Enhancement of reactivity in surfactant-modified sorbent for CO 2 capture in pressurized carbonation
Enhancement of reactivity in surfactant-modified sorbent for CO 2 capture in pressurized carbonation
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DOI：
10.1016/j.fuproc.2010.11.002
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Huichao Chen;Changsui Zhao;L. Duan;L. Cai;D. Y. Liu;Xiaoping Chen
中科院分区：
文献类型：
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作者：
Huichao Chen;Changsui Zhao;L. Duan;L. Cai;D. Y. Liu;Xiaoping Chen
钙基（Ca-based）吸附剂的煅烧/碳酸化循环被认为是从燃烧气体中捕获二氧化碳的可行技术。最近通过添加木质素磺酸钙（CLS）并进行水合来改善钙基吸附剂的二氧化碳吸收的尝试已成功提高其有效性。 CLS/CaO的最佳质量比为0.5wt.%。颗粒尺寸和 CaO 晶粒尺寸的减小似乎是 CO2 捕获量增加的部分原因。改性吸附剂反应活性增加的主要原因是 CLS 能够延迟烧结速率，从而保留反应所需的表面积和孔体积。通过提高碳酸化压力，改性吸附剂的 CO2 吸收也得到增强。实验结果表明，改性吸附剂的最佳反应条件为0.5MPa、700℃，10个循环后转化率高达0.7，比相同条件下原始石灰石的转化率高30%。
The calcination/carbonation loop of calcium-based (Ca-based) sorbents is considered as a viable technique for CO2capture from combustion gases. Recent attempts to improve the CO2uptake of Ca-based sorbents by adding calcium lignosulfonate (CLS) with hydration have succeeded in enhancing its effectiveness. The optimum mass ratio of CLS/CaO is 0.5wt.%. The reduction in particle size and grain size of CaO appeared to be parts of the reasons for increase in CO2capture. The primary cause of increase in reactivity of the modified sorbents was the ability of the CLS to retard the sintering rate and thus to remain surface area and pore volume for reaction. The CO2uptake of the modified sorbents was also enhanced by elevating the carbonation pressure. Experimental results indicate that the optimal reaction condition of the modified sorbents is at 0.5MPa and 700°C and a high conversion of 0.7 is achieved after 10cycles, by 30% higher than that of original limestone, at the same condition.