CO_2微细气泡在NaOH溶液中吸收速率研究

Study on Absorption of CO_2 Bubble Disintegration in NaOH Solution

以喷气机械搅拌精炼过程为背景,研究了搅拌方式、喷气流量、搅拌转速等因素对气体吸收速率的影响,通过测定NaOH吸收CO2的速率研究气泡微细化过程,探讨了各种因素对容积传质系数和CO2利用率的影响规律.结果表明,中心搅拌情况下传质系数和气体利用率按单向、间歇和双向模式增加;容积传质系数无论在何种搅拌模式下均随着气体流量的增加而增加,但气体利用率则随着气体流量的增加而呈现先减小后增大的趋势;中心单向搅拌模式下容积传质系数和气体利用率均随着搅拌速率的增加而变小.在实验基础上,应用因次分析原理关联了容积传质系数与相关数群的准数方程,为高温实验的气泡微细化了提供科学和实验依据.

The effects of gas flow rate, rotation mode and rotation speed on absorption rate were studied by measuring absorption rate of CO2 in solution of NaOH to improve bubble disintegration of mechanical stirring injection refinement process. Volumetric mass transfer coefficient and utilization rate of CO2 in gas absorption process were measured for the optimization of experimental parameters of bubble dispersion and disintegration. The results showed that both parameters increased in the order forward rotation, forward-interrupting rotation, and forward-reverse rotation. Volumetric mass transfer coefficient increased with increasing gas flow rate in the cases of all these rotation modes. But utilization rate of CO2 decreased with increasing gas flow rate at first and then increased with increasing gas flow rate. Volumetric mass transfer coefficient and utilization rate of CO2 decreased with rotation speed under unidirectional central stirring mode. On the basis of experimental result, criterion equation on volumetric mass transfer coefficient and correlation number group was related according to dimensional analysis principle, which provided a scientific and experimental basis to high-temperature experiment of bubble dispersion and disintegration.