• IMG 9659
    IMG 9659
  • Wärtsilä LNG mini-scale Liquefaction
    IMG 0028
  • Wärtsilä LNG mini-scale Liquefaction
    IMG 0083

LNG Plants – Mini Scale Liquefaction Technology

MIXED REFRIGERANT (MR) PROCESS - THE PERFECT SOLUTION FOR BIOGAS LIQUEFACTION

Wärtsilä offers the energy efficient Mixed Refrigerant (MR) liquefaction technology for low liquefaction capacities. Together with our fast track engineering model, this technology results in low investment costs and short manufacturing time.

The liquefier system uses mixed refrigerant technology, where one single MR compressor and one aluminum plate-fin heat exchanger (PFX) are the main components in the system. A standard chiller (pre-cooling unit) is incorporated to improve energy efficiency and to ensure stable operation of the MR process.

Wärtsilä provides the basic complete process package, to which can be added civil engineering and construction services. The complete plant can also be supplied as an EPC delivery. Once installed, Wärtsilä further offers Operation & Maintenance agreements that are tailored to the customer's specific needs.

    Technical data

    Main Technical data:

    • Energy consumption: ~ 0.7 kWh/kg LNG
    • Capacities up to 50 tons/day
    • Based on Mixed Refrigerant technology
    • Designed for unmanned operation
    • Space requirement for liquefaction system: 15x15 m2
    • Delivery time: 11 months
    • Standard capacities: 10, 17 and 25 ton LNG/day
    • Using standard and robust components
     
    Mini scale Liquefaction
    Applications

    The Mixed Refrigerant  technology can be used with a variety of small gas sources:

    • Biogas
    • Coal bed methane – CBM
    • Pipeline gas
    • Flare gas recovery
    • Landfill gas

    Each type of gas needs to be cleaned to achieve low water content (1 ppm), and low amounts of CO2 (<50 ppm) and H2S (< 4ppm). Gas cleaning systems can also be delivered by Wärtsilä upon request.

    The biogas liquefaction plant pictured beside was delivered to the municipality of Oslo. For this plant, Wärtsilä also delivered a mole sieve adsorption system for CO2 (2-subscript not superscript) cleaning stage.

    EGE Plant
    Key benefits

    Key advantages of the Mixed Refrigerant technology include:

    • Low power consumption – reducing OPEX
    • All components are conventional and of robust technology – reducing CAPEX
    • Designed for unmanned operation
    • Local control of LNG export - truck driver can load without assistance from main control room
    • Robust main rotating machinery with high efficiency – oil flooded screw compressor
    • Simple energy supply, only electric power source needed
    • Easy start up and shut down of all systems
    • Short delivery time
    • Easy shipment
    • Plug and play philosophy, skid based - relocation possible.
    Methane Number

    Wärtsilä Methane Number Calculator

    We have developed this tool for ship owners and operators to calculate the Methane Number of the fuel gas.
    The calculation result indicates whether or not the given gas quality is suitable for use in Wärtsilä dual-fuel engines.

    Methane CH4
    		mol%
    EthaneC2H6
    		 mol%
    PropaneC3H8
    		 mol%
    Iso-butane (2-Methylpropane)i-C4H10
    		 mol%
    N-butanen-C4H10
    		 mol%
    Iso-pentane (2-Methylbutane)i-C5H12
    		 mol%
    N-pentanen-C5H12
    		 mol%
    EthyleneC2H4
    		 mol%
    PropyleneC3H6
    		 mol%
    Neo-pentane (2,2-Dimethylpropane) neo-C5H12
    		 mol%
    Mix-hexaneMix C6H14
    		 mol%
    Mix-heptaneMix C7H16
    		 mol%
    N-Octanen-C8H18
    		 mol%
    Carbondioxide C02
    		 mol%
    CarbonmonoxideC0
    		 mol%
    HydrogenH2
    		 mol%
    Nitrogen N2
    		 mol%
    Hydrogen sulfideH2S
    		 mol%
    Total mol%
    Wärtsilä Methane number (WMN)
    Propane Knock Index (PKI)
    The calculation tool is owned by Wärtsilä and is made for customer use and is for guidance only. Changes in the tool is reserved at any time.

    Press releases

    Articles

    Multipurpose biogas
    Renewable gas is one of the most environmentally sound alternative energy sources. Wärtsilä Hamworthy’s...
    22 November 2013
    • Twentyfour7. article

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