integrated nitrogen removal in liquefied natural gas production using dedicated reinjection circuit

摘要

Patent summary: "Nitrogen removal integrated into the production of liquefied natural gas using dedicated reinjection circuit". The present invention relates to a method and apparatus for liquefying a natural gas feed stream and removing nitrogen from it to produce a nitrogen-depleted lng product in which a natural gas feed stream is passed through the heat exchanger. to produce a first lng stream that is separated to form a nitrogen-depleted lng product and a recycle stream composed of nitrogen-enriched natural gas vapor, and wherein the recycle stream is passed through the main heat exchanger. to produce a first lng stream, separately and in parallel with the natural gas feed stream, to produce a first at least partially liquefied nitrogen-enriched natural gas stream that is separated to provide a nitrogen rich vapor product.