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465 The trends in Figure 12 clearly show that the carbon capture ratio is mainly 466 determined by the S/Cpurge: an increase in S/Cpurge leads to an increase in car- 467 bon capture ratio. This is caused by the fact that the purge flow rate determines 468 the extent to which the column is cleaned during the purge step and consequently 469 the amount of CO2 captured in the subsequent adsorption step. Indeed, the same 470 trend has been reported earlier by Reijers et al. (2011) and Jansen et al. (2013). 471 There is a slight opposite trend with S/Crinse, an increase of which causes the car- 472 bon capture ratio to decrease slightly. This also corresponds to the trends reported 473 by Reijers et al. (2011). By feeding more rinse gas to the column, the chance in- 474 creases of CO2 being carried over during pressure equalisation to the top of the 475 receiving column (see Figure 1). It will then end up in the H2 product, effectively 476 lowering the carbon capture ratio. Figure 12b shows that the CO2 purity is deter- 477 mined by S/Crinse, in line with Reijers et al. (2011) and Jansen et al. (2013). An 478 increase in S/Crinse causes more syngas to be removed from the column during 479 the rinse and the pressure equalisation steps and consequently increases the CO2 480 purity. Conversely, decreasing or even omitting rinse will decrease the CO2 purity. 481 An increase in S/Cpurge, on the other hand, leads to a slight decrease in CO2 pu- 482 rity, similar to the trend reported by Reijers et al. (2011). In contrast, Jansen et al. 483 (2013) have observed an increase in CO2 purity with S/Cpurge. The difference 484 might be caused by the kinetics of desorption. All else being equal, and provided 485 desorption kinetics is sufficiently fast, an increase in S/Cpurge will lead to a CO2 486 leaner sorbent at the start of the adsorption step. With a leaner sorbent, and given 487 the amount of syngas fed in the adsorption step, the CO2 front will progress much 488 less far into the column. Consequently, the column will contain more H2 product 489 gas at the end of the adsorption step and the start of the rinse, resulting in a lower 490 CO2 purity. In contrast, if desorption kinetics is slower, the qCO2 profile in the 491 column will be more homogeneous (flat) throughout the column at the start of the 492 adsorption step (compared to the current process, see Figures 5k and 5b). The ad- 493 sorption step will then have a less steep front and syngas will be present in a larger 494 part of the column at the start of the rinse, already decreasing the CO2 purity. In 495 such a case, using more purge gas will improve the extent to which the column 496 is regenerated near the H2 product side of the column. This then causes a better 497 separation during the adsorption, rinse, and pressure equalisation steps. The CO2 498 purity is then improved by increasing S/Cpurge. Figure 12 shows that purge as well 499 as rinse are required to achieve the targets for carbon capture ratio and CO2 purity. 500 In conclusion, the amount of rinse steam effectively determines the CO2 purity and 501 and the amount of purge steam effectively determines the carbon capture ratio, they 502 are determined independently by the targets of 99% CO2 purity and 95% carbon 503 capture ratio. 504 Figure 13 shows the response of the SEWGS cycle to variations in the total cy- 24PDF Image | High-temperature pressure swing adsorption cycle design for sorption
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