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化工学报  2015 

旋流气液两相强化吸收CO2的传质性能

DOI: 10.11949/j.issn.0438-1157.20141353, PP. 1012-1018

Keywords: 旋流,吸收,二氧化碳,气液两相流,传质

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Abstract:

为强化二氧化碳的吸收过程,采用一类旋流逆向气液多级接触的方式,以NaOH溶液为吸收剂,研究其与大跨度浓度CO2(2.5%~15%)接触反应的传质性能。分别探讨了吸收剂浓度、吸收剂流量、烟气CO2浓度、烟气流量及反应温度对气相总体积传质系数(Kga)的定量影响。结果表明,在实验条件下,其Kga可达(4.53×10-5)~(9.22×10-5)kmol·m-3·s-1·kPa-1。与双级直流喷雾和单级旋流喷雾相比,旋流逆向气液多级接触能够有效强化大跨度浓度CO2的吸收过程。Kga随吸收剂浓度、流量和反应温度的增加而增加,随CO2浓度增加呈现先增加后减小(CO2浓度大于5%)的非线性关系,随气体流量增加先增加后趋于稳定。

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