• Title, Summary, Keyword: syngas

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Numerical Study on Flame Structure and Pollutant Formation for Syngas Turbulent Nonpremixed Swirling Flames (석탄가스 난류 선회 비예혼합 연소기의 화염구조 및 공해물질 생성의 해석)

  • Lee, Jeongwon;Kim, Yongmo
    • 한국연소학회:학술대회논문집
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    • pp.289-291
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    • 2012
  • The present study numerically investigate detailed flame structure of the Syngas diffusion flames. In order to realistically represent the turbulence-chemistry interaction and the spatial inhomogeneity of scalar dissipation rate, the Eulerian Particle Flamelet Model(EPFM) with multiple flamelets has been applied to simulate the combustion processes and NOx formation in the syngas turbulent nonpremixed flames. And level-set approach is also utilized to account for the partially premixing effect at fuel and oxidizer injector in KEPRI nonpremixed combustor. Based on numerical results, the detailed discussion has been made for the precise structure and NOx formation characteristics of the turbulent syngas nonpremixed flames.

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Performance Analysis of a Gas Turbine for Integrated Gasification Combined Cycle (석탄가스화 복합화력 발전용 가스터빈 성능해석)

  • Lee, J.J.;Cha, K.S.;Sohn, J.L.;Kim, T.S.
    • 한국신재생에너지학회:학술대회논문집
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    • pp.771-774
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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 syngas. 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. Also, Changing of turbine inlet Mass flow lead to change the turbine matching point, in the event the pressure ratio is changed.

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Studies on syngas production and gas engine generation of soild waste gasification in the fixed bed gasification melting furnace (고정층 가스화 용융로에서의 고상폐기물 가스화 합성가스 생산 및 가스엔진 발전 연구)

  • Gu, Jae-Hoi;Kim, Su-Hyun;Yoo, Young-Don;Yun, Yong-Seung;Lee, Hyup-Hee;Nam, Sang-Ik;Yoon, Jae-Kwan
    • 한국신재생에너지학회:학술대회논문집
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    • pp.717-720
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    • 2007
  • The 3 ton/day-scale pilot plant consists of compressor, feed channel, fixed bed type gasification & melting furnace, quench scrubber, demister, flare stack and gas engine. Syngas composition of gasification using the 35.50(waste I), 4.34%(wasteII) moisture-containing solid waste showed waste I CO 25-35%, 20-40% hydrogen, waste II 25-35%, 20-30% hydrogen. Gasification melting furnace was operated $1,500{\sim}1,600^{\cdot}C$. Gas engine was generated $35{\sim}40$ kW as waste gasification syngas.

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Experimental Study on Effects of Syngas Addition in Flame Propagation and Stability of DME-Air Premixed Flames (디메틸에테르-공기 예혼합화염의 화염전파와 화염안정성에 있어서 합성가스의 첨가효과에 관한 실험적 연구)

  • Song, Wonsik;Park, Jeong;Kwon, Ohboong;Yun, Jinhan;Kee, Sangin
    • Journal of the Korean Society of Combustion
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    • v.17 no.4
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    • pp.44-50
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    • 2012
  • The present study was conducted to investigate the flame instability(evaluated by Markstein length and cellular instability) and laminar burning velocity in a constant volume combustion chamber at room temperature and elevated pressure up to 0.3 MPa to suggest the possibility of utilizing mixtures of syngas added DME-air premixed flames in internal combustion engines. The experimentally measured laminar burning velocities were compared to predictions calculated the PREMIX code with Zhao reaction mechanism. Discussions were made on effects of syngas addition into DME-Air premixed flames through evaluating laminar burning velocity, Markstein length, and cellular instability. Particular concerns are focused on cellular instability caused by hydrodynamic instability and diffusive-thermal instability.

