| 摘要 |
Method gas liquefaction which comprises cooling a feed gas stream successively through at least two heat exchange zones, wherein cooling is provided by respective vaporizing refrigerants, and wherein the refrigerant in the coldest temperature range is only partially vaporized in the coldest heat exchange zone and then is vaporized in a further heat exchange zone at temperatures above the highest temperature of the coldest heat exchange zone to form a totally vaporized refrigerant. The totally vaporized refrigerant is compressed to yield a compressed refrigerant stream, and the entire compressed refrigerant stream is either (i) cooled by indirect heat exchange in the further heat exchange zone, thereby providing self-refrigeration for the recirculating refrigeration process, or (ii) cooled in a heat exchange zone preceding the coldest heat exchange zone by indirect heat exchange with a respective vaporizing refrigerant and then further cooled the in the further heat exchange zone. |
