• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.11a
• /
• pp.63-64
• /
• 2003

원심력집진기는 장치가 간단하지만 집진효율이 낮아 주로 여과포집진장치 및 전기집진장치의 전단에만 사용되는 단점을 가지고 있다. 여과포집진장치는 고효율의 집진성능을 가지고 있지만 유입되는 먼지의 농도를 감소시키기 위하여 전단에 원심력집진기를 설치하게 되므로 설치공간 및 동력비가 과다하게 소요되고 있으며, 높은 압력손실, 낮은 여과속도에 의한 장치면적 증가, 균일한 집진이 어려워 일부 여과포에 집중적인 부하가 걸리게 되는 단점 등을 가지고 있다. 전기집진장치의 경우 압력손실이 적고 대용량에 적용 가능하지만, 여과집진장치에 비해 집진효율이 낮고, 먼지의 종류 및 연료연소조건에 따라 집진효율이 크게 영향을 받는 단점을 가지고 있다. (중략)

• Journal of Korean Society of Environmental Engineers
• /
• v.39 no.6
• /
• pp.371-376
• /
• 2017

The effect of vortex finder confiqurations on the PM-10 collection efficiencies has been investigated using 7 different types of cyclones. Cyclone inlet velocities were calculated by computational fluid dynamics analysis and PM-10 collection efficiencies were measured from experimental apparatus. The inlet velocities of normal, P and A type cyclones were calculated 15.48 m/sec, 16.03 m/sec and 15.9 m/sec, respectively while experimental results show that PM-10 collection efficiencies were increased 4% for P type and 7% for A type cyclones compared to normal cyclone. Also it was found that there exist optimum parallel head lengths for both P and A type cyclones to maximize the PM-10 collection efficiencies.

• Journal of Korean Society of Environmental Engineers
• /
• v.31 no.11
• /
• pp.1033-1040
• /
• 2009

One thing to note in cyclone operation and design is to minimize the pressure drop with the enhancement of the efficiency of dust collection. This can be facilitated by the detailed resolution of complex fluid flow occurring inside a cyclone. To this end, the main objective of this study was to obtain the detailed fluid dynamics by the development of a reliable computation method and thereby to figure out the physics of dust collection mechanism for more extreme environment caused by high temperature and pressure condition. First of all, the computer program developed was evaluated against experimental result. That is, the numerical calculation predicts well the data of experimental pressure drop as a function of flow rate for the elevated pressure and temperature condition employed in this study. The increase of pressure and temperature generally affects significantly the collection efficiency of fine particle but the effect of pressure and temperature appears contrary each other. Therefore, the decrease of collection efficiency caused by the high operating temperature mainly due to the decrease of gaseous density can be remedied by increase of operating pressure. After the evaluation of the program, a series of parametric investigations are performed in terms of major cyclone design or operating parameters such as tangential velocity and vortex finder diameter for dusts of a certain range of particle diameters, etc. As expected, tangential velocity plays the most important effect on the collection efficiency. And the efficiency was not affected significantly by the change of the length of vortex finder but the diameter of vortex finder plays an important role for the enhancement of collection efficiency.

• Journal of Energy Engineering
• /
• v.12 no.3
• /
• pp.207-215
• /
• 2003

An experimental study on the characteristics of collection efficiency for electrostatic precipitator under the action of acoustic energy in the gas stream was performed. In the experiment, the acoustic energy which has 2 kHz and 141 dB was applied to electrostatic precipitator inlet, and the test parameters were used in terms of the magnitude of gas velocity. From the results of experiment, the collection efficiency of ESP was increased due to acoustic energy, and this effect was much clearer at high velocity. This means that the acoustic energy can play an important role in the enlargement of specific collection area of the electrostatic precipitator.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.05b
• /
• pp.395-396
• /
• 2003

최근, 고효율 집진장치로 새롭게 부각되고 있는 hybrid 집진 시스템은 2가지 이상의 집진 메카니즘을 1기의 단일 시스템에 결합시킴으로써, 시스템의 고성능화와 장치의 규모 및 설치비를 줄일 수 있는 중요한 장점을 지니고 있다. 본 연구에서는 전기력, 원심력 및 impaction 메카니즘(시스템 내부에 임팩션 효과를 유발시키는 impaction porous plate의 설치)을 결합하여 99% 이상의 집진효율을 기대할 수 있는 hybrid 집진 시스템의 특성을 연구하였다. 이는 99%의 고효율을 유지하는 기존 여과집진장치의 문제점인 낮은 여과속도(즉, 장치의 대형화), filter의 유지ㆍ관리 및 탈진 공정에 의한 연속 조업의 어려움 등을 동시에 해결할 수 있는 집진 시스템으로 이에 대한 연구가 수행되면 기존 가장 광범위하게 사용되지만, 많은 문제점을 지니고 있는 여과집진기를 대체할 수 있는 새로운 개념의 집진 시스템이 개발될 수 있을 것으로 생각된다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.11a
• /
• pp.479-480
• /
• 2003

