• Title, Summary, Keyword: Electrostatic precipitator

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Propoerties of Beneficated Fly Ashes (미연탄서를 제거한 플라이애쉬의 특성)

  • ;Sakai Etusuo;Daimon Masaki
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.613-618
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    • 1999
  • This paper discuss the chemical, physical and mineral properties of classified fly ashes by electrostatic precipitator and calcinated fly ashes at 50$0^{\circ}C$. The electrostatic precipitator in coal fired power plant has a number of hopper in the direction of flue gases. The properties of fly ashes collected at each hopper in the electrostatic precipitator are different. Superfine, fine and ordinary fly ashes can be collected respectively at each hopper. The carbon content in fly ash is influenced on the viscosity of paste. By calcination, the carbon content in fly ash is decreased and the fluidity of paste is improved.

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A Study on the Collection Characteristics of a Wide Plate-Spacing Electrostatic Precipitator -II. Effect of Wave Form of Pulse Energization - (광폭 전기집진기의 집진특성에 판한 연구 - II. 펄스 하전 파형의 영향 -)

  • 김용진;하병길;정상현;홍원석;하대홍;유주식
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.11
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    • pp.1059-1064
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    • 2001
  • This study Investigates the effect of the wave form of pulse energization on the collection characteristics of a wide plate spacing electrostatic precipitator. For the semi-pulse energization, the peak current and voltage of the energization increases with increase of the pulse period, and the corona current increases, as pulse ratio decreases. For the micro-pulse energization, the corona current increases with increase of the pulse voltage. The collection efficiency of semi-pulse and micro-pulse energization is larger than that of DC charge.

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Collection Efficiency of Electrostatic Precipitator using Moment Method (모멘트 방법을 이용한 전기집진기의 집진 효율)

  • 정창훈;이규원
    • Journal of Korean Society for Atmospheric Environment
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    • v.18 no.5
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    • pp.345-353
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    • 2002
  • A study of polydispersed aerosol dynamics by Electrostatic Precipitator (ESP) was carried out. The log-normal particle size distribution was assumed and moment method was considered. In order to apply moment method in Deutsch-Anderson equation, Cunningham slip correction factor and Cochet's charge equation were simplified for certain range of particle size. The three parameters, which explain the particle size distribution, such as total number concentration, geometric mean diameter, and geometric standard deviation were considered to derive the analytic solution. The obtained solution was compared with available numerical results (Bai et al., 1995). The comparison of the numerical and analytic results showed a good agreement.

A Study on Collection Efficiency of Pilot Electrostatic Precipitator (연소장치를 이용한 소형 전기집진장치의 집진 효율에 관한 연구)

  • 한재균;최금찬
    • Journal of Korean Society for Atmospheric Environment
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    • v.9 no.2
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    • pp.125-131
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    • 1993
  • Electrostatic Precipitator has been widely used to get high efficiency which is required for collection of fine particles. In order to provide collection efficiency and size distribution data for a pilot electrostatic precipitator, a pilot study has been conducted on fly ash from pulverized coal burning apparatus. The aims of this study are to investigate characteristics of electric charge, to measure collection efficiency varied with the applied voltage, to get an optimum current and current density. Optimum current density was obtained to 0.7mA/$cm^2$ at the average electric field strength 2.33kV/cm in this experiment. Maximum particle collection efficiency was indicated 99.21% at the applied voltage 7kV. Finally, particle size distribution is also compared with photographic results. Both coarse and fine particles at the range of 0.5$\sim$2$\mu$m and 3$\sim$10 SEM $\mu$m were clearly removed by increasing applied voltage.

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Numerical Study of Particle Collection and Entrainment in Electrostatic Precipitator (집진기내 입자 포집과 비산 문제에 대한 수치적 연구)

  • Kim, Ju-Hyeon;Kweon, Soon-Cheol;Kwon, Ki-Hwan;Lee, Sang-Hwan;Lee, Ju-Hee
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.1
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    • pp.27-35
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    • 2012
  • A numerical simulation for particle collection efficiency in a wire-plate electrostatic precipitator (ESP) has been performed. Method of characteristics and finite differencing method (MOC-FDM) were employed to obtain electric field and space charge density, and lattice boltzmann method (LBM) was used to predict the Electrohydrodynamic (EHD) flow according to the ion convection. Large eddy simulation (LES) was considered for turbulent flow and particle simulation was performed by discrete element method (DEM) which considered field charging, electric force, drag force and wall-collision. One way coupling from FDM to LBM was used with small and low density particle assumption. When the charged particle collided with the collecting plate, particle-wall collision was calculated for re-entertainment effect and the effect of gravity force was considered.

