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