• Title, Summary, Keyword: Syngas

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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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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.

Stability Characteristics of Syngas($H_2$/CO)/Air Premixed Flames using an Impinging Jet Burner (충돌제트 버너에서 합성가스($H_2$/CO)/공기 예혼합화염의 안정화 특성)

  • Park, Ju-Yong;Lee, Kee-Man;Hwang, Cheol-Hong
    • Journal of the Korean Society of Combustion
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    • v.16 no.1
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    • pp.15-21
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    • 2011
  • An experimental study was conducted to investigate the flame stability of the synthetic gas (syngas) using an impinging premixed jet burner. Since the syngas mainly consisted of $H_2$ and CO, the $H_2$/CO mixture was simulated as the syngas. $H_2$/CO mixture ratios, fuel/air mixture velocities and equivalence ratios were used as major parameters on the flame stabilitym The role of the impinging plate on the flame stability was also examined. In addition, laminar burning velocities of the $H_2$/CO mixture were predicted numerically to understand the characteristics of the flame stability for the syngas. The increase in the H2 concentration into the syngas brings about the extension of the blowout limit and the reduction in the flashback limit in terms of the stable flame region. The impinging jet plate broadened the blowout limit but does not play important role in changing of the flashback limit. Finally, it was found that the stability region of the flame using the syngas, which is expressed in terms of the mixture velocity and the equivalence ratio in this study, significantly differed from that of $CH_4$.

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.

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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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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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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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.

Comparison of effects of spark timing and fuel ratio on engine efficiency and $NO_x$ emission for fuel of city gas and syngas($H_2$ and CO) (도시가스와 혼합가스($H_2$, CO) 적용 시 점화시기 및 공연비에 따른 발전효율 및 질소산화물 배출량 비교)

  • Jeong, Chul-Young;Lee, Kyung-Teak;Song, Soon-Ho;Chun, Kwang-Min;Nam, Sang-Ick
    • 한국신재생에너지학회:학술대회논문집
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    • pp.817-820
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    • 2009
  • Research on usage of syngas produced by waste gasification is on going all around the world. Syngas which consists of $H_2$, CO, $CO_2$, $N_2$, has different combustion characteristics from current city gas; due to distinct flame propagation speed of the fuel, syngas has different spark timing and air fuel ratio at maximum generating efficiency. This is why finding both the optimum point of spark timing and air fuel ratio is so important in order to improve thermo efficiency and secure stable running of gas generated by relatively low heating value syngas. Moreover, since emission of $NO_x$ is strictly regulated, it is important to operate lean burn condition that reduces NOx emission.

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