气液两相逆流-错流撞击洗涤器内两相流动与传质特性  

Flow and Mass Transfer Characteristics in a Counter-Current Crossflow Gas-Liquid Impinging Scrubber

作　　者：李光晓[1] 王钊[1] 范怡平[1] 卢春喜[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《过程工程学报》2015年第2期198-204,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:21476254)

摘　　要：针对一种能实现气液两相逆流-错流撞击的洗涤喷嘴,采用溶氧法、摄像法和电导探针法等考察了操作参数对洗涤器内两相流型、传质性能、局部气含率的影响,并分析了洗涤器内流型、气含率与传质特性的关系.结果表明,由于气液两相沿洗涤器径向分布不均,文献中通过直观观察描述流型的方法明显欠准确.在直观观察的基础上,依据局部气含率分布将两相流型分为液柱型、环流型和泡沫型三类,其中泡沫型分为环状泡沫型和碗状泡沫型两种.为了定量分析不同流型的传质效果,定义了有效传质区(气液接触、传质过程中形成的两相流中气含率75%≤εg≤85%的区域),得出了有效传质体积的计算表达式.气液逆流撞击的洗涤器内有效传质体积越大,传质效果越好.The effects of operating parameters on the flow pattern, mass transfer performance and local gas hold-up distribution are studied via the imaging method, dissolved oxygen method and double-sensor conductivity probe to reveal their relationship in a novel washing nozzle which can implement gas-liquid counter-current crossflow impingement. The results show that the flow pattern characterized only by direct observation method in some previous research can not describe it accurately because of the non-uniform gas-liquid racial distributions. Based on the imaging and local gas hold-up measurement, the flow pattern can be divided into five types： liquid column flow, annular flow and bubble flows （including the annular bubble flow and bowl-shaped bubble flow）. Moreover, a new parameter Veer （effective mass transfer zone） in which the local gas hold-up （eg） ranges from 75% to 85% is proposed. It can be used to analyze the mass transfer effect of different flow patterns quantitatively. For any counter-current crossflow gas-liquid impinging scrubber, the mass transfer efficiency increases with the proposed parameter Veer.

关 键 词：气液传质 喷嘴 气含率:洗涤器 

分 类 号：TQ027.32[化学工程] TQ051.73