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

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