• Title, Summary, Keyword: syngas

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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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Experimental Study on the NOx Emission Characteristics of Low Calorific Value(LCV) Gas Fuel at Premixed Combustion Condition (저 발열량 가스 연료의 예혼합 연소시 NOx 발생 특성에 관한 실험적 연구)

  • Kim, Yong-Chul;Lee, Chan;Yun, Yong-seung
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.23-29
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    • 1999
  • Experimental studies are conducted to investigate the flame stability and the thermal/fuel NOx formation characteristics of the low calorific value (LCV) coal derived gas fuel. Synthetic LCV fuel gas is produced by mixing carbon monoxide, hydrogen, nitrogen and ammonia on the basis that the thermal input of the syngas fuel into a burner is identical to that of natural gas. The syngas mixture is fed to and burnt with air on flat flame burner. With the variation of the equivalence ratio for specific syngas fuel, flame behaviors are observed to identify the flame instability due to blow-off or flashback and to define stable combustion range. Measurements of NOx content in combustion gas are made for comparing thermal and fuel NOx from the LCV syngas combustion with those of the natural gas one. In addition, the nitrogen dilution of the LCV syngas is preliminarily attempted as a NOx reduction technique, and its effects on thermal and fuel NOx production are discussed.

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A Study on the Effects of EGR with Syngas Addition in a Gasoline Engine (가솔린 엔진에서 합성가스 첨가량에 따른 EGR 효과에 대한 연구)

  • Yun, Young-Jun;Choi, Young;Kang, Kern-Yong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.6
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    • pp.159-164
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    • 2007
  • The purpose of this study is to reduce harmful emission gases in the range of stable combustion without loss of a thermal efficiency. Therefore, effects of both exhaust gas recirculation(EGR) and synthetic gas addition on engine performance and emission were investigated in a gasoline engine. Synthetic gas(syngas), which is in general prepared from reforming gasoline, was utilized in order to promote stable combustion. The major components of syngas are H2, CO and $N_2$ gases. The percentage of syngas addition was changed from 0 to 30% in energy fraction and EGR rate was varied up to 30%. As a result, $COV_{IMEP}$ as a parameter of combustion stability was decreased and THC/$NO_X$ emissions were reduced with the increase of syngas addition. And $COV_{IMEP}$ was increased with the increase of EGR but $NO_X$ emission was greatly reduced. In addition, under the region where the EGR rate is around 20%, thermal efficiency was improved.

THE PARTIAL COMBUSTION OF METHANE TO SYNGAS OVER PRECIOUS METALS AND NICKEL CATALYSTS SUPPORTED ON -γAL2O3 AND CEO2

  • Seo, Ho-Joon
    • Environmental Engineering Research
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    • v.10 no.3
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    • pp.131-137
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    • 2005
  • The catalytic activity of precious metals(Rh, Pd, Pt) and nickel catalysts supported on ${\gamma}-Al_2O_3\;and\;CeO_2$ in the partial combustion of methane(PCM) to syngas was investigated based on the product distribution in a fixed bed now reactor under atmospheric condition and also on analysis results by SEM, XPS, TPD, BET, and XRD. The activity of the catalysts based on the syngas yield increased in the sequence $Rh(5)/CeO_2{\geq}Ni(5)/CeO_2>>Rh(5)/Al_2O_3>Pd(5)/Al_2O_3>Ni(5)/Al_2O_3$. Compared to the precious catalysts, the syngas yield and stability of the $Ni(5)/CeO_2$ catalyst were almost similar to $(5)/CeO_2$ catalyst, and superior to these of any other catalysts. The syngas yield of $Ni(5)/CeO_2$ catalyst was 90.66% at 1023 K. It could be suggested to be the redox cycle of the successive reaction and formation of active site, $Ni^{2-}$ and the lattice oxygen, $O^{2-}$ produced due to reduction of $Ce^{4-}$ to $Ce^{3-}$.

Syngas and Hydrogen Production under concentrated solar radiation : Redox system of $ZrO_2$ nano-structure (고온 태양열을 이용한 합성가스 및 수소 생산 : $ZrO_2$ 나노 구조화에 따른 산화/환원 특성)

  • Jang, Jong-Tak;Lee, Jong-Min;Cho, Eun-Su;Yang, Seung-Chan;Yoon, Ki-June;Han, Gui-Young
    • 한국태양에너지학회:학술대회논문집
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    • pp.463-469
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    • 2012
  • Solar thermochemical syngas and hydrogen production process bv redox system of metal oxide was performed under direct irradiation of the metal oxide on the SiC ceramic foam device using solar simulator. $CeO_2/ZrO_2$ nanotube has been synthesized by anodic oxidation method. 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. The produced syngas had the $H_2/CO$ ratio of 2, which was suitable for methanol synthesis or Fischer-Tropsch synthesis process. After ten cycles of redox reaction, $CeO_2$ 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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A Study on the Laminar Burning Velocity of Synthetic Gas of Coal Gasification(H2/CO)-Air Premixed Flames (석탄가스화 합성가스(H2/CO)-공기 예혼합화염의 층류 연소속도에 관한 연구)

