New CO2 Capture Process with Gas-Liquid-Solid Three-Phase Circulating Fluidized Bed

被引:3
|
作者
Hu, Kangtao [1 ]
Liu, Jinghao [1 ]
Yang, Hairui [1 ]
Zhang, Hai [1 ]
Liu, Qing [1 ]
机构
[1] Tsinghua Univ, Dept Thermal Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China
关键词
CARBON-DIOXIDE; MASS-TRANSFER; ABSORPTION;
D O I
10.1021/ie401424c
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The idea of applying the gas-liquid-solid (GLS) three-phase circulating fluidized bed to CO2 capture by aqueous ammonia is proposed in this work. A three-phase circulating fluidized bed test rig was built, and a series of experiments were carried out to study the multiphase flow and gas-liquid mass transfer behavior. Compared with the conventional reactors, the solids in the three-phase circulating fluidized bed can break up bubbles into much smaller ones and distribute them more uniformly. The experimental results show a three-phase circulating fluidized bed can provide larger interface area, longer residence time, and higher mass transfer efficiency. Based on these results, the process for CO2 capture by aqueous ammonia using a three-phase circulating fluidized bed was designed conceptually and its feasibility was studied preliminarily by Apsen Plus-a simulation software. When the mole fraction of aqueous ammonia is about 5.16% in the three-phase circulating fluidized bed, more than 90% of the CO2 can be absorbed and the ammonia escaping ratio is very small. The three-phase circulating fluidized bed presents great potential in CO2 separation by aqueous ammonia.
引用
收藏
页码:15905 / 15911
页数:7
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