固体粒子对板式膜吸收过程的传质强化

分别采用纯CO2-去离子水和不同浓度的NaOH溶液为实验体系，在板式膜器中研究了第三相固体粒子对膜吸收过程传质效果的影响．分别考察了在不同粒子种类、搅拌转速、传质体系、化学反应强度、膜孔隙率等因素下固体粒子对传质强化的影响．结果表明，随着粒子固含率的增大，传质系数和增强因子均有所提高，当粒子固含率增大到一定范围后，传质系数和增强因子的变化趋于平缓．在固含率一定的条件下，不同种类的固体粒子对膜吸收过程的强化效果随着固体粒子密度的增加而减小．传质系数随着搅拌转速的增大而增大，但高搅拌转速下固体粒子的强化作用减弱．膜吸收过程的传质系数和增强因子随着化学反应强度的增强而增加．随着粒子固含率的增大，不同膜孔隙率对传质效果的差异减小，且孔隙率越小，固体粒子对膜吸收传质过程的强化效果越好．其中，对于纯CO2-去离子水体系，当孔隙率为20％，粒子固含率为1．5gL^（-1）时，固体粒子的加入可使传质系数提高1．45倍，增强因子可达2．45．

Intensification of introducing the solid particles on membrane absorption mass transfer process

Pure CO2 was absorbed by de-ionized water and different concentrations of NaOH solution in membrane absorption process. The effect of introducing of the solid particles on mass transfer behavior in membrane absorption process was studied. Some influencing factors, such as, the species of particle, the stirrer speed, the experiment system, the strength of reaction, and also the membrane porosity on the mass transfer performance were studied. Results showed that, the mass transfer coefficient and the enhancement factor increases as solid particles concentration increasing. At a certain solid concentration, the enhancement effect of solid-phase particles decrease with the particles density increasing. The mass transfer coefficient increases as the stirrer speed increases. With the increasing of pH, the mass transfer coefficient and the enhancement factor increase. The mass transfer coefficient declined with the increasing of solid particles concentration at different membrane porosities, and the enhancement effect of particles increase with the decreasing of membrane porosity. To the porosity of 20%, when the solid particles concentration was 1.5 g L^（-1）, the mass transfer coefficient can be increased by 1.45 times, and the enhancement factor will be up to 2.45.