• Title, Summary, Keyword: fuel staged combustion

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An Experimental Study on the Combustion Characteristics in Low Emission Multi-Staged Oil Burner (다단연소를 이용한 저 NOx 버너의 연소특성에 관한 연구)

  • An, Guk-Yeong;Kim, Han-Seok;Jo, Eun-Seong
    • 연구논문집
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    • pp.101-108
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    • 1997
  • The characteristics of combustion and emissions in multi-staged oil burner have been experimentally studied for the various range of equivalence ratios, drop sizes and fuel formulations. Malvern system was used to measure droplet size of fuel. Light fuel oil and light fuel oil doped with pyridine($C_5H _5N$) were used to investigate the effects on fuel NOx emission. The emissions of NO and CO in exhaust gas and the flame temperatures were measured by the gas analyzer and thennocouples. NOx emissions were increased by increasing the excess air ratio (range:$lambda=1.1-1.4$) or decreasing the SMD of droplet in single-staged burner. In comparison with the single-staged burner, the emission of NOx in multi-staged burner was reduced by 50% but CO emission was slightly increased. It is found that multi-staged burner has a good capability in reducing thermal NOx resulting from the distributed heat release rate and lower flame temperature in fuel-rich and fuel-lean combustion zone. Moreover, the fuel NOx emission of the multi-staged burner is lower than that of single-staged burner, because multi-staged burner has fuel rich zone where fuel N is converted to $N_2$ more than NO. In 3-staged burner, the percentage of each stage combustion air have strong influence on emission characteristics. It is also found that NOx emission can be reduced by decreasing inner and outer air percentage or increasing middle air flow rate and CO emission is vice versa.

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Reduction of Nitrogen Oxide by Fuel Staged Technology on the Combustion of Gasification Fuel (가스화 연료 연소시 단계적 연료주입 기술에 의한 질소산화물 저감)

  • Chae, Jong-Seong;Jo, Seon-Hui;Jeon, Yeong-Nam
    • Journal of Korean Society for Atmospheric Environment
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    • v.14 no.2
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    • pp.107-116
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    • 1998
  • Coal gasification fuel has generally a lower calorific values than natural gas and also contains ammonia which is a main source of fuel NOx. Such a fuel is in need of the advanced technologies for the NOx reduction with higher combustion efficiency. Therefore fuel staged combustion was investigated for the fuel NOx control using a bench scale gas combustoi for the fuel NOx control. Parametric screening studies were performed with the variation of air ratio, retention length and reburning fuel. The NOx reduction efficiency was increased with an increase of total air ratio having optimum reburning air ratio differently, The Increased retention length of the reburning zone was preferable for NOx reduction. Hydrocarbonic reburning fuels like propane and butane were more effective for the NOx reduction efficiency than hydrogen fuel. The NOx concentration at exit was linearly increased according to the fuel-N the fuel.

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The experimental study on the NOx formation of fuel staged combustor (연료다단 연소기의 NOx 발생특성에 관한 실험적 연구)

  • Han, Ji-Woong;Ahn, Kook-Young;Kim, Han-Seok;Chung, Jin-Do
    • 한국연소학회:학술대회논문집
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    • pp.163-171
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    • 2001
  • The characteristics of NOx emission in multi fuel/air staged combustor have been experimentally studied. The design concept of multi fuel/air staged combustor is creation of two separate flame, a primary flame is act as a pilot Dame for the secondary combustion stage combustion zone, where most of fuel bums. Experiments were performed on a semi-industrial scale (thermal input 0.233 MW) in a laboratory furnace and Liquefied Petroleum Gas(LPG) was used as primary and secondary fuels. The study included parametric study to identify the optimum operating conditions which are primary/secondary fuel ratio, primary/secondary air ratio, primary swirl intensity and secondary swirl intensity for reducing NOx emission. The test demonstrated that NOx emission can be reduced by ${>}$70% in accordance with operating conditions.

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Combustion Characteristics of a Staged Burner for a Boiler (다단 연소 버너의 보일러 연소실에서의 연소 특성)

  • Ahn, Joon;Kim, Jong-Jin;Kang, Sae-Byul
    • 한국전산유체공학회:학술대회논문집
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    • pp.555-558
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    • 2008
  • The demand for a boiler with low NOx burner is increasing with the recent strict NOx regulation. Staged burner is a common low NOx burner to suppress the formation of thermal NOx by yielding local fuel rich and fuel lean condition. The staged burner gives fire with bigger frontal area and length compared with a conventional burner, which changes heat transfer characteristics in the combustion chamber. The heat transfer and exhaust gas characteristics has been studied in the present study for a 0.5 t/h class furnace type boiler adopting the staged burner. A numerical simulation has been conducted to clarify the detailed physics inside the combustion chamber.

