Study On The Respiratory Tract Exposure Of Particulate Pollutants Under Different Indoor Air Putification Mechanisms

In recent years,the air quality in many cities in China has shown severe pollution,which has caused explosive growth in patients with respiratory diseases.Therefore,the control of indoor air quality(particulate pollutants)has received widespread attention.Methods for controlling indoor air quality(particulate pollutants)The main purpose is to adjust the ventilation volume and use filtering equipment.With the improvement of energy-saving requirements,the airtightness of the building has been strengthened,so that indoor pollutants cannot be eliminated in time.Different indoor purification devices have begun to be used in large quantities.The filter-type purification device has a high market share,but its filter needs to be replaced regularly and it is easy to cause secondary pollution,and the negative ion purification device without consumables and zero noise enters people’s field of vision.Different purification mechanisms will have different effects on the concentration and size distribution of particulate pollutants,and then affect the exposure of particulate pollutants to the human respiratory tract.In this paper,an external model of the human respiratory tract obtained based on CT tomography and 3D model reconstruction technology is used to conduct experimental research on the exposure of particulate pollutants to the respiratory tract under different indoor purification mechanisms.To compare the differences between different indoor purification mechanisms;secondly,to quantitatively assess the risk of human inhalation exposure when using different purification mechanisms by counting the exposure dose of particulate pollutants in the lower respiratory tract;finally,to adjust the negative ion concentration by adjusting different distances to quantify different negative ion concentrations and particle pollution Between lower respiratory tract exposure doses.Based on the same initial concentration,the attenuation and removal efficiency of particulate pollutants by different purification mechanisms during non-release source dilution were studied.The results show that the attenuation constant of 0.5 ～ 10μm particles: K anion> K filter type,and the removal efficiency of 0.5 ～ 10μm particles: E anion> E filter type.Compared with the filter type purifier,the negative ion purifier has better short-term(<60min)control effect;due to the coagulation effect of negative ions on particulate pollutants,compared with the filter type purifier,the negative ion purifier has a 0.5 ～ 2.5 Cumulative exposure of μm particles in the lower respiratory tract decreased by 20% in 1 h.The negative ion concentration was measured by changing the distance from the negative ion release source to establish a quantitative relationship between different negative ion concentrations on the exposure of particulate pollutants in the human respiratory zone and the lower respiratory tract.The results show that in a certain environment,the concentration of negative ions has the best effect on the removal of particulate pollutants;the higher the concentration of negative ions,the more significant the aggregation of particulate pollutants;compared with the concentration of negative ions corresponding to a distance of 1.0m,the negative ions When the concentration is reduced by 2 times(distance 1.5m),the cumulative exposure of particulate pollutants in the lower respiratory tract is increased by 15%,the concentration of negative ions is reduced by 4 times,and the cumulative exposure of particulate pollutants in the lower respiratory tract is reduced by 20%.