• Title/Summary/Keyword: Combustion system

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Effects on Exhaust Gas Emission in Combined EGR System of Gas Engine and Diesel Engine (가스엔진과 디젤엔진의 혼합 EGR시스템이 배기배출물에 미치는 영향)

  • Yoo, Dong-Hoon;Nishida, Osami;Lim, Jae-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.6
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    • pp.896-902
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    • 2009
  • EGR is applied in order to lower temperature of combustion chamber by using the specific heat of carbon dioxide in engine exhaust gas. However, the problem of EGR system in diesel engine is high PM concentration. Combined EGR system can be reduced it by mixing exhaust gas of gas engine into the intake air of diesel engine. This experimental study was designed for EGR system for both engines use. The results of EGR experimental study by using diesel engine and gas engine are as follows. 1) The pressure of combustion and rate of heat release decreased. 2) The specific fuel consumption increased. But, up to middle load, it little increased. 3) NO concentration has decreased up to 50% in almost all combustion area. 4) The variation of the PM concentration at low load is not so seen. But at high load, PM increased rapidly when concentration of oxygen is decreased and most of it caused the increasing of Dry Soot.

Research and Development Trend of Gas Turbine Combustor in Korea (한국의 가스터빈엔진 연소기 연구개발 동향)

  • Choi, Seongman
    • 한국연소학회:학술대회논문집
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    • 2012.11a
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    • pp.287-289
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    • 2012
  • The research and development history of the gas turbine combustor in Korea is introduced briefly. It is very important to understand the fuel spray, mixing phenomena in achieving combustion performance. In this paper, two kinds of fuel injection system such as duplex fuel injector and rotary spray system are introduced in developing gas turbine combustor in Korea. The extensive experimental research of fuel spray, ignition, performance and endurance rig test makes gas turbine combustor successfully in Korea.

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An Analysis of the Demand Expansion Options for the Domestic Anthracite Coal (국내 무연탄의 수요개발 가능성 분석)

  • 최기련;강희정
    • Journal of Energy Engineering
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    • v.1 no.1
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    • pp.102-110
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    • 1992
  • The determination of production level of the domestic anthracite coal is an important issue in the national energy strategy. It is also closely related to the energy mix scenarios in the future. The objective of the paper is to discuss and analyze the options of expanding anthracite coal demand in the utility sector. The observed options are including; (1) New pulverized system of the 200 and 500 MW level, (2) Atmospheric Fluidized Bed Combustion (AFBC), and (3) Pressurized Fluidized Bed Combustion (PFBC). Special emphasis is placed on the considerations in estimating the effects on the electric system costs and government subsidies when the options are introduced in the utility sector.

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Introduction to Thermoacoustic Models for Combustion Instability Prediction Using Flame Transfer Function (화염 전달 함수를 이용한 열음향 연소 불안정 해석 모델 소개)

  • Kim, Dae-Sik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.6
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    • pp.98-106
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    • 2011
  • This paper reviews the state-of-the-art thermoacoustic(TA) modeling techniques and research trend to predict major parameters determining combustion instabilities in lean premixed gas turbine combustors. Linear TA modeling results give us an information on eigenfrequencies and initial growth rate of the instabilities. For the prediction, linear relation equation between acoustic waves and heat release oscillations should be derived in the determined system. Key information for this analysis is to determine the heat release fluctuations in the combustor, which is typically obtained by using n-${\tau}$ function from flame transfer function measurements and/or predictions. Great advancement in the linear TA modeling has been made over a couple of decades, and some successful prediction results have been reported in actual gas turbine combustors. However nonlinear TA model developments which are required to analyze nonlinear system behaviors such as limit cycle saturation and transition phenomena are still limited in a very simple system. In order to fully understand combustion instabilities in a complicated real system, nonlinear flame dynamics and acoustic wave interaction with nonlinear system boundary conditions should be explained from the nonlinear TA model developments.

An Experimental Study on the Measurement of Instantaneous Surface Temperature and Heat Flux on the Cylinder Head Surface of DI Diesel Engine (DI 디젤기관 실린더 헤드표면의 순간온도 및 열유속 측정에 관한 실험적 연구)

  • 이재순;김기태;이현구;강태경;우종헌;김수성
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.178-187
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    • 1997
  • For the experimental measurement of heat flux of DI diesel engine combustion chamber, the instantaneous temperature probes and data acquisition system were developed. By the analysis of measured temperatures at the cylinder head, the temperature at the point 3 which is located between intake and exhaust valve was higher than that of the other points. Temperatures at the point located mear the exhaust valve were higher than those of intake valve. The instantaneous and mean temperature at the cylinder head increases proportionally to the increase of the engine speed, while the temperature swing varies inversely. Temperature swings have influence on the maximum heat flux values from gas into head surface. It has been verified that these probes and data acquisition system perform well by the comparison of the trend of instantaneous temperature variation with that of measured combustion chamber pressure variation with respect to crank angle. It is presumed that these probes could be used in the measurement of other parts of combustion chamber as piston, cylinder wall etc. for the future study.

