Multiple-Cycles Behavior of K2CO3/Al2O3 for CO2 Capture in a Fluidized-Bed Reactor
Multiple-Cycles Behavior of K2CO3/Al2O3 for CO2 Capture in a Fluidized-Bed Reactor
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DOI：
10.1021/ef901018f
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发表时间：
2010-01
期刊：
影响因子：
5.3
通讯作者：
Chuanwen Zhao;Xiaoping Chen;Changsui Zhao
中科院分区：
文献类型：
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作者：
Chuanwen Zhao;Xiaoping Chen;Changsui Zhao
K_2CO_3/Al_2O_3吸附剂是一种较好的燃煤电厂烟气CO_2捕集剂。在鼓泡流化床反应器中考察了K2 CO 3/Al 2 O3复合材料的CO2捕集性能和多次循环再生性能。结果表明，K_2CO_3/Al_2O_3体系在10次循环中的碳酸化转化率大于90%。K_2CO_3/Al_2O_3复合材料的显微结构稳定。10次循环后，比表面积和孔体积的变化分别为8.3 m2/g和0.036 cm 3/g，并且孔径分布几乎没有变化。仔细的温度控制很重要，因为CO2捕获的温度窗口很窄，碳酸化过程放热很高。循环10次后，洗脱率仅为2.8wt%，平均粒径减小速率为0.005mm/h。K_2CO_3/Al_2O_3吸附剂具有良好的耐磨性能。
The sorbent of K2CO3/Al2O3 is a good choice for CO2 capture from flue gas of fossil-fuel-fired power plants. The CO2-capture capacity and regeneration property for K2CO3/Al2O3 were investigated in a bubbling fluidized-bed reactor during multiple cycles. Results show that the carbonation conversion for K2CO3/Al2O3 is greater than 90% during 10 cycles. The microstructure character of K2CO3/Al2O3 is stable. The changes of surface area and pore volume are 8.3 m2/g and 0.036 cm3/g, respectively, after 10 cycles, and there is little change in the pore size distribution. Careful temperature control is important because of the narrow temperature window available for CO2 capture and the highly exothermic nature of the carbonation process. After 10 cycles, the elutriated sorbent is only 2.8 wt % and the reducing rate of average particle size is 0.005 mm/h. The sorbent of K2CO3/Al2O3 shows excellent attrition resistance performance.