LNG Vapor Handling Configurations And Methods
First Claim
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1. A system for transfer of LNG from an LNG carrier to an LNG storage tank comprising an exchanger that is configured to subcool the LNG coming from the carrier using refrigeration content of sendout LNG and the condensed and expanded boil-off from the LNG storage tank.
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Abstract
LNG from a carrier is unloaded to an LNG storage tank in configurations and methods in which expansion of compressed and condensed boil-off vapors from the LNG storage tank provide refrigeration to subcool the LNG that is being unloaded. Most advantageously, such configuration and methods reduce the amount of boil-off vapors and eliminate the need for a vapor return line and associated compressor.
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Citations
20 Claims
- 1. A system for transfer of LNG from an LNG carrier to an LNG storage tank comprising an exchanger that is configured to subcool the LNG coming from the carrier using refrigeration content of sendout LNG and the condensed and expanded boil-off from the LNG storage tank.
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8. A plant comprising:
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an LNG source that is configured to provide an LNG stream and that is fluidly coupled to an LNG storage tank that is configured to provide a sendout LNG and an LNG vapor; a compressor, and a condenser or absorber fluidly coupled to the LNG storage tank and configured to receive the LNG vapor and to provide a pressurized sendout LNG liquid; a pressure reduction device configured to reduce pressure of the pressurized sendout LNG liquid; and a heat exchanger that is configured to subcool the unloaded LNG stream using the depressurized sendout LNG liquid from the pressure reduction device. - View Dependent Claims (9, 10, 11)
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12. A method of transferring an LNG stream from an LNG source comprising:
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forming a pressurized sendout LNG liquid from a vapor of an LNG storage tank, and depressurizing the pressurized sendout LNG liquid; and cooling the LNG stream using a heat exchanger that receives refrigeration content from the depressurized sendout LNG liquid. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification