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MITSUI runs adapte ME-GI gas engine on hydrogen up to 100% load

MAN Energy Solutions’ licensee, MITSUI E&S Co. Ltd., successfully tested a 50-bore (50 cm) MAN B&W two-stroke engine up to 100% load at its Tamano facility while running on hydrogen, a first for the maritime industry.

In collaboration with MAN Energy Solutions, MITSUI converted one of the four cylinders of the test engine 4S50ME-T (output 7 MW, rated speed 117 rpm, MEP = 2.10 MPa) to hydrogen operation, based on the LNG-fired ME-GI engine design. The hydrogen was supplied from a hydrogen gas-supply system that MITSUI developed in 2023.


Hydrogen combustion test on MAN B&W 4S50ME-T

Stable operation was achieved at various loads and operating conditions, including successful hydrogen combustion up to 100% load. In 100% load operation using hydrogen fuel, MITSUI succeeded in covering the equivalent of 95% of the heat value with hydrogen fuel, and the cylinder pressure curve was equivalent to that of the other three cylinders operated with conventional fuel.


MITSUI also confirmed greenhouse-gas emission reductions of up to 95%, with the remaining fraction originating from the pilot-fuel employed during testing.

We have worked closely with MITSUI on this research project and are very happy with the results achieved. This proves the advantages and the flexibility of two-stroke engine technology, and means that we are now also prepared for the future, not only for hydrogen derivatives but also for hydrogen as a fuel. MAN Energy Solutions closely follows the market to keep track of any significant developments and this test is a noteworthy progression.

—Bjarne Foldager – Country Manager, Denmark – MAN Energy Solutions



How do they lubricate the 2 cycle cylinder?


Marine Two Stroke engines have lubrication similar to Valve in head engines, i.e. from the main engine oil sump.

This reference depicts the oil system:

Roger Pham

Quoted from the reference provided by Gryf:
"The lube oil is pumped up from the main engine sump using the lube oil pump and is passed through the lube oil filter where any sort of impurities present in the lube oil is removed. It is then passed onto the lube oil cooler to extract heat from the oil which has accumulated over previous cycles.

The oil then reaches the distribution manifold through which it goes to different parts of the engine which need lubrication. After the lube oil has lubricated the working parts it falls back down into the main engine sump so that the cycle can continue.

But this oil from the main engine sump is not used for lubricating the area between the piston and cylinder liner as discussed above, so a different lube oil with higher TBN is taken from the cylinder oil tank to lubricate this area and this oil is not used again like the oil in the main engine sump."

The last paragraph stated that the piston and cylinder is lubricated by a different kind of oil, and this oil is used only once, and not recycled.

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