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Chapter 2. Pressure Swing Adsorption Processes Figure 2.6: Rotary valve based pressure swing adsorption system from Xebec Adsorption Inc. beaded adsorbent employed in the conventional PSA systems, this configuration uses structured adsorbents to allow very high fluid velocity across the packed bed. Consequently, hardware safety mechanism are installed to avoid fluidization. At the heart of the technology is the rotary valve system to direct flow between the beds during the PSA cycle, which is in sharp contrast to the switching valve method employed in the traditional PSA system. The combination of structured adsorbent and rotary valve set up paves the way for very fast PSA cycles, with a fraction of size of a more conventional PSA system. 2.4 Detailed Description of PSA Cyclic Opera- tion In order to gain further understanding of the PSA periodic operation, each pro- cessing step of the PSA cycle shown in Figure 2.5 is explained here in detail. The steps mentioned here are depicted in Figure 2.7, left to right, for further clarity. 1. Adsorption with feed: The feed gas mixture enters the feed of the column. The product gas con- 38PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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