A HIGH CAPACITY FLOATING LNG DESIGN

摘要

The Prelude FLNG solution is capable of processing rich gas. Developments with rich gas using similar facilities may also benefit from the considerable amount of revenue possible from condensate and LPG. However, some fields have gas that is significantly leaner, and will not have the benefit of condensate and LPG revenue streams. To ensure robust and economic development of gas fields with lean gas compositions, Shell has developed FLNG Lean. FLNG Lean is an FLNG concept with a nominal LNG production capacity of 6 million tonnes per annum and reduced functionality for other liquids. FLNG Lean is a natural development of the Shell FLNG design selected for Prelude. The substructure design with its utilities, the accommodation, the operating and the safety philosophies, the flare and blow-down system, the cooling water systems, the LNG containment systems, the LNG off loading system, and the turret and mooring system design are all the same, enabling repeatability gains. Lessons learnt and the latest technology developments have also been implemented. Some utilities are relocated to the substructure to create sufficient deck space for the liquefaction trains and process equipment. Modern aero-derivative gas turbines will drive the liquefaction compressors and power generators. All process heating requirements will be met by waste heat recovery units. This paper will describe the FLNG Lean design and its application area. We will first describe the economic drivers, then highlight the approach followed, explain the main features of FLNG Lean, compare it with Prelude, and conclude with an outlook on the future of FLNG.