Indoor Air Purification By High Voltage Static Electricity Coupling Catalysis

High voltage static electricity coupling catalysis is an ideal method for indoor air purification due to its high efficiency,low energy consumption,and no secondary pollution.It is widely used in the simultaneous removal of particulate matter(PM)and volatile organic compounds(VOCs).In this paper,the coupling purifier is studied in depth to reveal its internal physical process related to air purification,optimize the dust removal performance,and improve the removal efficiency of VOCs.First,the corona discharge,airflow,particle charging,particle dynamics,and ozone mass transfer in the coupling purifier are studied by numerical simulation.It is shown that the existence of the corona electric field in pre-charger leads to a nonuniform flow field.However,the flow field gradually returns uniform with the increase of inlet wind speed.The precharger and the collection stage both have dust removal capacity.The removal efficiency decreases as the particle size decreases.The ozone generated during the operation is concentrated in the central zone downstream of the corona wire,and the distribution does not change with the inlet wind speed.Second,an experiment system is built to measure the sectional wind speed,particle removal efficiency,and ozone concentration.The simulation results are consistent with the experiment results,which validates the accuracy of the numerical model.Third,the dust removal function component in the coupling purifier,two-stage electrostatic precipitator,is analyzed and optimized.A general quantitative relationship between dust removal performance and its influencing factors is formulated.It is shown that the complete dust removal length is proportional to the square of collection plate spacing and inversely proportional to the repelling voltage.Moreover,properly shortening the precharger,extending the collection stage,reducing collection plate spacing and increasing repelling voltage are effective ways to improve dust removal performance.Finally,the built-in coupling of static electricity and catalysis is developed to improve the removal efficiency of VOCs and reduce air resistance.It is shown that the built-in coupling purifier is able to remove particles and VOCs while reducing ozone accumulation in a confined space.Compared to the rear type coupling,the built-in coupling is more advantageous in removing VOCs,but its ability to reduce ozone accumulation is poorer.