• Title/Summary/Keyword: Collection plate

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광폭 전기집진기의 집전특성에 관한 연구 - I. 집진판 간격과 방전극의 영향 -

  • 김용진;하병길;정상현;홍원석;여석준;유주식
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.10
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    • pp.939-946
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    • 2001
  • This study investigates the electrical and collection characteristics of a wide plate spacing electrostatic precipitator (ESP), using a pilot-scale one. Electrical operating characteristics and collection efficiency were measured for various shapes of discharge electrodes. The collection plate spacing ranged from 300 to 550 mm. Results of electrical characteristic and collection efficiency tests as a function of collection plate spacing, discharge electrode type, applied voltage, and particle diameter were obtained. Increasing the collection plate pitch and altering the corona electrode geometry was found to increase the collection efficiencies without increasing input power requirement. The best efficiency is achieved for the discharge electrode of twisted pin type.

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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.

Study on improvement of submicron particle collection performance in 2-stage parallel-plate electrostatic precipitators (2단 평행판 전기집진기의 서브마이크론입자 집진성능 개선 연구)

  • Yoo, K.H.;Oh, M.D.;Lee, J.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.3
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    • pp.323-332
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    • 1997
  • It was reported by some researchers that two-stage parallel-plate ESPs, commonly called electronic air cleaners, show decreasing behavior of collection efficiency as particle size decreases below about $0.03{\mu}m$. This phenomenon is attributed to partial particle charging characteristics, where some of incoming particles are not charged in the charging cell of 2-stage parallel-plate ESP. One way to improve the decreasing collection efficieny in that particle size range is to enforce particle charging quantity in the charging cell. In the present study, in order to do this a 2-wire series-type charging cell modified from a 1-wire normal-type one was suggested and investigated theoretically and experimentally concerning improvement of the collection efficiency. It was confirmed from the experimental and theoretical works that the collection efficiency was apparently improved.

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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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Dust Collection Characteristics of Multi-layer Multi-stage Porous Plate System with Ionizer and Dielectric-substance (이오나이저 및 유전체 방식을 도입한 다층 다단 다공성 플레이트 시스템의 집진특성)

  • Yoa, Seok-Jun
    • Journal of Power System Engineering
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    • v.17 no.6
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    • pp.63-72
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    • 2013
  • The main purpose of this study is to analyze the collection characteristics of multi-layer multi-stage porous plate system with ionizer and dielectric-substance experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with experimental parameters such as applied voltage, inlet velocity, stage number and inlet particle concentration, etc. In results, for multi-layer multi-stage porous plate system of inflow type, at 5 stage and $v_{in}$=2.58 m/s, the pressure drop becomes lower 15 $mmH_2O$ as 95 $mmH_2O$ than that of non-inflow type system. It is estimated that for the present system with ionizer and dielectric-substance, the collection efficiency represents 98.5% showing higher 5.2% comparing to that of multi-layer multi-stage porous plate system without ionizer and dielectric-substance at 5 stage, $v_{in}$=2.58 m/s and inlet concentration $3g/m^3$(fly ash).

Collection Characteristics of Multi-layer Multi-stage Porous Plate System (다층 다단 다공성 플레이트 시스템의 집진 특성)

  • Kim, I.K.;Yoa, S.J.
    • Journal of Power System Engineering
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    • v.14 no.5
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    • pp.10-16
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    • 2010
  • The main object of this study is to investigate the collection characteristics of multi-layer multi-stage porous plate system 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, tube diameter, inlet concentration, and stage number, etc. In results, the pressure drop becomes 22 to $115mmH_2O$ with increment of stage number (1 to 5) of porous plate system at tube velocity 15 m/s and tube diameter ${\Phi}8$. In case of fly ash and 5 stage, the collection efficiency becomes 90.5 to 95.7% increasing the tube velocity 12 to 15 m/s at inlet concentration $3g/m^3$ and tube diameter ${\Phi}8$. Additionally, it is estimated that the collection efficiencies of 5 stage are 94.3, 95.6 and 99.1% for fly ash, steel dust and based power, respectively (${\Phi}8$ tube, $V_t$ = 12m/s, inlet concentration $3g/m^3$).

