MAN L35/44DF Dual Fuel Engine

With the 35/44DF Dual Fuel engine, MAN Diesel & Turbo has developed an engine that unites the best of two worlds. It can operate on any available gaseous and liquid fuel or a combination of both without any difference in performance. This way, the 35/44DF offers all the benefits of gas operation like low emission levels and low operating costs as well as the capability to switch over to diesel operation at any time if needed. The MAN 35/44DF combines outstanding economic and ecological advantages with maximum flexibility, availability and performance, all in a uniquely robust and well-proven engine package.

German:
Mit dem 35/44DF Dual-Fuel-Motor hat MAN Diesel & Turbo einen Motor entwickelt, der das Beste aus zwei Welten in sich vereint. Er kann ohne Leistungsunterschied mit jedem verfügbaren gasförmigen und flüssigen Treibstoff oder einer Kombination aus beidem betrieben werden. Damit bietet der 35/44DF alle Vorzüge des Gasbetriebs wie geringe Emissionswerte und niedrige Betriebskosten sowie die Fähigkeit, bei Bedarf jederzeit auf Dieselbetrieb umzuschalten. Der MAN 35/44DF kombiniert herausragende ökonomische und ökologische Vorteile mit maximaler Flexibilität, Verfügbarkeit und Leistung, und das alles in einem einmalig robusten und bewährten Gesamtpaket.

AN Diesel & Turbo introduced the L35/44DF engine, the latest addition to its four-stroke portfolio. The new marine engine offers dual diesel fuel-gas operation and can also be introduced as a retrofit to engines already in service. The first prototype entered its test phase at the beginning of the second quarter 2012 at MAN Diesel & Turbo’s Augsburg facility.

The L35/44DF engine exhibited at SMM (Shipbuilding, Machinery & Marine Technology) trade fair in Hamburg in September. Click to enlarge.

A V-type engine version is being developed simultaneously that will enlarge the power-output range of the company’s dual-fuel engine portfolio as part of MAN Diesel & Turbo’s market strategy.

The company is introducing the L35/44DF engine at a time where separate emissions legislation for harbors is set to come into play, in addition to the upcoming IMO Tier III emission regulations for marine applications. Accordingly, MAN Diesel & Turbo views the introduction of another engine that offers the option of operation on gaseous fuels as timely.

With the L35/44DF engine, MAN Diesel & Turbo is continuing the expansion of its product program with a dual-fuel engine based on common rail technology. MAN Diesel & Turbo’s development objective with the new engine was to produce a high efficiency/ high specific power output unit that complied with IMO Tier II emission limits in diesel mode and IMO Tier III limits in gas operation.

A high degree of fuel flexibility (HFO, MDO, MGO and natural gas) was another primary objective. With an output of 530 kW/cylinder (711 hp) , the inline 35/44DF is available in 6 – 10 cylinder configurations, equivalent to total power outputs from 3.2 MW to 5.3 MW. This represents the highest power output available in the segment and complements that offered by the larger L51/60DF type.

The L35/44 engine has also been specifically developed for the retrofit of 32/44CR-T2 engines where it can take advantage of a high level of component synergies and the same crankcase, which can be re-machined on board. Subsequent engine operation is mainly intended for gas mode with a separate pilot ignition system—based on proven technology widely employed by the truck industry—that is independent of the primary, common rail injection system. However, the common rail system is retained and fully functional as a back-up system in the event of any problem while operating in gas mode.

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