Family 31
Wärtsilä 31 engine family
future-proof plant solutions with world-class efficiency

Wärtsilä 31 engine family for power plants

World-class efficiency
World-class efficiency
Efficiency is a key in modern power generation. The Wärtsilä 31 engine family was designed to improve the efficiency of your operations while also decreasing the total lifecycle cost of your plant.


Fuel flexibility
Operational flexibility
Our engines reach full output in 2 minutes from the start command, allowing for the flexibility needed to balance high levels of unpredictable renewables in the power system. When the sun stops shining, or the wind stops blowing the engines will be ready to supplement your generation needs or carry the baseload.


Operational flexibility
Fuel flexibility
The modular design of the Wärtsilä 31 engine family enables easy conversions between pure gas, multi-fuel and pure liquid fuel variants, and can also be adapted to run on renewable fuels. Improve your energy security and plant adaptability with our fuel-flexible engines.





The Wärtsilä all-in-one power plant for the energy system of the future

Output %An all-in-one power plant from Wärtsilä for the power system of the future


1 FAST START
GRID STABILITY

FEATURES
• Power to grid in 30s
• 2 min to full power
• Start up efficiency



2 BASELOAD
COMPETETIVE COST AT ANY OUTPUT

FEATURES
• Highest simple cycle efficiency
• Multi unit → high firm capacity
• Flexicycle ™



3 LOAD FOLLOWING
BALANCE RENEWABLES

FEATURES
• Part load efficiency unaffected
• No EOH cost for cycling



4 LOW-LOAD OPERATION
RUN ONLY WHEN PROFITABLE

FEATURES
• 1 min shutdown 
• No minimum down time
• Zero fuel cost
• Zero emissions



5 FAST STOP
OPTIMAL EFFICIENCY

FEATURES
• 1 min shutdown
• No minimum up time
• No EOH calculation









Wärtsilä 31DF

– multi-fuel engine power plant solution.
31 family - W31DF

The world-class efficiency of Wärtsilä 31DF reduces your fuel consumption, environmental footprint and costs – all while providing the fast-start capabilities to provide the flexibility you need to integrate increased levels of renewables into your power system.

The Wärtsilä 31DF engine power plant solution provides energy security through fuel flexibility, switching seamlessly between liquid and gaseous fuels, increasing resilience in times of unpredictable fuel supply. Additionally, the modular design of the power plant means you’re prepared for using renewable fuels.


DOWNLOAD LEAFLET




Wärtsilä 31SG

– gas engine power plant solution.
31 family - W31SG
The Wärtsilä 31SG gas engine generating set offers both the highest available open-cycle efficiency as well as unparalleled dynamic capabilities. The Wärtsilä 31SG’s outstanding efficiency enables a reduced environmental footprint and a lower total cost of ownership.

Specifically designed for flexible power generation, this generating set is a tool allowing for the integration of high levels of energy from renewable sources. It creates a balancing link between power generation and consumption, thus providing effective system level resilience.

The Wärtsilä 31SG is typically installed in medium sized de-centralized power plants having multi-engine configurations to provide a plant net load of from 20 to 200 MW.

DOWNLOAD LEAFLET




Wärtsilä 31

– liquid engine power plant solution.
31 family - W31 Diesel
Power plants based on the high-efficiency Wärtsilä 31 diesel engines are suitable for locations where gas is not available yet. The modular design of this solution supports future fuel conversions for gaseous fuels.

DOWNLOAD LEAFLET

    Wärtsilä 31DF



    31 family - W31DF

     
    Plant output 10-400 MW
    Configuration 1-37 x 20V31DF
     

    Wärtsilä 31DF

    – multi-fuel engine power plant solution.

    The world-class efficiency of Wärtsilä 31DF reduces your fuel consumption, environmental footprint and costs – all while providing the fast-start capabilities to provide the flexibility you need to integrate increased levels of renewables into your power system.

    The Wärtsilä 31DF engine power plant solution provides:

    • Energy security through fuel flexibility.
    • Switches seamlessly between liquid and gaseous fuels.
    • Increases resilience in times of unpredictable fuel supply.
    • Additionally, the modular design of the power plant means you’re prepared for using renewable fuels, Power-to-X. 
     
    DOWNLOAD LEAFLET

    Wärtsilä 31SG



    31 family - W31SG

     
    Plant output  20-200 MW
    Configuration 2-18 x 20V31SG
     

    Wärtsilä 31SG

    – gas engine power plant solution.

