전기집진기 예지보전 단계에서의 고장모드영향분석

한승훈,이정욱,이선엽,황종덕,강대곤 해양환경안전학회 2020 해양환경안전학회지 Vol.26 No.6

Currently, 90% of the world's population breathes air with a fine dust content exceeding the World Health Organization's annual average exposure limit (10㎍/㎥). Global efforts have been devoted toward reducing secondary pollutants and ultra-fine dust through regulations on nitrogen oxides released over land and sea. Domestic efforts have also aimed at creating clean marine environments by reducing sulfur emissions, which are the primary cause of dust accumulation in ships, through developing and distributing environment-friendly ships. Among the technologies for reducing harmful emissions from diesel engines, electrostatic precipitator offer several advantages such as a low pressure loss, high dust collection efficiency, and NOx removal and maintenance. This study aims to increase the durability of a ship by improving equipment quality through failure mode effects analysis for the preventive maintenance of an electrostatic precipitator that was developed for reducing fine dust particles emitted from the 2,427kW marine diesel engines in ships with a gross tonnage of 999 tons. With regard to risk priority, failure mode 241 (poor dust capture efficiency) was the highest, with an RPN of 180. It was necessary to determine the high-risk failure mode in the collecting electrode and manage it intensively. This was caused by clearance defects, owing to vibrations and consequent pin loosening. Given that pin loosening is mainly caused by vibrations generated in the hull or equipment, it is necessary to manage the position of pin loosening. 전 세계 90%의 인구가 WHO의 연평균 미세먼지 노출 기준(10㎍/㎥)을 초과한 공기를 흡입하고 있다. 전 세계적으로 육상뿐만 아니라 해양에서 발생하는 질소산화물에 대한 규제를 통해 2차 오염물질, 초미세먼지 저감에 대해 노력하고 있으며 국내에서는 선박에서 미세먼지 발생의 주요한 원인인 황 함유량 저감과 환경친화적 선박의 개발 및 보급 등을 통해 깨끗한 해양환경 조성을 위한 노력을 하고 있다. 디젤엔진 유해 배출가스 저감을 위한 기술 중 압력 손실이 적고 높은 집진 효율 및 NOx의 제거와 유지 관리의 장점이 많은 전기 집진기의 수요와 중요성이 증가하고 있다. 본 연구는 총톤수 999톤급 선박의 2,427kW 선박용 디젤엔진의 미세먼지 저감을 목적으로 개발된 전기 집진기를 예지보전단계에서 고장모드영향분석을 통해 장비 품질을 높여 선박 내에서의 내구연한을 높이고자 위험 우선순위 도출하였다. 위험 우선순위는 고장모드 241(poor dust capture efficiency)이 RPN 180으로 가장 높았다. Collecting electrode에서 가장 많은 고위험 고장모드를 검출하여 집중관리 부품으로 관리해야 할 필요가 있었으며 원인으로 진동과 핀 풀림으로 인한 유격 불량이 가장 많이 검출되었다. 핀 풀림 역시 근본적으로는 선체 또는 장비에서 발생하는 진동이 원인이 되어 발생할 수 있는 사항이기 때문에 핀 풀림이 발생하는 개소에 보완이 필요하겠다.

전기집진기 Layout 설계를 위한 소프트웨어 개발

조현덕,윤문철,박기서 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1

Electrostatic precipitator is the equipment that separates dust particles from the gas in which they are suspended. Specially, for the construction of industrial electrostatic precipitator, the corporations would send the layout design to a customer to accept an order. Therefore, it is mae a detail drawing after accept ance. Since the layout design of electrostatic precipitator is very complex, it takes time and design errors are included. Thus, for competitiveness in these industries, the development of software for the layout design of electrostatic precipitator is important. In this study, the developed software deals with technical concept and layout design of industrial electrostatic precipitator. By using the software, design time was very short, design errors reduced largely, and the standardization of design could be carried out.