  • Jeong, Byeonggyu;Lee, Keeman
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.5
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    • pp.493-502
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    • 2012
  • Syngas laminar burning velocity 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 fuel. Representative syngas mixture compositions ($H_2$:CO) such as 25:75%, 50:50% and 75:25% and equivalence ratios from 0.5 to 1.4 have been conducted. Average laminar burning velocities have been determined by the stabilized nozzle burner flames using the angle method, radical surface area method and compared with the data obtained from the other literatures. And the results of each experimental methodologies in the various composition ratios and equivalence ratios were coincided with the result of numerical simulation. Especially, it was confirmed that there was necessary to choice a more accurate measurement methodology even the same static flame method for the various composition ratios of syngas fuel including hydrogen. Also, it was reconfirmed that the laminar burning velocities gradually increased with the increasing of hydrogen content in a fuel mixture.

Characteristics of $H_2$/CO ratio control of syngas by waste gasification (폐기물 가스화 합성가스의 $H_2$/CO 생산비 제어 특성)

  • Gu, Jae-Hoi;Kim, Su-Hyun;Kim, Mun-Hyun;Choi, Jong-Hyea;Heo, Su-Jung;Yoon, Ki-Soo;Kim, Soung-Hyoun
    • 한국신재생에너지학회:학술대회논문집
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    • pp.475-478
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    • 2008
  • The 3 ton/day-scale pilot plant consists of waste press, feed channel, fixed bed type gasification & melting furnace, quench scrubber, syngas refinery facility and flare stack. $H_2$/CO ratio of gasification syngas using the solid waste and sludge in the 3 ton/day gasifier showed about 1. Gasification melting furnace was operated $1,300{\sim}1,600^{\circ}C$. $H_2$/CO ration control system was obtained $H_2$/CO ratio 2 and 3.

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Experimental Study on the Flame Behavior and the NOx Emission Characteristics of Low Calorific Value Gas Fuel (저 발열량 가스 연료의 화염거동 및 NOx 발생 특성에 관한 실험적 연구)

  • Kim, Yong-Chul;Lee, Chan
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.89-93
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    • 1999
  • Experimental studies are conducted to investigate the flame stability and the thermal/fuel NOx formation characteristics of the low calorific value(LCV) gas fuel. Synthetic LCV fuel gas is produced through mixing carbon monoxide, hydrogen, nitrogen and ammonia on the basis that the thermal input of the syngas fuel into a burner is identical to that of natural gas, and then the syngas mixture is fed to and burnt with air on flat flame burner. Flame behaviors are observed to identify flame instability due to blow-off or flash-back when burning the LCV fuel gas at various equivalence ratio conditions. Measurements of NOx in combustion gas are made for comparing thermal and fuel NOx emissions from the LCV syngas combustion with those of the natural gas one, and for analyzing ammonia to NOx conversion mechanism. In addition, the nitrogen dilution of the LCV syngas is preliminarily attempted as a NOx reduction technique.

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Fully coulpled CMC modeling for three-dimensional turbulent nonpremixed syngas flame (CMC 모델을 이용한 난류 비예혼합 Syngas 화염장 해석)

  • Kim, Gun-Hong;Lee, Jung-Won;Kim, Yong-Mo;Ahn, Kook-Young
    • 한국연소학회:학술대회논문집
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    • pp.111-120
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    • 2006
  • The fully coupled conditional moment closure(CMC) model has been developed to realistically simulate the structure of complex turbulent nonpremixed syngas flame, in which the flame structure could be considerablyl influenced by the turbulence, transport history, and heat transfer as well. In order to correctly account for the transport effect, the CMC transport equations fully coupled with the flow and mixing fields are numerically solved. The present CMC approach has successfully demonstrated the capability to realistically predict the detailed structure and the overall combustion characteristics. The numerical results obtained in this study clearly reveal the importance of the convective and radiative heat transfer in the precise structure and NOx emission of the present confined combustor with a cooling wall.

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Effect of H2/CO Ratio, Dilution Ratio, and Methane/Syngas Ratio on Combustion Characteristics of Syngas Turbine (H2/CO비, 희석량, 메탄/석탄가스비가 합성가스용 가스터빈의 연소특성에 미치는 영향)

  • Lee, Min Chul;Yoon, Youngbin
    • 한국연소학회:학술대회논문집
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    • pp.59-60
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    • 2012
  • This paper describes gas turbine combustion characteristics of synthetic gas which is mainly composed of hydrogen and carbon monoxide. The combustion characteristics such as combustion instability, NOx and CO emission, temperatures at turbine inlet, liner and dump plane, and flame structure were investigated when changing when changing $H_2:CO$ ratio, dilution ratio, and $CH_4:syngas$ ratio. From the results, quantitative relationships are derived between key aspects of combustion performance, notably NOx emission. It is concluded that NOx emission of syngas is strongly influenced by the diluent heat capacity and combustion instability. Moreover, NOx control method using diluents such as $N_2$, $CO_2$, steam is verified.

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