摘要
根据旋流脱水器的内部流动特性,基于欧拉-拉格朗日方法,对旋流脱水器内部气液两相流动进行了数值计算和分析,研究了液滴直径、进口质量含气率和湍流扩散效应对流场分布、脱水效率、出口质量含气率和出口液滴粒度分布的影响.结果表明:当质量流量一定时,旋流脱水器进出口压降随着进口质量含气率的增加而显著提高.对于单一直径的液滴,在不考虑湍流扩散效应的情况下,脱水效率随进口质量含气率的增加而增加.当考虑湍流扩散效应时,对于直径较小的液滴(0.1~1μm),这种规律刚好是相反的,连续相速度的增加提升了湍流扩散速度,使湍流运动更加紊乱,但脱水效率高于不考虑湍流扩散效应时的计算结果.在混合粒径条件下,随着进口质量含气率的增加,脱水效率和出口质量含气率增加,计算表明湍流扩散效应有利于混合直径液滴的分离.随着进口质量含气率的增加,液滴质量分数的峰值逐渐向小粒径方向移动,粒径分布范围逐渐减小.
According to the internal flow characteristics of cyclone dehydrator,based on the Euler-Lagrangian method,the gas-liquid two-phase flow inside the cyclone dehydrator was numerically calculated and analyzed,the effects of droplet diameter,inlet mass quality of gas and turbulent diffusion on flow field distribution,dehydration efficiency,outlet mass quality of gas and outlet particle size distribution were studied.The results showed that,when mass flow rate was constant,the inlet and outlet pressure drop of cyclone dehydrator increased significantly with the inlet mass quality of gas.For droplets of single-diameter,without considering the effect of turbulent diffusion,the dehydration efficiency increasedas the inlet mass quality of gas increased.When considered the effect of turbulent diffusion,the trend was opposite for small droplets(0.1~1μm).The increase of continuous phase velocity promoted turbulence diffusion and made turbulence more turbulent,but the dehydration efficiency was higher than that without considering the effect of turbulent diffusion.Under the condition of mixed particle size,the dehydration efficiency and outlet mass quality of gas increasedas the inlet dryness increased.The calculation showed that the effect of turbulent diffusion promoted the separation of the mixed diameter droplets.As the inlet mass quality of gas increased,the peak value of the droplet mass fraction gradually moved toward small particle size,and the particle size distribution range gradually decreased.
作者
刘哲
钱付平
张天
胡笳
夏勇军
鲁进利
LIU Zhe;QIAN Fu-ping;ZHANG Tian;HU Jia;XIA Yong-jun;LU Jin-li(School of Civil Engineering and Architecture,Anhui University of Technology,Ma’anshan 243032,China;Anhui Xinchuang Energy Saving and Environment Protection Science and Technology Corporation Limited,Ma’anshan 243071,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第11期4628-4637,共10页
China Environmental Science
基金
安徽省高校自然科学研究重大项目(KJ2017Z006)
关键词
新OG系统
旋流脱水器
气液分离
数值研究
new OG system
cyclone dehydrator
gas-liquid separation
numerical study
作者简介
刘哲(1996-),男,安徽蚌埠人,安徽工业大学硕士研究生,主要从事工业通风与空气净化方面研究;责任作者:钱付平,教授,fpingqian@163.com。
