粉尘传感器测量喷涂过程细颗粒物(PM2.5)分布规律的研究

Study on Distribution of Fine Particles (PM2.5) in Spraying Process Measured by Dust Sensor

涂装作业时产生的大量漆雾是重要的细颗粒物(PM2.5)污染源之一。开展涂装喷涂时PM2.5分布规律的研究,对于保护工人身体健康、提高大气质量有重要意义。本文使用粉尘传感器分析了喷涂距离、时间、风速、偏移距离等因素对PM2.5分布的影响。结果表明:随着喷涂距离增加,PM2.5浓度开始时逐渐提高,而后逐渐降低.在0.9~1.2m达到最大稳定状态;随着喷涂时间增加,PM2.5浓度逐渐提高;有风时PM2.5浓度迅速降低,随着风速增加,PM2.5浓度逐渐降低;随着距漆雾中心径向偏移距离增大,PM2.5浓度降低,漆雾中心下方PM2.5,浓度相对于漆雾中心上方降低较慢;将传感器布置在距离喷嘴0.9~1.2m、漆雾中心下方0.3~0.4m处,可以较好地监测喷漆时PM2.5浓度。

A large amount of paint mist is produced during the coating operation,which is one of the important pollution sources of fine particulate matter(PM2.5).A research on the distribution of fine particles during spraying process is important for protecting workers 'health and improving air quality.In this paper,the in fluence of spraying distance,time,wind speed and offset distance on PM2.5 distribution is analyzed by dust sensor.The results show that,with the increase of spraying distance,PM2.5 concentration gradually increases at the beginning and then gradually decreases,reaching the maximum stable state at the distance from 0.9 m to 1.2 m.As the spraying time increases,PM2.5 concentration gradually increases.The PM2.5 concentration decreases rapidly when there is wind.As the wind speed increases,the PM2.5 concentration decreases gradually.As the radial offset distance from the center of the paint mist increases,the PM2.5 concentration decreases,and PM2.5 concentration decreases slowly under the nozzle compared with that above the nozzle.The sensor can be placed at a distance of 0.9 m to 1.2 m from the nozzle and 0.3 m to 0.4 m below the center of the paint mist to better monitor the PM2.5 concentration during painting process.