MAN presents a “dual” engine that runs on diesel and hydrogen and emits 50% less CO2

MAN Engines, MAN’s engine division, has put its first two “dual” engines into operation on two workboats, engines capable of running on both diesel and hydrogen.

It is an adaptation of two MAN D2862 LE448 twelve-cylinder diesel marine engines in vee They are conventional diesel engines, with just a few modifications, that do not need substantial changes to run on hydrogen according to Werner Kübler, MAN Engine Development Director. At the hardware level, only the hydrogen injection system had to be adapted (shown in blue in the image below).

Hydrogen is introduced into the intake through an adapter and is subsequently added to the combustion cycle. The combustion process starts in a similar way to diesel and requires the injection of approximately 5% diesel. MAN has optimized the injection map common rail so that the engine can work with two fuels indistinctly. If the hydrogen tank is depleted, the engine can continue to run on diesel without any interruption.

At the hardware level, only the hydrogen injection system (shown in blue) had to be adapted.

According to MAN, operation with hydrogen does not alter the behavior of the engine compared to operation with diesel, even at full load. Maximum power remains the same (1,019 hp at 2,100 rpm), although CO2 emissions are reduced by an average of 50% when the engine runs on hydrogen and up to 80% maximum, depending on operating circumstances.

Like any diesel engine with these characteristics, the engines are IMO Tier III certified and are equipped with an exhaust gas after-treatment system and selective catalytic reduction (SCR) to eliminate or reduce nitrogen oxides. The hydrogen injection system has been developed by CMB.TECH, MAN’s strategic partner in hydrogen technology.

The first MAN dual engines have been mounted on the Hydrocat boat

The two MAN D2862 LE448 engines are already being used on the Hydrocat 48 boat from Windcat Workboats, the first hydrogen-powered boat of its kind. The boat in question works in the transportation of people on the high seasmainly in the offshore wind sector (driving personnel from a larger vessel to the platform or to a wind generator).

Another advantage of this propellant is that, as it is based on a conventional diesel engine, maintenance and revisions are practically the same as an exclusively diesel engine. An important issue for customers interested in using these engines, which MAN already has ready for series production.

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