Equipment and process for liquefaction of LNG boiloff gas
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United States of America Patent
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Nov 10, 2009
Grant Date -
Jun 25, 2009
app pub date -
Feb 19, 2009
filing date -
May 8, 2006
priority date (Note) -
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Abstract
A design for equipment and process for reliquefaction of LNG boiloff gas, primarily for shipboard installation, has high thermodynamic efficiency and lower capital cost, smaller size (volume, footprint), lower weight, and less need for maintenance than systems utilizing the prior art. The main refrigerant gas compressor is reduced to a single stage turbocompressor. Optional elements include: compression of boiloff gas at ambient temperature; compression of boiloff gas in one or two stages; turboexpansion of refrigerant gas incorporating one or two turboexpanders; turboexpander energy recovery by mechanical loading, compressor drive, or electric generator; refrigerant sidestream for cooling at the lowest temperatures.
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