吸附性微粒增强气液传质的一维非稳态非均相模型

One-Dimensional Instationary Heterogeneous Mass Transfer Model for Enhancement of Fine Adsorptive Particles on Gas-Liquid Mass Transfer

为研究吸附性微粒对气液传质的增强机理,基于渗透理论,考虑微粒的吸附性,建立了吸附性微粒增强气液传质模型,并通过求解模型讨论了加入吸附性微粒后液相物性的改变、微粒到气液界面的停留时间以及微粒的粒径对气液传质的影响.结果表明,离气液界面越近,粒径越小,微粒的吸附能力越大,增强因子越大;在相同的固体含率和固液分配系数下,增强因子随微粒在气液界面停留时间的增加而增加,但是当停留时间超过一定值后,随着停留时间的增加,增强因子下降.考虑表观黏度的影响,在质量固含率小于400时,随着固含率的增加,增强因子增加,当固含率再增加,则增强因子减小.研究表明,在液相中加入吸附微粒,对气液传质有明显影响.

In order to analyze the enhancement mechanism of adsorptive particles on gas-liquid mass transfer in slurry system,a one-dimensional heterogeneous mass transfer model was developed,based on the penetration theory and by considering the factors of the adsorbability.And physical properties after adding the particles, the particle residence time in the gas-liquid interface and the effect of adsorptive particles on the gas-liquid mass transfer in slurry system were described and discussed.The computational results show that the enhancement factor of gas-liquid mass transfer increases with the increase of adsorbability of particles, the enhancement factor increases with the increase of particle residence time in the gas-liquid interface zone in the beginning and then decreases with the increase of residence time,the enhancement factor decreases with the increase of particle sizes.Through considering the effect of apparent viscosity of slurry on gas-liquid mass transfer, the enhancement factor increases when solid content is less than 40_0, and then decreases with the increase of solid content.The studies show that there is an evident influence on gas-liquid mass transfer when adding fine adsorptive particles into liquid phase.