| In recent years,due to severe fog and haze weather,a large number of inhalable particulate matter and other gas pollution enter the indoor,resulting in a sharp decline in indoor air quality,endangering human’s health.A lot of research shows that people spend more than 90%of their time inside buildings,and 0lder people and children stay indoors longer.Therefore,how to keep indoor air quality within the range of ensuring human health has become an important research topic.In this paper,a haze-absorbing wall air purification system was constructed based on assembly buildings.The haze removal function is integrated into the wall to give full play to the characteristics of large contact area between the wall and indoor air.In this paper,a haze-absorbing wall air purification system experimental station was built,and its purification performance for PM2.5,PM10 and formaldehyde and the related factors effecting the purification efficiency of the system(air velocity,air passage size and particle concentration)were studied experimentally.The experimental study include two parts,one is the purification efficiency of PM2.5,PM10 and formaldehyde,the other is the deposition efficiency of PM2.5 and PM10in the haze-absorbing wall system.At the same time,the purification efficiency of haze-absorbing wall system to PM2.5 was simulated by ANSYS FLUENT(When the air velocity at the inlet is 0.5m/s,the thickness of activated carbon module is 5cm and the size of air passage is 15cm),and the accuracy of the simulation was verified by comparing the simulation data with the measured results.It was found that the haze-absorbing wall system can effectively purify the air.After 215 minutes of operation,the purification efficiency of the system to PM2.5,PM10 and formaldehyde is more than 90%under all conditions of the experiment.The purification efficiency of haze-absorbing wall system to PM2.5 and PM10decreases with the increase of inlet air velocity,and decreases with the decrease of particle concentration.Under all working conditions,PM2.5 and PM10 in the simulation cabin can be basically removed by the haze-absorbing wall.When the air passage is 15cm and the air velocity is 0.1m/s,the haze-absorbing wall has the best purification performance for PM2.5 and PM10,which can change the air quality in the simulation cabin from serious pollution to good in the shortest time,and the time used is 65min and 75min respectively.With the increase of inlet air velocity,the purification efficiency of haze-absorbing wall to formaldehyde increases first and then decreases,and the peak value appears when the air velocity is 0.4m/s.In the experiment with a total duration of 115min,the decrease of formaldehyde concentration mainly occurred in the first 60min.When the formaldehyde concentration decreased to 0.1μg/m~3,the formaldehyde concentration in the simulation cabin began to stabilize.When the air passage is 20cm and the air velocity is 0.4m/s,the haze-absorbing wall has the best purification performance for formaldehyde.The deposition efficiency of PM2.5 and PM10 in the haze-absorbing wall decreases with the increase of inlet air velocity,and there is no linear relationship between the deposition efficiency and passage size.According to the order of deposition efficiency from small to large,the corresponding air passage sizes are 5cm,10cm,25cm,20cm and 15cm.Under all conditions,the deposition efficiency of PM2.5 is in the range of 14%to 30%,and that of PM10 is in the range of 24%to 45%.The haze-absorbing wall system cannot improve the air quality only by the spontaneous combustion settlement of particles.Under the experimental conditions in this paper,15 cm air passage size should be selected for the haze-absorbing wall system,which can effectively remove air pollutants in the shortest time. |
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