| 摘要 |
Method and apparatus for achieving high yields of high purity N2 and optional coproduct O2 at lower energy and capital cost than heretofore possible are disclosed. Referring to FIG. 1, in a dual pressure configuration comprised of a rectifier (105) and a column (102), warm companded air from a compressor (118) provides bottom reboil at the reboiler (103), and the liquid air is split to reflux both columns. The refrigeration expander (112), driven by expansion of waste O2, provides the power for the compressor (112). Also kettle liquid is distilled into two vapor streams by a contact zone (107) before feeding to the column (102). |
