• Title/Summary/Keyword: 예혼합형 버너

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A Study on the Combustion Characteristics of Flat-Plate Premixed Burner for Various Flame Surface Media and Heat Exchangers (평판형 예혼합 버너의 다양한 화염면 매질 및 열교환기에 따른 연소 특성)

  • Cho, Eun-Seong;Park, Chang-Kwon;Choi, Kyung-Suhk
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.10
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    • pp.1033-1040
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    • 2011
  • The premixed burner is a very strong candidate for using household boiler burner system because it has high efficiency, low emission and can be used in compact boiler system. Usually, household boiler burner systems use a Bunsen burner, which consists of an inner rich premixed flame and fuel burned completely by a secondary air supply. It has a relatively long flame length and operates in a high excess of air, so it is difficult to fit such a burner into a high efficiency compact boiler. In this paper, the characteristics of a premixed combustion burner for surface media such as metal fiber, ceramic, and SUS fin were evaluated. In particular, the flow velocity over the burner surface for the cold flow characteristics of the surface material were measured and adjusted. The combustion tests were carried out by taking pictures of the flame and measuring the flame temperature. The amounts of CO and NO were measured and the characteristics of the surface burner materials, combustion chamber, and heat exchangers were evaluated for various excess air ratios and heating values.

Effects of Combustion Characteristics of the Burners for Non-Oxidizing Direct Fired Furnaces on the Oxidization of the Surface of Steel Plate (무산화 직화로 버너의 연소특성이 강재표면의 산화에 미치는 영향)

  • Park, Heung Soo;Riu, Kap Jong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.23 no.3
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    • pp.330-341
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    • 1999
  • An experimental study for the two types of burners used in the non-oxidizing direct fired furnaces of the heat treatment process for the cold rolled plate has been carried out to investigate the combustion characteristics and the oxidization of the surface of steel plate. A steep temperature gradient and entrainment of residual oxygen were found near the heating surface in the flame of the nozzle mixing burner which has strong swirl velocity component. It was concluded that the elimination of the residual oxygen and the increase of the temperature of combustion gas on the heating surface are needed to enhance the performance of the burners for application to the non-oxidizing direct fired furnaces.

Combustion Characteristics of Cylindrical Premixed Burner using Different Baffle Plate and Flame Holes (분포판 및 염공변화에 따른 원통형 예혼합 버너의 연소 특성)

  • Lee, Pil Hyong;Hwang, Sang Soon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.7
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    • pp.350-359
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    • 2017
  • Premixed burner is a very strong candidate in household condensing gas boiler burner system because it has low CO and NOx emission with high thermal efficiency. The objective of this study was to determine combustion characteristics of cylindrical premixed burner using different baffle plate and flame holes. Results showed that cylindrical premixed flame mode could be changed into lift-off flame, blue flame, red flame, and green flame with increasing equivalence ratio. In particular, blue flame was found to be very stable at heating load of 8,82~35,280 kcal/h. NOx emission was under 26 ppm between 0.775 to 0.813 of equivalence ratio. CO emission was under 58 ppm under the same equivalence ratio. Thermal efficiency, a very important index in condensing gas boiler, was found to be above 90.13% under the same equivalence region.

The Optimization of Cylindrical Perforated Burner for Condensing Gas Boiler (콘덴싱 가스보일러용 원통형 다공버너의 최적화 연구)

  • 이창언;장기현;이강주;정영식
    • Journal of Energy Engineering
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    • v.11 no.1
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    • pp.10-17
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    • 2002
  • The objective of performing this study is to develop low emission condensing gas boiler. To reduce NOx and CO, three reasonable distances between burner and heat exchanger were decided through the experiments of model plane burner. Three burners with different diameter were made and then emission characteristics were examined. The optimum burner geometry was determined from flame stability, pollutant emission characteristics and applicability to the practical boiler system. In the domain of equivalence ratio 0.68~0.85, turn-down ratio of the burner designed by this research was extended to a wider range of 5 : 1. Thermal efficiency of the boiler developed by this study reached to 97% (LHV basis) of heating water efficiency at heating load of 20,000 kcal/hr when fueled by both of LNG or LPG. Emission ($O_2$=0%, wet basis) of NOx and CO concentration was 26 ppm and 85 ppm when fueled by LNG, 41 ppm and 113 ppm when fueled by LPG respectively.

Characteristics of Combustion and Thermal Efficiency for Premixed Flat Plate Burner Using a Porous Media (다공성 소재 종류에 따른 예혼합 평판버너의 연소 및 열효율 특성에 관한 연구)

  • Kum, Sungmin;Yu, Byeonghun;Lee, Chang-Eon;Lee, Seungro
    • Journal of Energy Engineering
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    • v.21 no.4
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    • pp.385-392
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    • 2012
  • The purpose of this study is investigated on the combustion and the thermal characteristics of porous media burners which are many using for a condensing boiler recently. In addition, results of this study will be used the fundamental information to decide the burner type which will be applied to the future development of EGR(Exhaust gas recirculation) condensing boiler. Two flat type of burners made of a the metal fiber(MF) and the ceramic(CM) were selected and examined, experimentally. As experimental results, the emitted CO concentration of CM was higher than that of MF. However, the NO concentration of MF was higher than that of CM. The efficiencies of both burners were increased as increasing the burner capacity. While the efficiency of MF was higher than that of CM, regardless of the burner capacity. In the experimental range, MF is appropriated for the burner material and 0.8 of equivalence ratio is an optimal operation condition, regarding of the proportional control, the thermal efficiency and emitted NO and CO concentration based on the regulations of KS B standard and EN 677 standard.