미세 입자의 포집효율을 향상시키고 집진필터의 수명을 연장시키기 위해 여과집진 장치에 전기집진 기술을 접목시켜 미세 입자의 제어 성능을 향상시키기 위한 다단계 집진장치에 대해 많은 연구가 진행되어 왔다(Hautanen, 1996). 그 가운데 전기장 내에서의 입자 응집을 이용한 미세입자의 제거는 전기집진기의 효율을 높이기 위한 방법의 하나로 제시되었고(Lehtinen, 1996), 교류 전기장 내에서의 입자들의 충돌로 인하여 미세입자의 크기가 성장하여 전기 집진 장치에서 미세입자의 제거효율이 상승한다는 연구결과가 발표되었다(Watanabe, 19950. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2002.04a
• /
• pp.297-298
• /
• 2002

전기집진기(ESP)는 보일러, 소각로등 많은 산업 공정에서 발생되는 입자상 물질을 제거하는데 일반적으로 사용되어 왔다. 가장 널리 쓰이는 ESP의 집진효율을 예측하기 위한 수식으로는 Deutsch-Anderson식으로 다음과 같다.(equation omitted) 여기서 η는 포집효율, Ac는 집진판의 표면적(surface area), Ve는 전기집진기 내 입자의 유효 이동속도(effective migration velocity), 그리고 Q는 단위면적을 통과하는 가스의 부피 유량이다. (중략)

• Journal of the Korean Institute of Telematics and Electronics T
• /
• v.35T no.2
• /
• pp.66-71
• /
• 1998

A compact ESP of two-stage type is widely used with positive corona discharge in working environment where the production of ozone is extreamly prohibited. Since there are few scientific reports on a compact ESP, we have investigated the fundamental characteristics of a two-stage ESP. A model two-stage ESP is made with simple structure in order to simplify theoretical analysis and the relative position of the ionizer and collector section can be changed. The experimental investigation revealed many interesting facts.: The electric field in the collector electrodes affects the corona discharge of the ionizer. The concentration of particles after collector remarkably varied in the region between the high voltage and grounded electrodes. The collection efficiency right behind the high voltage electrode is much greater than that behind the grounded one. The total collection efficiency, calculated by integrating the particle concentration in whole measuring region, is greater when the high voltage electrode of the collector is located behind the discharge electrode of ionizer. Thus, the relative position of the ionizer and collector electrodes affects the precipitation characteristics.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.22 no.12
• /
• pp.122-129
• /
• 2008

This paper gives the experimental results for the effective precipitation of particulated matter(PM) below 1[${\mu}m$] of diameter using the electrostatic precipitator, which is designed by ourselves. In order to improve the precipitation efficiency, the vertical and parallel magnetic field to the electric field is applied simultaneously by arranging ferrite magnets. When the parallel magnetic field is applied, the precipitation efficiency does not improve in comparison with non-magnets. However, when the vertical magnetic field is applied, it is improved about 5[%] more than the case of non-magnetized ferrite plate used. In addition, when the magnets are installed at the center of ground plate electrodes, the precipitation efficiency is ranged from 17 to 32[%] under the applied voltage of 5[kV]. It is similar to the case of the magnet arrangement at the front part of ground electrode. Also, the precipitation efficiency is more improved by arranging magnets as the inside part and zigzag on the electrodes. Especially, large particles of 0.7 and 1[${\mu}m$] is more easily captured by electrostatic precipitator. Consequently, it is convinced that the vertical magnetic field is more desirable than parallel magnetic field on the electric field for the effective treatment of particulated matter.

• Journal of Korean Society of Environmental Engineers
• /
• v.22 no.4
• /
• pp.639-650
• /
• 2000

The main object of this study was to investigate experimentally the characteristics of cyclone-bag filter with bottom inlet to decrease the high pressure drop which was one of main problems of fabric bag filter. The experiment was executed for the analysis of collection efficiency and pressure drop(specially, pressure drop of fabric filter) characteristics of the cyclone-bag filter in comparison with those of general fabric bag filter with various experimental parameters such as the inlet velocity, dust loading and variation of vortex region, etc. In the results, the tangential inlet type showed higher collection efficiency for submicron particles below $1{\mu}m$ in diameter than of center inlet, and over 99% for overall collection efficiency. For the inlet particle concentration $100mg/m^3$, pressure drop reduction ratios were shown as 15~38% with the inlet velocity in case of large bag, while 30~48% for small bag due to the increase of vortex region.