• 제목/요약/키워드: Flat Flame Burner

검색결과 30건 처리시간 0.028초

단일 프레임 이중 노출법을 이용한 Flat Flame Burner의 유동장 특성에 관한 연구 (Flowfield Characteristic of a Flat Flame Burner using One Frame Double Exposure Method)

  • 정용기;전충환;장영준
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2000년도 추계학술대회논문집B
    • /
    • pp.692-697
    • /
    • 2000
  • Recently, Flat flame burners are hilighted in high-load burners. Our study contains flow field analysis of a flat flame burner. In this paper, We analyzed the direction and magnitude of the velocity in a round tile type burner with swirl angles, $10^{\circ},\;30^{\circ},\;50^{\circ}$. In the case of swirl angle $10^{\circ}$, because axial momentum is larger than radial momentum, Recirculation region was weakly developed. In the case of swirl angle $50^{\circ}$, Flow in front of the tile is distributed for radial direction. And Recirculation region is large. So, We expect that the radiation can be transmitted from tiles and the recirculation region may cause $NO_x$ reduction.

  • PDF

선회도에 따른 평면 화염 버너의 유동특성 (The Effect of Swirl Number on the Flow Characteristics of Flat Flame Burner)

  • 장영준;정용기;전충환
    • 대한기계학회논문집B
    • /
    • 제25권7호
    • /
    • pp.997-1004
    • /
    • 2001
  • Burner of Flat Flame type expects the uniform flame distribution and NOx reduction. The characteristics of Flat Flame Burner become different according to swirl number in the burner throat. Experiments were focused on swirl effect by four types of swirler with different swirl numbers (0, 0.26, 0.6 and 1.24). It shows many different flow patterns according to swirl number using PIV(Particle Image Velocimetry) method. The flow of burner with swirler is recirculated by pressure difference between its center and outside. Recirculated air makes stable in flame, and reduced pollutant gas. In case of swirl number 0, main flow passes through axial direction. As swirl number increased, The backward flow develops in the center part of burner and Flow gas recirculates. This is caused by radial flow momentum becomes larger than axial flow by swirled air and the pressure at center drops against surrounding. As swirl number increases, the radial and axial velocity was confirmed to be larger than low swirl numbers. And turbulence intensity have similar pattern. The CTRZ(Central Toroidal Recirculation Zone) is shown evidently when y/D=1 and S=1.24. The boundary-layer between main flow and recirculated flow is shown that the width is seen to be decreased as swirl number increased.

평면화염 버너의 선회유동 및 연소특성에 관한 실험적 연구 (An Experimental Study on the Swirled Flow Pattern and Combustion Characteristics in the Flat Flame Burner)

  • 김철민;최수진;전충환;장영준
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2000년도 추계학술대회논문집B
    • /
    • pp.686-691
    • /
    • 2000
  • The flat flame made by swirling air has lots of the different characteristics according to the swirl numbers in the burner throat. Its combustion characteristics are also affected by them. In this study, the flow patterns in the flat flame burner which is no firing condition were investigated experimentally with using smoke in terms of each swirl number. Also the blow off, flame structure, temperature distribution and NO emission in the firing condition were measured at the atmosphere and combustion furnace.

  • PDF

평판 예혼합 세라믹 버너의 분포판 변화에 따른 연소화염특성과 안정성 분석 (Combustion Characteristic and Stability of Flat Premixed Ceramic Burner with Different Porous Baffle Plates)

  • 이재영;이필형;박창수;박봉일;황상순
    • 한국연소학회지
    • /
    • 제14권4호
    • /
    • pp.7-16
    • /
    • 2009
  • Porous metal plates (Metal fiber, muti-hole metal plate) using mainly in surface burner are known to have a corrosion and durability problem under high temperature condition. In this study, premixed flat flame with perforated ceramic tile of more durable cordierite material was examined with respect to combustion stability and emission. The flat premixed ceramic burner consists of perforated ceramic tile and various type of baffle plates to form stable surface flame. The results show that most stable flat flame is generated using baffle plate with open ratio of 0.193. In downward flat flame mode which is widely used in condensing boiler, CO is measured below 50ppm from equivalence ratio 0.755 to 0.765 and $NO_X$ is measured below 12ppm from equivalence ratio 0.75 to 0.79. It is also found that the range of blue flame in flame stability curve becomes wider with increasing heat capacity.

  • PDF

Flat Flame Burner의 유동과 연소 특성에 관한 연구 (A Study on Flow and Combustion Characteristics of Flat Flame Burner)

  • 정용기;김철민;전충환;장영준
    • 한국연소학회:학술대회논문집
    • /
    • 한국연소학회 2000년도 제21회 KOSCO SYMPOSIUM 논문집
    • /
    • pp.59-66
    • /
    • 2000
  • In this study, We studied flow and combustion characteristics of a Flat Flame Burner(FFB) with swirler. As swirl number increase, the streamlines is proceed close to tile and velocity is large. Blow-off limit decrease when swirl number is 1.24, but blow-off limit increase when combustion load is 6500kcal/hr. Temperature distribution is uniform in front of tile and NO formation is small at S=1.24. We expect that the radiation can be transmitted to the object and NOx will reduce because of recirculation zone

  • PDF

난류예혼합 플랫버너의 유동해석과 화염구조 (The Flow analysis and the Flame structure of Turbulent Premixed Flat Burner)

