Reduce your carbon footprint with methanol GenSets: MAN L21/31DF-M and the new MAN L27/38DF-M
Methanol is a leading alternative fuel in the quest to decarbonize the maritime industry. Responding to growing demand, we present our perfectly harmonized methanol GenSets.
The MAN L21/31DF-M was the first small-bore dual-fuel methanol GenSet in our portfolio. And the new MAN L27/38DF-M is the next milestone and addition to our small-bore engine portfolio.
MAN Energy Solutions in Frederikshavn, Denmark is home of the MAN L21/31DF-M, our first small-bore GenSet fueled by methanol.
Proven design
The foundation of both engines are the trusted and proven L21/31 and L27/38 GenSets, which have jointly accumulated more than 290 million operating hours, with thousands of engines in service.
Key benefits
Perfect design features for efficient and reliable operation
These engines are based on the existing L21/31 and L27/38 GenSets and their well-established technology, with thousands of engines in service and more than 110 million operating hours so far.
The port fuel injection (PFI) concept of the MAN L21/31DF-M uses proven components, providing additional simplicity and an attractive capital outlay. The long time between overhauls (TBO) gives you flexibility for maintenance planning as well as saving time and costs.
The MAN L27/38DF-M is more powerful and can be used as a GenSet or for diesel-electric propulsion. The design supports an optimal methanol fuel share with only minimum amounts of fuel oil acting as pilot oil.
Technical specifications – MAN L21/31DF-M
| Description | Main data |
Bore | 210 mm |
| Stroke | 310 mm |
| Speed | 900 / 1,000 rpm (60 Hz / 50 Hz) |
| Output | 1,000 – 1,980 kW |
| Cylinder configurator | 5 – 6 – 7 – 8 – 9 |
| Available fuels | HFO, MDO, MGO, LSFO, ULSFO, Biofuels, MeOH |
| Emission limit | IMO Tier III with SCR after-treatment |
Optimized port fuel injection
The port fuel injection (PFI) system uses a methanol injection nozzle installed outside the combustion chamber. This simplified design removes the risk of blocked nozzles in diesel mode and reduces investment costs thanks to its easy installation and integration with standardized components.
MAN SaCoS control system and cybersecurity
The safety and control system MAN SaCoS supports a fast and reliable data-transfer between the engine and the power management system in the control room by easy cable connection.
The engine control system is attached to the engine and features an intuitive user interface and a colour display in different languages. The electric speed governor enables fast response.
Perfect match for MAN B&W ME-LGIM two-stroke methanol engine
The first MAN B&W ME-LGIM came into service in 2016. Since then, we have accumulated more than half a million running hours on methanol alone, which provides a solid base for new developments. The L21/31DF-M is a perfect match for this methanol-fueled propulsion engine.
Technical specifications – MAN L27/38DF-M
| Description | Main data |
Bore | 270 mm |
| Stroke | 380 mm |
| Speed | 720 / 750 / 900 rpm |
| Output | 1,980 - 3,690 kW |
| Cylinder configurator | 6 – 7 – 8 – 9 |
| Available fuels | HFO, MDO, MGO, LSFO, ULSFO, Biofuels, MeOH |
| Emission limit | IMO Tier II, IMO Tier III with SCR after-treatment |
Low-pressure fuel supply system
The methanol supply system for L27/38DF-M is a cost-optimised low-pressure system, effectively making it a profitable solution providing a lower capex.
Increased fuel flexibility
The possibility to operate engines on methanol as a drop-in fuel means that e-methanol and bio-methanol increase the fuel flexibility of the new engine and the potential of methanol as an option for GenSet applications on large merchant marine vessels as well as for propulsion solutions for smaller vessel types.
MAN SaCoS control system and cybersecurity
The safety and control system MAN SaCoS supports a fast and reliable data-transfer between the engine and the power management system in the control room by easy cable connection.
The engine control system is attached to the engine and features an intuitive user interface and a colour display in different languages. The electric speed governor enables fast response.
What makes the new methanol-fueled MAN L21/31DF-M GenSet special?
Watch our 3D engine animation to find out more about the working principles, and also the Port Fuel Injection system.
Service solutions for your equipment
MAN PrimeServ offers a range of modernization solutions for optimizing the reliability, availability, and economic efficiency. MAN’s upgrade and retrofit solutions are tailor-made to customers’ specific applications and equipment.
Are you ready for green methanol?
Newbuild or retrofit? What are the costs? What are the benefits? Take the lead in sustainable shipping by contacting us today!
Continue reading
Inside the making of a methanol GenSet
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Set course to net zero with methanol GenSets - MAN L21/31DF-M
Watch the recording of our MAN ExpertTalk, where we introduced our new engine type: the small-bore four-stroke MAN L21/31DF-M GenSet for methanol operation.
You can look forward to hearing
about this new GenSet type, the Port Fuel Injection (PFI) concept, the fuel gas supply system and the possibility to operate these GenSets on green methanol and biofuel oils.