Experimental Study On Formaldehyde Photodegradation Under Intensive Pulsed Light Irradiation

VOCs as the main pollutants in indoor air quality,has been serious harm to human health,research and development of new air purification technology become a hotspot.Intensive pulsed light technology has been proven in indoor air sterilization and removal of VOCs has a good effect,but the research in China is very limited currently.In view of this,this paper used the performed experimental analysis to analsys effect of pulsed light formaldehyde degradation under different conditions,researched related to the impact of environmental factors and the reaction of formaldehyde degradation byproducts.Firstly,this paper built a pulsed light degradation of formaldehyde experimental system,designed of the 16 experiments,respectively,for the moisture content,the upstream concentration,wind speed and impact equivalent diameter tube degradation efficiency of formaldehyde were univariate comparative analysis.The results show that: the removal of formaldehyde once pulsed light through efficiency increases with wind speed increases,the upstream formaldehyde concentration,moisture content increases equivalent duct diameter increases.Secondly,this paper used the partial correlation analysis and multiple linear regression method,built the mathematical model of formaldehyde concentration between pulsed light dynamic removal of formaldehyde removal efficiency with duct cross-sectional area,wind speed,relative humidity and upstream concentration.And in accordance with the experimental data to validate the mathematical model,the results show that the theoretical calculation of the mathematical model and dynamic pulsed light to remove formaldehyde with good prediction.Finally,this paper used experimental methods to generate byproducts of formaldehyde in dynamic condition for IPL.It has been shown in other papers that tie main byproduct of formaldehyde in dynamic condition for IPL is CO and CO2.The results showed: when pulsed light produces only trace amounts of formaldehyde degradation CO,CO2 concentration in the air duct average increase of 9.6 percent,could alleviate the adverse effects of byproducts increased by a modest fresh air.