The Study on the Optimization of Premixed Gas Burner and Heat Exchanger (예혼합 가스버너와 열교환기의 최적화 연구)

  • Lee Kang Ju;Jang Gi Hyun;Lee Chang Eon
    • Journal of the Korean Institute of Gas
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    • v.7 no.4 s.21
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    • pp.7-13
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    • 2003
  • This study was carried out to optimize premixed burner and heat exchanger of the condensing gas boiler which can save energy by utilizing latent heat of combustion gas and reduce pollutant in exhaust gas. The heat exchanger of the gas boiler was composed of three parts, which were an upper, lower, and coil heat exchanger. The upper heat exchanger was placed outside of the premixed burner and a lower heat exchanger was located under the upper heat exchanger. And, coil heat exchanger rounded the outer surface of an upper and lower heat exchanger. The boiler designed by this research reaches turn-down ratio 4:1 in the domain of equivalence ratio 0.75${\~}$0.8 and thermal efficiency of $97\%$. Emission of NOx and CO concentration was under 20ppm and 140ppm at equivalence ratio 0.8. When diameter of the burner is replaced from 60mm to 50mm, emission of CO was reduced about 50ppm remarkably.

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Effect of $CO_2$ dilution on Combustion Instabilities in dual premixed flame (이중 예혼합화염에서 $CO_2$ 희석이 연소불안정에 미치는 영향)

  • Lee, Kang-Yeop;Kim, Hyung-Mo;Park, Poo-Min;Hwang, O-Sik;Yang, Soo-Seok;Ko, Young-Sung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.763-768
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    • 2011
  • The effects of $CO_2$-dilution on combustion instability were studied in order to apply biogas in a dual lean premixed gas turbine combustor on a real-scale dual lean premixed burner head which is originally developed for Natural Gas fuel. Combustion instability is reduced by $CO_2$ dilution effect according to the result of dynamic pressure signal and phase-resolved $OH^*$ images. The reason for this is that dilution of $CO_2$ reduces heat release perturbation and increases flame volume due to reduction of the flame speed and expansion of flame surface.

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연소진단 용 광대역 코헤런트 반 스톡스 라만 분광기의 제작 및 정확도 분석.

  • Park, Cheol-Ung;Park, Seung-Nam;Han, Jae-Won;Park, Bu-Min;Sin, Hyeon-Dong
    • 한국연소학회:학술대회논문집
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    • 1997.06a
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    • pp.33-44
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    • 1997
  • 연소상태의 온도를 이동하면서 측정할 수 있는 광대역 코헤런트 반스톡스 라만 분광기를 제작하였다. 분광기의 온도 측정 정확도를 향상시키기 위하여 무모드레이저를 제작하여 스톡스광으로 사용하였다. 이동형 CARS 분광기에 적합하도록 CARS신호 측정용 단색기를 제작하여 분광기 내부에 설치 하였다. CARS 분광기의 온도 측정의 정확도를 알아보려고 흑연관 전기로를 이용하여 표준 복사온도계와 CARS 분광기로 측정한 온도의 차이를 측정하였다. 장치의 온도 정확도는 1000 K - 2400 K 사이의 온도영역에서 2%이내 였다. 무모드 색소레이저의 출력 스펙트럼의 시간에 따른 안정도를 측정하여 온도측정에 미치는 오차를 조사한 결과 1500 K에서 5 시간 동안 1.5 %이내 였다. 평면 화염 버너에서 프로판공기 예혼합 화염의 온도 분포를 측정하여 이 장치의 응용 가능성을 확인하였다.

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Effect of Pressure and Stoichiometric Air Ratio on NOx Emissions in Gas-Turbine Dump Combustor with Double Cone Burner (이중원추형 모형연소기에서 압력과 공기비에 따른 NOx 배출특성)

  • Nam, Dong-Hyun;Nam, Hyun-Su;Han, Dong-Sik;Kim, Gyu-Bo;Cho, Seung-Wan;Kim, Han-Suk;Jeon, Chung-Hwan
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.3
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    • pp.251-257
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    • 2012
  • This work presents an experimental investigation of NOx emissions according to inlet air temperature (550-660 K), stoichiometric air ratio (${\lambda}$, 1.4-2.1), and elevated pressure (2-5 bar) in a High Press Combustor (HPC) equipped with a double cone burner, which was designed by Pusan Clean Coal Center (PC3). The exhaust-gas temperature and NOx emissions were measured at the end of the combustion chamber. The NOx emissions generally decreased as a function of increasing ${\lambda}$. On the other hand, NOx emissions were influenced by ${\lambda}$, inlet air temperature and pressure of the combustion chamber. In particular, when the inlet air temperature increased, the flammability limit was extended to leaner conditions. As a result, a higher adiabatic temperature and lower NOx emissions could be achieved under these operation conditions. The NOx emissions that were governed by thermal NOx were greatly increased under elevated pressures, and slightly increased at sufficiently low fuel concentrations (${\lambda}$ >1.8).