Simultaneous Removal of Gas and Dust by Activated Carbon Coated Electrode

Kwang Soo Kim,Jung O Park,Ju Haeng Lee,Tae Hwan Jun,Il Ho Kim 대한환경공학회 2013 Environmental Engineering Research Vol.18 No.4

This study aimed to develop a new dust collecting system equipped with an activated carbon (A.C.) coated electrode. Before fabrication, pre-treatment of A.C. was performed to remove metal ions within the A.C. to enlarge its specific surface area. Then, pre-treated A.C., black carbon, polyvinyl acetate (PVAc), and methanol were mixed to make a gel compound, which was coated onto aluminum plates to fabricate electrodes. The optimal mixing ratio of A.C., black carbon, PVAc, and methanol was found to be 10 g: 2 g: 3 g: 20 mL. After fabrication, the electrodes were used in the batch-type experiment for NH₃ and H₂S removal. The reduction rates of the gases were high at the beginning and slowly reduced with time. Dust collection experiments were conducted in continuous flow, with various voltages applied. Compared to 5 kV, dust removal efficiency was 1.5 times higher when 10 kV was applied. Increasing the number of electrodes applied also increased the collecting efficiency. The correlation coefficient between actual collecting efficiency and trend line was higher than 99%. Consequently, the novel dust collection system equipped with A.C. coated electrode appears to be a promising substitute for existing dust-control devices.

고전압 전극 두께와 집진판 간격에 따른 전기집진기의 미세먼지 집진효율 및 오존발생 특성

이재인,우상희,김종범,이승복,배귀남,Lee, Jae-In,Woo, Sang-Hee,Kim, Jong Bum,Lee, Seung-Bok,Bae, Gwi-Nam 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.4

To optimize the shape of the electrostatic precipitator for the removal of particulate matter in subway environments, the wind-tunnel experiments were carried out to characterize collection efficiency and ozone emission rate. As a standardized parameter, power consumption divided by the square of flow velocity, was increased, the $PM_{10}$ collection efficiency increased. If the standardized parameter is higher than 1.0 due to high power consumption or low flow velocity, increase in thickness of electrodes from 1 to 2 mm, or increase in distance of collection plates from 5 to 10 cm did not change the $PM_{10}$ collection efficiency much. Increase in thickness of high-voltage electrodes, however, can cause decrease in $PM_{10}$ collection efficiency by 28% for low power consumption and high flow velocity. The ozone emission rate decreased as distance of collection plates became wider, because the ozone emission rate per unit channel was constant, and the number of collection channels decreased as the distance of collection plates increased. When the distance of collection plates was narrow, the ozone emission rate increased with the increase of the thickness of electrodes, but the difference was negligible when the distance of collection plates was wide. It was found that the electrostatic precipitator having a thin high-voltage electrodes and a narrow distance of collection plates is advantageous. However, to increase the thickness of high-voltage electrodes, or to increase the distance of collection plates is needed, it is necessary to increase the applied voltage or reduce the flow rate to compensate reduction of the collection efficiency.

이동 전극형 전기집진기의 집진특성에 관한 연구-I. 집진판 이동 속도의 영향-

김용진,하병길,정상현,문상철,유주식 대한설비공학회 2004 설비공학 논문집 Vol.16 No.10

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.

Determination of the lateral collection length of charge carriers for silver-nanowire-electrode-based Cu(In,Ga)Se₂ thin-film solar cells

Lee, Sangyeob,Jang, Jiseong,Cho, Kyung Soo,Oh, Yong-Jun,Hong, Ki-Ha,Song, Soomin,Kim, Kihwan,Eo, Young-Joo,Ho Yun, Jae,Gwak, Jihye,Chung, Choong-Heui Elsevier 2019 Solar energy Vol.180 No.-

<P><B>Abstract</B></P> <P>Silver nanowire (AgNW) electrodes have been employed in solar cells as transparent conducting electrodes (TCEs). When a AgNW electrode is used as a network-type TCE in solar cells, photogenerated charge carriers must laterally travel to reach AgNW networks. If the empty space of the network is larger than the lateral collection length of the charge carriers ( <SUB> L lc </SUB> ), a significant fraction of the charge carriers will be lost. Therefore, determination of <SUB> L lc </SUB> is essential for choosing and/or designing a suitable network for solar cells. Here, we develop a method to relate the lateral photocurrent measured from a specially designed pattern to the <SUB> L lc </SUB> value. We apply this method to Cu(In,Ga)Se<SUB>2</SUB> thin-film solar cells with AgNW TCEs. The <SUB> L lc </SUB> value was determined to be ≈ 26 μm in the CdS/CIGS/Mo structure under 1-sun illumination. The measured lateral collection length is much larger than the normal spacing between AgNWs, indicating a high lateral collection efficiency in AgNW TCE-based CIGS thin-film solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lateral collection length is important for network-electrode-based solar cells. </LI> <LI> A method to determine the lateral collection length is developed. </LI> <LI> The lateral collection length for Cu(In,Ga)Se<SUB>2</SUB> solar cells was 26 μm under 1-sun. </LI> <LI> The method can be aaplied to other solar cells with network-transparent-electrodes. </LI> </UL> </P>

