• Title, Summary, Keyword: syngas

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An Experimental Study on Reductions of Idle Emissions with the Syngas Assist in an SI Engine (합성가스를 이용한 SI 엔진의 공회전 유해 배기가스 저감에 관한 실험적 연구)

  • Kim, Chang-Gi;Kang, Kern-Young;Song, Chun-Sub;Cho, Young-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.174-182
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    • 2007
  • Fuel reforming technology for the fuel cell vehicles could be applied to internal combustion engine for the reduction of engine out emissions. Since syngas which is reformed from fossil fuel has hydrogen as a major component, it has abilities to enhance the combustion characteristics with wide flammability and high speed flame propagation. In this study, syngas was added to a gasoline engine to improve combustion stability and exhaust emissions of idle state. Syngas fraction is varied to 0%, 50%, 100% with various ignition timing and excess air ratio. Combustion stability, exhaust emissions, fuel consumption and exhaust gas temperature were measured to investigate the effects of syngas addition on idle performance. Results showed that syngas has ability to widely extend lean operation limit and ignition retard range with dramatical reduction of engine out emissions.

Operation Characteristics of Gas Engine Generator System using Coal Syngas (석탄 합성가스를 사용한 가스엔진 발전시스템 운전 특성)

  • Chung, Seok-Woo;Kim, Mun-Hyun;Lee, Seung-Jong;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.800-803
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    • 2007
  • Gasification has been regarded as a core technology in dealing with environmental pollutants and in obtaining higher efficiency for power generation. Among several ways in utilizing produced syngas from gasification, power generation would be the most prominent application. Syngas from coal was applied to the readily available LPG engine from automobiles. Main purpose was to identify the combustion characteristics in the modified gas engine when using syngas of low heating value and to test the modification optionsin the LPG gas engine. Gas engine rpm and the corresponding flue gas composition were measured for each syngas input condition. Results showed that even with syngas at the heating value of $1300{\sim}1800$ kcal/$Nm^3$ corresponding to the $6{\sim}7%$ of LPG heating value, gas engine operated successfully only with the problems of high CO and oxygen concentrations in the flue gas.

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Syngas and Hydrogen Production from $CeO_2/ZrO_2$ coated Foam Devices under Simulated Solar Radiation (다공성 폼에 코팅된 $CeO_2/ZrO_2$ 를 이용한 고온 태양열 합성가스 및 수소 생산 연구)

  • Jang, Jong-Tak;Yoon, Ki-June;Han, Gui-Young
    • 한국태양에너지학회:학술대회논문집
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    • pp.260-266
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    • 2012
  • Syngas and hydrogen from the $CeO_2/ZrO_2$ coated foam devices were investigated under simulated solar radiation. The $CeO_2/ZrO_2$ coated SiC, Ni and Cu foam device were prepared using drop-coating method. Syngas production step was performed at $900^{\circ}C$, and hydrogen production process was performed for ten repeated cycles to compare the CeO2 conversion in syngas production step, $H_2$ yield in hydrogen production step and cycle reproducibility. The produced syngas had the $H_2$/CO ratio of 2, which was suitable for methanol synthesis or Fischer-Tropsch synthesis process. In addition, syngas and hydrogen production process is one of the promising chemical pathway for storage and transportation of solar heat by converting solar energy to chemical energy. After ten cycles of redox reaction, the $CeO_2/ZrO_2$ was analyzed using XRD pattern and SEM image in order to characterize the physical and chemical change of metal oxide at the high temperature.

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Numerical Simulations on the Thermal Flow and Particle Behaviors in the Gas Reversal Chamber of a Syngas Cooler for IGCC (IGCC 합성가스 냉각기 GRC의 열유동 및 입자거동 특성에 대한 전산해석 연구)

  • Park, Sangbin;Ye, Insoo;Ryu, Changkook;Kim, Bongkeun
    • Journal of the Korean Society of Combustion
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    • v.18 no.1
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    • pp.21-26
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    • 2013
  • In the Shell coal gasification process, the syngas produced in a gasifier passes through a syngas cooler for steam production and temperature control for gas cleaning. Fly slag present in the syngas may cause major operational problems such as erosion, slagging, and corrosion, especially in the upper part of the syngas cooler (gas reversal chamber, GRC). This study investigates the flow, heat transfer and particle behaviors in the GRC for a 300 MWe IGCC process using computational fluid dynamics. Three operational loads of 100%, 75% and 50% were considered. The gas and particle flows directly impinged on the wall opposite to the syngas inlet, which may lead to erosion of the membrane wall. The heat transfer to the wall was mainly by convection which was larger on the side wall at the inlet level due to the expansion of the cross-section. In the evaporator below the GRC, the particles were concentrated more on the outer channels, which needs to be considered for alleviation of fouling and blockage.

