Fundamentals of energy efficient precipitation and inactivation of COVID-19 aerosols by means of an ozone-free electrostatic precipitator designed for indoor use.

通过专为室内使用设计的无臭氧静电除尘器实现节能降水和灭活 COVID-19 气溶胶的基础知识。

• 批准号: 468800814
• 负责人: Professor Dr.-Ing. Ulrich Riebel
• 金额: --
• 依托单位: Lehrstuhl Mechanische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/468800814?language=en
• 关键词: Fundamentals; energy; efficient; precipitation; inactivation

Aerosols are seen as a decisive pathway for spreading COVID-19 and other viral or bacterial infections. The primary liquid aerosols are drying very fast in the air, forming residual aerosols in the size range from 0.1 to 100 µm. Due to the low deposition rate, aerosols below about 10 µm can accumulate in indoor air and reach critical concentrations. Meanwhile, the size range below 5 µm is suspected to be the most important for spreading infections. Electrostatic precipitators (ESPs) are ideally suited for the separation of fine aerosols in the size range from 0.1 to 100 µm. The extremely low pressure drop of ESPs (amounting to a few Pa only) allows the combination with low-noise ventilators. Low noise is an important factor for the acceptance of aerosol precipitators for indoor applications. More¬over, ESPs offer easy access for the inactivation of the precipitated aerosol by means of UV light or gas ions. A problem, however, is the formation of ozone in the corona discharges which are used, so far, as a source of gas ions for aerosol charging in all ESPs. Ozone is regarded as highly toxic in concentrations exceeding about 70 µg/m³. The present project intends to provide the basic knowledge for building a new type of ozone-free ESPs, which is well-suited for indoor use. As ozone is instable at higher temperatures, a moderate heating of the corona wire should be sufficient to suppress ozone formation. Further aspects which shall be addressed are the inactivation of virus model aerosols by UV light, interactions between ozone und UV, and the possible formation of secondary aerosols by reactions of VOCs in the active corona zone.

气溶胶被视为传播COVID-19和其他病毒或细菌感染的决定性途径。初级液体气溶胶在空气中干燥非常快，形成尺寸范围为0.1至100 µm的残留气溶胶。由于沉积率低，低于约10 µm的气溶胶可以在室内空气中积聚并达到临界浓度。与此同时，5微米以下的尺寸范围被怀疑是传播感染的最重要因素。静电除尘器（ESP）非常适合分离粒径范围为0.1至100 µm的微细气溶胶。ESP的极低压降（仅为几Pa）允许与低噪音净化器组合。低噪音是气溶胶除尘器在室内应用中被接受的一个重要因素。此外，ESP提供了通过UV光或气体离子使沉淀的气溶胶失活的容易途径。然而，一个问题是在电晕放电中形成臭氧，到目前为止，电晕放电被用作所有ESP中气溶胶充电的气体离子源。臭氧浓度超过70微克/立方米时被认为是剧毒的。本项目旨在为建造一种新型的无臭氧静电除尘器提供基础知识，这种静电除尘器非常适合于室内使用。由于臭氧在较高温度下是不稳定的，因此电晕线的适度加热应足以抑制臭氧的形成。应解决的其他方面是通过紫外线灭活病毒模型气溶胶，臭氧和紫外线之间的相互作用，以及通过活性电晕区中VOC反应可能形成的二次气溶胶。