Abstract: With the largescale intensive pig breeding industry, the demand for the removal of fine particulate pollutants (PM2.5) in piggery based on electrostatic precipitation technology brought a great challenge to improve the air quality of piggery. For improving the collection efficiency η of a wireplate electrostatic precipitator (EP) in the piggery, open source software (MATLAB) & Finite element method (FEM) was applied to calculate RNG k-ε equations, corona model (CM) and particle tracking model (PTM), and to analyze electric field, flow field and particle trajectory in the wireplate EP. Through deep insight into the particle transport behaviors in a wireplate EP, the results showed that the predicted values of potential, flow field and capture efficiency were in good agreement with the experimental data. In the wireplate EP, the potential and charge density were symmetrically distributed with the corona wires as the center. Moreover, η with the increase of particle diameter dp, it first decreased, then remained unchanged, and then increased until constant in the range of 0.01-10 μm; Simultaneously, η of PM2.5 increased with the decrease of flow velocity u and with the increase of corona wires voltage V. In addition, the experimental and calculation results showed that η (dp=2.0 μm) was 100% at u=1 m/s, V=50 kV. Therefore, this numerical method and law of fine particle transport behavior provides a scientific control method for the construction of green and efficient removal technology of particulate pollutants in the piggery.

Key words: air quality of the piggery, fine particles, electrostatic precipitators, airflow velocity, collection efficiency, voltage

摘要： 为提高猪舍内静电除尘器（EP）的细颗粒污染物的捕集效率，采用k-ε湍流模型、电晕模型（CM）、颗粒追踪模型（PTM），研究细颗粒在EP内的输运行为，分析猪舍线板型EP内电场、流场和细颗粒运动的特性。计算结果表明，电势、流场和捕集效率η的预测值与试验数据符合良好；在线板型EP内，电势和电荷密度以电晕线为中心呈对称分布；0.01~10 μm粒径内，η随粒径dp的增大，先减小，再保持不变，再增大，直至恒定不变。试验与计算结果表明，PM2.5颗粒的η随流速u减小而增大，随电晕线电压V增大而增大；当u=1 m/s，V=50 kV时，η(dp=2.0 μm)可达100%。该细颗粒输运模型能有效预测细颗粒运动和捕集行为，为猪舍静电除尘器的优化设计提供科学方法。

关键词: 猪舍空气质量, 细颗粒, 静电除尘器, 流速, 捕集效率, 电压