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Waste Product of other PSA trains Feed Waste Purge F R BD Pu FP F D BD P FP First PSA stage Feed Second PSA stage Feed CO2 to compression and storage Product Feed Bed 1 F R BD PuFP Bed 2 BD Pu FP F R BD Bed 3 R BD PuFP F Bed 1 FP F D BD P Bed 2 BD PFP F D Figure 4. PSA processes for the post-combustion scenario. Representation of the sequence of steps undergone by a single column in the first and second PSA stage. H2-rich CO2-rich Purge Feed CO2-rich Feed F D X4 BD Pu P X4 N X4 FP Bed 1 FP F D1 D2 D3 D4 BD Pu P4 N P3 N P2 N P1 N Bed 2 P2N P1 N FP F D1 D2 D3 D4 BD Pu P4 N P3 NP2 Bed 3 N P3 N P2 N P1 N FP F D1 D2 D3 D4 BD Pu P4 Bed 4 Pu P4 N P3 N P2 N P1 N FP F D1 D2 D3 D4 BD Pu Bed 5 BD Pu P4 N P3 N P2 N P1 N FP F D1 D2 D3 D4 Bed 6 D2 D3 D4 BD Pu P4 N P3 N P2 N P1 N FP F D1D2 Bed 7 F D1 D2 D3 D4 BD Pu P4 N P3 N P2 N P1NFP F Figure 5. PSA process for the pre-combustion scenario. Representation of the sequence of steps undergone by a single column. 3.3. Water and adsorption Presence of water is often troublesome in PSA processes. Water competitively adsorb on the solid sorbents and tend to accumulate since classical pressure swing operation may be not sufficient to desorb it. Both zeolites and activated carbons have demonstrated to experience this negative effect (zeolites appears to be more sensible to water presence). Few studies really dealt with this issue in detail when analyzing the suitability of CO2 capturePDF Image | Evaluating Pressure Swing Adsorption as a CO2 separation technique in coal-fired
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