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Thermo! convection Top f product 35 l Bottom product current v (<■) Hot wire- Feed (b) Thermal-diffusion equipment, reflux methods, (a) Flat plate batch thermogravitational column without reservoirs, (b) Hot-wire batch thermogravitational column with reservoirs, (c) Concentric-cylinder batch ther mogravitational column without reservoirs, (d) Continuous-flow thermogravitational column. SOURCE: Chemical Engineers’ Handbook, John H. Perry 1963 Figure 36-2. (a-d). Possible Configurations of Thermal Diffusion Equipment Source: Used with permission of McGraw-Hill Book Company. The hypothetical flat-plate thermal diffusion column was optimized at first for flow- rate per unit of column width, as shown in Figure 36-3. A 20-stage column was then assumed and the relative area per stage was determined for an increase in CO^ content in a purged stream from 1% CO^ from the battery to a 99.9% C02 at the out let. These results are illustrated in Figure 36-4. The area of surface for the total column with two flat plates bounding each channel then was calculated as a function of gap between plates and temperature differences. The area and resulting heat load for convection and radiation is shown in Figure 36-5. Not shown in the figures is the optimum gap width which ranged from 0.10 inches to 0.15 inches, and the column height which totaled less than a foot. The column was short due to the relatively large differences in molecular weight of the separated species, and due to the fact that the column was optimized for length as a first step in the calculation. 36-7PDF Image | Development of the Zinc-Chlorine Battery for Utility
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