• Title/Summary/Keyword: Fuel combustion analysis

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NOx저감을 위한 연료희박 재연소 기법의 실험 및 수치적 연구 (Experimental and Numerical Investigation for NOx Reduction with Fuel Lean Reburning System)

  • 김학영;백승욱;손희;김세원
    • 한국연소학회지
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    • 제14권2호
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    • pp.18-25
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    • 2009
  • Fuel lean reburning method is very attractive way in comparison with conventional reburning method for reducing NOX. Meanwhile, the knowledge of the how flue gas re-circulated, temperature distribution and species concentration is crucial for the design and operation of an effective fuel lean reburning system. For this reason, numerical analysis of fuel lean reburning system is a very important and challenge task. In this work, the effect of fuel lean reburn system on NOX reduction has been experimentally and numerically conducted. Experimental study has been conducted with a 15kW lab scale furnace. Liquefied Petroleum Gas is used as main fuel and reburn fuel. To carry out numerical study, the finite-volume based commercial computational fluid dynamics (CFD) code FLUENT6.3 was used to simulate the reacting flow in a given laboratory furnace. Steady state, three dimensional analysis performed for turbulent reactive flow and radiative heat transfer in the furnace.

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촉매 연소를 열원으로 한 수증기-메탄개질반응 전산유체해석 (Numerical Analysis of Steam-methane Reforming Reaction for Hydrogen Generation using Catalytic Combustion)

  • 이정섭;이강훈;유상석;안국영;강상규
    • 한국수소및신에너지학회논문집
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    • 제24권2호
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    • pp.113-120
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    • 2013
  • A steam reformer is a chemical reactor to produce high purity hydrogen from fossil fuel. In the steam reformer, since endothermic steam reforming is heated by exothermic combustion of fossil fuel, the heat transfer between two reaction zones dominates conversion of fossil fuel to hydrogen. Steam Reforming is complex chemical reaction, mass and heat transfer due to the exothermic methane/air combustion reaction and the endothermic steam reforming reaction. Typically, a steam reformer employs burner to supply appropriate heat for endothermic steam reforming reaction which reduces system efficiency. In this study, the heat of steam reforming reaction is provided by anode-off gas combustion of stationary fuel cell. This paper presents a optimization of heat transfer effect and average temperature of cross-section using two-dimensional models of a coaxial cylindrical reactor, and analysis three-dimensional models of a coaxial cylindrical steam reformer with chemical reaction. Numerical analysis needs to dominant chemical reaction that are assumed as a Steam Reforming (SR) reaction, a Water-Gas Shift (WGS) reaction, and a Direct Steam Reforming(DSR) reaction. The major parameters of analysis are temperature, fuel conversion and heat flux in the coaxial reactor.

INFLUENCE OF INITIAL COMBUSTION IN SI ENGINE ON FOLLOWING COMBUSTION STAGE AND CYCLE-BY-CYCLE VARIATIONS IN COMBUSTION PROCESS

  • Lee, Kyung-Hwan;Kim, Kisung
    • International Journal of Automotive Technology
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    • 제2권1호
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    • pp.25-31
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    • 2001
  • It is necessary to understand the combustion process and cycle-by-cycle variation in combustion to improve the engine stability and consequently to improve the fuel economy and exhaust emissions. The pressure related parameters instead of mass fraction burned were compared for the effect of initial combustion pressures on the following combustion and the analysis of cycle-by-cycle variation in combustion for two pen injected SI engines. The correlation between IMEP and pressures at referenced crank angles showed almost the same trends for equivalence ratios, but the different mixture preparations indicated different tendency. The dependency of IMEP on pressure at the referenced crank angles increases as the mixture becomes leaner for both engines. The mixture distribution in the combustion chamber was varied with the coolant temperature and intake valve deactivation due to the evaporation of fuel and air motion. The correlation between pressure related parameters were also compared for the coolant temperatures and air motion.

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PSIC 모델을 이용한 액체로켓의 연소실내 분무유동 해석 (Analysis for Spray Flow Using PSIC Model in Combustion Chamber of Liquid Rocket Engine)

  • 정대권;노태성
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2006년도 제26회 춘계학술대회논문집
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    • pp.253-256
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    • 2006
  • 액체로켓의 연소실내 분무연소 현상을 해석하기 위해 비연소 반응의 연료와 산화제 액적의 분무유동을 해석하였다. 분무연소 모델로 DSF 모델과 Euler-Lagrange 방법을 사용하였다. 액적과 가스상 그리고 증발한 기체상의 커플효과는 PSIC 모델을 사용하여 계산하였으며 수치 해석 방법으로 SIMPLER 알고리즘과 QUICK Scheme을 사용하였다. 해석결과 연소실내 속도와 온도 분포를 알 수 있었고, 연료와 산화제의 몰분율 또한 알 수 있었다.

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분무충돌을 이용하는 디젤연소실 설계를 위한 충돌면 분석 (Analysis of Impingement Lands to Help Diesel Combustion Chamber Using Spray Impaction)

  • 박권하
    • 한국분무공학회지
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    • 제1권2호
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    • pp.24-32
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    • 1996
  • Most of the research of small engines to date focused on developing spark ignition engines occupied much parts. Recently the number of a small direct injection diesel engine applied in small cars has been increased and considered as a next generation power source for passenger cars because of its high efficiency. Therefore the combustion chamber becomes smaller and the fuel injection pressure goes higher, which makes fuel sprays impinged easily on the combustion chamber walls. When strong swirls are not induced, the fuel may not mix with air because of fuel deposition on the wall. As a positive way, the combustion chamber systems which is using spray wall impaction has been introduced and assessed by an experimental or a simulate manner. In these systems the raised lands are positioned in tile chamber for spray impaction in order to break up the fuel drops into much smaller and direct them into desirable direction. This study addresses to the effects of rho position and size of the raised land or glow plug to help the chamber design using spray wall impaction. The characteristics of the spray impinged on various lands are investigated and compared with each other. Then the chamber shapes are discussed with the characteristics and their proper position and size is proposed in any chamber volume.

