Nitrogen rejection and liquifier system for liquified natural gas production
OwnerRustam H. SETHNA, Guillaume PAGESinventors
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Abstract
A method for recovering liquefied natural gas from a gas mixture containing natural gas and impurities by subjecting the natural gas to a series of steps beginning with feeding a natural gas stream containing impurities to a nitrogen rejection unit; feeding the purified natural gas stream to a liquefier heat exchanger; expanding the liquefied natural gas and feeding the expanded liquefied natural gas to a flash vessel; flashing the liquid natural gas and separating the liquefied natural gas from the flash gas; and feeding the liquefied natural gas to storage and the flash gas to the nitrogen rejection unit.
Claims32
A method for recovering liquefied natural gas comprising the steps:
- feeding a natural gas stream containing impurities to a nitrogen rejection unit;
- feeding the purified natural gas stream to a liquefier heat exchanger;
- expanding the liquefied natural gas and feeding the expanded liquefied natural gas to a flash vessel;
- flashing the liquid natural gas and separating the liquefied natural gas from the flash gas;
- and
- feeding the liquefied natural gas to storage and the flash gas to said nitrogen rejection unit.
A method for recovering liquefied natural gas comprising the steps:
- feeding a natural gas stream containing impurities to a nitrogen rejection unit;
- feeding the purified natural gas stream to a liquefier heat exchanger;
- expanding the liquefied natural gas and feeding the expanded liquefied natural gas to a flash vessel;
- flashing the liquid natural gas and separating the liquefied natural gas from the flash gas;
- recovering refrigeration from said flash gas;
- and
- feeding the liquefied natural gas to storage and the flash gas to said nitrogen rejection unit.
An apparatus comprising a nitrogen rejection unit, a liquefier heat exchanger and a flash vessel.
Dependencies are inferred from the claim text.