摘要
为提高某600 m2烧结机头电除尘器的实际工程应用效果,使用商业CFD软件进行数值模拟,分别采用k-ε模型、电磁流体模型(MHD)和离散相模型(DPM)模拟流场、电场和颗粒运动轨迹。结果表明:经气流分布优化后,计算得到电除尘器进口烟气量分配偏差为±1.5%、颗粒相质量流量偏差为±0.7%,电除尘器本体两侧阻力分别为127.1 Pa和123.7 Pa,电场截面气流分布均匀性相对均方根差分别为0.129和0.133,均优于标准JB/T7671-2017要求;得到电场内电势分布及颗粒运动规律,电除尘效率与供电电压、颗粒粒径具有相关性。经现场实测验证,各参数的实测值与模拟值一致性较好,实测电除尘器出口烟尘浓度为25.8 mg·m-3,除尘效率达99.20%,优于设计值;烟尘颗粒在0.03~10μm的分级除尘效率为80.35%~98.69%。0.1~1μm的颗粒段存在穿透窗口,其分级除尘效率仅为80.35%~91.81%。本研究结果可为烧结烟气的烟尘超低排放提供参考。
In order to guide the practical engineering design of a 600 m2 sintering head electrostatic precipitator(ESP),numerical simulation was performed by a commercial CFD software.The flow field,electric field and particle trajectory were simulated by using the k-εmodel,the electromagnetic fluid model(MHD)and the discrete phase model(DPM),respectively.The results showed that after air distribution optimization,the deviations of smoke gas distribution and particle mass flow rate of ESP inlet were±1.5%and±0.7%,respectively.The ESP resistances on both sides were 127.1 Pa and 123.7 Pa,respectively,and the root mean square deviations of electric field section airflow distribution uniformity were 0.129 and 0.133,respectively,which were superior to the standard JB/T 7671-2017 requirements.The electric potential distribution and particle movement law in the electric field were obtained,and the dust removal efficiency was positively correlated with the power supply voltage and particle size.Through verification by field measurement,the measured values were in good agreement with the simulated ones,and the measured value of dust concentration in ESP outlet was 25.8 mg·m-3,the dust removal efficiency reached 99.20%,which were better than the designed values.The dust removal efficiencies of dust particles within the range of 0.03~10μm were80.35%~98.69%,of which the particles within the range of 0.1~1μm had penetration window,and their dust removal efficiency were only 80.35%~91.81%.This study can provide reference for the ultra-low emission of sintering smoke.
作者
张作状
ZHANG Zuozhuang(School of Mechanical and Electrical Engineering,Rizhao Polytechnic,Rizhao 276826,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2019年第10期2502-2510,共9页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划(2017YFC0210302)
山东省科技发展计划资助项目(2013GGX10404)
关键词
烧结机头电除尘器
CFD软件
气流分布
数值模拟
sintering head electrostatic precipitator
CFD software
air distribution
numerical simulation
