Boil-off gas removal system
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United States of America Patent
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Issued Date -
Feb 16, 2006
app pub date -
Aug 12, 2004
filing date -
Aug 12, 2004
priority date (Note) -
Abandoned
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Abstract
In a new boil-off gas removal system for a liquid storage tank, boil-off vapor from the storage tank is first pressurized in the low-stage compressor. The pressurized vapor may be cooled to near cryogenic temperature in a cooler that can include a preliminary cooler and/or a high-pressure gas exchanger in which the pressurized vapor is cooled against boil-off vapor. The pressurized vapor may also be cooled by the addition of cryogenic liquid through a branch on the liquid supply line running from the low-stage pump in the storage tank. The cooled, pressurized vapor is directed to a heat exchanger where the cool, pressurized vapor travels in a path in which it is condensed against cryogenic liquid that travels in another, separate path.
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