임팩션 효과에 편극전하 방식을 부과한 다층 다단 다공성 플레이트 시스템의 집진특성

Abstract

Recently fabric bag filter and electrostatic precipitator (ESP) are frequently used in as main collection equipment. Especially, fabric bag filter is the most widely used in existing industry low filtration velocity makes large scale equipment, filter clogging makes excessive pressure drop those kinds of disadvantages make cost higher than other devices because of periodic filter replacement. To improve this fabric bag filter, we need to study more. In this study, by introducing impaction and polarization charge we can make an experimental analysis of the particle collection characteristics of multi-layer multi-stage porous plate system which can miniaturization equipment scale. multi-layer multi-stage porous plate system with polarization charge to impaction effect keeps porous plates multi-layed and multi-staged. It makes particles get through tubes of plates and formed fast jet velocity. It is the system that applied to the way of being collected at internal black boxes through following layered black hole. Negative electrode and positive electrode have to be confronted each on the top and bottom of neighboring plates and approved of D.C. voltage. When increasing the number of stages, insulators can be installed in zigzag and collect fine particles by electrostatic force attributed to polarization phenomenon between plates. Re-entrainment can be prevented by maximizing electrostatic force effects inducing air current inflow. Thus, the main purpose of this study is to investigate the collection characteristics of multi-layer multi-stage porous plate system with polarization charge to impaction effect, experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with the experimental parameters such as inlet velocity, stage number, and applied voltage, etc. In results, the collection efficiency becomes higher 92 to 98 % with increment of stage number of multi-layer porous plate system with polarization charge to impaction effect (1 to 5 stages, applied voltage 2.5 kV), while the gradient of increment of collection efficiency is to be lower. Additionally, it is estimated that with increment of stage number(1 to 5 stage) at tube diameter 12 mm, inlet velocity = 3.11 m/s, the pressure drop becomes much higher as 18, 62, 73, 101 and 134 mmH2O, respectively. This system might have an effort to maximize particle collection effect by using impaction of particle and electrostatic force of polarization charge also it might be more possible to miniaaterize the device and manage large flow and it might have an advantage that can reduce maintenance cost because of it does not need to use the filter.