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: 12 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.

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