TOYO has developed the LiBro® FLNG concept with MODEC, Inc. (MODEC) and ClassNK as an economical solution for monetizing remote stranded offshore gas fields. The LiBro® FLNG concept applies MODEC's LiBro® Technology and Air Products' Triple N2 Expander Liquefaction Technology (Air Products® AP-N LNG Process).

Process Feature

The LiBro® unit, Lithium Bromide based Absorption Refrigeration unit, is integrated with Air Products® AP-N LNG Process and the chilled water produced in the LiBro® unit is used for precooling of the natural gas and cooling of N2 refrigerant for improved LNG train efficiency. Produced chilled water is also used for cooling of the gas turbine combustion air for maximizing output of gas turbine driver. With the LiBro® unit integration, the overall efficiency of LNG train is improved, greater gas turbine power is made available, and increased LNG production capacity with the gas turbines selected is achieved.

Safety Consideration

The LiBro® FLNG concept involves N2 as refrigerant for natural gas liquefaction. N2 is a non-flammable fluid and much safer compared to mixed hydrocarbon refrigerants. Air Products' Coil Wound Heat Exchanger (CWHE) is used as the main heat exchanger for natural gas liquefaction. Air Products' CWHE is widely applied with its robust design and high reliability. For the LiBro®v FLNG concept, the CWHE shell is mechanically designed to withstand natural gas supply pressure against coil rupture scenarios.

Cost Effectiveness

Utilization of an existing standard shipbuilding hull design as the basis will contribute to significant cost savings compared to a purpose designed and built hull. Air Products® AP-N LNG Process which uses non-flammable N2 refrigerant will allow a more compact topside design on the limited available deck space for topside equipment and piping because of reduced safety corridor requirements. In addition, the LNG production capacity can be maximized by the integration of the LiBro® unit.
The LiBro® unit is compact and can be installed beneath the gas turbines. No additional deck space is required for installation. For the typical gas composition from an offshore gas field, the standard hull design (300 m x 50 m) will accommodate the topside facilities with LNG production capacity of 2.0 MTPA and LNG storage capacity of 160,000 m3.

Early Delivery

The Shipyard-friendly design is adapted to the hull design of the LiBro® FLNG concept. Conversion of standard shipbuilding bulk carrier, instead of special purpose built hull, is considered as the basis of the LiBro® FLNG concept in order to realize early delivery. IHI Marine United Inc’s SPB (Self-Supporting Prismatic-Shape IMO Type B) Tank, which features (1) wide & flat upper deck to enable installation of the topside plant and (2) no sloshing with internal bulkheads construction to enable partial cargo operation, are installed into the cargo space as LNG product storage and will also contribute to its early delivery.
The LiBro® FLNG concept can be applied to both new built hull and existing hull conversions.

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