三相搅拌反应器传质特性的研究
发布时间：2018-08-28 18:56
【摘要】：气-液-固三相搅拌反应器被广泛应用于精细化工、石油化工、生物工程等领域。目前气-液-固三相搅拌反应器的传质性能研究主要集中在常温,热态条件下传质性能研究仍然十分缺乏,致使实际工况下热态搅拌反应器的设计还依赖于常温研究结果。本文主要对热态气-液-固三相搅拌反应器进行传质性能研究。本文在内径T=0.3m,液位高度H=0.54m的搅拌反应器内,采用底桨为半椭圆管盘式涡轮桨(HEDT),上层和中层桨为四宽叶翼型桨(WHu)形式的搅拌桨,针对固体体积分数Cv为0～0.12,气体流量Qg+v、为4m3/h～10m3/h,温度TK为298K～313K和转速N为8s-1～13s-1的实验条件进行了传质特性的研究。研究结果表明,临界悬浮转速Njs随着通气量以及固体体积分数的增大而增大,随着搅拌桨直径的增大而减小；通气功率准数Np,g随着固体体积分数以及温度的上升而增大；传质系数与固体体积分数呈现负相关趋势,与温度、表观气速和单位质量功呈现正相关趋势,而且在高固体体积分数、低气速和高转速时,温度对传质系数影响较为明显。基于以上的实验结果,得到了通气功率Np,g准数和kLa关于温度、表观气速、搅拌功率及固相含量的经验关联式。
[Abstract]:Gas-liquid-solid three-phase stirred reactor is widely used in fine chemical, petrochemical, bioengineering and other fields. At present, the mass transfer performance of gas-liquid-solid three-phase stirred reactor is mainly studied at room temperature, but the study of mass transfer performance under hot condition is still very lacking, so the design of hot-state stirred reactor under actual working condition still depends on the results of study at room temperature. In this paper, the mass transfer performance of hot gas-liquid-solid three-phase agitated reactor is studied. In this paper, in a stirred reactor with an inner diameter of 0.3 m and a liquid level of 0.54 m, the bottom propeller is a semi-elliptical tube-disk turbine propeller with (HEDT), upper layer and the middle propeller with four wide blade airfoil propellers in the form of (WHu). The mass transfer characteristics were studied under the experimental conditions of solid volume fraction (Cv) of 0.12, gas flow rate of Qg v, 4 m3 / h of 10 m3 / h, temperature of TK of 298K~313K and rotational speed of N as 8s-1~13s-1. The results show that the critical suspension speed (Njs) increases with the increase of aeration volume and the volume fraction of solid, and decreases with the increase of impeller diameter, and the number of aeration power Np,g increases with the increase of solid volume fraction and temperature. The mass transfer coefficient showed a negative trend with solid volume fraction, and a positive correlation with temperature, apparent gas velocity and unit mass work. Moreover, the effect of temperature on mass transfer coefficient was obvious at high solid volume fraction, low gas velocity and high rotational speed. Based on the above experimental results, the empirical correlations of Np,g number of ventilation power and kLa on temperature, apparent gas velocity, stirring power and solid content are obtained.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ027.2
本文编号：2210300
[Abstract]:Gas-liquid-solid three-phase stirred reactor is widely used in fine chemical, petrochemical, bioengineering and other fields. At present, the mass transfer performance of gas-liquid-solid three-phase stirred reactor is mainly studied at room temperature, but the study of mass transfer performance under hot condition is still very lacking, so the design of hot-state stirred reactor under actual working condition still depends on the results of study at room temperature. In this paper, the mass transfer performance of hot gas-liquid-solid three-phase agitated reactor is studied. In this paper, in a stirred reactor with an inner diameter of 0.3 m and a liquid level of 0.54 m, the bottom propeller is a semi-elliptical tube-disk turbine propeller with (HEDT), upper layer and the middle propeller with four wide blade airfoil propellers in the form of (WHu). The mass transfer characteristics were studied under the experimental conditions of solid volume fraction (Cv) of 0.12, gas flow rate of Qg v, 4 m3 / h of 10 m3 / h, temperature of TK of 298K~313K and rotational speed of N as 8s-1~13s-1. The results show that the critical suspension speed (Njs) increases with the increase of aeration volume and the volume fraction of solid, and decreases with the increase of impeller diameter, and the number of aeration power Np,g increases with the increase of solid volume fraction and temperature. The mass transfer coefficient showed a negative trend with solid volume fraction, and a positive correlation with temperature, apparent gas velocity and unit mass work. Moreover, the effect of temperature on mass transfer coefficient was obvious at high solid volume fraction, low gas velocity and high rotational speed. Based on the above experimental results, the empirical correlations of Np,g number of ventilation power and kLa on temperature, apparent gas velocity, stirring power and solid content are obtained.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ027.2
【共引文献】
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