• Title/Summary/Keyword: 연소 배출물

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Analysis of the Contribution of Biomass Burning Emissions in East Asia to the PM10 and Radiation Energy Budget in Korea (동아시아의 생체연소 배출물에 대한 한국의 미세먼지 기여도 및 복사 에너지 수지 분석)

  • Lee, Ji-Hee;Cho, Jae-Hee;Kim, Hak-Sung
    • Journal of the Korean earth science society
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    • v.43 no.2
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    • pp.265-282
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    • 2022
  • This study analyzes the impact of long-range transport of biomass burning emissions from northeastern China on the concentration of particulate matter of diameter less than 10 ㎛ (PM10) in Korea using the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem). Korea was impacted by anthropogenic emissions from eastern China, dust storms from northern China and Mongolia, and biomass burning emissions from northeast China between April 4-and 7, 2020. The contributions of long-range PM10 transport were calculated by separating biomass burning emissions from mixed air pollutants with anthropogenic emissions and dust storms using the zeroing-out method. Further, the radiation energy budget over land and sea around the Korean Peninsula was analyzed according to the distribution of biomass burning emissions. Based on the WRF-Chem simulation during April 5-6, 2020, the contribution of long-range transport of biomass burning emissions was calculated as 60% of the daily PM10 average in Korea. The net heat flux around the Korean Peninsula was in a negative phase due to the influence of the large-scale biomass burning emissions. However, the contribution of biomass burning emissions was analyzed to be <45% during April 7-8, 2020, when the anthropogenic emissions from eastern China were added to biomass burning emissions, and PM10 concentration increased compared with the concentration recorded during April 5-6, 2020 in Korea. Furthermore, the net heat flux around the Korean Peninsula increased to a positive phase with the decreasing influence of biomass burning emissions.

Effect of Engine Operating Conditions on Combustion and Exhaust Emission Characteristics of a Gasoline Direct Injection(GDI) Engine Fueled with Bio-ethanol (직접분사식 가솔린엔진에서 운전조건에 따른 바이오에탄올의 연소 및 배기배출물 특성)

  • Yoon, Seung Hyun;Park, Su Han
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.7
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    • pp.609-615
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    • 2015
  • In this study, the combustion and exhaust emission characteristics in a gasoline direct injection engine with variations of the bio-ethanol-gasoline blending ratio and the excess air factor were investigated. To investigate the effects of the excess air factor and the bio-ethanol blends with gasoline, combustion characteristics such as the in-cylinder combustion pressure, rate of heat release (ROHR), and the fuel consumption rate were analyzed. The reduction of exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), and nitrogen oxides ($NO_x$) were compared with those of gasoline fuel with various excess air factors. The results showed that the peak combustion pressure and ROHR of bio-ethanol blends were slightly higher and were increased as bio-ethanol blending ratio is increased. Brake specific fuel consumption increased for a higher bio-ethanol blending ratio. The exhaust emissions decreased as the bio-ethanol blending ratio increased under all experimental conditions. The exhaust emissions of bio-ethanol fuels were lower than those of gasoline.

Flow Distribution Analyses for the Energy and Environmental Plant (에너지환경 플랜트에서의 유량 분배 해석)

  • 김종현;이진욱;심성훈;김석준
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2002.05a
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    • pp.245-250
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    • 2002
  • 보일러의 압입송풍기 토출구로부터 나온 연소용 공기를 버너가 있는 장소로 이동시키기 위해 설치하는 풍도(air duct)는 보다 원활한 연소용 공기의 공급과 효율적인 운송을 통하여 연소로에서 배출되는 연소 배출물인 SOx, NOx 등이 최소가 될 수 있도록 연소운전조건을 개선하여 연소로 내부에서의 화염을 안정화시킴으로 고효율 보일러의 운전환경을 제공할 수 있기 때문에 설계 단계에서 충분한 연구가 필요하다고 보여진다.(중략)

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Experimental Study on Combustion Performances with Variations in Main Air-ratio and Dilution hole-pattern (주연소 영역 공기배분 및 희석공기공 배치에 따른 연소 성능 변화 연구)

  • Kim, Minkuk;Kim, Hanseok;Jung, Seungchai;Park, Heeho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.254-257
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    • 2017
  • As a part of the development of aircraft gas turbines, combustion performance tests have been conducted in the single combustor sector. The effects of change in the amount of air supplied to the main combustion zone to the performance of the combustor, such as a pollutant emission, a liner temperature distribution and an exit temperature patterns, were studied. Emissions of CO and NOx increased with the main air-ratio and exit temperature pattern was improved. When changing the pattern of the dilution holes, it was shown that the temperature patterns on the exit plane of the combustor and the surface of liner changed depending on the main flame structure and mixing with diluent air. These observations will be applied to combustor liner designs to improve combustor durability and emissions reduction performance.