    DOWNLOAD LEAFLET

    The Wärtsilä 31SG gas engine generating set offers both the highest available open-cycle efficiency as well as unparalleled dynamic capabilities. The Wärtsilä 31SG’s outstanding efficiency enables a reduced environmental footprint and a lower total cost of ownership. Specifically designed for flexible power generation, this generating set is a tool allowing for the integration of high levels of energy from renewable sources. It creates a balancing link between power generation and consumption, thus providing effective system level resilience.

    The Wärtsilä 31SG is typically installed in medium sized de-centralized power plants having multi-engine configurations to provide a plant net load of from 20 to 200 MW.

    • The highest simple-cycle efficiency.
    • Fast start-ups, load changes and shutdowns allow the flexibility needed to balance renewable penetration.
    • Full power achieved with a variety of gaseous fuels, without impacting the operation.
    • The modular design of the W31 engine family enables easy conversions between pure gas, multi-fuel and liquid fuel variants, and can be adapted to run on renewable fuels.

    Wärtsilä 31



    31 family - W31 Diesel

    Wärtsilä 31

    – liquid engine power plant solution.

    Power plants based on the high-efficiency Wärtsilä 31 diesel engines are suitable for locations where gas is not available yet. The modular design of this solution supports future fuel conversions for gaseous fuels.

    Plant output  50-400 MW
    Configuration 3-36 x 20V31
    DOWNLOAD LEAFLET






    The highest efficiency internal combustion engine


    • Digitally controlled fuel injection

    •     Fully adjustable semi-hydraulic valve actuation (VIC/VEC)
        - Variable inlet valve timing
        - Variable exhaust valve timing

    •     2-stage turbocharging system

    •     New generation UNIC engine control system


    Wärtsilä 31-Efficiency


    Turbocharging system


    •  2-stage turbocharging enables high efficiency throughout the entire load range

    •  Serviceability improved by use of cartridge concept for compressor and turbine removal

    Turbocharging system


    2-stage turbocharging system enables higher efficiency and improved operating flexibility

    Quality focused product development


    Quality focused product development process – 5 years project






    Engine R&D

     
    Wärtsilä's R&D team has worked hard for many years to develop this state-of the-art engine.

    The core of the design is based on Wärtsilä’s long and strong market knowledge and understanding of customer needs. Quality has been the basis of the R&D process from the very first steps.

     






    Worry-free project execution and plant ownership

    We offer engineering, procurement and construction solutions as well as fast track installation due to our modular design and pre-fabricated products. With our lifecycle solutions you get guaranteed operational reliability and efficiency, backed up by expert advice on optimising the operation and maintenance of your power system.

    Performance targets are agreed upon on measured data. The performance of your installations during the lifecycle can be optimised for example through upgrades, modernisations and fuel conversions. By partnering with us, you can worry less and focus more on your core business.

                                 






    Downloads

    Wärtsilä 31DF leaflet »
    Wärtsilä 31SG leaflet »
    Wärtsilä 31 leaflet »
    Flexible combined heat and power & trigeneration solutions »



    Webinar:


    Wärtsilä 31DF − future-proof your power generation with this modular plant solution

    Wärtsilä 31DF − Webinar

    Watch this webinar recording to learn how the newly launched, fuel-flexible Wärtsilä 31DF plant solution provides the needed balancing flexibility to integrate these increased levels of renewables. Plus see how it secures the reliability of your power system.

    WATCH NOW

    References

    •
      Benndale, Missisippi, USA
      Enabling an increase in variable generation with more flexible capacity that can rapidly start up when needed.

      Benndale, Missisippi, USA
    • DREWAG, Germany
      Wärtsilä’s state-of-the-art gas engine technology will provide flexibility and black start capability to DREWAG, the local utility company in Dresden, Germany. The combined heat and power (CHP) engine power plant will produce electricity and district heating simultaneously. Upon completion, it will be the only power plant that can restart the Dresden grid in case of a power blackout.

      DREWAG, Germany
    • Bremen, Germany
      Wärtsilä and Uniper enable a revenue-adding transition from coal to gas for public utility swb Erzeugung in Bremen, Germany. When delivered in mid-2022, the flexible CHP power plant will decrease swb’s CO2 emissions by up to 75%.

      Bremen, Germany

    Press releases

     

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