摘要
针对目前湿式除尘器对高浓度细颗粒物除尘效率较低、压力损失较大、喷嘴易堵塞等问题,基于多孔介质对捕集细颗粒物的增强效应,研制出一种多孔介质湿式除尘器。对该除尘器的工作原理和除尘机理进行了分析,并对该除尘器的除尘效率、排放浓度和压力损失进行了实验研究。除尘机理分析表明:该除尘器将多孔介质除尘机理和冲击水浴除尘机理相结合,增大了粉尘与液滴、液膜的接触面积,增强了粉尘与液滴、液膜的碰撞效果,在惯性碰撞、截留、扩散的共同作用下提高了对细颗粒物的除尘效率。实验研究表明:在除尘器入口粉尘浓度为2500 mg/m^(3)、多孔介质厚度为15 mm、液气比为4.69 L/m^(3)、水位高度为0的条件下,当除尘器入口风速小于14 m/s时,对中位径为2.509μm的硅微粉除尘效率高于99.48%,排放浓度低于13 mg/m^(3),压力损失小于833 Pa。
Aiming at the problems of low dust removal efficiency of high-concentration fine particles,large pressureloss,and easy clogging of nozzles by current wet dust collectors,a porous medium wet dust collector is developed based onthe enhanced effect of porous media on trapping fine particles.The working principle and dust removal mechanism of the pre-cipitator are analyzed,and the dust removal efficiency,emission conce ntration and pressure loss of the precipitator are ex-perimentally studied.The analysis of the dust removal mechanism shows that the dust remover combines the theory of porousmedia dust removal and the theory of flushing water bath dust removal,which increases the contact area between dust andliquid droplets and liquid film,and enhances the collision effect between dust and liquid droplets and liquid film,and im-prove the dust removal efficiency of fine particles under the combined effect of collision,interception and diffusion.Experi-mental research shows that:when the dust concentration at the inlet of the precipitator is 2500 mg/m^(3),the thickness of theporous medium is 15 mm,the liquid-to-air ratio is 4.69 L/m^(3),the water level is 0,and the inlet wind speed of the dust col-lector is lower than 14 m/s,the dust removal efficiency of silicon powder with a median diameter of 2.509μm is higher than99.48%,the emission concentration is lower than 13 mg/m^(3),and the pressure loss is lower than 833 Pa.
作者
朱能天
陈旺生
黄董平
范一凡
ZHU Nengtian;CHEN Wangsheng;HUANG Dongping;FAN Yifan(College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Industrial Safety Engineering Technology Research Center of Hubei Province,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2021年第10期204-208,共5页
Metal Mine
基金
湖北省中央引导地方科技发展专项(2020ZYYD019)。
关键词
多孔介质
湿式除尘器
细颗粒物
除尘效率
压力损失
porous media
wet dust collector
fine particulate matter
dust removal efficiency
pressure loss