  • 김헌주;윤봉석;허수빈;박재민;이도형
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제35권4호
    • /
    • pp.397-405
    • /
    • 2011
  • 친환경 대체에너지의 한 분야인 수소에너지는 물의 전기분해와 화석연료의 개질을 통해 얻어 진다. PEMFC용 개질기에 적용 가능한 난류예혼합 방식의 메탈화이버 플랫버너를 제작하였다. 공급열 량에 따른 연소영역의 평균온도분포와 CO, HC, $CO_2$$O_2$등 각종 화학종의 평균농도로 플랫버너의 화염구조 및 특성을 조사하여 개질기 적용 가능성을 확인하였다. 그리고 PIV 유동실험결과와 유동수 치해석 결과를 비교 분석하여 차후 PEMFC용 개질기 개발에 있어 수치해석을 적용하기 위한 기초연구를 진행하였다.

선회도가 평면화염버너의 유동과 연소 특성에 미치는 영향 (The Effect of Swirl Intensity on Flow and Combustion Characteristics of Flat Flame Burner)

  • 정용기;김경천;전충환;장영준
    • 대한기계학회논문집B
    • /
    • 제26권2호
    • /
    • pp.336-344
    • /
    • 2002
  • In this study, the flow and combustion characteristics of flat flame burner with twirler were investigated. There are several factors that define the characteristics of burner. Among them, the experiments was focused on swirl effect by four types of twirler in terms of flow structure, distribution of temperature and emission characteristics. In PIV(Particle Image Velocimetry) experiment, the less of swirl number, axial flow is dominant at the center. As swirl number increases, the flow develops along the burner tile and backward flow becomes stronger at center. From the combustion characteristics, as long as combustion load increases, blow-off limit was improved. But at the higher swirl number, the limit is decreased. At swirl number 0, the temperature is shown typical distribution of long flame burner. but swirl number increases, the temperature distribution is uniform in front of round tile. Therefore, the temperature distribution is coincided with flow structure. As excess air ratio increases, NO concentrations are high. But high swirl number gives rise to become low NO concentrations. The flame characteristics are comprised in wrinkled laminar-flame regime according to turbulence Reynolds number(Rel) and Damkohler number(Da).

난류 비예혼합 평면화염의 유동과 연소 특성 (The Characteristics of the Flow and Combustion in a Turbulent Non-Premixed Flat Flame)

  • 곽지현;정용기;전충환;장영준
    • 대한기계학회논문집B
    • /
    • 제27권4호
    • /
    • pp.447-457
    • /
    • 2003
  • An experiment in a turbulent non-premixed flat flame was carried out in order to investigate the effect of swirl number on the flow and combustion characteristics. First. stream lines and velocity distribution in the flow field were obtained using PIV method. In contrast with the axial flow without swirl, highly swirled air induced stream lines along the burner tile. and backward flow was caused by recirculation in the center zone of the flow field. In the combustion. the flame with swirled air also became flat and stable along the burner tile with increment of the swirl number. Flame structure by measuring OH and CH radicals intensity and by calculating Damkohler number(Da) and turbulence Reynolds number(Re$_{T}$) was examined. It appeared to be comprised in the wrinkled laminar-flame regime. Backward flow by recirculation of the burned gas decreased the flame temperature and emissions concentrations as NO and CO. Consequently, the stable flat flame with low NO concentration was achieved.d.

메탈화이버를 이용한 플랫 버너의 연소특성에 관한 연구 (A Study on the Combustion Characteristics of Flat Burner using Metal Fiber)

  • 이진석;이용후;윤봉석;이도형
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2002년도 학술대회지
    • /
    • pp.275-278
    • /
    • 2002
  • The purpose of this study is to investigate the combustion characteristics of the flat burner using metal fiber. By changing the excess air ratio which affects strongly to the combustion characteristics, the flame stability range in the metal fiber were found and the range of the blue flame mode and radiant mode were distinguished and $NOx\;and\;O_{2}$ distributions in combustor were measured at two conditions which represents the blue flame mode and radiant mode.

  • PDF

Effects of a Swirling and Recirculating Flow on the Combustion Characteristics in Non- Premixed Flat Flames

  • Jeong, Yong-Ki;Jeon, Chung-Hwan;Chang, Young-June
    • Journal of Mechanical Science and Technology
    • /
    • 제18권3호
    • /
    • pp.499-512
    • /
    • 2004
  • The effects of swirl intensity on non-reacting and reacting flow characteristics in a flat flame burner (FFB) with four types of swirlers were investigated. Experiments using the PIV method were conducted for several flow conditions with four swirl numbers of 0, 0.26, 0.6 and 1.24 in non-reacting flow. The results show that the strong swirling flow causes a recirculation, which has the toroidal structures, and spreads above the burner exit plane. Reacting flow characteristics such as temperature and the NO concentrations were also investigated in comparison with non-reacting flow characteristics. The mean flame temperature was measured as the function of radial distance, and the results show that the strong swirl intensity causes the mean temperature distributions to be uniform. However the mean temperature distributions at the swirl number of 0 show the typical distribution of long flames. NO concentration measurements show that the central toroidal recirculation zone caused by the strong swirl intensity results in much greater reduction in NO emissions, compared to the non-swirl condition. For classification into the flame structure interiorly, the turbulence Reynolds number and the Damkohler number have been examined at each condition. The interrelation between reacting and non-reacting flows shows that flame structures with swirl intensity belong to a wrinkled laminar-flame regime.