Currently a renaissance of dual-fuel engines can be experienced in the large-bore engine markets. For a very long time this technology was in use only in stationary power generation application, where the market shares decreased clearly during the last decade due to the strong improvements on pure gas engine performance values and the extension of the pure gas engines to higher output ranges with large medium-speed engines. In addition to the previous sole land-based usage several mobile applications are now opening furthers markets for large-bore dual-fuel engines. These applications are marine main propulsion (e. g. LNG carries, cruise liners) and auxiliary usage (e. g. container vessels) as well as rail traction purposes (e. g. long-haul locomotives). The main drivers for the increased interest in DF engines are lower fuel costs in comparison to the expensive HFO or Diesel fuel and the opportunity to reduce especially the NO(x) emissions enabling a fulfilment of upcoming emission legislations. Further on natural gas could be a high-potential low-sulphur fuel as requested for a lot of mobile engine applications very soon. The typical secondary liquid fuel beside gas - which has been disadvantageous in stationary DF applications very often - enables as back-up fuel a very reliable mobile operation. In marine usage a DF engine facilitates a fulfilment of the IMO emission regulations inside and outside an ECA just by switching the mode between gas and Diesel operation. The challenges of the mobile applications are often variable speed operation, fast load response requirements, changing gas qualities and reliable engine operation even under difficult operating conditions. Due to the typical two operational modes (gas operation and Diesel operation) of DF engines several compromises must be made in engine design (e. g. compression ratio, piston bowl shape, valve timing, ...) as well. This leads currently to disadvantages with respect to efficiency and power density. With regard to the before mentioned topics AVL investigated the dual-fuel engine technology by systematic medium-speed single cylinder engine testing. A wide variety of parameters were evaluated and the operational borderlines were explored. Based on the gained results an short-term outlook with todays DF engine technology will be defined. AVLs future perspective of DF engine technology will be created as well enabling the definition of required midterm developments.
Improvement of Dual-Fuel-Engine Technology for Current and Future Applications
2013
10 Seiten, 14 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
Improvement of dual-fuel-engine technology for current and future applications
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