• Title, Summary, Keyword: Electrostatic precipitator

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A Study on Prediction of Collection Efficiency of Electrostatic Precipitator Using Eulerian Numerical Analysis (오일러리안 수치해석법을 이용한 전기집진기의 집진효율 예측에 관한 연구)

  • Park, Jeong-Ho;Chun, Chung-Hwan
    • Proceedings of the KSME Conference
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    • pp.618-623
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    • 2001
  • The transport of charged particles in electrostatic precipitator is investigated by Eulerian numerical analysis. Collection efficiencies are calculated using various combinations of the assumptions about flow field, turbulent diffusivity and boundary condition at collecting electrode. The characteristics of calculated collection efficiencies are compared with the trends of published experimental results. It is found that the collection efficiency for the case using nonuniform turbulent flow field, nonuniform turbulent diffusivity and zero concentration boundary condition at collecting electrode is the most suitable for the prediction of collection efficiency of electrostatic precipitator.

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NUMERICAL INVESTIGATION ON CAPTURE OF NANOPARTICLES IN ELECTROSTATIC PRECIPITATOR WITHOUT CORONA DISCHARGER (코로나 방전기가 없는 전기집진기의 나노입자 집진에 관한 수치해석)

  • Lee, J.W.;Jang, J.S.;Lee, S.H.
    • 한국전산유체공학회:학술대회논문집
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    • pp.103-108
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    • 2010
  • This article presents computational fluid dynamics (CFD) simulations of nanoparticle movements and flow characteristics in laboratory-scale electrostatic precipitator (ESP) without corona discharge, and for simulation, it uses the commercial CFD program(CFD-ACE) including electrostatic theory and Lagrangian-based equation for nanoparticle movement. For validation of CFD results, a simple cylindrical type of ESP is simulated and numerical prediction shows fairly good agreement with the analytical solution. In particular, the present study investigates the effect of particle diameter, inlet flow rate, and applied electric potential on particle collection efficiency and compares the numerical prediction with the experimental data, showing good agreement. It is found that the particle collection efficiency decreases with increasing inlet flow rate because the particle detention time becomes shorter, whereas it decreases with the increase in nanoparticle diameter and with the decrease of applied electric voltage resulting from smaller terminal electrostatic velocity.

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The Improvement of Collection Efficiency of Electrostatic Precipitator (전기 집진기의 집진 효율 향상에 관한 연구)

  • Ahn, Kook-Chan;Kim, Bong-Hwan;Lee, Gwang-Seok
    • Journal of the Korean Society of Safety
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    • v.17 no.4
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    • pp.25-30
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    • 2002
  • This paper demonstrates the effects of dust electrical resistivity on electrostatic precipitability. The effects of gas temperature, velocity and humidity on the collection efficency were considered by used of coal fly ashes from fluidized bed combustion boiler. The experiments for collection efficiency were carried out in the pilot plant. The ashes which have non-spherical geometry and high electrical resistivity were used. Electrical resistivity is an important property for the collection efficiency in the electrostatic precipitators. Fly ash resistivity as a function of temperature up $350{\circ}C$ and water concentration(up to 15%) has been experimentally investigated using the resistivity test equipment consisted of the movable electrode, dust cup, and furnace. As the resistivity of fly ash in the operating temperature($150{\circ}C$) of an electrostatic precipitator was measured higher than $1010{\Omega}{\cdot}$cm, flue gas conditioning in the electrostatic precipitator to reduce the resistivity of fly ash is required.

