CO2 CAPTURE USING DRY POTASSIUM-BASED SORBENTS IN A BUBBLING FLUIDIZED-BED REACTOR

摘要：

A bubbling fluidized-bed reactor was used to study the CO2 capture characteristics of dry potassium-based sorbents. Potassium-based sorbents were prepared by impregnation with potassium carbonate on supports such as cocoanut activated charcoal (AC＃1), coal active carbon (AC＃2), activated alumina (Al2O3), silica gel (SG) and diatomite. Sorbents such as K2CO3/AC＃1, K2CO3/AC＃2, and K2CO3/Al2O3 showed excellent carbonation capacity, the conversion rates of those sorbents were 92.5％, 85.1％, and 88.2％, respectively. The regeneration rates of those sorbents were 87.1％, 83.9％ and 86.7％, respectively. SEM and N2 adsorption tests showed that the surface area and pore volume of those sorbents were 669 m2 g-1, 390 m2 g-1, 139 m2/g, and 0.08 cm3/g, 0.17 cm3/g, 0.34 cm3/g, respectively. The particle morphologies of those sorbents are propitious to the carbonation reaction. However, K2CO3/diatomite and K2CO3/SG showed poor carbonation capacity, the conversion conversions were only 2.0％ and 1.9％, respectively. The surface area and pore volume of two sorbents were 1.1 m2/g, 39 m2/g and 0.004 cm3/g, 0.33 cm3/g, respectively. The carbonation capacity is affected by the particle morphology of those sorbents. The present work has provided data base for designing and operating a large scale CO2 capture process with two fluidized-bed reactors.

关键词： CO2 capture potassium-based sorbent carbonation fluidized-bed reactor

作者: C.W.Zhao X.P.Chen C.S.Zhao

作者单位: School of Energy & Environment, Southeast University, Nanjing, 210096, China

会议类型: 国际会议

会议名称: 第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)

会议地点: 西安

会议语种:英文

页码: 562-568

在线出版日期: 2009-05-18（万方平台首次上网日期，不代表论文的发表时间）