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。主要的液体气溶胶在空气中非常快地干燥，形成尺寸的残留气溶胶范围为0.1至100 µm。由于沉积速率较低，低于10 µm的气溶胶可以在室内空气中积聚并达到临界浓度。平均值，怀疑低于5 µm的尺寸范围对于传播感染最重要。静电排气器（ESP）非常适合于在0.1至100 µm范围内的细气溶胶分离。 ESP的极低压力下降（仅大于几个PA）允许与低噪声呼吸机的组合。低噪声是接受室内应用中气溶胶排气器的重要因素。不胜推动，ESP可以轻松地通过紫外线或气体离子灭活珍贵的气雾剂。但是，一个问题是，到目前为止，使用的电晕放电中的臭氧形成，作为所有ESP中气溶胶充电的气体离子来源。臭氧被认为是浓度高约70 µg/m³的剧毒。本项目旨在为建立一种新型的无臭氧ESP提供基本知识，该知识非常适合室内使用。由于臭氧在较高的温度下是不稳定的，因此电晕线的适度加热应足以抑制臭氧形成。应解决的另一个方面是通过紫外线，臭氧UND紫外线之间的相互作用以及通过活性电晕区中VOC的反应来形成二次气溶胶的可能形成病毒模型气溶胶。