Kang Myung Soo, Yu Gihyeon, Shin Jaeuk, Hwang Jungho
Department of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea.
J Hazard Mater. 2021 Jun 5;411:125038. doi: 10.1016/j.jhazmat.2021.125038. Epub 2021 Jan 4.
Oil mist emitted during cooking is one of the major sources of atmospheric particulate matter in urban areas. A conventional electrostatic precipitator (ESP) is used in some large restaurants; it requires regular electrode cleaning to maintain particle collection performance. However, oil mist generated during cooking is viscous and difficult to clean with water. Herein, we introduce a methodology and a device for cleaning collected oil mist using surface dielectric barrier discharge (surface-DBD) plasma. Our device uses corona discharge for the collection of oil mist. Subsequently, the oil mist collected is decomposed to gas-phase species by surface-DBD plasma. A maximum collection efficiency of 93.25% (for 230 nm di-ethyl hexyl sebacate (DEHS) particle) is obtained at a flow velocity of 1.5 m/s. The maximum oil mist decomposition efficiency is 96.4%. More than 80% of the decomposed oil mist is converted to CO and CO under all test conditions. Some of the byproducts other than CO and CO are released as particles. Higher frequency results in higher oil mist decomposition efficiency, but also higher byproduct formation of particles. The mechanism of oil mist decomposition by surface-DBD plasma is discussed using optical emission spectroscopy data.
烹饪过程中排放的油雾是城市地区大气颗粒物的主要来源之一。一些大型餐厅使用传统的静电除尘器（ESP），它需要定期清洁电极以保持颗粒收集性能。然而，烹饪过程中产生的油雾具有粘性，难以用水清洁。在此，我们介绍一种使用表面介质阻挡放电（surface-DBD）等离子体清洁收集到的油雾的方法和装置。我们的装置使用电晕放电来收集油雾。随后，收集到的油雾通过表面-DBD等离子体分解为气相物质。在流速为1.5 m/s时，最大收集效率为93.25%（对于230 nm癸二酸二乙酯（DEHS）颗粒）。最大油雾分解效率为96.4%。在所有测试条件下，超过80%的分解油雾转化为CO和CO。除CO和CO之外的一些副产物以颗粒形式释放。较高的频率会导致较高的油雾分解效率，但也会导致较高的颗粒副产物形成。利用光发射光谱数据讨论了表面-DBD等离子体分解油雾的机理。
