Numerical Simulation And Study Of Airflow Distribution In Electrostatic Precipitator

Along with new emission standard of air pollutants coming out, electrostatic precipitator faces great stress and challenge. How to improve dust collecting efficiency economically and effectively and reduce dust emission quantity are becoming focuses which operators research on. Airflow distribution is one of important factors affecting dust collecting efficiency of electrostatic precipitator. Previously, Airflow distribution adjusting is solved by model experiments, but model experiments take a great deal of manpower, time and material resources. Along with the development of numerical calculation technique, numerical simulation becomes a strong means to solve this kind of problems gradually. Simulating flow field in electrostatic precipitator using effective CFD software can offer important parameters to airflow distribution design and alteration, shorten experiment period and decrease blindness, it has vital significance on advancing environmental benefit, social benefit and economical benefit of electrostatic precipitator.This paper takes the technique way of simulating model — simulating antetype, takes the electrostatic precipitator with 145m~2 electric field area of certain steel mill as antetype, bases on principle of Computational Fluid Dynamics and takes FLUENT as platform, measures and laws suitable for electrostatic precipitator flow field simulation is explored and the effect of airflow adjusting devices on flow field is analyzed, the results of calculation are compared with model experiment. Then, the flow field of electrostatic precipitator with 145m~2 electric field area in HeBei XinJi Ao-sen Steel Corporation is simulated, the scheme got from simulating calculation is used practically and gains favorable effect.Main conclusions obtained in this paper are as follow:(1) The flow field of electrostatic precipitator is simulated using FLUENT , standard κ-ε model and wall function, this calculation method is reliable, the results meet the needs ofproject, it can guide practical project directly.(2) When airflow meets airflow distribution board, airflow in the midst with high speed loses greatest kinetic energy and has greatest static pressure increased; airflow all around loses little kinetic energy and has little static pressure increased. When putting two airflow distribution boards in the inlet smokebox, the change of static pressure concentrates on the first board, the change of the second board is not obvious.(3) When simulating airflow distribution board using porous-jump model, there is greater difference between calculating results and experiment results near the board, but velocity distribution of them goes consistent when there is a certain distance away from the board.(4) It is not enough to put airflow distribution boards in the inlet smokebox only, it needs to setup airflow guide plates regarding circs. Airflow distribution boards in the outlet smokebox can improve velocity distribution of the section at the electric field outlet, but it has little influence on the airflow distribution in electric field.