Ultrafine particles (UFPs) are harmful to human beings, and their effective removal from the environment is an urgent necessity. In this study, a dielectric barrier discharge (DBD) reactor packed with porous alumina (PA) balls driven by a pulse power supply was developed to remove the UFPs (ranging from 20 to 100 nm) from the exhaust gases of kerosene combustion. Five types of DBD reactors were established to evaluate the effect of plasma catalysis on the removal efficiency of UFPs. The influences of gas flow rate, peak voltage and pulse frequency of different reactors on UFPs removal were investigated. It was found that a high total UFP removal of 91.4% can be achieved in the DBD reactor entirely packed with PA balls. The results can be attributed to the enhanced charge effect of the UFPs with PA balls in the discharge space. The UFP removals by diffusion deposition and electrostatic attraction were further calculated, indicating that particle charging is vital to achieve high removal efficiency for UFPs.

超细颗粒物（UFPs）对人体有害，有效清除环境中的超细颗粒物是当务之急。在这项研究中，开发了一种填充有由脉冲电源驱动的多孔氧化铝 (PA) 球的介质阻挡放电 (DBD) 反应器，以从煤油燃烧的废气中去除 UFP（范围为 20 到 100 nm）。建立了五种类型的 DBD 反应器来评估等离子体催化对 UFP 去除效率的影响。研究了不同反应器的气体流量、峰值电压和脉冲频率对UFPs去除的影响。发现在完全填充 PA 球的 DBD 反应器中可以实现 91.4% 的高总 UFP 去除率。结果可归因于放电空间中带有 PA 球的 UFP 增强的充电效果。