Coagulation Experiment Study For Indoor Little Contaminants In The Magnetic、DCV And ACV

Along with economic growth of our country and the industrial development speed increasing,the phenomenon of air pollution and urban haze is outstanding.The tendency have great threat to people’s health and lives,and the sickness environment indoor will leading to kinds of respiratory disease.The current environmental governance can use the way of dust extraction to remove except increasing pollution emissions of the atmosphere environment.But any way of the dust removing and filtration is very difficult for the particles with0.2mm⁰.4mm.The effective ways for these tiny particles can turn to larger particles through the coagulation and then to remove.This article will study the little contaminants’ coagulation under the electric field and magnetic field.In the article,the main contents and conclusions are as follows in the paper:（1）It analyses the main source、 chemical composition and influencing factors of the atmosphere in Beijing.（2）With the analysis for the force of particles,the mainly stress in the particles movement and collision phenomenon is Brown-stress.In turbulent flow,the particles have its gravity,flotage,Brown stress and thermophoretic force,the stress between particles and the flow field have field stress、drag stress,shear stress and magnus stress.Through the numerical calculation of scholars,magnus stress in the flow field can be ignored.The difference is that in the magnetic field have the magnetic stress;in the electric field have the electric stress.（3）The experimental device of condensation PM_2.5 was designed and developed,which includes the generator of fine particulate matter,the condensation device and the test device.The generator can not only generate multiple and specific particulate matter but also gather indoor particulate matter.The condensation device adopts the module design including the magnetic condensation module,the electricity condensation module and the other condensation module.We could use the one condensation mothod or the multiple condensation mothods in series when it is working.The test device can test the quantity of five kinds of particle diameter,so we can quantitatively analyse according to the condensation effect of five kinds of particle diameter.（4）When the environment of magnetic coagulation and electric coagulation is proceeding,we will analysis the factors’ influence of magnetic field intensity,wind velocity,flow rate and concentration in magnetic field;we will analysis the factors’ influence of DCV,Alternating Current Voltage and Alternating Current frequency、wind velocity,flow rate and concentration in electric field.Lastly we will reach the optimal parameter.When magnetic field intensity is 0.261 T,wind velocity is 1.8m/s,or DCV is 15 kV,wind velocity is 0.6m/s,higher Alternating Current frequency,the state of coagulation is perfect;opening the ACV is good for coagulation on electric coagulation;and then we will make comparison with themagnetic coagulation and electric coagulation,we get that the magnetic coagulation is good for larger particles to coagulate,while the electric coagulation is good for small particles to coagulate;we get that the magnetic coagulation is good for coagulation to happen;the influence of concentration should base on the two different ways.