Continuous CO2 Capture in Dual Fluidized Beds Using Silica Supported Amine

Wenying Zhao, Zhi Zhang, Zhenshan Li, Ningsheng Cai
2013 Energy Procedia  
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 CO 2 capacity of the PEI-based sorbent was as high as 2.0 mmol· g -1 . During the adsorption and desorption of 10 times, the CO 2 capacity of the PEI-based sorbents kept stable, indicating PEI-based sorbents had excellent thermal
more » ... ty. Dual bubbling fluidized bed reactors were constructed to demonstrate the process feasibility of continuous CO 2 capture from flue gases with supported amine sorbent. Long-term stable operation and continuous solids circulation between the two reactors was achieved, and the CO 2 in the flue gases was continuously captured by the supported amine sorbent. Experimental results indicated that ~84.4% CO 2 capture 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 CO 2 capture efficiency to approximately 90.6~97%. The effect of water vapour on reaction mechanism between CO 2 and various amine groups was discussed.
doi:10.1016/j.egypro.2013.05.088 fatcat:r4eolhhxnjccjj3pctwnse6nbi