• Title, Summary, Keyword: syngas

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A Performance prediction of Gas Turbine using syngas fuel in IGCC (가스화복합발전에서 Syngas 연료를 사용하는 가스터빈의 성능예측)

  • Seo, Seok-Bin;Kim, Jong-Jin;Chung, Jae-Hwa;Ahn, Dal-Hong
    • Proceedings of the KSME Conference
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    • pp.878-884
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    • 2001
  • IGCC(Integrated Gasification Combined Cycle) power plant are becoming more attractive because of fuel flexibility and low emission. In this study, performances are evaluated when the low caloric value syngas fuels producted in gasification process is used a gas turbine originally designed naturel gas fuel. Using GateCycle computational thermal analysis model, performances of GE 7FA gas turbine are predicted for using four types of syngas. Also, off design performance is presented for firing syngas fuel in the gas turbine.

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Operation Characteristics of Pilot-Scale Gasification System for Coal Syngas Production (석탄 합성가스 제조를 위한 pilot급 가스화 시스템 운전특성)

  • Chung, Seok-Woo;Jung, Woo-Hyun;Lee, Seung-Jong;Yun, Yong-Seung
    • New & Renewable Energy
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    • v.3 no.4
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    • pp.90-97
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    • 2007
  • Gasification has been regarded as a very important technology to decrease environmental pollution and to obtain higher efficiency. The coal gasification process converts carbon containing coal into a syngas, composed primarily of CO and $H_2$. And the coal syngas can be used as a source for power generation or chemical material production. This paper illustrates the opeartion characteristics and results of pilot-scale coal syngas production facilities. The entrained-bed pilot scale coal gasifier was operated normally in the temperature range of $1,300{\sim}1,400^{\circ}C,\;2{\sim}3kg/cm^2$ pressure. And Indonesian KPC coal produced syngas that has a composition of $46{\sim}54%\;CO,\;20{\sim}26%\;H_2,\;and\;5{\sim}8%\;CO_2$.

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Operation Characteristics of Pilot-Scale Gasification System for Coal Syngas Production (석탄 합성가스 제조를 위한 pilot급 가스화 시스템 운전특성)

  • Chung, Seok-Woo;Jung, Woo-Hyun;Lee, Seung-Jong;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.429-432
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    • 2007
  • Gasification has been regarded as a very important technology to decrease environmental pollution and to obtain higher efficiency, The coal gasification process converts carbon containing coal into a syngas, composed primarily of CO and $H_2$. And the coal syngas can be used as a source for power generation or chemical material production. This paper illustrates the operation characteristics and results of pilot-scale coal syngas production facilities. The entrained-bed pilot scale coal gasifier was operated normally in the temperature range of $1,300{\sim}1,400^{\cdot}C$, $2{\sim}3kg/cm^2$ pressure. And Indonesian KPC coal produced syngas that has a composition of $46{\sim}54$% CO, $20{\sim}26$% $H_2$, and $5{\sim}8$% $CO_2$.

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A Study on Idle Performance Improvements for a Gasoline Engine with the Syngas Assist (합성가스를 이용한 가솔린엔진 아이들 성능 개선에 관한 연구)

  • Song, Chun-Sub;Kim, Chang-Gi;Kang, Kern-Young;Cho, Young-Seok
    • 한국연소학회:학술대회논문집
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    • pp.245-251
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    • 2005
  • Recently, fuel reforming technology for the fuel cell vehicle has been applied to internal combustion engines, with various purpose. Syngas which is reformed from fossil fuel has hydrogen as a major component. It has better effort in combustion characteristics such as wide flammability and hig speed flame propagation. In this study, syngas was added to a gasoline engine for the improvement of combustion stability and exhaust emission in idle state. 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 extend lean operation limit and ignition retard range. with dramatical reduction of engine out emissions.

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Effects of Diluents on Cellular Instabilities in Outwardly Propagating Spherical Syngas-Air Premixed Flames

  • Vu, Tran Manh;Park, Jeong;Kwon, Oh-Boong;Kim, Jeong-Soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.191-196
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    • 2009
  • Experiments were conducted in a constant pressure combustion chamber using schlieren system to investigate the effects of carbon dioxide/nitrogen/helium diluents on cellular instabilities of syngas-air premixed flames at room temperature and elevated pressures. Laminar burning velocities and Markstein lengths were calculated by analyzing high-speed schlieren images at various diluent concentrations and equivalence ratios. Experimental results showed substantial reduction of the laminar burning velocities and of the Markstein lengths with the diluent additions in the fuel blends. Effective Lewis numbers of helium-diluted syngas-air flames increased but those of carbon dioxide- and nitrogen-diluted syngas-air flames decreased in increase of diluents in the reactant mixtures. With helium diluent, the propensity for cells formation was significantly diminished, whereas the cellular instabilities for carbon dioxide-diluted and nitrogen-diluted syngas-air flames were not suppressed.