Lumped Parameter Modeling and Analysis of Electromagnetic Vibration Exciter for Vibrating Rapper of Electrostatic Precipitator (전기 집진기의 진동 탈진을 위한 전자기 진동 가진기의 집중매개변수 모델링 및 해석)

  • Kim, Je-Hoon;Lee, Jung-Hun;Kim, Jin-Ho;Jeong, Sang-Hyun;Han, Bang-Woo
    • Journal of the Korean Magnetics Society
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    • v.21 no.2
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    • pp.61-66
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    • 2011
  • The miniaturization of electrostatic precipitator is becoming a key element to the success of the efficient electrostatic precipitator due to the limited space allowed to install electrostatic precipitator in subway tunnel. Nowadays, a research on electrostatic precipitator in urban railroad equipment technology is under an active study. Finite element method has been used one of the most popular techniques, but it consumes a lot of time especially in computation iterations. Accordingly, the lumped parameter analysis can be an alternative tool to FEM because of its computation iteration capability with fair accuracy. In this paper, lumped parameter model and the simulation results are presented. In addition, the result of lumped parameter analysis is compared with those obtained from finite element analysis for verification.

Design of a Guide Vane for Improving Inside Flow Uniformity of Electrostatic Precipitator (전기집진기 내부의 유동 균일성 향상을 위한 가이드 배인의 최적설계)

  • Noh, Kyung-Wook;Bae, Seong-Jun;Park, Sookhee;Kang, Sunkyun;Lee, Jangmyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.4
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    • pp.523-528
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    • 2013
  • In recent years, many efforts are increasingly being made to conserve the natural environment with enhanced emission standards and air quality standards. Also there are various methods necessary to be researched to minimize the emission of air pollutants. In particular, boilers of industrial facilities are major portions of the air pollution. The front duct which needs to be designed to reduce the gases to the electrostatic precipitator requires a bent tube, a reduction/extend tube and an auxiliary equipment, that is, a guide vane. This paper proposes an optimum design of the guide vane by a case study for electrostatic precipitator's flow uniformity. The operating conditions of this study are as follows: BMCR (Boiler Maximum Continuous Rate) and MGR (Maximum Guaranteed Rate) are 75%, 50%, and 30%; turbulent fluid dynamics model is based upon K-${\varepsilon}$ formulation. Presentation of the computed motion of particles is found to be quite useful to predict the precipitator performance by use CFD (Computational Fluid Dynamics).

A Study of Fly Ash Resistivity Characteristics Generated from the Coal Fired Power Plant as a Function of Water Concentration and Temperature (석탄 화력발전소에서 발생되는 석탄회의 수분함유량 및 온도에 따른 비저항성 특성 연구)

  • Ku, Jae-Hyun;Lee, Jung-Eun;Lee, Jae-Keun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.4
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    • pp.526-532
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    • 2000
  • Recent studies have been directed toward obtaining a better understanding of the application of electrostatic precipitators to collect fly ash particles produced in a coal-fired power plant. Electrical resistivity can be described as the resistance of the collected dust layer to the flow of electrical current and is an important property for the collection efficiency in the electrostatic precipitator. In this paper, fly ash resistivity as a function of temperature up to $450^{\circ}C$ has been experimentally investigated using the resistivity meter consisted of the movable electrode, dust cup, and furnace. Resistivity was found to increase with increased temperature up to $200^{\circ}C$ due to the reduction of water concentration and then gradually decrease with increased temperature due to the activation of electrons. As the resistivity of fly ash in the flue gas temperature of $150^{\circ}C$ was measured >$10^{10}$ ohm cm, the efficiency of fly ash removal in the electrostatic precipitator might be expected to be low due to back-corona phenomenon. Flue gas conditioning in the electrostatic precipitator to reduce the resistivity of fly ash as required.

A Numerical Study on the Collection Characteristics of a Wide Plate-Spacing Electrostatic Precipitator (광폭 전기집진기의 집진 특성에 관한 수치적 연구)

  • 김용진;홍원석;정상현;하병길;하대홍;유주식
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.12
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    • pp.1205-1213
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    • 2001
  • The electrical characteristics and particle collection efficiency of a wide-plate spacing electrostatic precipitator are numerically investigated, and the results are compared with those obtained experimentally. The electric potential and field strength near the collection plate increase with increasing the plate spacing. The electric field strength of a discharge electrode of a twisted pin type is larger than that of a rectangular type. As the roughness factor of the discharge electrode wire becomes small, or the plate spacing becomes narrow, the corona current of the precipitator increases. The numerical results agree well with those obtained from experimental method.