Collection Characteristics of Wet-type Multi-layered and Multi-staged Porous Plate System (습식 다층 다단 다공성 플레이트 시스템의 집진특성)

  • Yoa, Seok-Jun;Kim, Joo-Yeon
    • Journal of Power System Engineering
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    • v.18 no.3
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    • pp.42-50
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    • 2014
  • The main object of this study is to investigate the collection characteristics of wet-type multi-layered and multi-staged porous plate system 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 water spray, inlet velocity, stage number and inlet particle concentration, etc. In results, for the present system of wet-type, the pressure drop represents 158 $mmH_2O$ higher 3% than that in dry-type at 5 stage and $v_{in}$=3.53 m/s. In case of 5 stage, $v_{in}$=3.53 m/s and water spray 250 ml/min, the collection efficiency of the present system becomes significantly higher as 99.7% comparing to that of the conventional wet-type scrubber. Additionally, for 5 stage and 250 ml/min, $SO_2$ removal efficiencies decrease with the increment of inlet velocity representing 75.0, 62.5, 50.0%, at $v_{in}$=2.12, 2.82, 3.53 m/s, respectively.

Particle Charging and Collection in Two-Stage, Parallel-Plate Electrostatic Precipitators (2단 평행판 정전식 집진기에서의 입자하전 및 포집)

  • 오명도;유경훈;이준식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.2
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    • pp.432-445
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    • 1994
  • From a theoretical analysis point of view, the 2-stage precipitator is decomposed into two units: charging cell and collecting cell. Collection efficiency predictions of the two-stage parallel-plate electrostatic precipitator have been performed theoretically incorporating with the charging and the collecting cells. Particle trajectorise passing the charging cell have been modeled as a simple one. Particle charge distribution at the outlet of the charging cell is calculated through integration of the present unipolar combined charging rate along the entire particle trajectory, and average charge of particles at the outlet of the charging cell is obtained from the particle charge distribution. As for the collecting cell, the diminution of particle concentration along the longitudinal direction of the collecting cell is investigated considering the conventional Deutsch's theory and the laminar theory. One should note that the collection efficiency formula derived is based on monodisperse aerosols. It has been confirmed through the analysis that predictions of particle charge by applying White's unipolar diffusion charging theory overpredict actual cases in the continuum regime, while predictions by Fuch's unipolar diffusion charging theory indicate the reasonable result in the same regime. Theoretical predictions of collection efficiency are also compared with the available experimental results. Comparisons show that the experimental results are consistently located in the collection efficiency region bounded by the two limits, the Deutsch and the laminar collection efficiencies. Finally design parameters of the 2-stage electrostatic precipitator have been investigated systematically through the one-variable-at-a-time method in terms of collection efficiency. Applied voltages on the corona wire of the charging cell and the plate of the collecting cell, and the average air velocity have been selected as the design parameters.

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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Effects of the Block Arrangement on the Collection Efficiency in the Two-Stage Electrostatic Precipitator with Charging Plate (평판형 방전판을 갖는 2단식 전기집진기의 집진판 블록배열이 집진효율에 미치는 영향)

  • 박성호;박청연;김태권
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.6
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    • pp.641-652
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    • 2000
  • The effect of block arrangement has been investigated on the particle deposition in the specified collecting cell of two-stage electrostatic precipitator by numerical analysis. Recirculation zone existed at the downstream of the block in the collecting cell, and the particles entering the recirculation zone were deposited on the collecting plate. Particle trajectory and deposition had considerably different phenomenon according to electrostatic and inertial effect, which depended on inlet mean velocity, electrostatic number, and particle diameter in the collecting cell. The total collection efficiency reached a minimum value through an interaction of electrostatic and inertial effect. In the computational domain, total collection efficiency for the case of two blocks in the computational domain was more than that of one block at the relative small electrostatic number. However as the block distance and inertial effect increased, the difference between the collection efficiency of two cases decreased. In the range of relatively small particle size total collection efficiency was always superior to particle collection efficiency that was predicted by Deutsch equation.

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