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A Study on Effect of Recirculated Exhaust Gas upon Performance and Exhaust Emissions in a Power Plant Boiler with FGR System (FGR 시스템 동력 플랜트 보일러의 성능 및 배기 배출물에 미치는 재순환 배기의 영향에 관한 연구)

  • Bae, Myung-whan;Jung, Kwong-ho;Park, Sung-bum
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.4
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    • pp.263-273
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    • 2016
  • The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing $NO_x$ emissions. To activate the combustion, the OFA with 0 to 20% is supplied into the flame. When the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between $0^{\circ}$ and $90^{\circ}$, also, the combustion air supplied to burner is changed. It is found that the fuel consumption rate per evaporation rate did not show an obvious tendency to increase or decrease with rising the FGR rate, and $NO_x$ emissions at the same OFA damper opening are decreased, as FGR rates are elevated and boiler loads are dropped. While a trace amount of soot is emitted without regard to the operation conditions of boiler load, OFA damper opening and FGR rate, because soot emissions are eliminated by the electrostatic precipitator with a collecting efficiency of 86.7%.

Characteristics of canola biodiesel fuel blended with diesel on the combustion and exhaust gas emissions in a compression ignition diesel engine (압축착화 디젤기관의 연소 및 배기가스에 대한 카롤라 바이오디젤 혼합 연료의 특성)

  • Yoon, Sam Ki;Kim, Min Soo;Choi, Nag Jung
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.9
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    • pp.1081-1086
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    • 2014
  • An experimental study was performed in order to compare with the case of using pure diesel the characteristics of combustion pressure and exhaust emissions when the engine speed was changed in a CRDI 4-cylinder diesel engine using biodiesel( Canola oil) blended and pure diesel fuel. As a results, the combustion pressure was decreased with increasing biodiesel blended rate when engine speed was 1,000, 1,500, 2000(rpm). but the combustion pressure of the engine speed 2,500rpm was increased with increasing biodiesel blended rate. The emission results show, that CO was decreased with increasing biodiesel blended rate and engine speed. The emission of $CO_2$, NOx, were increased with increasing biodiesel blended rate and engine speed.

Comparison of Domestic and Overseas Allowable Standards Related to Emissions from Wood Pellet Combustion (목재펠릿 연소 배출물질과 관련한 국내외 허용기준 비교)

  • Yang, In;Han, Gyu-Seong
    • Journal of the Korean Wood Science and Technology
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    • v.46 no.5
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    • pp.553-564
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    • 2018
  • This article explains the types of emissions from wood combustion, how they are generated and the degree of harmful influence on the human body, and a comparison between domestic and overseas allowable standards regarding the safety of wood pellets, the allowable amount of emissions caused by combustion and so on was conducted.

Effects of Fuel Injection Timing on Exhaust Emissions Characteristics of Biodiesel Blend Oil in Diesel Engine (디젤기관에서 바이오디젤 혼합유의 배기배출물 특성에 미치는 연료분사시기의 영향)

  • Lim, Jae-Keun;Cho, Sang-Gon
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.5
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    • pp.603-608
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    • 2012
  • Recently we have a growing interest in environmental pollution and alternative energy. Diesel engine is generally used to produce the power on shore and sea. However, the combustion characteristics and exhaust emissions of the engine are changed on account of the wear of fuel system and the altered ambient condition of the combustion chamber by the increment of the engine operation hour. Therefore the combustion characteristics and exhaust emissions on the fuel injection timing were experimentally investigated to find out the optimum fuel injection timing in case of the about 20 years used diesel engine using biodiesel blend oil. The original fuel injection timing of the engine is BTDC $22^{\circ}$ CA. However, it is found that the optimum fuel injection as a result of analyzing the specific oil consumption and exhaust emissions of 20 years used the engine is BTDC $26^{\circ}$ CA.

A Numerical Analysis on Combustion Characteristics of the Gasoline Engine using Methanol Reformulated Fuels under WOT Condition (전부하 운전조건에서 메탄올 개질연료를 사용한 가솔린 엔진의 연소특성에 대한 수치해석)

  • Lee, Suk-Young;Jeon, Chung-Hwan
    • Journal of Energy Engineering
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    • v.20 no.2
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    • pp.163-169
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    • 2011
  • This research is to decide the possibility of using RM50(reformulated methanol fuel) without any modification of engine by the method of numerical analysis. Comparing the heat release rate, the difference among each fuel was decreased according to the increase of the engine speed, and the maximum heat release rate was higher in the order of RM50 and gasoline fuel. Also, this order corresponds to the order of burning speed. RM50 had the higher turbulent burning speed, and the curve of turbulent intensity was showed similar tendency to the curve of turbulent burning speed. RM50 had relatively high burning speed, short quenching length, high temperature in cylinder, so that it might increase NO emission, but owing to chemical reaction dynamics, it was decreased NO emission. Therefore, in order to predict the possibility of using RM50, it is needed to consider not only the temperature in cylinder by low heating value, but also combustion characteristics including burning speed.