the general running behaviour can be stated as very satisfactory. Structural components and crank train bearings are without complaints. Piston running is good and shortcomings on flexcomponents are being resolved and solutions have been implemented.
Upgrade of Wartsilas Two-Stroke Engine Portfolio to fulfil the Changing Marine Market Requirement
2013
14 Seiten, 24 Bilder, 8 Quellen
Conference paper
English
Upgrade of Wartsilas two-stroke engine portfolio to fulfil the changing marine market requirement
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