전기 집진기의 유동 균일도 향상을 위한 챔버 설계에 관한 연구

방일호,김학민,염정국 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.10

In this study, we designed an electrostatic precipitator to reduce particulate matter emissions from a marine diesel engine. We determined the optimal collecting plate spacing inside the electrostatic precipitator and evaluated its performance through experiments. We also used numerical analysis to identify the flow uniformity inside the electrostatic precipitator that was difficult to confirm through experiments. We analyzed the electric current and voltage according to the distance of the collecting plate to select the optimal plate gap and confirm the dust collection efficiency. We calculated the flow uniformity of the electrostatic precipitator by checking the internal flow velocity through numerical analysis and evaluated the structural safety by examining stress and deformation. The study results showed that the electrostatic precipitator was stable with a collecting plate spacing of 15 mm and a dust collection efficiency of 80% or more. We also observed a flow uniformity of more than 92% through numerical analysis and confirmed the structural safety of the precipitator.

나선 스파이크 전기집진기 내 유동 및 집진 현상에 대한 전기수력학 수치해석 연구

이상혁(Sang Hyuk Lee),허남건(Nahmkeon Hur) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.4

In the present study, a numerical analysis on electro hydrodynamics (EHD) of the flow and the collection mechanisms inside a electrostatic precipitator with a spiral spike electrode were investigated. The phenomena of the electrostatic precipitator include complex interactions between the electric field, the fluid flow and the particle motion. To validate the numerical method, the numerical computation for the electric field of a simple wire-pipe type electrostatic system having an analytic solution were performed. Using this numerical method, the electric field of the spiked electrostatic precipitator was simulated. And the fluid flow and the particle motion inside the spiked electrostatic precipitator were numerically analyzed.

전기집진기 설계 전용 CAD 시스템 개발에 관한 연구

趙顯德 경일대학교 산업기술연구소 1995 産業技術硏究所 論文集 Vol.5 No.-

Electrostatic precipitator is the equipment that separates dust particles from the gas in which they are suspended. Specially, for the construction of industrial electrostatic precipitator the corporations would send the technical papers to a customer to accept an order. And, it is made a detail drawing after accept an order. Since the basic techni cal design of electrostatic precipitator is very complex it takes long time and includes design errors. Thus, for competitiveness in these industries, the development of software for technical and concept design is important. In this study, the software is called 'KOCO', and deals with a basic technical and concept design of industrial electrostatic precipitator. By using the software, design time was very short, design errors reduced largely, and the standardization of design could be carried out.

유전체 분리판이 추가된 2단식 와이어-평판 전기 집진기의 유전체 분리판 형상에 따른 입자 포집 특성에 관한 수치적 연구

박재현,김세현,최호연,하만영 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.4

In this paper, the ultrafine particle collection characteristics according to the shape of the dielectric separator and air inlet velocity were studied numerically in the two-stage electrostatic precipitator with dielectric plate. The electrostatic characteristics and particle motion of the electrostatic precipitator were implemented by UDF (user defined function) of a commercial software. The Lawless charging model was used to represent the charging characteristics of particles due to the corona discharge around the high voltage wire. The effects of air inlet velocity and the height of the dielectric plate on the collection efficiency were investigated. The collection efficiency decreased with increasing air flow rate and depended on the shape of the dielectric plate. 본 연구에서는 유전체 분리판이 추가된 2단식 와이어-평판 전기 집진기의 유전체 분리판의 형상 및 입구 공기 유속에 따른 초미세입자 포집 특성을 수치적으로 규명하는 연구를 수행하였다. 전기 집진기의 정전기적 특성과 입자 거동은 상용 소프트웨어의 UDF(user defined function)를 사용하여 구현하였다. Lawless 대전 모델을 사용하여 고전압을 인가한 와이어에서 발생하는 코로나 방전 현상으로 인한 입자의 대전 현상이 구현되었다. 입구 공기 유속 및 유전체 분리판의 높이가 집진 효율에 미치는 영향을 수치적으로 조사하였다. 집진 효율은 유속이 증가함에 따라 감소하였고, 유전체 분리판 형상에 많은 영향을 받으면서 변하였다.

전기집진기 내 유동 및 집진 현상에 대한 전기수력학 수치해석 연구

이상혁(Sang Hyuk Lee),허남건(Nahmkeon Hur) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-

In the present study, a numerical analysis on electrohydrodynamics (EHD) of the flow and the collection mechanism inside a electrostatic precipitator were investigated. The phenomena of the electrostatic precipitator include complex interactions between the electric field, the fluid flow and the particle motion. To validate the numerical method, the numerical computation for the electric field of a simple wire-pipe type electrostatic system having an analytic solution were performed. Using this numerical method, the electric field of the spiked electrostatic precipitator was simulated. And the fluid flow and the particle motion inside the spiked electrostatic precipitator were numerically analyzed.

