极线结构参数对孔板式电除尘器除尘性能的影响

EFFECT OF WIRE ELECTRODE STRUCTURE PARAMETERS ON DUST REMOVAL PERFORMANCE OF PERFORATED PLATE ELECTROSTATIC PRECIPITATORS

极线结构是影响电除尘器除尘效率的重要因素。合理的极线结构能够增大空气的电离程度,提高电除尘内电场强度和空间电荷密度,使粉尘颗粒更大概率荷电到达收尘极板。通过数值模拟,研究V型芒刺线结构对孔板式电除尘器内部电场分布、流场分布和除尘效率的影响。结果表明:多孔收尘极板附近电场强度呈空间周期性波动,进入多孔板空腔后气流降低,有利于对微细颗粒物的收集。改变芒刺长度和芒刺间距会影响极板附近的电场强度、空间电荷密度和气流流速分布,但对电场均匀性影响较小。当芒刺长度为25 mm,芒刺间距为50 mm时,电除尘器对各粒径颗粒的收集效率最高,对0.1μm和1μm颗粒的收集效率分别可达到69.63%和76.84%。研究结果对实际应用的极线结构的设计具有重要指导作用。

Wire electrode structure is an important factor affecting the removal efficiency of the electrostatic precipitators.A reasonable wire electrode structure can increase the ionization degree of the air,the electric field strength and space charge density in the electrostatic precipitator,and make the dust particles more likely to be charged to the collecting plate.Numerical simulation was used to study the effect of a V-shaped barbed wire structure on the internal electric field distribution,flow field distribution,and dust removal efficiency of the perforated plate electrostatic precipitator.The study found that the electric field intensity near the perforated collecting plate fluctuated spatially and periodically,and the airflow decreased after entering the perforated plate cavity,which was conducive to collecting fine particles.Changing the barb length and barb spacing would affect the electric field strength,space charge density,and gas velocity distribution near the plate,but had little effect on uniformity of the electric field.When the barb length was 25 mm and the barb spacing was 50 mm,the electrostatic precipitator had the highest collection efficiency for particles of various sizes.The collection efficiency of particles with a value of 0.1μm and 1μm could reach 69.63%and 76.84%respectively,and the research results had important guidance for the design of polar structures in practical applications.