• Title/Summary/Keyword: Air clean system

Search Result 289, Processing Time 0.027 seconds

High-Efficiency Non-contact Power Supply System

  • Zheng, Bin;Kwan, Dae-Hwan;Lee, Dae-Sik
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • 2005.11a
    • /
    • pp.233-235
    • /
    • 2005
  • Non-contact power supply (NCPS), as a clean and safe energy supply concept has been applying wildly. Comparing with the conventional transformer the non-contact transformer has a large air gap between the long primary winding and the secondary winding. Due to it, the non-contact transformer has increased leakage inductance and reduced magnetizing inductance. So the high frequency series resonant converter has been widly used on the non-contact power supply system for transferring the primary power to the secondary one, from what a high influence voltage can be gained on the secondry coil even though the large air gap exists. However, it still has the disadvantages of the load sensitive voltage gain characteristics when load is changing. In this paper, we propose a fuzzy logic controller to adjust the frequency of the inverter to track the resonat which is changing when the load is change.

  • PDF

Enhancement of HF Gas Removal Efficiency of a Scrubber in Semiconductor Manufacturing Process by using ANCOVA Technique (ANCOVA를 이용한 반도체공정 스크러버 HF 가스 제거 개선)

  • Kim, S.J.;Lee, M.;Xu, J.;Lim, S.;Lee, H.;Koo, J.
    • Journal of ILASS-Korea
    • /
    • v.18 no.2
    • /
    • pp.81-86
    • /
    • 2013
  • To comply with the regulation of the reinforcing Clean Air Conservation Act, it is necessary for the semiconductor manufacturers to develop effective low-concentration acid gas abatement system to treat the flue gas. The low-concentration acid gas was found to be harder to deal with than the high-concentration one. In this study, the effect of various potential treatments such as air-assist nozzle spraying, magnetizing the scrubbing water, and adding surfactants to spraying and scrubbing water were investigate through the application of the statistical ANCOVA method, which was proved to be very useful tool when the inlet concentration of acid gas could not be controlled precisely and it affected the removal efficiency of the abatement system.

Korean National Emissions Inventory System and 2007 Air Pollutant Emissions

  • Lee, Dae-Gyun;Lee, Yong-Mi;Jang, Kee-Won;Yoo, Chul;Kang, Kyoung-Hee;Lee, Ju-Hyoung;Jung, Sung-Woon;Park, Jung-Min;Lee, Sang-Bo;Han, Jong-Soo;Hong, Ji-Hyung;Lee, Suk-Jo
    • Asian Journal of Atmospheric Environment
    • /
    • v.5 no.4
    • /
    • pp.278-291
    • /
    • 2011
  • Korea has experienced dramatic development and has become highly industrialized and urbanized during the past 40 years, which has resulted in rapid economic growth. Due to the industrialization and urbanization, however, air pollutant emission sources have increased substantially. Rapid increases in emission sources have caused Korea to suffer from serious air pollution. An air pollutant emissions inventory is one set of essential data to help policymakers understand the current status of air pollution levels, to establish air pollution control policies and to analyze the impacts of implementation of policies, as well as for air quality studies. To accurately and realistically estimate administrative district level air pollutant emissions of Korea, we developed a Korean Emissions Inventory System named the Clean Air Policy Support System (CAPSS). In CAPSS, emissions sources are classified into four levels. Emission factors for each classification category are collected from various domestic and international research reports, and the CAPSS utilizes various national, regional and local level statistical data, compiled by approximately 150 Korean organizations. In this paper, we introduced for the first time, a Korean national emissions inventory system and release Korea's official 2007 air pollutant emissions for five regulated air pollutants.

An Investigation of Citizen's Attitude on the Harmful Insects in House (주택에서의 유해생물에 대한 시민 인식도 조사)

  • 김영환;손종렬;문경환;변상훈
    • Journal of environmental and Sanitary engineering
    • /
    • v.17 no.1
    • /
    • pp.36-40
    • /
    • 2002
  • The purpose of study was to suggest an investigation of citizen's attitude on harmful insects in house. This study was consisted of four parts, such as basic investigation (housing shape, housing material, the period of house constructed, a cleaning condition), condition of kitchen, condition of living room condition of bathroom. The environmental pollution was increased by the development of industry and urbanization in modern. And also the clean of house has related with air quality such as pollutants and harmful insects etc. Because dwelling shape of urban come to be crowded, shut tightly and high buildings, the air quality of indoor was gradually polluted by several irregular cause. In one of housing pollution, the harmful insects was important any other than indoor air pollution. The problems of kitchen were the odor of food waste, discharge system of sewage and harmful insects. The important issues of living room were mold and construction materials, then important them of bathroom were easing nature and discharge system of sewage. A kind of the harmful insects in house investigated cockroach> mosquito> ant>fly. Finally, it appeared that the control of harmful insects can be applied to the improvement of indoor air pollutant which are difficult to be controlled in house.

Study on Operating Characteristics for NOx Reduction in Ultra Low NOx Burner Combustion Using 80 kW Furnace (80 kW 초 저 NOx 단일 버너 연소로에서 NOx 감소를 위한 운전특성 연구)

  • Chae, Taeyoung
    • Clean Technology
    • /
    • v.26 no.3
    • /
    • pp.211-220
    • /
    • 2020
  • This experimental study investigates the design parameters to achieve ultra low NOx combustion of coal using a 80 kW capacity single-burner furnace. The influence of key design parameters such as SN, overall and burner-zone equivalence ratios, primary/secondary air ratio, overfire air (OFA) ratio were tested for a total of 81 cases. The results showed that weak swirl intensity of the burner leads to higher NOx emission whereas strong swirl intensity accompanies increased CO concentration desipte lower NOx emission. Therefore, finding an appropirate swirl intensity is essential for the burner design. Larger flow rate of secondary air increased NOx emission, whereas smaller flow rate stretches the flame and increased CO emission. The lowest NOx emission of 82 ppm (6% O2) was achieved at the optimal condition of the present burner deisgn. It is expected to furrther lower the NOx emission by introducing splitting the burner secondary air into three or four streams.

