密封式错流旋转填料床气膜控制传质过程研究

在密封式错流旋转填料床中,利用浓度为0.926 mol/L的NaOH溶液吸收空气中体积分数为0.5%—1%的CO2气体,对气膜控制过程传质性能进行了研究。实验表明:密封式错流旋转填料床CO2的吸收率随气体流量的增大而减小,在低转速下随旋转填料床的转速增大气体吸收率上升较快,高转速时影响变小;转速大于1 000 r/min情况下,CO2的吸收率随液量的增大而上升,转速小于1 000 r/min情况下,CO2的吸收率随液量增大而变小。建立了密封式错流旋转填料床气膜控制过程的气体吸收模型,经验证实验结果与模型计算结果吻合较好。

Study on the process of gas-film controlled mass transfer in sealed cross-flow rotating packed bed

The gas-film controlled mass transfer characteristic was investigated in sealed cross-flow rotating packed bed(RPB),where the CO2 in the air(φ=0.5%-1%) was absorbed by NaOH solution [c(NaOH)=0.926 mol/L].The experimental data shows that the CO2 removal efficiency decreases with increasing of gas flux;it increases with the increase of liquid flux under the condition of rotating speed higher than 1000 r/min;however,it decreases with the increase of liquid flux under the condition of rotating speed less than 1000 r/min.A mathematical model was developed for gas-film controlled mass transfer in sealed cross-flow RPB.The calculation values from mathematical model accord with the experimental values well.