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디젤엔진조건에서 DME분무의 연소특성 해석 (Parametric Study of DME Spray Combustion Characteristics in the Diesel-like Condition)

  • 배준경;강성모;김용모
    • 한국분무공학회지
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    • 제14권4호
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    • pp.163-170
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    • 2009
  • The present study has numerically investigates the vaporization, auto-ignition and combustion processes in the high-pressure and high-temperature conditions encountered in the diesel engine. In the present study, in order to understand the overall spray combustion characteristics of DME fuel as well as to identify the distinctive differences of DME combustion processes compared to conventional hydrocarbon liquid fuels, the sequence of the comparative analysis has been systematically made for DME and n-Heptane liquid fuels. Computations for DME fuel are made for two cases including constant fuel mass flow rate condition and fixed heat release rate. Based on numerical results, the discussions are made for the detailed combustion processes of DME and n-Heptane spray.

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Analysis of Combustion and Flame Propagation Characteristics of LPG and Gasoline Fuels by Laser Deflection Method

  • Lee, Ki-Hyung;Lee, Chang-Sik;Ryu, Jea-Duk;Park, Gyung-Min
    • Journal of Mechanical Science and Technology
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    • 제16권7호
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    • pp.935-941
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    • 2002
  • This work is to investigate the combustion characteristics and flame propagation of the LPG (liquified petroleum gas) and gasoline fuel. In order to characterize the combustion processes of the fuels, the flame propagation and combustion characteristics were investigated by using a constant volume combustion chamber The flame propagation of both LPG and gasoline fuels was investigated by the laser deflection method and the high-speed Schlieren photography. The result of laser deflection method show that the error of measured flame propagation speed by laser method is less than 5% compared with the result of high-speed camera. The flame propagation speed of the fuel is increased with the decrease of initial pressure and the increase of initial temperature in the constant volume chamber. The results also show that the equivalence ratio has a grate effect on the flame speed, combustion pressure and the combustion duration of the fuel-air mixture.

Emulsion(B.C유+폐수)연료의 연소효율에 관한 실험적 연구 (An Experimental Study on the Combustion Characteristics of Wastewater-Emulsion Fuel)

  • 정진도
    • 에너지공학
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    • 제12권4호
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    • pp.267-273
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    • 2003
  • Emulsion 연료는 연료절감과 오염방지특성에 의하여 많은 관심을 끌고 있다. 본 연구에서는 B-C유와 Emulsion 연료(B-C유와 폐수를 혼합하여 만든 연료)의 연소효율을 비교 분석하였다. 보일러의 양쪽에 R-Type Thermocouple과 광학온도계를 설치하였고, 연소가스배출구에 연소측정기를 설치하여 B-C유와 Emulsion 연료의 연소시 화염의 온도, 연소율 및 배기가스 농도를 측정 비교하였다. 이에 대한 실험 결과로서, 보일러 전$.$후반부의 화염온도는 B-C유의 화염온도보다 약 5$0^{\circ}C$ 낮았고, 이러한 온도차이의 원인은 Emulsion 연료의 폐수 속 수분 잠열로 인한 것으로 사료되어진다. 또한 Emulsion연료를 사용하였을 때 배출가스의 분석 결과는 오염물질의 같소 및 CO 농도 또한 매우 낮게 측정되어짐을 나타내고 있다. 3-C유와 Emulsion 연료의 연소 효율은 각각 85.5%와 84.8%이다.

산소분리기술을 사용한 연료전지/순산소연소 발전시스템 해석 (Analysis of Solid Oxide Fuel Cell/Oxy-fuel Combustion Power Generation System Using Oxygen Separation Technology)

  • 박성구;김동섭;손정락;이영덕
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 추계학술대회 논문집
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    • pp.51-54
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    • 2008
  • This study aims to devise and analyze a power generation system combining the solid oxide fuel cell and oxy-fuel combustion technology. The fuel cell operates at an elevated pressure, a constituting a SOFC/gas turbine hybrid system. Oxygen is extracted from the high pressure cathode exit gas using ion transport membrane technology and supplied to the oxy-fuel power system. The entire system generates much more power than the fuel cell only system due to increased fuel cell voltage and power addition from oxy-fuel system. More than one third of the power comes out of the oxy-fuel system. The system efficiency is also higher than that of the fuel cell only system. Recovering most of the generated carbon dioxide is major advantage of the system.

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음식물쓰레기로부터 제조한 분체연료의 연소에 의한 에너지회수 특성 (Energy recovery characteristics by combustion of pulverized fuel made from food waste)

  • 김상국;권효리
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2009년도 추계학술대회 논문집
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    • pp.329-330
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    • 2009
  • Food waste contains almost no heavy metals and high fuel ratio 0.14-0.17 that makes it a good candidate for solid fuel. Thermogravimetric analysis showed that volatile matter volatilizes at $200-400^{\circ}C$, and ignition temperature is $460^{\circ}C$. Combustion efficiency measured from energy balance before and after combustion was over 99%. Pulverized fuel made from food waste is a new and renewable energy which contribute to low carbon green economic growth.

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