전기 집진기의 진동 탈진용 공진형 전자기 진동 가진기를 적용한 집진판의 진동 특성 해석 및 가속도 측정

김제훈(Je-Hoon Kim),김진호(Jin-Ho Kim),정상현(Sang-Hyun Jeong),한방우(Bang-Woo Han) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

The miniaturization of electrostatic precipitator is becoming a key element to the success of the efficient electrostatic precipitator due to the limited space allowed to install electrostatic precipitator in subway tunnel. Therefore, the miniaturization of rapping system in electrostatic precipitator is also important. This research proposes a resonant-type electromagnetic vibration exciter for vibrating rapper of electrostatic precipitator. Collected dust is removed by a compact size of vibrating rapper from collecting plates, not by imposing direct impact to the dust collecting plates. Moreover, to analyze the acceleration when the number of collecting plates increased from one to four, we manufactured a prototype. Additionally, we analyzed a prototype of resonant frequency using ANSYS, and we measured the acceleration at the resonant frequency.

덕트타입 히트펌프 시스템에 적용된 습식 전기집진기 개발

우창규(Chang Gyu Woo),송찬호(Chan Ho Song),한방우(Bangwoo Han),김학준(Hak-Joon Kim),김용진(Yong-Jin Kim),김욱중(Ook-Joong Kim),윤석호(Seok Ho Yoon),손상호(Sang Ho Sohn) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

The present study has been conducted for the characteristics of wet electrostatic precipitator applied to duct type heat pump system. The wet electrostatic precipitator has been developed and tested under various conditions. The strength of wet electrostatic precipitator is its low pressure drop and particle absorption capability compared to mesh type mechanical filter system. The two characteristics – dust collecton efficiency and pressure drop - of wet electrostatic precipitator which is applied to duct type heat pump system was analyzed. Pressure drop in this system was very low compared with conventional mesh type system. Its dust collection efficiency was proportional to applied voltage to the ionizers and collection plates. It is expected that this wet electrostatic precipitator can be used to improve indoor air quality for high cleanliness.

자기공명유속계를 이용한 전기집진기 내부 유동의 실험적 분석

성정모,한규호,박한준,한종호,황원태 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.12

An electrostatic precipitator is an environmental pollution reduction facility, and its efficiency varies depending on the uniformity of flow. Owing to spatial limitations, curved pipes, rapid expansion, and contraction tubes are inevitable. Consequently, the flow becomes non-uniform, and the particle collection efficiency decreases. To prevent this problem, previous studies have been conducted to make the flow uniform by inserting guide vanes and perforated plates. However, the studies were conducted in simplified models by analyzing the flow with instruments that have limitations, such as a pitot tube, or using CFD only. In this study, the three-dimensional flow within the electrostatic precipitator was analyzed using magnetic resonance velocimetry. A recirculation zone near the guide vane and flow separation within the diffuser with perforated plates were observed. This demonstrates that if the guide vanes and perforated plates are not properly optimized, proper flow uniformity cannot be achieved. 전기집진기는 환경오염 저감 설비로 유동의 균일도에 따라 그 효율이 달라지는데, 공간적 한계로 곡관, 급격한 확대, 축소 관 등을 사용할 수밖에 없고 그로 인해 불균일한 유동이 흘러 집진효율이 감소한다. 이러한 문제를 막기 위해서 guide vane, 타공판 등을 삽입해 유동을 균일하게 만들려는 선행 연구들이 수행됐다. 그러나 대부분 단순화된 모델에서 pitot tube 같은 한계가 있는 기구로 유동을 분석하거나 전산유체역학만을 이용해 연구를 수행했다. 본 연구에서는 자기공명유속계를 이용해 전기집진기의 전체적인 형상을 고려한 3차원 유동을 분석했고, guide vane 영역에서 재순환 영역과 타공판이 삽입된 diffuser에서 유동 박리를 확인했다. 이는 guide vane과 타공판의 최적화된 설계가 진행되지 않으면 유동 균일화 역할을 제대로 수행하지 못함을 보여준다.