| 摘要 |
Novel polybed VPSA process and system to achieve enhanced O2 recovery are disclosed. The VPSA process comprises using three or more adsorber beds; pr oviding a continuous feed supply gas using a single feed blower to one bed, wherein at any instant during the process, two beds are in an evacuation ste p and only one bed is in a feed mode; and purging the adsorber beds using tw o purge gases of different purity. The VPSA cycle may further comprise utili zing a storage device (e.g., a packed or empty equalization tank) to capture void gases during co-current depressurization step of the VPSA cycle, which is used at a later stage for purging and repressurization of the bed. In ad dition, the VPSA process employs a single feed compressor and two vacuum pum ps at 100% utilization. Furthermore, the use of the storage device minimizes the use of product quality gas for purging. About 10-20% improvement in O2 productivity is realized in the new VPSA process.
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