Performance and Emission Comparisons of a SI Engine Fueled by Syngas with Varying Hydrogen Content (합성가스 연료의 수소 함량 변화가 SI 엔진의 연소특성에 주는 영향)

  • Park, Seung-Hyun;Lee, Sun-Youp;Park, Cheol-Woong;Lee, Jang-Hee
    • Journal of the Korean Institute of Gas
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    • v.15 no.2
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    • pp.63-68
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    • 2011
  • As an effective utilization of biomass, organic wastes and coal, attention has been made to use syngas to a reciprocating engine to generate power. However, significant component variation of syngas depending upon origin and gasification conditions, and its lower heating value than that of LPG and CNG can create difficulties in stable engine operation. Thus it is necessary to address these issues in order to successfully develop power generation engines. As a primary step to resolve these problems, effects of H2 content variation in syngas on engine performance and emission characteristics were discussed in this study. The results show that as H2 % in syngas increases, more stable combustion was achieved with retarded MBT spark timing and engine efficiency becomes maximum with syngas of 10% H2. In addition, NOx emission increased while THC emission decreased as H2 % rises in the syngas.

Numerical Investigations on Laminar Flame Speed of Syngas Flames at IGCC Gas Turbine Condition (IGCC 가스터빈 운전조건에서의 석탄가스 층류화염속도에 대한 기초연구)

  • Lee, Jeong-Won;Oh, Kyung-Taek;Kim, Yong-Mo
    • Journal of the Korean Society of Combustion
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    • v.16 no.4
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    • pp.38-45
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    • 2011
  • Coal-derived syngas has been utilized by main fuel at IGCC power plant. Research efforts for investigating the characteristics of premixed and nonpremixed flames at gas-turbine condition have been conducted. The present study has been mainly motivated to evaluate the capability of the detailed chemical kinetics to predict the syngas laminar flame speed. Special emphasis is given to the effects of pressure, temperature, syngas composition, and dilution level on the characteristics of premixed and nonpremixed flames. The predicative capability of a number of detailed mechanism for laminar flame speed is compared to experimental data. From these results, detailed kinetics of Davis et al. and Li et al. have the best conformity with the experiments in the all the case of parametric studies.

Measurement of Laminar Flame Speed of Syngas(H2/CO)/Air Premixed Flame using the Bunsen Burner Method (분젠 버너법을 이용한 합성가스(H2/CO)/공기 예혼합화염의 층류 연소속도 측정)

  • Jeong, Byeonggyu;Lee, Kee-Man
    • 한국연소학회:학술대회논문집
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    • pp.181-183
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    • 2012
  • Syngas laminar flame speed measurements were carried out at atmospheric pressure and ambient temperature using the Bunsen flame configuration with nozzle burner as a fundamental study on flame stability of syngas. Representative syngas mixture compositions ($H_2:CO$) such as 25:75%, 50:50% and 70:25% and equivalence ratios from 0.5 to 1.4 were investigated. The measured laminar flame speeds were in good agreement with the previous numerical data as well as experimental data available in the literatures over a wide range of equivalence ratio tested. It was reconfirmed that the laminar flame speed gradually increased with the increase in $H_2$ content in a fuel mixture. In particular, the significant increasing rate of flame speed was observed with the increase in equivalence ratio.

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Performance Analysis of a Gas Turbine for Power Generation using Syngas as a Fuel (Syngas및 수소를 연료로 사용하는 발전용 가스터빈 성능해석)

  • Lee, J.J.;Cha, K.S.;Sohn, J.L.;Kim, T.S.
    • Proceedings of the KSME Conference
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    • pp.3241-3246
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    • 2007
  • Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed with hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of the syngas to the performance of a gas turbine in a combined cycle power plant. For this purpose, a commercial gas turbine is selected and its performance characteristics are analyzed with three different fuels, i.e., natural gas ($CH_4$), syngas and hydrogen. It is found that different heating values of those fuels and chemical compositions in their combustion gases are the causes in the different performance characteristics.

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Effects of H2O/N2 Blended Dilution on Flame Structure and NOx Formation Characteristics in High Pressure Condition (고압조건에서 H2O/N2 혼합희석이 IGCC 가스터빈 연소기의 화염구조 및 NOx 생성특성에 미치는 영향 해석)

  • Park, Sangwoon;Shin, Youngjun;Kim, Yongmo
    • 한국연소학회:학술대회논문집
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    • pp.75-76
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    • 2014
  • The present study has numerically investigated the effects of the oxidizer-side nitrogen dilution on the precise structure and NOx formation characteristics of the turbulent syngas nonpremixed flames. Eulerian particle flamelet model was used to predicted the NOx formation characteristics in the turbulent syngas swirling nonpremixed flames. Current numerical simulation was conducted for the syngas gas turbine combustor. Numericla results indicate that as the H2O portion is increased in diluent, the formation of NOx decreased effectively in turbulent syngas swirl nonpremixed flames.

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Assessment of Dual Fuel Engine Performance Using Biomass Syngas (바이오매스 합성가스를 이용한 혼소식 디젤엔진 발전기의 적용성 평가)

  • Yoon, Yeo Seong;Seo, Do Hyun;Kang, ku;Choi, Sun Hwa;Hong, Seong Gu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.59 no.1
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    • pp.109-116
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    • 2017
  • Biomass gasification produces syngas or producer gas as low calorific fuel gas that can be used as a fuel for combustion or prime movers as well as chemical synthesis. Internal combustion engines are readily available with lower costs and easily used for producing distributed power using biomass syngas. In this study, a dual fuel diesel engine was used to evaluate its performance when biomass syngas is used for fuel. The engine was originally developed for biogas application with a diesel engine with a 2,607 cc displacement. Both diesel fuel and syngas consumptions were observed at the different load conditions. The results indicate that the dual fuel engine showed a reasonably good performance and up to 63 % of diesel fuel saving.