도시철도 지하터널용 전기집진기 개발을 위한 집진극 형상에 대한 기초연구

구태용,김용민,홍정희,황정호 한국입자에어로졸학회 2013 Particle and Aerosol Research Vol.9 No.2

In this study, the characteristics of turbulent flow and collection efficiency for an one-stage electrostatic precipitator(ESP) with slit type collecting electrode for urban railway underground tunnels were obtained using computational fluid dynamics(CFD) commercial code FLUENT 6.3 and lab-scale experiments. The electrostatic precipitator was operated under high gas velocity(3~12m/s). Five different designs of collecting electrode, flat plate-type and a slit-type of 3mm, 5mm, 7mm and 10mm slit width and four various gas velocity(3, 6, 9, and 12m/s) were used and applied. A standard k-ℇ model in CFD commercial code FLUENT 6.3 was used for flow simulation. The flow simulation results showed that the turbulent intensity of flat plate-type was higher than slit-type under all gas velocity conditions and also the turbulent intensity of flat plate-type was increased continuously, but in case of slit-type was maintained at constant range. And, the turbulent intensity was decreased according to increasing of slit width. The experimental results showed that the collection efficiency of slit-type was higher than flat plate-type under all gas velocity conditions. And, over 6m/s gas velocity condition, the collection efficiency of 5mm and 7mm was highest, when compared to 3mm and 10mm.

이동 전극형 전기집진기의 집진특성에 관한 연구-II. 펄스 하전 파형 및 분진농도의 영향-

김용진,하병길,정상현,홍원석,유주식 대한설비공학회 2004 설비공학 논문집 Vol.16 No.10

This study investigates the effect of the wave form of pulse energization and dust concentration on the collection characteristics of a moving electrode electrostatic precipitator (MEEP). Under the same specific corona power, the collection efficiency of the MEEP for the lower dust concentration (2 g/m3) becomes higher than that for the higher concentration (10 g/m3). Both the collection efficiency and specific corona power increase with increasing pulse period for the same value of applied voltage. The collection efficiency of MEEP is higher than that of the conventional fixed plate electrode electrostatic precipitator.

Use of an electrostatic precipitator with wet-porous electrode arrays for removal of air pollution at a precision manufacturing facility

Son, C.,Lee, W.,Jung, D.,Lee, D.,Byon, C.,Kim, W. Pergamon Press 2016 Journal of aerosol science Vol.100 No.-

<P>This study analyzed the concentrations and size distributions of ultrafine particles, as well as their chemical components and morphologies, in the context of manufacturing processes, focusing on injection molding and tool repair. The concentrations of water-soluble gases such as sulfur dioxide (SO2), which is an undesirable emission, were measured during the manufacturing process. To remove particles and gaseous pollutants from manufacturing sites simultaneously, we improved the recently introduced electrostatic precipitator (ESP) system, in which wet-porous electrodes (WPEs) are used. The modified novel ESP consisted of an ionization part, for particle charging, and a collection part, installed in the working chamber of a manufacturing facility along with the WPE array to maintain a high-humidity environment using a water bucket. The proposed ESP could be also be coupled with laminar flow modules that are typically mounted in manufacturing facilities and used to maintain a clean environment during working processes. To evaluate the performance of the proposed ESP, the removal efficiencies of airborne particles and SO2 gas were investigated under operating conditions, with an applied electric field strength in the collection part of the ESP and flow velocities in the working chamber. The collection efficiency of the WPE-ESP was improved by increasing the electric field strength of the collection plates, and the maximum total collection efficiency of the system was similar to 99.5% for a 13.3 kV/cm collection environment under 0.4 m/s conditions. The proposed system also removed SO2 at 88.5-92.5% under flow conditions of 0.4-2.0 m/s. Furthermore, this system shows potential for increasing energy efficiency in workplaces due to the extremely low pressure drop. (C) 2016 Elsevier Ltd. All rights reserved.</P>

황산 MIST 제거를 위한 전기집진기의 방전극 비교에 관한 연구

최영호,서정민 진주산업대학교 환경문제연구소 1998 環境硏究論文集 Vol.1 No.-

Electrostatic precipitator (EP) is one of the leading and most versatile methods of achieving high-efficiency collection of dusts, fumes, and mists. A number of researches have been conducted to solve performance and reliability problems of EP. The study was carried out to evaluate characteristics of discharge electrode, to measure collection efficiency varied with the applied voltage, to get an optimum current. therefore, this system was used ribbon and ribbon edge type in order to investigate the extents of So_x mist removal rates. The results were summarized as follows: The transformer-rectifier which supplies the power for the electric field was obtained Optimal voltage and current of 75kV, 400mA. In case of ribbon type was indicated low collection efficiency of 25 percent as a results of spark trouble at the range of 100mA, On the other hand, in case of ribbon edge type was indicated high SO_x mist removal efficiency of 90∼95 percent when operated at 75kV, 400mA.

조직 표면에서의 베타선 흡수선량 측정

하석호,김정묵,육종철 대한방사선 방어학회 1991 방사선방어학회지 Vol.16 No.2

외삽형 전리함을 사용하여 90Sr+90Y(1.65mCi) 베타선원에 대해 교정점 30cm 거리에서 조직표면의 흡수선량을 측정하였다. 이때 흡수선량 측정에 영향을 주는 유효단면적, 입사창 감쇠율, 극성효과, 이온 재결합율 등의 보정인자를 분석하였다. 이들 인자를 보정한 후의 조직표면의 흡수선량은 1.4939μGy/sec(±2.9%)로 평가되었다. Beta ray(90Sr+90Y) absorbed dose at tissue surface was measured from the distance of 30cm by use of extrapolation chamber. In the measurement, following factors were considered : effective area of collecting electrode, polarity effect, ion recombination and window attenuation. The measured absorbed dose rate at tissue surface was 1.4939μGy/sec with ±2.9%.

활성탄으로 코팅된 집진전극의 BTEX 흡착특성

남상철(Sangchul Nam),김현정(Hyun Jung Kim),김광수(Kwang Soo Kim) 한국대기환경학회 2013 한국대기환경학회지 Vol.29 No.6