PDF Publication Title:
Text from PDF Page: 008
149 cycle design (Yang, 1987) and is known to improve the CO2 purity. During the 150 rinse, additional H2 product is produced. After the rinse step, a number of pressure 151 equalisation steps is carried out, in which a high pressure column is connected to a 152 lower pressure column, in order to exchange gas from columns at higher pressure to 153 columns in a lower pressure part of the cycle. This serves to reduce the amount of 154 gas fed to the column for repressurisation. Additionally, the rinse gas is expanded 155 causing syngas, that would otherwise become impurities in the CO2 product, to 156 be transported to another column that can use it in the upcoming adsorption step. 157 During the depressurisation step, relatively pure CO2 product is collected. In order 158 to further desorb CO2, a low pressure purge step follows. Once sufficient CO2 159 has been recovered, the column is repressurised, first by pressure equalisation and 160 finally by repressurisation with H2 product, or alternatively with syngas. For the 161 overall SEWGS cycle, the design criteria are generally formulated in terms of the 162 carbon capture ratio, the amount of CO2 product recovered divided by the amount 163 of CO and CO2 fed, and the CO2 purity. The former quantifies the amount of 164 carbon that can be captured from the feed. The latter is important mainly because 165 any H2 and CO that end up in the CO2 product will reduce the efficiency of the 166 process. The performance of the cycle within these design criteria can be expressed 167 in three dependent variables: (1) productivity, the amount of CO2 produced per unit 168 time per amount of sorbent, (2) rinse steam consumption ( S/Crinse), the amount of 169 steam used in the rinse relative to the amount of CO and CO2 fed, and (3) purge 170 steam consumption ( S/Cpurge), the amount of steam used in the purge relative to 171 the amount of CO and CO2 fed. The optimal SEWGS cycle would consequently 172 minimize cost (CAPEX) and energy penalty (OPEX), by optimization of the total 173 steam consumption and productivity. 174 The development of a SEWGS cycle requires a prolonged endeavour, based 175 on the three fields designated above. In terms of sorbent, the cause and condi- 176 tions of detrimental MgCO3 formation (van Selow et al., 2009b; Walspurger et al., 177 2010, 2011) has been studied, and a stable successor was developed (sorbent alpha, 178 (Gazzani et al., 2013)). It has been shown that the K-HTC sorbent is sufficiently 179 catalytically active for the WGS reaction, so an additional catalyst can be omitted 180 (van Dijk et al., 2011; van Selow et al., 2013), and that the CO2-sorbent interaction 181 is not affected by H2S and other impurities (van Dijk et al., 2011; Jansen et al., 182 2013). In terms of understanding the sorption equilibrium, the role of potassium 183 sites has been elucidated (Walspurger et al., 2008). Recently, a new adsorption 184 isotherm has been presented that encompasses the SEWGS partial pressure range 185 for CO2 and H2O on K-HTC, based on preferential surface adsorption and com- 186 petitive nanopore adsorption (Boon et al., 2014). In terms of cycle design, the 187 improved performance of the H2O rinse, when compared to the CO2 rinse has 188 been addressed (van Selow et al., 2009a), and the importance of several operating 6PDF Image | High-temperature pressure swing adsorption cycle design for sorption
PDF Search Title:
High-temperature pressure swing adsorption cycle design for sorptionOriginal File Name Searched:
high-temperature-pressure-swing-adsorption.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)