| 摘要 |
METHOD AND APPARATUS PRODUCING A LNG STREAM, WHEREIN BEFORE LIQUEFACTION HEAVIER HYDROCARBON COMPONENTS ARE REMOVED FROM A NG STREAM TO BE LIQUEFIED, THE METHOD AT LEAST COMPRISING THE STEPS OF: - PROVIDING A VAPOROUS FEED STREAM (1) OF NATURAL GAS; - FEEDING THE FEED STREAM (1) INTO A DISTILLATION COLUMN (10); - DRAWING A BOTTOM STREAM (17) AND AN OVERHEAD STREAM (16) FROM THE DISTILLATION COLUMN (10); AND - LIQUEFYING AT LEAST A PART OF THE OVERHEAD STREAM (16) THEREBY OBTAINING A LNG STREAM; WHEREIN THE STEP OF FEEDING THE FEED STREAM (1) INTO THE DISTILLATION COLUMN (10) COMPRISES THE SUB STEPS OF: SPLITTING THE FEED STREAM (1) INTO FIRST (3A) AND SECOND (3B) SUBSTREAMS; FEEDING THE FIRST SUHSTREAM (3A) INTO THE DISTILLATION COLUMN (10) VIA A FIRST FEED POINT (7A), AT A PRESSURE NOT LOWER THAN THE FEED STREAM PRESSURE MINUS A PRESSURE DROP BROUGHT ABOUT BY THE SAID SPLITTING OF THE FEED STREAM (1); COOLING THE SECOND SUBSTREAM (3B); AND FEEDING THE COOLED SECOND SUBSTREAM (7) INTO THE DISTILLATION COLUMN (10) AT A SECOND FEED POINT (7B) OVERHEAD OF THE FIRST FEED POINT (7A).
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