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Numerical Analysis on the Heat Transfer Characteristics of Syngas Cooling System of an IGCC Process (IGCC 합성가스 냉각 시스템의 열전달 특성 연구)

  • Oh, Junho;Ye, In-soo;Park, Sangbin;Ryu, Changkook;Park, Sungku
    • 한국연소학회:학술대회논문집
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    • pp.65-68
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    • 2013
  • In a syngas cooling system of coal gasification process, fly slag carried by syngas deposit on the surface of heat exchanger. The deposited materials form a fouling layer with several millimeters thickness, disturbing heat transfer between steam and syngas. This study investigates flow and heat transfer characteristics of syngas in helical coil heat exchanger using computational fluid dynamics under clean and fouled surface condition. Process model were also designed and its results are in good agreement with CFD results.

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Computational Analysis of the Effects of Spray Parameters and Piston Shape on Syngas-Diesel Dual-Fuel Engine Combustion Process

  • Ali, Abubaker Ahmed M.M.;Kabbir, Ali;Kim, Changup;Lee, Yonggyu;Oh, Seungmook;Kim, Ki-seong
    • Journal of ILASS-Korea
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    • v.23 no.4
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    • pp.192-204
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    • 2018
  • In this study, a 3D CFD analysis method for the combustion process was established for a low calorific value syngas-diesel dual-fuel engine operating under very lean fuel-air mixture condition. Also, the accuracy of computational analysis was evaluated by comparing the experimental results with the computed ones. To simulate the combustion for the dual-fuel engine, a new dual-fuel chemical kinetics set was used that was constituted by merging two verified chemical kinetic sets: n-heptane (173 species) for diesel and Gri-mech 3.0 (53 species) for syngas. For dual-fuel mode operations, the early stage of combustion was dominated by the fuel burning inside or near the spray plume. After which, the flame propagated into the syngas in the piston bowl and then proceeded toward the syngas in the squish zone. With the baseline injection system and piston shape, a significant amount of unburned syngas was discharged. To solve this problem, effects of the injection parameters and piston shape on combustion characteristics were analyzed by calculation. The change in injection variables toward increasing the spray plume volume or the penetration length were effective to cause fast burning in the vicinity of TDC by widening the spatial distribution of diesel acting as a seed of auto-ignition. As a result, the unburned syngas fraction was reduced. Changing the piston shape with the shallow depth of the piston bowl and 20% squish area ratio had a significant effect on the combustion pattern and lessened the unburned syngas fraction by half.

A Study on Reductions of Cold Start Emissions with Syngas Assist in an SI Engine (합성가스를 첨가한 SI 엔진의 냉간시동 유해 배기가스 저감에 관한 연구)

  • Song, Chun-Sub;Ka, Jae-Geum;Hong, Woo-Kyung;Park, Jeoung-Kwon;Cho, Yong-Seok;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.4
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    • pp.114-120
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    • 2011
  • Fuel reforming technology for the fuel cell vehicles has been frequently 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 paper, syngas was feed to a 2.0 liter SI engine with MPI to improve exhaust emissions under cold start and early state of idle condition. Syngas fraction is varied to 0%, 10%, 25%, with various ignition timings. Exhaust emission characteristics and the exhaust system temperature were measured to investigate the effects of syngas addition on cold start. Result showed that HC emission could be dramatically reduced due to the fact that syngas has $H_2$ and no HC as components. The amount of $NO_x$ emission was decreased with the increase of syngas fraction. Because the dilution effect of $N_2$ and the retard of ignition timing reduces the peak combustion temperature inside the cylinder. Exhaust gas temperature was lower than that of gasoline feeding condition. Retarded ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in an SI engine is an effective solution to meet the future strict emission regulations.

A Study on Syngas Co-combustion Characteristics in a Heavy Oil Combustion System with Multi Burners (멀티 버너 중유 연소로에서의 합성 가스 혼합 연소 특성 연구)

  • Yang, Dong-Jin;Choi, Shin-Young;Yang, Won
    • Journal of the Korean Society of Combustion
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    • v.15 no.1
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    • pp.43-49
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    • 2010
  • Co-combustion of syngas in an existing boiler can be one of the options for replacing conventional fossil fuel with alternative fuels such as waste and biomass. This study is aimed to investigate effects of syngas cocombustion on combustion characteristics and boiler efficiency. An experimental study was performed for a pilot-scale furnace with 4 oil burners. Tests were conducted with mixture-gas as a co-combustion fuel and heavy oil as a main fuel. The mixture-gas was composed of 15% CO, 7% $H_2$, 3% $CH_4$ and 75% $N_2$ for simulating syngas from air-blown gasification. And LHV of the mixture-gas was 890 kcal/$Nm^3$. Temperature distribution in the furnace and flue gas composition were measured for various heat replacement ratio by the mixture gas. Heat loss through the wall was also carried out through heat & mass balance calculation, in order to obtain informations related to boiler efficiency. Experimental results show that similar temperature distribution and flue gas composition can be obtained for the range of 0~20% heat replacement by syngas. NOx concentration is slightly decreased for higher heat replacement by the syngas because fuel NOx is decreased in the case. Meanwhile, heat loss is a bit decreased for higher heat replacement by the syngas, which implies that boiler efficiency can be a bit decreased when syngas co-combustion is applied to a boiler.

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 $CH_4$.