THE REACTIVITY OF NANOSCALE CALCIUM OXIDE PARTICLES IN CALCINATION AND CARBONATION CYCLE
Calcium oxide has been identified to be the best media for CO2 capture in zero-emission power generation systems, both technically and economically. However its carbonation conversion decreases with carbonation/calcination cycles, reducing its attractiveness in carbonation cycles. To overcome this obstacle, an experimental investigation has been carried out in this paper, focusing on the conversion of nanosize particles of CaO. Two types of nanosize CaO absorbent samples, fabricated by a wet impregnation method with the support of gamma-Alumina in laboratory and commercially supplied, were tested using a thermogravimetric analyzer (TGA). We found that the conversion of CaO and its reactivity with CO2 are improved by reducing the CaO particle sizes to nanosize compared to larger particles. The initial conversions are both high, but the reversibility of commercial nanosize CaO without any supporting base still decreases with cycles while the reversibility of CaO particles deposited on porous gamma-Alumina does not decrease after 5 cycles. The decrease in conversion was attributed to the sintering of CaCO3 particles.
CO2 capture nanosize CaO gamma-alumina support
Wenqiang LIU Bo FENG Joe DINIZ DA COSTA Geoff GX WANG
Division of Mechanical Engineering, School of Engineering, The University of Queensland, Brisbane, A Division of Chemical Engineering, School of Engineering, The University of Queensland, Brisbane, Aus
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
763-766
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）