T型圆柱形微通道内CO_(2)碱液吸收数值模拟  

Numerical simulation of CO_(2) absorption by alkali liquor in T-junction cylindrical microchannels

作　　者：杨勇 祖子轩 李煜坤 王东亮 范宗良[1,2] 周怀荣 YANG Yong;ZU Zixuan;LI Yukun;WANG Dongliang;FAN Zongliang;ZHOU Huairong(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]甘肃省低碳能源化工重点实验室,甘肃兰州730050

出　　处：《化工学报》2024年第S01期135-142,共8页CIESC Journal

基　　金：国家自然科学基金项目(22268028);中央引导地方科技发展资金项目(22ZY1QA011)。

摘　　要：采用水平集两相流耦合组分传质微分方程对三维T型微通道内的CO_(2)碱液吸收过程进行了数值模拟。分析了气泡形成及流动过程、相间传递及吸收特性,并重点探讨了进口气速、液速和碱液浓度对CO_(2)化学吸收传质的影响。结果表明,在气速0.08 m/s、液速0.03 m/s时,单个气泡形成时间约为0.012 s,气泡移动速率几乎等于进口气速,展现气泡和液塞交替的泰勒流特征。CO_(2)吸收溶解速率在气泡形成初始阶段溶解速率最大,随着气液相相互接触传质推动力逐渐降低,沿出口方向的气液两相界面上逐渐下降。气速0.05 m/s增加到0.1 m/s时,CO_(2)吸收率从62.6%降低到34.8%,当液速从0.01 m/s增加到0.05 m/s时,CO_(2)吸收率从18.5%提高48.4%。吸收剂浓度从50 mol/m^(3)增加到250 mol/m^(3),吸收率由50.8%提高到79.3%。The Level-set two-phase flow coupled component mass transfer equations were used to simulate the CO_(2)absorption by alkali liquor in three-dimensional T-junction cylindrical microchannels.The bubble formation and flow process,the characteristics of interphase transfer and absorption were analyzed,and the effects of inlet gas velocity,liquid velocity and alkali concentration on the CO_(2)chemical absorption and mass transfer were mainly discussed.The results show that,for gas velocity of 0.08 m/s and the liquid velocity of 0.03 m/s,the formation time of a single bubble is about 0.012 s,and the bubble moving speed is almost equal to the inlet gas velocity,showing the alternating Taylor flow characteristics of bubbles and liquid plugs.The CO_(2) absorption rate reaches its maximum at the initial stage of bubble formation,and gradually decreases along the outlet direction along with the decrease of mass transfer force at gas-liquid interface.When the gas velocity increased from 0.05 m/s to 0.1 m/s,the CO_(2) absorptivity decreased from 62.6% to 34.8%.Conversely,when the liquid velocity increased from 0.01 m/s to 0.05 m/s,the CO_(2) absorptivity increased from 18.5%to 48.4%.Furthermore,increasing the absorbent concentration from 50 mol/m^(3) to 250 mol/m^(3) raises the absorptivity from 50.8% to 79.3%.

关 键 词：微通道 吸收 传质 二氧化碳捕集 数值模拟 

分 类 号：TQ021.1[化学工程]