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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1.5gL1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.
Pure CO2-deionized water and different concentrations of NaOH solution were used as the experimental system to study the influence of the solid particles on the mass transfer of the membrane during absorption in a plate-type membrane reactor.The effects of different particle types, stirring speed , Mass transfer system, chemical reaction strength, membrane porosity and other factors on the mass transfer enhancement.The results show that with the increase of particle solid content, the mass transfer coefficient and enhancement factor are increased, when the particles After the solid content increases to a certain range, the changes of mass transfer coefficient and enhancement factor tend to be gentle.Under the condition of constant solid content, the enhancement effect of different kinds of solid particles on the membrane absorption process increases with the increase of solid particle density The mass transfer coefficient increases with the increase of agitation speed, but the strengthening effect of solid particles decreases with high agitation speed.The mass transfer coefficient and enhancement factor of membrane absorption process increase with the increase of chemical reaction intensity. With the increase of solid content, the difference of mass transfer efficiency of different membrane porosity decreases, and the smaller the porosity, the better the enhancement effect of solid particles on absorption and mass transfer of membrane, Sub-water system, when the porosity of 20%, a solid content of the particles when 1.5gL1, solid particles can improve the mass transfer coefficient of 1.45 times, the enhancement factor of up to 2.45.