【作者】

Philipp Schuermann,Melanie Hubacher

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 The trend towards higher fuel prices is expected to continue. In addition, the upcoming EEDI scheme requires a reduction in CO2 emissions. Both are boundary conditions calling for more fuel efficient propulsion solutions for large merchant vessels. In this respect ABB has investigated the potential of two-stage turbocharging on two-stroke low speed engines. Based on experience from preceding tests and extensive simulation exercises, ABB Turbocharging presents two different application cases for two-stage turbocharging of 2-stroke engines for marine propulsion. The first system building up on turbo compound by means of a power turbine and moderate increase of power density heads for maximum system efficiency. This system allows for the highest reduction in fuel consumption of all compared cases, however closely followed by a concept without power turbine based on part-load optimized 1-stage turbocharging and derating. However, according rough indications from commercial projects realized in the past the first costs of the former concept are expected to be high, which relativize the benefits in basic of the 2-stage turbocharging with a power turbine. The second system focuses on downsizing the engine to extreme power density levels. Extreme downsizing can theoretically be conducted up to a bmep of 30 bar by scaling engine tuning parameters of today's typical engines. While offering downsizing potential, it should be considered that with increasing boost, exhaust gas temperature after turbine is reduced and with it the extractable enthalpy for steam production. For both systems avail-able IMO Tier lll emission reduction methods can be used.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

3

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