Experimental Study Of Non-intercept Air Purifier Removal Effect

Air is the necessity for the survival of mankind.People’s health condition is seriously related to the air quality.However,with the acceleration of industrialization,people are suffering from unprecedented issues concerning the air quality.Ever since2013,the hazy weather arising from PM_2.5.5 pollution has invaded the most parts of the mid-east region of our country with high frequency,which has adverse influence on the acreage up to 1.9 million square kilometers.The particle of PM_2.5 could directly enter into and then attach to the bronchus and alveoli,resulting in various diseases in different systems of human body.On the other hand,although people will spend 87%of the daily time indoors,natural ventilation is still the main type of ventilation for residence in our country.Thus,concentrations of PM_2.5.5 outdoor will have a strong impact on the indoor environment.In the meantime,the smoke from cigarette and solid fuel burning is also the important reason for indoor pollution.Nowadays,the mainstream indoor air cleaner removing PM_2.5 can be divided into the mechanical filter type of air cleaner,the electrostatic air cleaner and the combined type of air cleaner.Each of the aforesaid type has its insurmountable shortcomings:the energy consumption of mechanical filter type is very high due to its high requirements for the drought fan and its large resistance;and the electrostatic and combined type may ionize the oxygen in air and produce ozone.To solve aforesaid problems,this study focuses on the new kind of particle traps with the technical theory combining the tangential flow filtration with the adsorption methods.On one hand,by applying the knowledge of fluid mechanics,the traditional mechanical air purifier is transformed into tangential flow type so that the resistance of the air cleaner can be reduced greatly.On the other hand,in accordance with the relevant provisions provided in GB/T18801-2015,the experiment module is designed and arranged,the device is put into the experiment module and the CADR value and the effective filter efficiency of the air cleaner are measured under the condition of no other interference factors.By comparing to the filter efficiency of other normal purchasable air filter materials in such device,the factors that could influence the purification efficiency of air cleaner are analyzed and one filter material with best general effect is picked out.The selected material will be hydrophobic modified to enhance its regeneration ability.This study explores the influence of the structure and property of the experimental materials on the filter efficiency of the new type particle traps.The traditional adsorption type of air cleaners all belong to chemisorptions,which are mainly used for wiping out harmful gases like VOC etc.In this thesis,the method of physical adsorption is for the first time applied to the removal of particulate matter,which will provide new idea and theory for the study of air cleaners.In addition,we have conducted the simulation for the flow field of inner flow pass of the air cleaner and fluid flow field inside experiment module to analyze the influence of the inner fluid flow of the tangential flow type device on the filter efficiency of the air cleaners.