气液反应体系相界面传质强化研究

发布时间：2018-01-13 02:14

  本文关键词：气液反应体系相界面传质强化研究　出处：《化学工程》2016年03期 　论文类型：期刊论文

  更多相关文章： 多相反应体系 界面传质 过程强化

【摘要】：气液反应界面传质的强化是当今高效和节能反应器研究的重要课题,弄清反应器内的气液传质机理是对气液反应器进行数学描述的关键。反应过程的能效和物效与体系中的传质系数k_G,k_L,k_S以及相界面面积a等参数直接相关,这些参数受气泡尺寸、分布、表观气速和气含率等因素的制约。就确定的体系和反应条件而言,这些因素会因反应器的结构尤其是搅拌和混合方式的变化而异。文章从理论上分析了影响气液界面传质的各因素,建立了较为详细的理论模型。理论计算结果表明:气泡大小是影响气液界面传质和最终反应速率的重要流体力学参数,微米级气泡对反应过程的强化作用明显。能量耗散率是决定体系气泡大小的深层原因,强化气液反应器设计时应重点考虑。
[Abstract]:The enhancement of gas-liquid reaction interface mass transfer is an important subject in the research of high efficiency and energy saving reactors. Understanding the gas-liquid mass transfer mechanism in the reactor is the key to the mathematical description of the gas-liquid reactor. The energy efficiency and material efficiency of the reaction process and the mass transfer coefficient KGG / KL in the system are discussed. The parameters KS and interface area a are directly related, and these parameters are restricted by the bubble size, distribution, apparent gas velocity and gas holdup, etc. In terms of the determined system and reaction conditions. These factors will vary depending on the structure of the reactor, especially the mixing and mixing modes. In this paper, the factors affecting the mass transfer at the gas-liquid interface are analyzed theoretically. A detailed theoretical model is established. The theoretical calculation results show that the bubble size is an important hydrodynamic parameter affecting the mass transfer and the final reaction rate of the gas-liquid interface. The energy dissipation rate is the deep reason that determines the bubble size of the system, which should be considered in the design of the enhanced gas-liquid reactor.
【作者单位】： 南京大学化学化工学院;南京大学医学院附属鼓楼医院;
【基金】：国家自然科学基金资助项目(21306078;21476105;91434101)
【分类号】：TQ021.4
【正文快照】： 气液固多相反应体系在化工、食品、制药、能源、环保等过程工业中应用极其广泛。但无论是传质分离过程还是化学反应过程,多相流体间的相界面积都是影响甚至决定过程效率的重要参数。总体而言,相界面积既与反应的调控参数,即与反应器的结构(搅拌方式等)和操作条件(温度、压力、，

本文编号：1416995