内部输水性壁面波形除雾器性能研究  

Study on wave-plate demister with internal transport wall

作　　者：彭玉凤 陈倬 朱家骅[1] PENG Yu-feng;CHEN Zhuo;ZHU Jia-hua(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《高校化学工程学报》2021年第6期979-985,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家科技支撑计划(2013BAC12B01)。

摘　　要：利用内部输水性材料作为波形除雾器壁面有利于液体传输,从而提升除雾性能。对该除雾器雾滴捕集率、液体传输速率及夹带抑制机理进行了研究,建立了预测雾滴捕集率的半经验模型和模拟计算方法,并得到实验验证,据此建立了内部输水性壁面降膜厚度与材料输水特性关联式,解释了材料内部输水性能对该除雾器的夹带抑制机理。模型计算表明,常规除雾器气速超过临界值4.82 m·s^(-1)时即会导致液膜剪切产生夹带,而内部输水性壁面除雾器接近该气速时壁面尚处于无液膜状态,气速超过临界值19.52 m·s^(-1)才开始产生液沫夹带,表明内部输水壁面能有效降低液膜厚度,且液滴在壁面完全铺展,抑制夹带发生,从而强化除雾器处理能力、提高分离效率。Wave-plate demisters made of internal transport materials can facilitate demist performance by water transportation.Droplet separation,water transportation and re-entrainment prevention mechanism were investigated by establishing corresponding models.A semi-empirical droplet separation efficiency prediction model was established and validated by experiment data,and the relationship between falling-film thickness and material properties was obtained.The re-entrainment prevention mechanism of the internal transport wall was analyzed.The results show that traditional demisters may form re-entrainment when gas velocity exceeds critical value of 4.82 m·s^(-1).However,the wave-plate demisters with internal transport wall have no liquid film under such conditions.Re-entrainment happened at gas velocity over 19.52 m·s^(-1).Droplets can be completely spread on internal transport wall,and the thickness of the liquid film can be effectively reduced to prevent re-entrainment.Therefore,demister performance can be improved.

关 键 词：输水 雾滴 除雾器 液膜 

分 类 号：TQ028.8[化学工程]