• Title, Summary, Keyword: Syngas

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A Study on the Emission Characteristics of Syngas(H2/CO)-Air Premixed Flame according to the H2 contents (수소 함유량에 따른 합성가스(H2/CO)-공기 예혼합 화염의 배출특성 연구)

  • Jeong, Byeong;Choi, Jongmin;Lee, Keeman
    • 한국연소학회:학술대회논문집
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    • pp.9-10
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    • 2013
  • This study reports the results of an experimental investigation of emission and temperatures from the syngas-air premixed flame with a various mixture composition in the region of large equivalence ratios. The effects of hydrogen contents and equivalence ratios on the flame velocity, which reported before, and emission of syngas fuel are examined. In this study, representative syngas mixture compositions ($H_2:CO$) such as $H_2:CO=10:90$, 25:75, 50:50 and 75:25 and equivalence ratios from 0.5 to 5.0 have been conducted. The emissions of syngas fuel were measured by the high precision analyzer with enclosure configuration and the adiabatic temperatures are calculated by used Chemkin basis. The NOx emission level is coincided relatively well with the adiabatic temperature distributions in lean mixture conditions, but for rich mixture conditions NOx level was also increased again even though the adiabatic temperature decreases. Such an increasing characteristics in rich mixture conditions is coincided well with the tendency that rather the flue gas temperature increases.

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Performance Analysis of a Gas Turbine for Power Generation Using Syngas as a Fuel (Syngas를 연료로 사용하는 발전용 가스터빈의 성능해석)

  • Lee, Jong-Jun;Cha, Kyu-Sang;Sohn, Jeong-Lak;Joo, Yong-Jin;Kim, Tong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.1
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    • pp.54-61
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    • 2008
  • Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed of 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 using syngas in a gas turbine, originally designed for natural gas fuel, on its performance. A commercial gas turbine is selected and variations of its performance characteristics due to adopting syngas is analyzed by simulating off-design gas turbine operation. Since the heating value of the syngas is lower, compared to natural gas, IGCC plants require much larger fuel flow rate. This increases the gas flow rate to the turbine and the pressure ratio, leading to far larger power output and higher thermal efficiency. Examination of using two different syngases reveals that the gas turbine performance varies much with the fuel composition.

A Study on Cold Start Emission Characteristics using the Syngas in a SI Engine (합성가스를 이용한 SI 엔진의 냉간시동 배기가스 배출특성에 관한 연구)

  • Song, Chun-Sub;Kim, Chang-Gi;Kang, Kern-Young;Cho, Yong-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.3
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    • pp.66-72
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    • 2008
  • Fuel reforming technology for the fuel cell vehicles could be adopted 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 2.0 liter gasoline engine during the cold start and early state of idle condition. Not only cold start HC emission but also $NO_x$ emission could be dramatically reduced due to the fact that syngas has no HC and has nitrogen up to 50% as components. Exhaust gas temperature was lower than that of gasoline feeding condition. Delayed ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in the gasoline internal combustion engine is an effective solution to meet the future strict emission regulations by the reduction of cold start THC and $NO_x$ emissions.

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.

Flame Length and EINOx Scaling of Syngas $H_2$/CO Turbulent Non-premixed Jet Flames ($H_2$/CO 합성가스의 비예혼합 난류 제트화염에서 화염 길이와 EINOx 스케일링)

  • Hwang, Jeongjae;Sohn, Kitae;Bouvet, Nicolas;Yoon, Youngbin
    • Journal of the Korean Society of Combustion
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    • v.17 no.4
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    • pp.30-37
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    • 2012
  • The flame lengths and NOx emission characteristics of syngas $H_2$/CO turbulent non-premixed jet flames were investigated. The flame length which is the main parameter governs NOx emission was studied for various syngas compositions. The flame length was compared with previous correlation between Froude number and flame height and it shows that they have good agreements. It was confirmed that the turbulent jet flames herein investigated are in the region of buoyancy-momentum transition. NOx emission was reduced with increased Reynolds number and CO contents in syngas fuel and with decreased fuel nozzle diameter which is attributed by decreased flame residence time. Previous EINOx scaling based on flame residence time of $L_f^3/(d_f^2U_f)$ satisfies only the jet flame in momentum-dominated region, not buoyancy-momentum transition region. The simplified flame residence time ($L_f/U_f$) was adopted in modified EINOx scaling. The modified scaling satisfies the jet flames not only in momentum-dominated region but in buoyancy-momentum transition region. The scaling is also satisfied with $H_2$/CO syngas jet flames.

Performance and Economic Analysis of Natural Gas/Syngas Fueled 100 MWth Chemical-Looping Combustion Combined Cycle Plant (천연가스/합성가스 이용 100 MWth 매체순환연소 복합발전 플랜트의 성능 및 경제성 평가)

  • Park, Young Cheol;Lee, Tai-yong;Park, Jaehyeon;Ryu, Ho-Jung
    • Korean Chemical Engineering Research
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    • v.47 no.1
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    • pp.65-71
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    • 2009
  • In this study, performance and economic analysis of natural gas/syngas fueled 100 MWth chemical-looping combustion (CLC) combined cycle plant were performed. Net efficiency of both cases was 53~54%, corresponding to previous research. We used Chemical Engineering Plant Cost Index and Guthrie method to evaluate plant cost. For syngas fueled CLC combined cycle plant, the plant cost was higher since lower heating value(LHV) of syngas was lower than that of natural gas and cost of electricity(COE) was also higher since the cost of syngas was higher than that of natural gas. By sensitivity analysis, it was shown that the cost of syngas should be less than 5.3 $/GJ in order to make COE lower than 5.8 ¢/kWh which was COE of natural gas fueled CLC combined cycle plant.

