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지하철 역사 내 초미세먼지 저감 장치 현황 분석 및 개발 연구
이예완,김예슬,이한얼,김용진,한방우,김학준 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
지하철 역사는 구조상 자연 환기가 어렵고, 지속적으로 다량의 철 성분을 포함한 철도 미세먼지가 유입되어 지속적인 실내 공기질 관리가 필요하다. 정부에서는 베타선 흡수법을 이용한 PM2.5 측정기기를 전국 모든 지하역사 승강장에 설치하고, 측정결과를 실내공기질 관리 종합정보망을 통해 공개하고 있다. 그러나, 측정 장소가 승강장에만 한정되어 있어 역사 내 공기질을 종합적으로 알기 힘들며, 베타선흡수법의 한계상 실시간 측정이 어렵다. 또한, 기존의 지하철 역사 적용 공조기 및 공기청정기 등 초미세먼지 저감 장치는 필터를 적용하여 주기적인 교체가 필요하여 재료비 및 인건비의 낭비를 초래한다. 본 연구는 저가형 초미세먼지 센서를 이용하여 공조기 및 공기청정기 등 지하철 역사 내 초미세먼지 저감장치의 현황을 분석하였다. 뿐만 아니라, 기존의 필터방식 공기청정기 및 공조기를 개선하여 무필터방식 정기집진 기술을 적용하여 실내 공기질 평가를 수행하였다. 또한, 본 연구는 역사 내 공기 입/출입을 분석하여 지하철 역사의 공기질을 예측할 수 있는 이론 모델을 제공한다.
기울어진 수조에 액적 충돌로 발생한 최대 공동 예측 모델
이예완(Yeawan Lee),김영도(Youngdo Kim),김형수(Hyoungsoo Kim) 한국가시화정보학회 2019 한국가시화정보학회지 Vol.17 No.2
In this study, we show the maximum cavity radius prediction model that a droplet impacts an inclined bath. Surface tensions, viscosities, inclination angles of a bottom substrate, droplet diameters, falling heights of the droplet are varied for the experiment. We experimentally observe that the cavity grows in hemispherical shape like the cavity formed in a deep bath although the depth of the bath is non-uniform due to an inclined bottom substrate. We derive two theoretical models to predict the experimental results of the fully developed cavity. Although each model has error, we observe that qualitatively theoretical model predicts the trend of experiment results well.
탄산칼슘 기반 요오드칼륨 흡수제를 활용한 습식스크러버 기반질소산화물 및 황산화물 동시 제거
이광택,이예완,김용진,한방우,김상복,박인용,이건희,박대훈,홍기정,김학준 한국에너지기후변화학회 2023 에너지기후변화학회지 Vol.18 No.1
Air pollution has been issued as a major environmental problem for decades. In particular, nitric oxides (NOx)and sulfur oxides (SOx), which are the main pollutants emitted from the various point and non-point sources, areregarded as the main target due to their detrimental effects on human health and the environment. The selective catalyticreduction and wet flue gas desulfurization, which are conventional unit processes, are associated with poor catalystdurability, high-temperature requirement, high investment, and plenty of wastewater production. In this study, therefore,NOx and SOx were simultaneously reduced by a unit wet scrubber system using a KI-based absorbent. NO was oxidizedby ozone to increase NOx solubility and optimal O3:NO was 1.7. The pilot-scale study demonstrated that although NOxremoval efficiency was 73% owing to the low conversion rate of NO to NO2, SOx removal efficiency was maintained at 99%. With the future development of optimal conditions, the cost-effective operation of a simultaneous wet scrubber systemis feasible.
지하철 공기질 개선을 위한 분리형 2단 전기집진기의 집진 특성 분석
김예슬,이예완,김용진,한방우,김학준,Kim, Ye-Sle,Lee, Yeawan,Kim, Yong-Jin,Han, Bangwoo,Kim, Hak-Joon 한국입자에어로졸학회 2020 Particle and Aerosol Research Vol.16 No.4
In this study, we developed a separated two-stage electrostatic precipitator applicable in a subway air conditioning system. We studied the characteristics of collection efficiency of 0.3 ㎛ particle and ozone generation at different charger sizes and gaps of collector plates. Also, we compared the performance of the two-stage ESP to the MERV 10 filter with the removal efficiency of 10% used in actual subway air conditioning system. The maximum collection efficiency of 0.3 ㎛ particle was 93% at A charger (600 mm×250 mm×600 mm) and 84% at B charger (330 mm×280 mm×330 mm). Especially, with voltages applied to chargers with collection efficiency of about 80% or more, the ozone concentration of two different chargers was 5 ppb to 35 ppb. Finally, the filter quality of the collector developed in this study was 400 times higher than that of the MERV 10 filter. Therefore, it was concluded that the two-stage ESP could be a promising PM removal device suitable for subway air conditioning system.
내부식성과 경량성 향상을 위한 비금속 재질 집진판의 2단 전기집진기 집진효율 연구
안소희,이예완,김예슬,김용진,한방우,김학준,An, So-Hee,Lee, Yeawan,Kim, Ye-Sle,Kim, Yong-Jin,Han, Bangwoo,Kim, Hak-Joon 한국입자에어로졸학회 2021 Particle and Aerosol Research Vol.17 No.2
We developed non-metallic electrodes that can replace metallic electrodes of the electrostatic precipitator(ESP) for the purpose of light weight, corrosion resistance, cost reduction. We manufactured three types of collection electrodes made of stainless steel (M), Carbon ink coating layer-Plastic sheet-Carbon ink coating layer (CPC), and Plastic sheet-Carbon ink coating layer-Plastic sheet (PCP). We studied the collection efficiency of a two-stage ESP using oil mist particles with and without collection stage by changing the flow rate, the material of collection electrode, and the applied voltage of the pre-charger module and the collection module. Here we measured concentrations of particles at diameters of 0.45 ㎛ (CMD; count median diameter) and 3.0 ㎛ (MMD : mass median diameter), as well as PM<sub>2.5</sub> and PM<sub>10</sub>. As a result of the experiment, two-stage ESP had 22~25% higher collection efficiency in PM<sub>2.5</sub> than one-stage ESP at the same applied voltage. The difference in collection efficiency by varying the materials of collection electrodes was less than 5%. The weight of the non-metallic electrode was only one eighth the weight of the metal electrode. CPC electrode had a thickness of 0.27 mm, which was 1.5 times thinner than a thickness of PCP electrode, so when the flow rate increased, the CPC electrodes couldn't be kept at equal intervals due to the fluttering unlike PCP electrodes. In addition, the PCP-CPC collection module of the present experiment followed the theoretical efficiency based on Deutsch equation and Cochet's charging theory.