浆料鼓泡塔内吸附性微粒增强气液传质研究
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摘要
在气液系统中加入吸附性微粒能够强化气液传质，该浆料系统由于其对化工过程的强化作用已被广泛用于化工、石化和生化等领域中。本文就吸附性微粒对气液传质的增强作用作了实验和理论研究。
本文采用内直径为30mm，高为600mm的鼓泡塔实验装置，在接近实验物系泡点温度下，对4A分子筛/异丙醇-水和4A分子筛/叔丁醇-水浆料系统进行了气液传质实验，考察了表观气速、固含率和粒径对气液传质的影响。
考虑鼓泡塔内液相轴向返混及气液两相间的热量传递，建立了浆料鼓泡塔内气液传质和传热的数学模型，采用有限差分法、追赶法和龙格-库塔-吉尔法对模型方程进行了数值求解，对实验过程进行模拟，利用计算结果对鼓泡塔内微粒增强气液两相传质的影响进行分析。
利用实验和模型计算结果，对影响传质的因素进行分析，将液侧总体积传质系数与浆料系统表观气速、固含率、粒径、表观粘度、表面张力和表观密度以及扩散系数等参数，进行关联，利用最小二乘法得到了浆料系统一定物性范围内可以适用的关于液侧总体积传质系数的关联式。
在分析吸附性微粒对气液传质增强机理的基础上，应用渗透理论，考虑微粒的吸附性、加入微粒后液相物性的改变、微粒到气液界面的距离、在气液界面停留时间、粒径等因素建立了吸附性微粒增强气液传质的一维非稳态非均相模型，讨论了以上各因素气液传质的影响。计算结果表明：增强因子随微粒吸附容量的增大显著增加；微粒距离气液界面越远，微粒吸附能力对气液传质的增强越小；在相同粒径与微粒距离气液界面距离的条件下，增强因子随微粒在气液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；粒径增大，增强因子减小。由于浆料表观粘度的影响，在低固含率下，随着固含率的增大，增强因子增大。当在较高固含率下，随着固含率的增大，增强因子减小。
The adsorptive particles can enhance the gas-liquid mass transfer, the slurry system of adsorptive particles are widely used in petrol chemical, biochemical industries because of their intensification effect on the processes. This work studies the enhancement of adsorptive particles on the gas-liquid mass transfer.
In this paper, Experiments are performed in a bubble column of 30 mm in inner diameter and 600 mm in height at bubble point and atmospheric pressure. The slurry system used are 4A molecular sieve/isopropanol-water and 4A molecular sieve /tert-butanol-water. The experiments investigate the influence of superficial velocities, solid contents and particle sizes.
The mathematic model simultaneously considering heat and mass transfer is developed to describe the transport processes in slurry bubble column. The calculated results of model are used to analyze the influence of solid particles on gas-liquid mass transfer.
Based on the results of experiments and model calculation, an overall volumetric liquid-side mass transfer coefficient can be correlated as a function of the following eight independent variables such as superficial gas velocities, solid contents, particle sizes, apparent surface tension, apparent viscosity, apparent density and diffusivity of slurry.
In order to analyze the enhancement mechanism of adsorptive particles in slurry system, a heterogeneous, instationary one dimensional model is set up, based on the penetration theory of gas-liquid mass transfer and considered the factors of the absorbability, the physical properties after adding the particles, the distance apart from gas-liquid interface, the particle resistance time of staying in the gas-liquid interface, particle sizes, is developed to describe and discuss the effect of adsorptive particles on the gas-liquid mass transfer in slurry system. The calculated results show that the enhancement factor increases with the increase of absorbability of particles. 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. Considering the effect of apparent viscosity of slurry on gas-liquid mass transfer, the enhancement factors increases in lower solid contents and decreases with the solid
contents in higher solid contents.
本文采用内直径为30mm，高为600mm的鼓泡塔实验装置，在接近实验物系泡点温度下，对4A分子筛/异丙醇-水和4A分子筛/叔丁醇-水浆料系统进行了气液传质实验，考察了表观气速、固含率和粒径对气液传质的影响。
考虑鼓泡塔内液相轴向返混及气液两相间的热量传递，建立了浆料鼓泡塔内气液传质和传热的数学模型，采用有限差分法、追赶法和龙格-库塔-吉尔法对模型方程进行了数值求解，对实验过程进行模拟，利用计算结果对鼓泡塔内微粒增强气液两相传质的影响进行分析。
利用实验和模型计算结果，对影响传质的因素进行分析，将液侧总体积传质系数与浆料系统表观气速、固含率、粒径、表观粘度、表面张力和表观密度以及扩散系数等参数，进行关联，利用最小二乘法得到了浆料系统一定物性范围内可以适用的关于液侧总体积传质系数的关联式。
在分析吸附性微粒对气液传质增强机理的基础上，应用渗透理论，考虑微粒的吸附性、加入微粒后液相物性的改变、微粒到气液界面的距离、在气液界面停留时间、粒径等因素建立了吸附性微粒增强气液传质的一维非稳态非均相模型，讨论了以上各因素气液传质的影响。计算结果表明：增强因子随微粒吸附容量的增大显著增加；微粒距离气液界面越远，微粒吸附能力对气液传质的增强越小；在相同粒径与微粒距离气液界面距离的条件下，增强因子随微粒在气液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；粒径增大，增强因子减小。由于浆料表观粘度的影响，在低固含率下，随着固含率的增大，增强因子增大。当在较高固含率下，随着固含率的增大，增强因子减小。
The adsorptive particles can enhance the gas-liquid mass transfer, the slurry system of adsorptive particles are widely used in petrol chemical, biochemical industries because of their intensification effect on the processes. This work studies the enhancement of adsorptive particles on the gas-liquid mass transfer.
In this paper, Experiments are performed in a bubble column of 30 mm in inner diameter and 600 mm in height at bubble point and atmospheric pressure. The slurry system used are 4A molecular sieve/isopropanol-water and 4A molecular sieve /tert-butanol-water. The experiments investigate the influence of superficial velocities, solid contents and particle sizes.
The mathematic model simultaneously considering heat and mass transfer is developed to describe the transport processes in slurry bubble column. The calculated results of model are used to analyze the influence of solid particles on gas-liquid mass transfer.
Based on the results of experiments and model calculation, an overall volumetric liquid-side mass transfer coefficient can be correlated as a function of the following eight independent variables such as superficial gas velocities, solid contents, particle sizes, apparent surface tension, apparent viscosity, apparent density and diffusivity of slurry.
In order to analyze the enhancement mechanism of adsorptive particles in slurry system, a heterogeneous, instationary one dimensional model is set up, based on the penetration theory of gas-liquid mass transfer and considered the factors of the absorbability, the physical properties after adding the particles, the distance apart from gas-liquid interface, the particle resistance time of staying in the gas-liquid interface, particle sizes, is developed to describe and discuss the effect of adsorptive particles on the gas-liquid mass transfer in slurry system. The calculated results show that the enhancement factor increases with the increase of absorbability of particles. 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. Considering the effect of apparent viscosity of slurry on gas-liquid mass transfer, the enhancement factors increases in lower solid contents and decreases with the solid
contents in higher solid contents.
引文
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