초록 ▼

A system, especially useful under cryogenic conditions, for downflowing cocurrent condensation of vapor against downflowing partially vaporizing liquid, wherein the condensing vapor flows within tubes having fluted internal surfaces and the boiling liquid flows along the outer surfaces of the tubes

A system, especially useful under cryogenic conditions, for downflowing cocurrent condensation of vapor against downflowing partially vaporizing liquid, wherein the condensing vapor flows within tubes having fluted internal surfaces and the boiling liquid flows along the outer surfaces of the tubes having re-entrant cavities.

대표청구항 ▼

1. A method for carrying out cryogenic air separation comprising: (A) separating feed air within a higher pressure column by cryogenic rectification to produce nitrogen-enriched vapor and oxygen-enriched fluid, passing oxygen-enriched fluid from the higher pressure column into a lower pressure colum

1. A method for carrying out cryogenic air separation comprising: (A) separating feed air within a higher pressure column by cryogenic rectification to produce nitrogen-enriched vapor and oxygen-enriched fluid, passing oxygen-enriched fluid from the higher pressure column into a lower pressure column, and producing by cryogenic rectification oxygen-rich liquid within the lower pressure column; (B) passing nitrogen-enriched vapor into a plurality of vertically oriented tubes, said tubes each having a fluted internal surface and an outer surface having a plurality of cavities; (C) passing nitrogen-enriched vapor downwardly within the tubes, passing oxygen-rich liquid downwardly along the outer surfaces of the tubes, and condensing nitrogen-enriched vapor by indirect heat exchange with partially vaporizing oxygen-rich liquid to produce oxygen-rich vapor and remaining oxygen-rich liquid; and (D) recovering at least some of at least one of the oxygen-rich vapor and remaining oxygen-rich liquid as product oxygen.