유전체 및 이오나이저 방식을 도입한 다층 다단 다공성 플레이트 시스템의 집진특성

Abstract

Air pollution that arise due to industrial activities has become worldwide problem. More than all, dust scattering in industrial settings has bad effect on atmosphere. Thus dust collector for removal dust in emission is becoming more important to industrial activities. Recently, the fabric bag filter and electrostatic precipitator mainly used for collection equipment. Especially, fabric bag filter is the most widely used in existing industry low filtration velocity makes large scale equipment, but fabric bag filter have problem of low filtration velocity and maintenance of fabric filter have been carried out. And ESP has the merit to treat various flow rates without the significant pressure drop. but ESP has problem of large scale of equipment and need for high voltage. Therefore, we need to study low pressure drop and high collection efficiency maintain for long periods of time. Thus, the main purpose of this study is to investigate the collection characteristics of multi-layer multi-stage porous plate system with dielectric-substance and ionizer. This system principles are electric field due to polarization of dielectric-substance and charging dust particles to ionizer. Polarization charge of dielectric-substance is 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 stage, insulators can be installed in zigzag. And ionizer is corona discharge in low voltage, installed channel of system. These characteristics are increasing th collection efficiency of fine dust particles and resolve problem of scattering dust. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for present system with the experimental parameters such as inlet velocity, stage number, introduction of dielectric-substance and ionizer, inflow current holes, particle diameter, and concentration. etc. In results, the collection efficiency becomes higher 93 to 96.7% with increment of stage number of multi-layer multi-stage porous plate system with dielectric-substance and ionizer (1 to 5 stages, instituted dielectric-substance and ionizer), 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 inlet velocity 3.11 m/s, inflow current holes at 4 and 5 stage, the pressure drop becomes much higher as 15, 33, 54, 75, 101 mmH2O, respectively. Then particle mean diameter is more bigger (35 to 45 ㎛), collection efficiency is increasing due to particle inertial force and impact. When increasing concentration is too.