Cooling Water Utility of Future Clean Energy Source KSTAR (미래 청정에너지원 KSTAR의 냉각수설비)

  • Lee, J.M.;Kim, Y.J.;Park, D.S.;Lim, D.S.
    • Proceedings of the SAREK Conference
    • /
    • 2006.06a
    • /
    • pp.596-601
    • /
    • 2006
  • Because of insufficiency of energy resources and pollution of environment, it is necessary to develop alternative energy sources. Nuclear fission energy is used widely for source of electric Power but being restricted due to radioactivity problem. Nuclear fission is highlighted as the new generation of nuclear energy and researched worldwide because of low risk of radiation effect. The representatives of fusion research is China's EAST, KSTAR of Korea and ITER of world. Korea Superconducting Tokamak Advanced Research(KSTAR) project is on progress for the completion in August, 2007. In this study, the research of utility system for KSTAR be carried out. The utility system of KSTAR is consist of water cooling & heating system, $N_2$ gas system, DI water system, service water system and instrument air & auto control system. The progress of KSTAR utility system is under commissioning state after construction completion. The optimal operation scenario will be verified during commissioning and adopted to the KSTAR operation.

  • PDF

Evaluation of Washing Efficiency of Collective PM by Electrostatic Precipitator in Subway Station Using Nano Bubble (나노버블을 이용한 지하철용 전기집진기 포집먼지에 대한 세척효율 평가)

  • Lee, Hyung-Don;Lee, Seung-Hwan;Park, Chan-gyu
    • Clean Technology
    • /
    • v.26 no.1
    • /
    • pp.13-21
    • /
    • 2020
  • Air pollutants in a subway are complexly caused by outdoor factors such as ventilating opening and indoor factors such as the movement of passengers on the subway. According to recent research results, most of the air pollutants generated in subway tunnels and stations are caused by indoor variables such as train movement. To control air pollutants such as particulate matter (PM), a prevention facility such as the electrostatic precipitator (EP) or bag filter collector was required in a subway station. In particular, the PM removed by the EP must be kept clean continuously to manage PM effectively. Therefore, a nano-bubbling washing system was developed in this study to clean a contaminated collecting plate in an EP at the main subway tunnel in Seoul. Removal efficiency compared with normal water and nano-bubbling water was likewise studied. As a result, the washing efficiency of collective PM increased in accordance with the increasing of injection pressure, with nano bubbling washing being 130.8% higher than tap water. According to increase in washing times, the maximum washing efficiency was 143.1% higher than tap water, but suitable washing times were less than 3 times. According to the results of the washing efficiency by variation of residence time, it was confirmed that the maximum residence time of nano-bubble water was maintained within 5 minutes.

Developement of Automatic Microanalysis System of Ammonia Gas in Clean Room by Using of Wet Denuder (디누더를 이용한 클린룸 내 미량 암모니아 가스 자동 측정 시스템 개발)

  • 이응선;김정수;김광영;유승교
    • Proceedings of the Korea Air Pollution Research Association Conference
    • /
    • 2000.11a
    • /
    • pp.101-102
    • /
    • 2000
  • 반도체 생산에서 암모니아는 정밀성을 요구하는 공정 특히, 광증폭 공정에서 산과 반응하여 불량을 일으키는 주 원인이며, 고메모리로 갈수록 청정도 기준이 엄격해져서 1 ppbv 이하의 농도를 검출할 수 있는 기술이 요구되고 있다. 현재 반도체 회사에서의 암모니아 분석은 임핀저를 이용하여 가스를 포집한 후 이온크로마토그래피로 분석 하고 있으나, 이는 많은 시간과 인력이 요구되며, 실시간 분석이 어렵기 때문에 반도체 클린룸의 관리에 어려움이 있다. (중략)

  • PDF

The Estimation of heat transfer effect of Bunker C-oil Combustion by emulsified water addition (기술사 마당 - C-중유와 물의 에멀젼 연료화 장치의 효율예측)

  • Mun, Sung Su
    • Journal of the Korean Professional Engineers Association
    • /
    • v.45 no.6
    • /
    • pp.54-57
    • /
    • 2012
  • Usually the combustion of Bunker-C oil limited in a special area and achieved certain clean air effect. Water added oil combustion has the ability enhance the effect by the Overall Heat Transfer Coefficient. Every water adding step dedicated to reach an increase of the heat transfer effect. So, we can use this system and achieve reasonable energy consumption.

  • PDF

A Case Study for Installation of Dry Washing Process in Kitchen (주방에서 건식 식기 세척기 설치 및 운전 사례연구)

  • Tateda, Masafumi;Kim, Youngchul
    • Journal of Korean Society on Water Environment
    • /
    • v.23 no.3
    • /
    • pp.391-396
    • /
    • 2007
  • Dry washing by air and sand to clean dishes was investigated for establishing a dry washing process in a kitchen. Thirty seasonings and foods as dirt markers and fourteen kinds of dishes were used for the experiment, and washing efficiency was evaluated by COD-MN (mg/L). It was found that air dry washing effectively reduced COD-MN of some dirt markers but not effective at all to some dirt markers. It could be also said that dirt markers would not be completely removed by air dry washing. The shape of dishes also affected COD-MN reduction by air dry washing. Sand dry washing showed excellent efficiency on COD-MN reduction. Combination of air and sand dry washing may be necessary to make a dish dry washing system which is completely independent from water.