Studies on Reforming Gas Assisted Regeneration of Multi-channel Catalyzed DPF (합성가스(Reforming gas)를 이용한 멀티채널 CDPF의 재생 특성 연구)

  • Choi, Kwang-Chun;Chung, Jin-Hwa;Song, Soon-Ho;Chun, Kwang-Min
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.3
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    • pp.138-145
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    • 2011
  • Diesel particulate filter (DPF) systems are being used to reduce the particulate matter emission of diesel vehicles. The DPF should be regenerated after certain driving hours or distance to eliminate soot in the filter. The most widely used method is active regeneration with oxygen at $550{\sim}650^{\circ}C$. Syngas (synthetic gas) can be used to lower the regeneration temperature of Catalyzed DPF (CDPF). The syngas is formed by fuel reforming process of CPOx (Catalytic Partial Oxidation) at specific engine condition (1500rpm, 2bar) using 1wt.% $Rh/CeO_2-ZrO_2$ catalyst. The oxidation characteristics of PM with syngas supplied to filter were studied using partial flow system that can control temperature and flow rate independently. The filter is coated with washcoat loading of $25g/ft^3$ $Pt/Al_2O_3-CeO_2$, and multi-channel CDPF (MC-CDPF) was used. The filter regeneration experiments were performed to investigate the effect of syngas exothermic reaction on soot oxidation in the filter. For this purpose, before oxidation experiment, PM was collected about 8g/L to the filter at engine condition of 1500rpm, bmep 8bar and flow temperature of $200^{\circ}C$ Various conditions of temperature and concentration of syngas were used for the tests. Regeneration of filter started at 2% $H_2$ and CO concentration respectively and inlet temperature of $260^{\circ}C$. Filter Regeneration occurs more actively as the syngas concentration becomes higher.

Experimental Study on Cellular Instabilities in Diluted Syngas-Air Premixed Flames (희석제가 첨가된 합성가스-공기 예혼합화염에 있어서 셀 불안정성에 관한 실험적 연구)

  • Vu, Tran Manh;Song, Won-Sik;Park, Jeong;Kim, Jeong-Soo;Yun, Jin-Han;Keel, Sang-In
    • Journal of the Korean Society of Propulsion Engineers
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    • v.14 no.5
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    • pp.72-83
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    • 2010
  • Experiments were conducted to investigate the effects of added diluents (carbon dioxide, nitrogen, and helium) on cellular instabilities in outwardly propagating spherical syngas-air premixed flames. Laminar burning velocities and Markstein lengths were measured 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- and nitrogen-diluted syngas-air flames were not suppressed.

Stability of Attached Flame in $H_2$/CO Syngas Non-premixed Turbulent Jet Flame ($H_2$/CO 합성가스 비예혼합 난류 제트화염에서 부착화염의 화염안정화)

  • Hwang, Jeong-Jae;Bouvet, Nicolas;Sohn, Ki-Tae;Yoon, Young-Bin
    • Journal of the Korean Society of Combustion
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    • v.17 no.1
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    • pp.22-29
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    • 2012
  • The detachment stability characteristics of syngas $H_2$/CO jet attached flames were studied. The flame stability was observed while varying the syngas fuel composition, coaxial nozzle diameter and fuel nozzle rim thickness. The detachment stability limit of the syngas single jet flame was found to decrease with increasing mole fraction of carbon monoxide in the fuel. In hydrogen jet flames with coaxial air, the flame detachment stability was found to be independent of the coaxial nozzle diameter. However, velocities of appearance of liftoff and blowout velocities of lifted flames have dependence. At lower fuel velocity range, the critical coaxial air velocity leading to flame detachment increases with increasing fuel jet velocity, whereas at higher fuel velocity range, it decreases. This increasing-decreasing non-monotonic trend appears for all $H_2$/CO syngas compositions (50/50~100/0% $H_2$/CO). To qualitatively understand the flame behavior near the nozzle rim, $OH^*$ chemiluminescence imaging was performed near the detachment limit conditions. For all fuel compositions, local extinction on the rim is observed at lower fuel velocities(increasing stability region), while local flame extinction downstream of the rim is observed at higher fuel velocities(decreasing stability region). Maximum values of the non-monotonic trends appear to be identical when the fuel jet velocity is normalized by the critical fuel velocity obtained in the single jet cases.