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Investigation of NOx Formation Charateristics in Multi Air Staged Spray Combustor (공기 다단 분무연소기의 NOx 발생특성에 관한 실험적 연구)

  • Kim, Han-Seok;An, Guk-Yeong;Kim, Ho-Geun;Baek, Seung-Ok
    • 연구논문집
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    • pp.23-43
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    • 2001
  • An experimental investigation on the reduction of nitrogen oxide emission from swirling, turbulent diffusion flames was conducted using multi air staged combustor, The combustor utilizes swirler to dampen fuel/air mixing, allowing an extended residence time for fuel pyrolysis and fuel-N conversion chemistry in an locally fuel-rich environment prior to burnout. This process also allow to reduce thermal NOx formation to lessen the temperature of reaction zone. The aerodynamic process therefore emulates the conventional staged combustion process, but without the need for the physically separate fuel-rich and -lean stages. Parametric studies on the ratios of each staged air and droplet size were carried out the feasibility of fuel/air mixing for low NOx combustion with diesel and pyridine mixed diesel fuel oil.

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A Development of Environmental-friendly Burner with High Injection Velocity by Multi-staged Fuel-injection (환경친화형 연료분할-고속분사식 버너 개발)

  • Choo, Jae-Min;Ko, Young-Ki;Kim, Jong-Woo;Kim, Cheol-Min
    • 한국연소학회:학술대회논문집
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    • pp.148-155
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    • 2005
  • In this study, Development of 300,000kcal/hr high velocity Injection burner with fuel multi-stage was performed using experiments. The characteristics of NOx emission in multi fuel/air staged combustor have been experimentally studied. The design concept of multi fuel/air staged combustor is creation of two separate flame, a primary flame is largest access air combustion and the secondary flame is complete combustion zone, where most of fuel bums. Experiments were performed on an industrial scale in a laboratory furnace and Liquefied Natural Gas(LNG) was used as primary and secondary fuels. Comparison of outlet NOx and outlet Temperature under various air rate and primary/ secondary fuel ratio was performed. The test demonstrated that NOx emission con be reduced by 70% in accordance with operating conditions.

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An Experiment on Low NOx Combustion Characteristics in a Multi-Staged Burner (다단연소기를 이용한 저 NOx 연소특성 연구)

  • Cho, Eun-Seong;Sung, Yong-Jin;Chung, Suk-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.1
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    • pp.32-38
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    • 2003
  • Staged combustion, such as air- and fuel-staging, is a relatively well-known technique fur reduction of NOx emission and used in combination with other techniques nowadays. However, the design variables are still selected depending upon operating conditions. There are many variables tested to investigate the NOx emission characteristics fur changing of fuel or air velocity, swirl intensity, and staging ratio of air and fuel in multi-staged burner. In air-staging case, the fuel-rich condition of the primary combustion zone is very helpful to reduce NOx emission and its range is known to be restricted by the increase of carbon monoxide. However, in many cases carbon monoxide level is not too high to be restricted operating condition. So we tried to expand the equivalence ratio range to the richer condition in the primary combustion zone and certificate the function of each burner component and its contribution to the overall NOx production.

An Experimental Study on the NOx Formation of Fuel Staged Combustor (연료다단 연소기의 NOx 발생특성에 관한 실험적 연구)

  • 정진도;안국영;한지웅
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.73-79
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    • 2003
  • The characteristics of NOx emission in multi fuel/air staged combustor have been experimentally studied. The design concept of multi fuel/air staged combustor is creation of two separate flame, a primary flame is act as a pilot flame for the secondary combustion stage combustion zone, where most of fuel burns. Experiments were performed on a semi-industrial scale (thermal input 0.233 ㎿) in a laboratory furnace and Liquefied Petroleum Gas(LPG) was used as primary and secondary fuels. The study included parametric study to identify the optimum operating conditions which are primary/secondary fuel ratio, primary/secondary air ratio, primary swirl intensity and secondary swirl intensity for reducing NOx emission. The test demonstrated that NOx emission can be reduced by >70% in accordance with operating conditions.

An Experimental Study on the NOx Formation of LNG Flame in Fuel Staged Combustor (다단 연소기를 이용한 LNG 화염의 NOx 발생에 관한 실험적 연구)

  • Chung, Jin-Do;Han, Ji-Woong;Ahn, Kook-Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.4
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    • pp.389-394
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    • 2004
  • An experimental study on the NOx formation of LNG flame in fuel staged combustor has been studied. The design concept of multi fuel/air staged combustor is creation of two separate flame, a primary flame is a act as a pilot flame for the secondary combustion stage combustion zone, where most of fuel bums. Experiments were performed on a semi-industrial scale (thermal input 0.233 MW) in a laboratory furnace and Liquefied Natural Gas(LNG) was used as a primary and secondary fuels. This study included parametric study to identify the optimum operating conditions which are primary/secondary fuel ratio, and primary/secondary air ratio for reducing NOx emission with two types of nozzle. The test demonstrated that NOx emission can be reduced by >70% in accordance with operating conditions.

Eco-machinery Engineering Technology for Reducing NOx Emission (질소산화물과 관련한 환경기계기술)

  • Ahn, Kook-Young;Kim, Han-Seok;Cha, Min-Seok;Lee, Jin-Wook
    • 한국연소학회:학술대회논문집
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    • pp.301-310
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    • 2003
  • Eco-Machinery engineering technologies in KIMM for reducing NOx emission were introduced. Combustion technologies such as reburning and fuel staged or air staged combustion have been applied to reduce NOx emission in the field of boiler furnaces. Lean premixed combustion method have been studied in gas turbine combustor. Hybrid system with plasma and SCR being considered as prospective method of De-NOx has been developed. Also, low NOx technologies including common rail system, EGR and DPF in diesel engine have been investigated.

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