Study on the Performance of a Spark Ignition Gas Engine for Power Generation fueled by the Methane/Syngas Mixture (메탄/합성가스 혼합물에 의한 발전용 SI 가스엔진의 성능에 관한 연구)

  • Cha, Hyoseok;Hur, Kwang Beom;Song, Soonho
    • Journal of the Korean Institute of Gas
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    • v.19 no.5
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    • pp.7-12
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    • 2015
  • Hydrogen is usually produced by using syngas generated by the fuel reforming for natural gas so far. The further process is needed for increasing the hydrogen yield of syngas. However, the process for upgrading the hydrogen yield is accompanied by additional energy sources and economic costs. Thus related studies on the method for using as a mixture in itself have been conducted in order to utilize more efficiently syngas. The effect on the engine performance for methane/syngas mixture of 30kW spark ignition gas engine for power generation has been investigated in this study. As a result, it was found that the combustion phenomena such as the maximum in-cylinder pressure and crank angle at that time have been improved by methane/syngas mixture. Through these, fuel conversion efficiency could be enhanced by about 98% of methane/hydrogen mixture and $NO_x$ emissions could be reduced by about 12% of methane-hydrogen mixture.

Experimental Study on the Combustion Characteristics of Syngas-Oxyfuel Diffusion Flames (Syngas-순산소 확산화염의 연소특성에 관한 실험적 연구)

  • Lee, Sang-Min;Choi, Won-Seok;Ahn, Kook-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.6
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    • pp.553-560
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    • 2010
  • The characteristics of syngas-oxyfuel combustion has been investigated experimentally in the present study. Experimental measurements were conducted to aid a fundamental design of a syngas-oxyfuel combustor with a double coaxial burner configuration. To examine the effects of different syngas fuels on combustion characteristics, various fuel types are utilized such as commercial coal gases (Texaco, Shell), COG (cokes oven gas), and $CH_4$ as a main component of natural gas. $CO_2$ was added to the four fuel types as a diluent gas to reduce the flame temperature. The flame images and emission characteristics of NOx and CO were examined for various equivalence ratio and $CO_2$ dilution ratio. The results show that CO emission was rapidly increased as equivalence ratio approached the stoichiometry condition by reducing the amount of oxygen. As the $CO_2$ dilution increased, CO emission increased while NOx emission decreased due to reduced flame temperature. When the syngas-oxyfuel combustor is operated with 20~40% of $CO_2$ dilution ratio, the CO and NOx emission levels were kept below 50 ppm and 25 ppm, respectively, with a high concentration of $CO_2$ over 95 vol.% in exhaust gases.

Syngas/Diesel Dual Fuel Combustion in a Compression Ignition Engine with Different Composition Ratios of Syngas and Compression Ratios (합성가스/디젤 혼소압축착화 엔진의 합성가스 혼합비와 압축비에 따른 연소 및 배출가스 특성)

  • Lee, Junsun;Chung, Tahn;Lee, Yonggyu;Kim, Changup;Oh, Seungmook
    • Journal of ILASS-Korea
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    • v.24 no.1
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    • pp.35-42
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    • 2019
  • Syngas is widely produced by incomplete combustion of coal, water vapor, and air (oxygen) in a high-temperature/high-pressure gasifier through a coal-gasification process for power generation. In this study, a simulation syngas which was mainly composed of $H_2$, CO, $CO_2$, and $N_2$ was fueled with diesel. A modified single cylinder compression ignition (CI) engine is equipped with intake port syngas supply system and mechanical diesel direct injection system for dual fuel combustion. Combustion and emission characteristics of the engine were investigated by applying various syngas composition ratios and compression ratios. Diesel fuel injection timing was optimized to increase indicated thermal efficiency (ITE) at the engine speed 1,800 rpm and part load net indicated mean effective pressure ($IMEP_{net}$) 2 to 5 bar. ITE of the engine increased with the $H_2$ concentration, compression ratio and engine load. With 45% of $H_2$ concentration, compression ratio 17.1 and $IMEP_{net}$ 5 bar, ITE of 41.5% was achieved, which is equivalent to that of only diesel fuel operation.

Numerical Study on the Stabilization of Turbulent Swirling Lifted Premixed Syngas Flames (석탄가스 난류선회유동 예혼합부상화염의 안정성 해석)

  • Kang, Sung-Mo;Lee, Jeong-Won;Kim, Yong-Mo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.349-352
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    • 2008
  • This study has numerically modeled the combustion processes of the turbulent swirling premixed lifted syngas flames in the low-swirl burner (LSB). In these turbulent swirling premixed flames, the four tangentially-injected air jets induce the turbulent swirling flow which plays the crucial role of stabilizing the turbulent lifted flames. In the present approach, the turbulence-chemistry interaction is represented by the level-set based flamelet model. Numerical results indicate clearly that the present level-set based flamelet approach has realistically simulated the structure and stabilization mechanism of the turbulent swirling premixed lifted flames in the low-swirl burner. Computations are made for the wide range of the syngas chemical composition and the dilution level at two pressure conditions (1.0, 5.0 bar). Numerical results indicate that the lifted height in the LSB is increased by decreasing the H2 percentage and increasing the dilution level at the given equivalence ratio. It is also found that the flashback is occurred for the hydrogen composition higher than 80% at the equivalence ratio, 0.8. However, at the syngas composition range in the IGCC system, the stable lean-premixed lifted flames are formed at the low-swirl burner.

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