A Study on the Combustion Characteristics of a Generator Engine Running on a Mixture of Syngas and Hydrogen (발전용 합성가스 엔진의 수소 혼합 비율에 따른 연소 특성 연구)

  • Park, Seung-Hyun;Park, Cheol-Woong;Lee, Sun-Youp;Kim, Chang-Gi
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.7
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    • pp.693-699
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    • 2011
  • Internal combustion engines running on syngas, which can be obtained from biomass or organic wastes, are expected to be one of the suitable alternatives for power generation, because they are environment-friendly and do not contribute to the depletion of fossil fuels. However, syngas has variable compositions and a lower heating value than pure natural gas, owing to which the combustion conditions need to be adjusted in order to achieve stable combustion. In this study, a gas that has the same characteristics as syngas, such as low heating value (LHV), was produced by mixing $N_2$ with compressed natural gas (CNG). In addition, this study investigates the combustion characteristics of syngas when it is mixed with hydrogen in a ratio ranging from 10% to 30% with a constant LHV of total gas.

The Study of the Integrated Technology of the Dual Fluidized-bed Gasification for Producing Medium Heating Value Syngas (중발열량 합성가스 생산을 위한 일체형 이중유동층 가스화 기술 연구)

  • Choi, Jae-Myeong;Kim, Jae-Min;Kim, Sung-Hyun;Son, Yang-Seung;Lee, Dong-Min;Choi, Jin-Hoon;Park, Sung-Youl;Kim, Seong-Soo
    • Clean Technology
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    • v.19 no.3
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    • pp.226-232
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    • 2013
  • A 5 kg/hr scale integral dual fluidized-bed gasifier for producing medium heating value syngas from biomass or combustible wastes was manufactured. The effect of operating variables including gasification temperature, rate of feeding, and weight ratio of steam/feed on the behavior of the gasifier was investigated. The contents of $H_2$ and CO in syngas, flow rate of feeding, cold gas efficiency increased with the increased gasification temperature or rate of feeding, but decreased with the increased weight ratio of steam/feed within the experimental range. With wood powder as the feed, the concentrations of $H_2$ and CO in the syngas were as high as 41% and 32%, and the cold gas efficiency and lower heating value of the syngas were as high as 70.1% and $3,428kcal/Nm^3$. With food wastes as the feed, the concentrations of $H_2$ and CO in the syngas were as high as 37% and 23.9%, and the cold gas efficiency and lower heating value of the syngas were as high as 66.7% and $3,670kcal/Nm^3$.

Effect of the Steam Flow Rate on Syngas Productivity in IGCC Gasifier for a Power Generation (IGCC 발전용 가스화기에서 증기 주입량이 합성가스 생산량에 미치는 영향)

  • Keum, Kyung-Nam;Yoo, Ho-Seon
    • Plant Journal
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    • v.15 no.3
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    • pp.29-34
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    • 2019
  • In the study, the effect of steam injection on syngas productivity was investigated under the constant operating conditions of gasifier oxygen load while the coal feed was fixed and the steam injection flow rate is changed in Taean IGCC plant. The maximum syngas average productivity was found to be at 80 % and 90 % of gasifier oxygen loads with the steam injection flow rate of 0.14 kg/s and 0.15 kg/s per coal burner. Through this study, the syngas productivity was changed by adjusting the steam injection amount and as the steam injection flow rate increased, the syngas productivity increased and then decreased again. The syngas productivity can be increased only by steam injection without supplying additional coal and it is considered that the syngas productivity has different characteristics depending on coal type. Thus it is recommended to operate the gasifier using Carbo-One coal with the steam injection flow rate of about 0.14 kg/s per coal burner when the gasifier oxygen load is 80 % ~ 90 %.