Methods of natural gas liquefaction and natural gas liquefaction plants utilizing multiple and varying gas streams
First Claim
1. A method of natural gas liquefaction, comprising:
- directing a gaseous natural gas process stream comprising carbon dioxide and a cooling stream into a plant;
cooling the gaseous natural gas process stream by transferring heat from the gaseous natural gas process stream to the cooling stream;
expanding the cooled gaseous natural gas process stream to form a liquid natural gas process stream, a solid carbon dioxide portion suspended in the liquid natural gas stream, and a first tail gas stream comprising a gaseous natural gas;
separating the solid carbon dioxide portion from at least a portion of the liquid natural gas process stream to provide a substantially pure liquid natural gas;
sublimating the solid carbon dioxide;
directing the first tail gas stream out of the plant at a first pressure;
directing the sublimated carbon dioxide out of the plant in the first tail gas stream;
separating a secondary liquid natural gas stream from the liquid natural gas process stream and vaporizing the secondary liquid natural gas stream with a heat exchanger to form a second tail gas stream comprising gaseous natural gas; and
directing the second tail gas stream out of the plant at a second pressure, the second pressure different than the first pressure of the first tail gas stream.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of natural gas liquefaction may include cooling a gaseous NG process stream to form a liquid NG process stream. The method may further include directing the first tail gas stream out of a plant at a first pressure and directing a second tail gas stream out of the plant at a second pressure. An additional method of natural gas liquefaction may include separating CO2 from a liquid NG process stream and processing the CO2 to provide a CO2 product stream. Another method of natural gas liquefaction may include combining a marginal gaseous NG process stream with a secondary substantially pure NG stream to provide an improved gaseous NG process stream. Additionally, a NG liquefaction plant may include a first tail gas outlet, and at least a second tail gas outlet, the at least a second tail gas outlet separate from the first tail gas outlet.
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Citations
18 Claims
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1. A method of natural gas liquefaction, comprising:
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directing a gaseous natural gas process stream comprising carbon dioxide and a cooling stream into a plant; cooling the gaseous natural gas process stream by transferring heat from the gaseous natural gas process stream to the cooling stream; expanding the cooled gaseous natural gas process stream to form a liquid natural gas process stream, a solid carbon dioxide portion suspended in the liquid natural gas stream, and a first tail gas stream comprising a gaseous natural gas; separating the solid carbon dioxide portion from at least a portion of the liquid natural gas process stream to provide a substantially pure liquid natural gas; sublimating the solid carbon dioxide; directing the first tail gas stream out of the plant at a first pressure; directing the sublimated carbon dioxide out of the plant in the first tail gas stream; separating a secondary liquid natural gas stream from the liquid natural gas process stream and vaporizing the secondary liquid natural gas stream with a heat exchanger to form a second tail gas stream comprising gaseous natural gas; and directing the second tail gas stream out of the plant at a second pressure, the second pressure different than the first pressure of the first tail gas stream. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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6. A method of natural gas liquefaction, comprising:
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directing a gaseous natural gas process stream comprising carbon dioxide and a cooling stream into a plant; cooling the gaseous natural gas process stream by transferring heat from the gaseous natural gas process stream to the cooling stream; expanding the cooled gaseous natural gas process stream to form a liquid natural gas process stream, a solid carbon dioxide portion suspended in the liquid natural gas process stream, and a first tail gas stream comprising a gaseous natural gas; separating the solid carbon dioxide portion from at least a portion of the liquid natural gas process stream to provide a substantially pure liquid natural gas; directing the solid carbon dioxide portion suspended in the liquid natural gas process stream into a transfer tank; directing a transfer motive gas into the transfer tank to direct the solid carbon dioxide portion directing a transfer motive gas into the transfer tank to direct the solid carbon dioxide portion suspended in the liquid natural gas process stream into a hydrocyclone; sublimating the solid carbon dioxide; directing the first tail gas stream out of the plant at a first pressure; directing the sublimated carbon dioxide out of the plant; directing gases from the transfer tank out of the plant in the first tail gas stream; separating a secondary liquid natural gas stream from the liquid natural gas process stream and vaporizing the secondary liquid natural gas stream with a heat exchanger to form a second tail gas stream comprising gaseous natural gas; and directing the second tail gas stream out of the plant at a second pressure, the second pressure different than the first pressure of the first tail gas stream. - View Dependent Claims (7, 18)
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Specification