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板式电滤装备内部多场耦合特性研究

作者:优质期刊论文发表网  来源:www.yzqkw.com  发布时间:2019/10/31 9:30:00  

摘要:为了提高板式电滤装备脱除烟气中颗粒物的性能,找出装备高效率净化颗粒物的方法。本文采用数值模拟与实验相结合的方法,对装备内部多场耦合特性,以及气流流速、放电电压、颗粒大小对除尘效率的影响进行了研究,主要研究内容和结论如下:

(1)内部电场数值计算研究:计算放电极周围的电场分布,探究放电极直径、离子迁移率对电场强度与空间电荷密度的影响。研究发现:装备内部的各项电场特性的峰值都聚集在放电极周围,随着到放电极距离的增大,其电场强度、电荷密度、电流密度均减小;放电极半径与离子迁移率的增大,会使得装备内部电场强度与电荷密度减小。

(2)各场之间的相互影响:利用CFD软件对装备内部多场耦合以及放电电压、气流流速、颗粒粒径对除尘效率的影响进行数值模拟。研究表明:电场对气流场的影响表现在EHD流,EHD流的主要的形态结构是旋涡,其影响主要是针对粒径小于6μm的颗粒物,随着颗粒粒径的增大和气流流速的增大EHD流对除尘效率的影响越来越小;电场对颗粒场的作用主要体现在体积力,气流场对颗粒场的影响主要表现在影响荷电时间和改变空气曳力。

(3)操作参数对除尘效率的影响:随着空气流速的增大,除尘效率有所减小,当放电电压为50kV,颗粒粒径为2μm,气流流速由0.5m/s增加到2.5m/s时,除尘效率由60%减小至22%;颗粒直径越大,除尘效率越高,当放电电压为40kV,气流流速为0.5m/s,颗粒粒径由2μm增加到10μm时,除尘效率由32%增加至90%;放电电压越高,除尘效率越高,当颗粒粒径为2μm,空气流速为1m/s,放电电压由30kV增加至60kV时,除尘效率由15%增加至70%。通过正交实验研究各因素对除尘效率的影响大小依次为:放电电压、颗粒粒径、气流流速。

(4)多场耦合特性的实验研究:搭建实验平台,研究气流场对电场的影响规律,得出了不同放电电压下极板处的电场分布规律,利用实验的方法探究各参数对装置除尘效率的影响,将实验结果与数值模拟结果进行了对比,两者者吻合性较高。

In order to improve the plate electrostaticprecipitator’s performance of removing fine particles, find out the best methodabout the device efficiently purifies fine particles, this paper uses a methodwhich combination of numerical simulation and experimentation, study themulti-field coupling characteristics, and the influence of airflow velocity,discharge voltage, and particle size on dust removal efficiency on the plateelectrostatic precipitator. The main research contents and conclusions are asfollows:

(1) The study of numerical calculation inthe electric field: calculate the electric field distribution around thedischarge electrode. Explore the effect of discharge electrode diameter, ionmobility on electric field strength and space charge density. The results showthat the peaks of the electric field characteristics inside the device are allgathered around the discharge electrode, follow the distance from the dischargeelectrode increases, the electric field intensity, charge density, and currentdensity rapidly decrease, the increase of the radius of the discharge electrodeand the ion mobility will reduce the internal electric field intensity andcharge density of the device.

(2) The Study of mutual influence in thedevice: simulate the effects of multi-field coupling inside the device and theinfluence of the discharge voltage, airflow velocity, and particle size fordust removal efficiency with CFD software. The results show that the electricfield change the airflow field by EHD flow ,The mainmorphological structure of EHD flow is vortices which mainly effect is onparticles smaller than 6μm, With the increase of particle size and airflowvelocity, EHD flow has less and less influence on dust removal efficiency, theeffect of the electric field on the particle field is mainly reflected in thevolume force, the influence of the airflow field on the particle field ismainly reflected in the influence of the charging time and the change of theair drag force.

(3) The study of the relationship betweenoperating parameters and dust removal efficiency: the increase of the airflowvelocity will reduce the dust removal efficiency,whenthe discharge voltage is 50kV,the particle size is 2μm,and the airflow velocity increases from 0.5m/s to 2.5m/s,the dust removal efficiency is reduced from 60% to 22%,the increase of the particle size will increase the efficiency ofdust removal,when the discharge voltage is 40kV,the airflow velocity is 0.5m/s,and theparticle size increases from 2μm to 10μm,the dustremoval efficiency increases from 32% to 90%,theincrease of the discharge voltage will increase the efficiency of dust removal,When the particle size is 2 μm, the air velocity is 1 m/s,and the discharge voltage increases from 30 kV to 60 kV,the dust removal efficiency increases from 15% to 70%. The effectsof various factors on dust removal efficiency were studied by orthogonalexperiments: discharge voltage, particle size, and airflow velocity.

(4) Experimental study of multi-fieldcoupling characteristics: built the experimental platform about the plateelectrostatic precipitator, study the influence of airflow field on theelectric field, detect the distribution of electric field at the plateelectrostatic precipitator under different discharge voltages, explore theinfluence of various parameters on the dust removal efficiency of the device,the experimental results are compared with the numerical simulationresults to verify the reliability of the model.

关键词:板式电滤装备;多场耦合;EHD流;颗粒运动轨迹;除尘效率

Plate type electrostatic precipitator;Coupling multi-fied; EHD flow; Particle trajectory; Dust removal efficiency

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