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20 Chapter 3 Heat exchanger design and construction construction method and its results are presented. 3.2 The reversing heat exchanger 3.2.1 Operating principles The reversing heat exchanger in its simplest form, is a two channel counterflow heat exchanger in which an impure feed gas at high pressure is cooled by the pure product gas at a lower pressure. Automatic valves at either end periodically switch the two gas streams between channels so that the impurities deposited by the high pressure feed stream are re-vaporised by the low pressure product, without interfering with the heat transfer duty of the unit. The application of reversing heat exchangers to air purification in air separation plants has been described by Lobo and Skaperdas[63]. A detailed description of construction and design details of a reversing heat exchanger are given by Tn:tmpler and Dodge[64]. Denton and Ward[65] have given design details for plate-fin heat exchangers to be used as reversing heat exchangers. Figure 3.1 Cold end tt ~i::l---' ' - - - - Raw air Schematic of typical reversing heat exchanger as used in air separation plant. The complete re-vaporisation of the deposited impurity depends on: • the difference in pressure between the streams, since this determines the partial pressures and effects the mass transfer rate; • the temperature difference between the two streams, SInce this effects the Warm end O2 not reversingPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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