芒刺参数对电晕放电及细颗粒物脱除特性的影响

为研究芒刺电极参数对电晕放电及颗粒物脱除特性的影响,建立静电除尘器机理实验台。在不同电压和颗粒物浓度下,分别研究了芒刺厚度δ和芒刺间距L对电晕电流及PM_2.5、PM₁₀脱除效率的影响。结果表明,薄芒刺电极的电晕放电和对各粒径段颗粒物的脱除能力高于厚芒刺电极,其中对粒径为0.2~2 μm的颗粒物的脱除效率提升明显;低电压和高颗粒物浓度时,薄芒刺电极对电晕放电和颗粒物脱除能力的提升尤为明显。随着芒刺间距的减小,电晕电流和颗粒物脱除效率均呈先增大后减小的趋势。芒刺间距为50 mm时,电极的电晕电流最大;芒刺间距为80 mm时,电极对PM_2.5、PM₁₀的脱除效率最高。研究结果为静电除尘器中芒刺电极的设计、选型提供了参考依据。

The effect of barbed electrodes parameters on the discharge characteristics and particles removal efficiency

To study the effect of design parameters on discharge characteristic and particles removal efficiency of the barbed electrodes, a test bench was built and the discharge current and PM_2.5、PM₁₀ removal efficiency of the discharge electrode with various barb thickness δ and spacing L under different applied voltage and dust concentration were studied. The results showed that the thinner barb was better at discharging and removing fine particles than the thicker one, especially for the particles in 0.2~2 μm. The effect of the thinner barb on the particles removal efficiency was dramatically obvious in the case of a lower applied voltages and higher mass concentration. The discharge current and particles removal efficiency firstly increased to the maximum and then decreased with barb spacing decreasing. The discharge current was the largest when the barb spacing was 50 mm, while the particles removal efficiency was highest when the barb spacing was 80 mm. The results could provide references for the selection and design of barbed discharge electrodes in the electrostatic precipitator.