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The other power consumptions evaluated are very similar in both cases, so they do not modify the picture outlined. Summing up, the CO2 capture through a PSA unit shifts the power consumption from the capture process to the CO2 compression, while all the other power loss contributions remain almost unchanged. However, the increase in the compression power results to prevail. Accordingly the energy efficiency penalty relative to the PSA case is slightly higher than that relative to the absorption case. Table 8. Main outputs of the full-plant analysis in the pre-combustion scenario. Plant summary Power inputs Coal flow rate [kg/s] Coal LHV [MJ/kg] Net fuel input [MWth] Power outputs Gas turbine output [MW] Steam turbine output [MW] Air expander output [MW] Gross electric output [MW] CO2 separation power consumption [MW] CO2 compression power consumption [MW] ASU power consumption [MW] Miscellaneous auxiliaries [MW] Total auxillary power consumption [MW] Net electric output [MW] Plant performance Net electric efficiency [%] CO2 purity [%] CO2 recovery - separation technology [%] CO2 recovery - overall plant [%] H2 recovery [%] CO2 capture efficiency [%] No Capture 33,3 25,2 837,3 253,1 192,6 4,5 450,2 - - 38,9 15,5 54,3 395,8 47,3 % - - - - - Absorption 38,5 25,2 968,1 287,9 167,6 5,7 461,1 16,5 18,7 51,5 16,3 103,0 358,1 37,1 % 100,0 % 94,6 % 90,6 % 100,0 % 88,1 % PSA + flash 38,5 25,2 968,2 287,1 167,4 5,4 459,9 0,0 41,3 51,6 16,7 109,6 350,2 36,2 % 98,9 % 89,8 % 86,1 % 99,6 % 81,8 % Footprint. Given the high pressure at which the syngas enters the PSA unit (38.8 bar), resulting in a relatively low volumetric flow rate, it was possible to design the PSA unit in a way that all the syngas is processed by a single PSA train. The superficial velocity adopted is able to maintain the pressure drop within acceptable limits (≈ 0.15 bar). The value was also verified not to overpass the minimum fluidization velocity at the operating conditions considered. Established the velocity and knowing the volumetric flow rate, the cross sectional area was evaluated and, hence, the diameter of the column. It resulted to be 6.6 m. Even though a PSA train is formed by 7 columns working in parallel, the footprint of the PSA unit appears to be acceptable. However, the footprint of an absorption unit would be much smaller. Table 9 compares the estimations of the two footprints, highlighting the remarks ofPDF Image | Evaluating Pressure Swing Adsorption as a CO2 separation technique in coal-fired
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