Continuous CO2 Capture in Dual Fluidized Beds Using Silica Supported Amine
Continuous CO2 Capture in Dual Fluidized Beds Using Silica Supported Amine
复制标题
DOI：
10.1016/j.egypro.2013.05.088
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Wenying Zhao;Z. Zhang;Zhenshanl Li;N. Cai
中科院分区：
文献类型：
--
作者：
Wenying Zhao;Z. Zhang;Zhenshanl Li;N. Cai
本研究采用聚乙烯亚胺甲醇溶液(相对分子质量为600g·∼-1)浸渍二氧化硅颗粒(150~300um)，将胺固定在二氧化硅载体的孔道中，制得负载胺吸附剂。PEI基吸附剂的最佳CO2吸附容量为2.0 mmol.g-1。在10次吸附和脱附过程中，PEI基吸附剂的CO2容量保持稳定，说明PEI基吸附剂具有良好的热稳定性。实现了两个反应器之间的长期稳定运行和连续固体循环，并通过负载胺类吸附剂连续捕集烟气中的二氧化碳。实验结果表明，在无水条件下，∼捕集CO2的效率可达84.4%。再生温度低、吸附温度高、脱硫剂在吸收塔内停留时间短是影响脱硫剂工作能力的限制因素。水蒸气可以促进吸附过程，使CO2的捕获率提高到90.6∼97%左右。讨论了水蒸气对CO2与不同胺基反应机理的影响。
In this study, a supported amine sorbent was prepared by impregnating silica particles (150∼300 um) with methanol solution of polyethylenimine (PEI with the molecular weight of 600 g· mol-1) to immobilize amine into the pores of the silica support. The optimal CO2capacity of the PEI-based sorbent was as high as 2.0 mmol· g-1. During the adsorption and desorption of 10 times, the CO2capacity of the PEI-based sorbents kept stable, indicating PEI-based sorbents had excellent thermal stability.Dual bubbling fluidized bed reactors were constructed to demonstrate the process feasibility of continuous CO2capture from flue gases with supported amine sorbent. Long-term stable operation and continuous solids circulation between the two reactors was achieved, and the CO2in the flue gases was continuously captured by the supported amine sorbent. Experimental results indicated that ∼84.4% CO2capture efficiency could be achieved in the absence of water. The low regeneration temperature, high adsorption temperature and the short sorbent residence time in absorber were considered to be the limiting factors affecting the working capacity of sorbents. Water vapour could promote the adsorption process and increase the CO2capture efficiency to approximately 90.6∼97%. The effect of water vapour on reaction mechanism between CO2and various amine groups was discussed.