| 摘要 |
<p>Air is purified by being passed in sequence through a first, lower, bed 4 of activated alumina particles which adsorb water vapour preferentially therefrom, and a second, upper, bed 6 of zeolite 13X molecular sieve particles which adsorb carbon dioxide preferentially therefrom. The air passes upwardly through the first bed 4 and downwardly through the second bed 6. Once fully loaded with the adsorbed components, the beds 4 and 6 are regenerated by the passage therethrough of hot regeneration gas. One part of the regeneration gas flows downwardly through the first bed 4; another part flows upwardly through the second bed 6. The hot regeneration gas causes the previously adsorbed components to be desorbed. Once regeneration has ended, and the beds have returned to their adsorbing temperature, they may be used again to purify air. <IMAGE></p> |
