IMO Tier 3:Gas and Dual Fuel Engines as a Clean and Efficient Solution
(0) 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 twostage 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.
Claudio Christen Daniel Brand
ABB Turbo Systems Ltd,Switzerland
国际会议
上海
英文
1-16
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）