T型圆柱形微通道内CO2碱液吸收数值模拟

doi:10.11949/0438-1157.20240380

摘要/Abstract

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CO₂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CO₂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。CO₂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，CO₂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，CO₂吸收率从18.5%提高48.4%。吸收剂浓度从50 mol/m³增加到250 mol/m³，吸收率由50.8%提高到79.3%。

关键词: 微通道, 吸收, 传质, 二氧化碳捕集, 数值模拟

Abstract:

The Level-set two-phase flow coupled component mass transfer equations were used to simulate the CO₂ 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 CO₂ 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 CO₂ 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 CO₂ 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 CO₂ absorptivity increased from 18.5% to 48.4%. Furthermore, increasing the absorbent concentration from 50 mol/m³ to 250 mol/m³ raises the absorptivity from 50.8% to 79.3%.

Key words: microchannel, absorption, mass transfer, CO₂ capture, numerical simulation

中图分类号:

TQ 021.1

杨勇, 祖子轩, 李煜坤, 王东亮, 范宗良, 周怀荣. T型圆柱形微通道内CO₂碱液吸收数值模拟[J]. 化工学报, 2024, 75(S1): 135-142.

Yong YANG, Zixuan ZU, Yukun LI, Dongliang WANG, Zongliang FAN, Huairong ZHOU. Numerical simulation of CO₂ absorption by alkali liquor in T-junction cylindrical microchannels[J]. CIESC Journal, 2024, 75(S1): 135-142.

图/表 10

图1 T型微通道及网格分布

Fig.1 Geometry and mesh distribution for T-shaped microchannel

图2 微通道内气速0.08 m/s、液速0.03 m/s时的气泡形成和流速流线分布

Fig.2 Bubble formation, velocity profile and stream line in microchannel at Ug=0.08 m/s and Ul =0.03 m/s

图3 微通道内气速0.08 m/s、液速0.03 m/s时CO2吸收速率和气相CO2浓度分布的演变

Fig.3 Evolution of CO2 absorption rate and gas CO2 concentration in microchannel at Ug=0.08 m/s and Ul =0.03 m/s

图4 不同气速下气相体积分数分布

Fig.4 Gas volume fraction at different gas inlet velocities

图5 不同气速下气相CO2浓度分布

Fig.5 Gas CO2 concentration at different gas inlet velocities

图6 气速对CO2吸收率和出口浓度的影响

Fig.6 Effect of gas velocity on CO2 absorptivity and outlet concentration

图7 不同液速下气相体积分数

Fig.7 Vapor phase volume fraction at different liquid velocities

图8 不同液速下CO2吸收效果

Fig.8 CO2 absorption effect at different liquid speeds

图9 液速对CO2吸收率和出口浓度的影响

Fig.9 Effect of liquid velocity on CO2 absorption rate and outlet concentration

图10 浓度对CO2吸收率和出口浓度的影响

Fig.10 Effect of concentration on CO2 absorption rate and outlet concentration

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T型圆柱形微通道内CO₂碱液吸收数值模拟

Numerical simulation of CO₂ absorption by alkali liquor in T-junction cylindrical microchannels

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