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Flow Distribution in an Electrostatic Precipitator with a Perforated Plate (타공판에 따른 전기집진기 내의 유동분포)

  • Kim, Dong-uk;Jung, Sang-Hyun;Shim, Sung-Hoon;Kim, Jin Tae;Lee, Sang-Sup
    • Clean Technology
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    • v.25 no.2
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    • pp.147-152
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    • 2019
  • Electrostatic precipitator that shows a good performance for the removal of particulate matter is important for controlling emissions from industrial facilities and power plants. The efficiency of the electrostatic precipitator on the removal of particulate matter is highly affected by the flow pattern inside the electrostatic precipitator. A number of studies have been conducted to obtain uniform flow distribution inside electrostatic precipitators. An electrostatic precipitator (ESP) with a length of 3.5 m and a height of 0.875 m was designed and installed in this study. The ESP included an inlet duct, diffuser, body, and contractor. Three perforated plates were installed in the diffuser of the ESP. Five pitot tubes were installed vertically and used to measure flow distribution in the cross section of the ESP body. Root mean square deviation value (RMS%) was used to examine the flow distribution inside the ESP when the perforated plates were installed in the diffuser. Flow distribution was also investigated in relation to the porosity of the perforated plate. The results showed that the perforated plates improved greatly the flow distribution inside the electrostatic precipitator. In addition, the most uniform flow distribution was found with 40%, 50%, and 50% porous perforated plates located from the inlet of the diffuser.

Electrostatic Precipitability of the Coal Fly-Ash by the Pilot Scale Test

  • Ahn, Kook-Chan;Kim, Bong-Hwan;Jang, Yang-Sik
    • Journal of Mechanical Science and Technology
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    • v.15 no.5
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    • pp.602-612
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    • 2001
  • The equation of the particle collection efficiency proposed by Deutsch has been modified through the various experiments to correct the errors caused by the assumptions made for the equation. In order to get an modified Deutsch equation that can be applied to real conditions, a pilot scale electrostatic precipitator is used. The effects of operational variables on the particle collection efficiency are evaluated. Particle resistivity, gas temperature, moisture contents in gas, gas velocity and particle concentration are used as the operational variables. Two different types of coal fly-ash obtained from the fluidized bed combustor and the pulverized coal combustor are used as test particulate to evaluate the effect of the physiochemical and electrical characteristics of the particle on the particle collection efficiency. The experimental results are fitted with the modified Deutsch equation made by Matts-Ohnfeldt and the extended Deutsch equation made by E. C. Potter to evaluate the effect of the particle characteristics and the operation conditions on the particle collection efficiency of the electrostatic precipitator.

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A Study on the Electrostatic Precipitation as a Function of Resistivity using various Indoor Dusts (실내 분진의 비저항 특성에 따른 전기집진 효율에 대한 연구)

  • Cheong, Seong-Ir;Choi, Young-Min;Ahn, Young-Chull;Lee, Jea-Keun;Kangk, Eun-Chull;Lee, Euy-Joon
    • Proceedings of the SAREK Conference
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    • pp.448-453
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    • 2006
  • Electrical resistivity is an important property for the collection efficiency in the electrostatic precipitator. In this paper, electrical resistivities of tobacco dusts, yellow sand dusts and pine pollens are measured using a high voltage conductivity cell based on JIS B 9915. The resistivities of three kinds of indoor dusts are about $1{\times}10^7\;{\Omega}{\cdot}cm^2$ in the normal range and dust collection efficiency using an electrostatic precipitator at to face velocity of 1.0 m/s shows over 99% for the three kinds of indoor dusts.

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