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An Experimental Study of Petroleum Cokes Air Staged Burner (공기다단 적용 석유코크스 연료 전용 연소기에 대한 실험적 연구)

  • Kwon, Minjun;Lee, Changyeop;Kim, Sewon
    • Journal of the Korean Society of Combustion
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    • v.20 no.2
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    • pp.40-45
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    • 2015
  • This study is aimed to study combustion characteristics of low $NO_X$ burner using petroleum cokes as fuel. The petroleum coke, which is produced through the oil refining process, is an attractive fuel in terms of its high heating value and relatively low price. But petroleum coke is a challenging fuel because of its low volatile content, high sulfur and nitrogen content, which give rise to undesirable emission characteristics and low ignitability. The petroleum cokes burner is operated at fuel rich condition, and overfire air are supplied to achieve fuel lean condition. The low $NO_X$ burner is designed to control fuel and air mixing to achieve air staged combustion, in addition secondary and tertiary air are supplied through swirler. Air distribution ratio of triple staged air are optimized experimentally. The result showed that $NO_X$ concentration is lowest when overfire air is used, and the burner function at a fuel rich condition.

Performance Evaluation on the Addition of Low-pressure Loop EGR in a Commercial Diesel Engine (상용 디젤엔진의 저압 순환 EGR 추가에 대한 성능 평가)

  • Wang, Tae-Joong;Lee, Jong-Yoon;Shim, Eui-Joon;Kim, Duk-Sang;Lee, Dong-In
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.2
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    • pp.105-110
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    • 2011
  • Through this study, the performance evaluation on the addition of low-pressure loop EGR(Exhaust Gas Recirculation) in a 6.0 L commercial diesel engine was carried out using WAVE modeling and simulation. Since the key technology of advanced diesel engine combustion such as low-temperature combustion is to steadily supply high rates of EGR in a wide operating range, the current study could be effectively contribute to the design and development processes of up-to-date diesel engine systems as real-world reference data. The current simulation results show that the system in which low-pressure loop EGR is added shows almost 2.3 times increase in maximum EGR rate at 1000 rpm as well as almost 1.6 times increase at 2200 and 1600 rpm in comparison with an engine system employing high-pressure loop EGR only. Also, both turbocharger axis speed and charging pressure level did not deteriorate due to the addition of low-pressure loop EGR at 2200 and 1000 rpm, but they were fairly decreased at 1600 rpm.

An Experimental Study on Diesel Spray Dynamics and Auto-Ignition Characteristics to use Rapid Comperssion Machine (RCM을 이용한 디젤 분무 거동 및 자발화 특성에 관한 실험적 연구)

  • Ahn, J.H.;Kim, H.M.;Shin, M.C.;Kim, S.W.
    • Journal of ILASS-Korea
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    • v.8 no.3
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    • pp.33-40
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    • 2003
  • The low-emission and high-performance diesel combustion is an important issue in the combustion research community, In order to understand the detailed diesel flame involving the complex physical processes, it is quite desirable to diesel spray dynamics, auto-ignition and spray flame propagation. Dynamics of fuel spray is a crucial element for air-fuel mixture formation, flame stabilization and pollutant formation, In the present study, the diesel RCM (Rapid Compression Machine) and the Electric Control injection system have been designed and developed to investigate the effects of injection pressure, injection timing, and intake air temperature on spray dynamics and diesel combustion processes, In terms of the macroscopic spray combustion characteristics, it is observed that the fuel jet atomization and the droplet breakup processes become much faster by increasing the injection pressure and the spray angle, With increasing the cylinder pressure, there is a tendency that the of spray pattern in the downstream region tends to be spherical due to the increase of air density and the corresponding drag force, Effects of intake temperature and injection pressure on auto-ignition is experimently analysed and discussed in detail.

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Solid Waste from Swine Wastewater as a Fuel Source for Heat Production

  • Park, Myung-Ho;Kumar, Sanjay;Ra, ChangSix
    • Asian-Australasian Journal of Animal Sciences
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    • v.25 no.11
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    • pp.1627-1633
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    • 2012
  • This study was to evaluate the feasibility of recycling the solids separated from swine wastewater treatment process as a fuel source for heat production and to provide a data set on the gas emissions and combustion properties. Also, in this study, the heavy metals in ash content were analyzed for its possible use as a fertilizer. Proximate analysis of the solid recovered from the swine wastewater after flocculation with organic polymer showed high calorific (5,330.50 kcal/kg) and low moisture (15.38%) content, indicating that the solid separated from swine wastewater can be used as an alternative fuel source. CO and NOx emissions were found to increase with increasing temperature. Combustion efficiency of the solids was found to be stable (95 to 98%) with varied temperatures. Thermogravimetry (TG) and differential thermal analysis (DTA) showed five thermal effects (four exothermic and one endothermic), and these effects were distinguished in three stages, water evaporation, heterogeneous combustion of hydrocarbons and decomposition reaction. Based on the calorific value and combustion stability results, solid separated from swine manure can be used as an alternative source of fuel, however further research is still warranted regarding regulation of CO and NOx emissions. Furthermore, the heavy metal content in ash was below the legal limits required for its usage as fertilizer.