【作者】

Claudio Christen,Daniel Brand

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 Abstract: Gas and dual fuel engines applying the Otto cycle are commercially available solutions undercutting the NOx limits set out by the IMO Tier 3 regulation. Furthermore, it has been demonstrated that the concept of the strong Miller process enabled by two stage turbocharging and variable valve timing is an attractive solution to considerably improve the tradeoff between fuel consumption and NOx emissions for diesel engines. For gas engines, the concept can be utilised to bring the trade-off between fuel consumption and power density to a new level. The potential has been confirmed on real gas and diesel engines with excellent results. A comprehensive simulation study has been carried out in order to transfer the concept of strong Miller cycle, two-stage turbocharging and variable valve timing to dual fuel engines. The study identified great potential for improving fuel consumption in both diesel and gas mode when integrating ABB's two-stage turbocharging Power2 and variable valve train VCM ®into a seamless concept. Furthermore, the flexibility of VCM resolves some of the compromises needed when designing an engine capable of running according to the Diesel and the Otto cycle. In addition, FPP operation as well as improved manoeuvrability and load pickup for gas and dual fuel engines may be realised, as the extensive thermodynamic simulation work indicates. The publication presents the assumptions and boundary conditions that were used, the underlying modelling approach and the potential found, while also discussing expected challenges.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

7

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