A Study on the Collection Characteristics of a Moving Electrode Electrostatic Precipitator - I. Effect of Collection Plate Velocity - (이동 전극형 전기집진기의 집진특성에 관한 연구 - I. 집진판 이동 속도의 영향-)

  • Kim Yong-Jin;Ha Byung-Kil;Jeong Sang-Hyun;Moon Sang-Cheol;Yoo Joo-Sik
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.10
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    • pp.901-907
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    • 2004
  • This study investigate the effect of collection plate velocity on the electrical and collection characteristics of a moving electrode electrostatic precipitator (MEEP). Though a high resistivity fly ash is attached at the collecting electrode, the MEEP has very stable characteristics of voltage and corona current. Collection efficiency, corona current, and overall collection efficiency are increased, as the magnitude of the collection plate velocity increases.

Charging and Collection Characteristics of Aerosol Nanoparticles in an Electrostatic Precipitator (전기집진기에서의 에어로졸 나노입자의 하전 및 집진 특성 연구)

  • Han, Bang-U;Hwang, Sun-Cheol;Hong, Won-Seok;Jeong, Sang-Hyeon;Kim, Yong-Jin
    • 연구논문집
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    • pp.21-28
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    • 2004
  • In this study, we report an investigation for the charging and collection of aerosol nanoparticles in an electrostatic precipitator (ESP) according to particle charging and diffusion effects. The competition between charging probability and diffusion effect determines the collection efficiency of nanoparticles in the ESP. In conclusion, collection efficiency continuously decreased with the reduction in the particle size. This indicates that poor partial charging effect of nanoparticles is more dominant than their diffusion effect in the ESP for the nanoparticles in the particle size range of 4-20 nm. Theoretical calculations using a unipolar diffusion charing theory were in good agreement with the experimental data for the nanoparticles less than 20 nm in diameter.

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A Study on the Performances of Exhaust Gas Purification at Process on the Development of Corona Discharge Type Electrostatic Precipitator for Diesel Engines (디젤엔진용 코로나 방전식 전기집진장치의 개발 과정에서의 배기 정화 성능에 관한 기초연구)

  • Son, Byong-Ho;Bae, Jong-Uk
    • Journal of the Korean Society of Marine Engineering
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    • v.31 no.8
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    • pp.904-910
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    • 2007
  • In this study an experimental research has been conducted to reduce NOx and smoke emission from diesel engine exhaust gas simultaneously by application of corona discharge type electrostatic precipitator(ESP). The ESP was installed between exhaust gas silencer and outlet terminal of exhaust gas system. The operating conditions as input parameters taken in this experiment were corona power input, gas velocity and equivalence ratio of gas. It was found that the corona discharge type ESP has notable effect on reducing smoke in exhaust gas but appeared to bring slight effect on reducing NOx.

Effects of the Block Distance of Collecting Plate and Particle Size on the particle Deposition Efficiency in the Two-Stage Electrostatic Precipitator (2단식 전기집진기의 집진판 블록간격 및 입자크기가 입자의 부착효율에 미치는 영향)

  • 박청연
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.2
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    • pp.165-178
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    • 2000
  • In this study the effects of block distance have been investigated on the particle deposition efficiency in the collecting cell of two-stage electrostatic precipitator by numerical analysis. Particle trajectories have been changed by the electrostatic and inertial force of particle with the inlet velocity electrostatic number and particle diameter. The total deposition efficiency has a minimum value by the interaction between the effect of particle inertial force and electrostatic force in the collecting cell. The increase of block distance makes the total deposition efficiency decrease under the range of the particle size which has the minimum deposition efficiency. However beyond the range of particle size which has minimum deposition efficiency total deposition efficiency has no trend with the variation of block distance.

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Particle removal characteristics of high-velocity electrostatic mist eliminator (정전 고속 미스트 엘리미네이터의 포집 효율 특성)

  • Kim, Jin-seon;Kim, Hak-Joon;Han, Bangwoo;Woo, Chang Gyu;Kim, Yong-Jin;Lee, Sangrin;Moon, Sangchul
    • Particle and aerosol research
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    • v.14 no.4
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    • pp.121-133
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    • 2018
  • In this study, we developed a flat-plate type wet electrostatic precipitator that generates stable corona discharge compared to wire type discharge electrode. In order to compare the particle removal efficiency according to the shape of the discharge electrode such as the variation of the horizontal and vertical distance between spiked edges, and the variation of the height of discharge pin support were tested. As a result, when the horizontal distance between spiked edges was increased up to 36 mm, the vertical distance between spiked edges was increased up to 54 mm, and the height of the discharge pin support was increased up to 76 mm, the removal efficiency of PM10 was maintained at approximate 60.0%. Furthermore, the removal efficiency of particles over $5{\mu}m$ was about 80% or more. When the flow rate was 4 m/s, the gap between collection plates was 60 mm, and -14 kV was applied to the discharge electrode. The particle removal efficiency of the flat-plate type electrostatic precipitator was maintained when the horizontal and vertical distance between spiked edges, and the height of the discharge pin support was below a certain level. Those variables may be the important design factors for the shape of the discharge electrode. Therefore, when designing the electrostatic precipitator with multiple channels, the horizontal and vertical distance between spiked edges, and the height of discharge pin support must be selected in consideration of the weight of the discharge electrode and the processing cost.