• Title/Summary/Keyword: Cylindrical-type Combustor

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Development of Catalytic Combustion Boiler in Domestic Use (가정용 촉매연소 보일러 개발)

  • Kim, Ho-Yeon;Lee, Seung-Ho;Cho, Won-Ihl;Baek, Young-Soon
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.677-682
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    • 2001
  • Catalytic combustion is the environmental-friendly technology, which has been applied to a variety of areas for industrial and domestic use in recent years. Accordingly, this study performed the development of the catalytic manufacturing technology for the high temperature and of the catalytic combustor in priority, which were aimed to be applied to a commercialized boiler. Paliadium(Pd) of a noble metal was used as a catalyst for the high temperature and supported on alumina($Al_[2}O_{3}$) and zirconia($ZrO_{2}$) in constant weight ratio. Activity of Pd catalysts is compared and analyzed in the catalytic combustion of natural gas. The ratio of $Pd/Al_{2}O_{3}=4$ was found to be better than any other weight ratios in activity and durability. The performance examination of catalysts and of combustion through the plate-type combustor made it possible to be developed the cylindrical-type combustor which has increased combustion area. Catalytic combustion boiler of 25,000 kcal/hr class was also developed, which had the optimum combustion condition at the nozzle of 5.95mm and the orifice of 21mm. This condition was determined through the performance experiments of catalytic combustion boiler to which the cylindrical-type catalytic combustor was applied.

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Development of the Catalytic Combustion Condensing Boiler of Lower Emission Type for Domestic Use (저공해형 촉매연소식 소형 콘덴싱보일러 개발)

  • Kim Hoyeon;Lee Seungho;Cho Wonihl;Baek Youngsoon
    • Journal of the Korean Institute of Gas
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    • v.5 no.1
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    • pp.45-51
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    • 2001
  • Catalytic combustion is the environmental-friendly technology, which has been applied to a variety of areas for industrial and domestic use in recent years. Accordingly, this study performed the development of the catalytic manufacturing technology for the high temperature and of the catalytic combustor in priority, which were aimed to be aimed to a commercialized condensing boiler. Palladium(Pd) of a noble meta] was used as a catalyst for the high temperature and supported on $alumina(Al_{2}O_{3})\;and\;zirconia(ZrO_2)$ in constant weight ratio. Activity of Pd catalysts is compared and analysed in the catalytic combustion of natural gas. The ratio of $Pd/Al_{2}O_{3}\;=\;4$ was found to be better than any other weight ratios in activity and durability. The performance examination of catalysts and of combustion through the plate-type combustor made it possible to be developed the cylindrical-type combustor which has increased combustion area. Catalytic combustion condensing boiler of 25,000 kcal/hr class was also developed, which had the optimum combustion condition at the no221e of 5.95mm and the orifice of 21mm. This condition was determined through the performance experiments of catalytic combustion condensing boiler to which the cylindrical-type catalytic combustor was applied.

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Experimental Study of Thermo-Flow Field in a Model Gas Turbine Combustor with Various Swirl Conditions (스월변화에 따른 모형 가스터빈 연소기의 열유동장의 실험적 연구)

  • Ryu, Song-Youl;Koo, Ja-Ye
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.4
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    • pp.70-76
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    • 2002
  • Characteristics of kerosine spray combustion were investigated at various swirl condition. PDPA(Phase Doppler Particle Analysis) was used to measure the droplet sizes and velocities. R-type(Platinum vs. Platinum-13%rhodium) thermocouple was used to measure the temperature of combustion flow field inside model combustor. A visualization of spray and flame was performed with still camera. As swirl number increases due to increase of swirl vane angle, the spray and the flame were developed to radial direction rapidly. When swirl number is small, the configuration of flame is cone type, but swirl number is large, the configuration of flame is cylindrical type due to enhanced mixing by the transport of swirl momentum.

The Efficiency Prediction for Plate Type Steam Reformer with Shape Change of Combustion Chamber (평판형 STR의 연소공간 형상변화에 따른 성능 예측)

  • Kim, Hun-Ju;Lee, Ji-Hong;Lee, Myeong-Yong;Lee, Sang-Seok;Lee, Do-Hyung
    • Journal of Hydrogen and New Energy
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    • v.21 no.4
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    • pp.286-294
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    • 2010
  • According to the propagation of fuel cell system, the importance of that system efficiency is being magnified. Thus, the efficiency improvement of reformer which is the important part of fuel cell system will be required. In structural aspect, the reformer is classified into cylindrical and plate type. Plate type reformer features better maintenance and space efficiency compared with cylindrical type. In this study, we changed the shape of combustion chamber to improve the reforming efficiency. And then we performed the CFD simulation to predict the spacial distribution of temperature. Analysis cased contains with baffles, fins, baffles and fins, and without those. In case of only with-baffle, temperature distributions were uneven because the high temperature stream was concentrated near the baffle end. In case of with-fin, the temperature distributions were relatively even than other cases.

Numerical Study on Characteristics of Low-Frequency Noise in a Cylindrical Combustor (원통형 연소기 내의 저주파 소음특성에 관한 수치적 연구)

  • 김재헌;이수갑
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.492-497
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    • 1998
  • Thermoacoustic oscillation is a significant problem in cylindrical-type combustors such as common internal combustion engines, industrial furnaces, gas turbine, etc. This kind of low frequency oscillation can give rise to serious troubles such as the destruction of system or producing of a strong noise. Accurate numerical simulation of thermoacoustic phenomena is a complex and challenging problem. Especially, considering the reaction of mixture intensifies the difficulty of analysis. Like as other simulations of the aerodynamics and aeroacoustics, direct computation of thermoacoustic phenomena requires that the Navier-Stokes equations be solved using accurate numerical differentiation and time-marching schemes, with non-reflecting boundary conditions. In this study,, numerical approach aims at qualitative analysis and efficient prediction of problem, not at the development of an accurate scheme. Overally speaking, numerical prediction is reasonably matched with experimental result.

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Prediction of Thermo-acoustic Oscillation Characteristics in a Ducted Combustor (관형 연소기의 열-음향 진동에 의한 소음 특성 예측)

  • 김재헌;이정한;이수갑;정인석
    • The Journal of the Acoustical Society of Korea
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    • v.18 no.7
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    • pp.56-66
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    • 1999
  • Thermoacoustic oscillation is a significant problem in cylindrical-type combustors such as common internal combustion engines, industrial furnaces, gas turbine, etc. This kind of low frequency oscillation can lead to serious consequences such as destruction of the combustor and production of strong noise. The accurate numerical simulation of thermoacoustic phenomena is a complex and challenging problem, especially when considering the chemical reaction of mixtures. As with other simulations of aerodynamics and aeroacoustics, the direct computation of thermoacoustic phenomena requires that Navier-Stokes equations be solved using accurate numerical differentiation and time-marching schemes, with non-reflecting boundary conditions. The numerical approach used here aims at qualitative analysis and efficient prediction of those problems, not at the development of an accurate scheme. The numerical prediction developed in this work is shown to be reasonably matched with experimental result.

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