| 摘要 |
1516478 Air rectification LINDE AG 5 Aug 1976 [6 Aug 1975] 32609/76 Heading F4P In a rectification process in which air is cooled in heat exchangers 2 and fed to the h.p. stage 4 of a two-stage rectification column, and product oxygen is withdrawn from the 1.p. stage 6 via line 5 and heated in a further heat exchanger 8 by a gas stream 11 being fed to the h.p. stage 4, a compensating gas stream 17 is withdrawn from the h.p. stage 4 heated, at least in part, in the h.e.'s 2 recooled in h.e. 8 and expanded in at least one turbine 21. As shown, the gas stream 17 is an air mixture, a portion 20 of which is warmed in parallel with the oxygen product in h.e. 8 before rejoining the balance at 22. A nitrogen stream 9 taken from the top of the h.p. stage 4 forms the gas stream ] 1 after warming in h.e.'s 2 and compression at 10, the stream 11 then being expanded back into h.p. stage 4. Two streams 12, 13 are taken from h.p. stage 4, cooled and expanded into 1.p. stage 6 and gaseous nitrogen is removed at 16. In a modification, Fig. 2 (not shown), the compensating gas stream is a portion of the nitrogen stream 9.
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