热耦合电晕放电空气消毒装置的设计及特性分析

Design and Feature Analysis of a Thermally Coupled Corona Discharge Air Disinfection Device

由新冠病毒引起的新冠肺炎疫情仍在全球蔓延,阻断其气溶胶传播对控制疫情具有重要意义。传统等离子空气消毒装置具有动态和快速的优点,但消毒效果受到单一手段限制,维护过程存在二次感染风险。为此,根据新冠病毒的生理特性,改进传统等离子空气消毒技术,设计了基于热耦合电晕放电技术的空气消毒装置。采用阵列线–板电极结构实现电晕放电,采用极板内嵌发热丝实现集中加热。对放电参数进行测量,发现在高至5.6 W的放电功率下可以稳定运行,放电规律服从汤森关系。对热参数测量和仿真表明,集中加热相比空气整体加热,加热效率提高17倍,同时对环境温度影响极小。使用解淀粉芽孢杆菌和枯草杆菌噬菌体作为模型病菌对消毒性能进行验证,结果表明热耦合电晕放电能有效提高病菌杀灭效果,极板残留病毒去除率提升99.97%,从而降低二次感染风险。该研究为气溶胶传播的新冠病毒杀灭提供装置基础,为阻断其气溶胶传播途径提供技术参考。

The COVID-19 caused by the novel coronavirus is still spreading globally,and blocking its airborne transmission route is of great significance to control the pandemic.The conventional plasma air disinfection devices show advantages in their dynamic and rapid capabilities,but the disinfection performance is limited by a single method,besides,there exists the risk of secondary infection during maintenance.In this work,according to the physiological characteristics of the novel coronavirus,an air disinfection device based on thermally coupled corona discharge was proposed for the improvement of conventional plasma air disinfection technology,which adopted the wire-plate array electrode structure to initiate corona discharge,and utilized heating wires embedded in the collection plate to achieve centralized heating.The discharge parameters were measured,and a discharge power at stable operation was discovered to be as high as 5.6 W,for which the discharge law was found to obey the Townsend relationship.Measurement and simulation of the thermal parameters showed that,compared with the overall air heating,the efficiency of centralized heating was increased by 17 times,with minimal impact on the ambient temperature.Bacillus amyloliquefaciens and Bacillus subtilis bacteriophages were used as model bacteria and virus to verify the disinfection performance.Results demonstrate that the killing performance is effectively enhanced via thermally coupled corona discharge,with a removal rate of residual virus on the collection plate increasing by 99.97%,thereby reducing the risk of secondary infection.This work lays a device foundation for killing the airborne novel coronavirus,and also provides a technical reference for cutting its airborne transmission.