CO2 uptake of modified calcium-based sorbents in a pressurized carbonation–calcination looping
CO2 uptake of modified calcium-based sorbents in a pressurized carbonation–calcination looping
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DOI：
10.1016/j.fuproc.2011.01.011
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发表时间：
2011-05
影响因子：
7.5
通讯作者：
Huichao Chen;Changsui Zhao;Minliang Chen;Yingjie Li;Xiaoping Chen
中科院分区：
文献类型：
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作者：
Huichao Chen;Changsui Zhao;Minliang Chen;Yingjie Li;Xiaoping Chen
在加压碳酸化条件下，采用醋酸盐溶液对石灰石进行改性，提高其对二氧化碳的吸收。在不同温度和压力的常压焙烧/加压碳化反应器系统中进行了多循环试验。作为对反应研究的补充，测量了孔隙结构特征（BET和BJH）。与原石灰石相比，在相同的反应条件下，改性后的吸附剂对co2的吸收率有较大的提高。在700°C和0.5MPa条件下，经过10次循环，co2吸收率最高，比0.1MPa条件下的石灰石提高了88.5%。n2吸附和SEM的结构特征证实，与改性后的吸附剂相比，石灰石的有效孔隙在烧结过程中被极大地驱去，阻碍了co2分子容易接近CaO的未反应活性位点。经过多次循环后，改性吸附剂的形态和结构性能没有明显差异。这就解释了它在加压碳化条件下具有优异的co2吸收性能。即使经过10次循环，改性吸附剂仍然达到0.88的co2吸收率。
This study focuses on enhancing CO2uptake by modifying limestone with acetate solutions under pressurized carbonation condition. The multicycle tests were carried out in an atmospheric calcination/pressurized carbonation reactor system at different temperatures and pressures. The pore structure characteristics (BET and BJH) were measured as a supplement to the reaction studies. Compared with the raw limestone, the modified sorbent showed a great improvement in CO2uptake at the same reaction condition. The highest CO2uptake was obtained at 700°C and 0.5MPa, by 88.5% increase over the limestone at 0.1MPa after 10cycles. The structure characteristics of the sorbents on N2absorption and SEM confirm that compared with the modified sorbent, the effective pores of limestone are greatly driven off by sintering, which hinders the easy access of CO2molecules to the unreacted-active sites of CaO. The morphological and structural properties of the modified sorbent did not reveal significant differences after multiple cycles. This would explain its superior performance of CO2uptake under pressurized carbonation. Even after 10cycles, the modified sorbent still achieved a CO2uptake of 0.88.