Recent Developments of the Reversing Exchanger
The application of the reversing exchanger to air separation for. air purification and chilling was described in 1947 by Lobo and Skaperdas , The exchanger which they had successfully tested was a ribbon-packed, multiple-annulus-type exchanger introduced by Collins in 1946. The packing and tubes were of copper and soldered together. Air, at a pressure of about 7 atm, flowed through one concentric passage in countercurrent heat exchange with low-pressure waste nitrogen in a second concentric passage, oxygen in a nonreversing third passage, and a so-called unbalance stream in a nonreversing fourth passage (see Fig. 1). A more complete description of the construction and design details of the Collins tubes was given by Trumpler and Dodge , While the Collins-type exchanger gave satisfactory performance, it had certain shortcomings. It was fairly expensive as a result of its construction. In addition, the capacity of each tube was small, and thus, for a large -tonnage plant, an unattractively high number of tubes must be placed together in parallel.
KeywordsWaste Nitrogen Cold Stream Tubular Element Oxygen Plant Hexagonal Configuration
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