• Title/Summary/Keyword: Fuel Lean Reburning

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Experimental Study on NOx Reduction and CO Emission by Fuel Lean Reburning Process (연료 희박 재연소 과정에 의한 NOx 저감 및 CO 발생에 대한 실험적 연구)

  • Lee, Chang-Yeop;Kim, Hak-Young;Baek, Seung-Wook;Kim, Se-Won
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.3
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    • pp.216-223
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    • 2008
  • Reburning is a useful technology in reducing nitric oxide through injection of a secondary hydrocarbon fuel. In this paper, an experimental study has been conducted to evaluate the effect of fuel lean reburning on $NO_X/CO$ reduction in LPG flame. Experiments were performed in flames stabilized by a co-flow swirl burner, which was mounted at the bottom of the furnace. Tests were conducted using LPG gas as the reburn fuel as well as the main fuel. The effects of reburn fuel fraction and injection location of the reburn fuel were studied when the fuel lean reburning system was applied. The paper reports data on flue gas emissions and temperature distribution in the furnace for a wide range of experimental conditions. At steady state, temperature distribution and emission formation in the furnace have been measured and compared. This paper makes clear that in order to decrease both NOx and CO concentrations in the exhaust when the fuel lean reburning system was adapted, it is important that the control of some factors such as initial equivalence ratio, reburn fuel fraction and temperature of reburn fuel injection region. Also it shows the fuel lean reburning is also effective method to reduce NOx as much as reburning.

Experimental and Numerical Investigation for NOx Reduction with Fuel Lean Reburning System (NOx저감을 위한 연료희박 재연소 기법의 실험 및 수치적 연구)

  • Kim, Hak-Young;Baek, Seung-Wook;Son, Hee;Kim, Se-Won
    • Journal of the Korean Society of Combustion
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    • v.14 no.2
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    • pp.18-25
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    • 2009
  • Fuel lean reburning method is very attractive way in comparison with conventional reburning method for reducing NOX. Meanwhile, the knowledge of the how flue gas re-circulated, temperature distribution and species concentration is crucial for the design and operation of an effective fuel lean reburning system. For this reason, numerical analysis of fuel lean reburning system is a very important and challenge task. In this work, the effect of fuel lean reburn system on NOX reduction has been experimentally and numerically conducted. Experimental study has been conducted with a 15kW lab scale furnace. Liquefied Petroleum Gas is used as main fuel and reburn fuel. To carry out numerical study, the finite-volume based commercial computational fluid dynamics (CFD) code FLUENT6.3 was used to simulate the reacting flow in a given laboratory furnace. Steady state, three dimensional analysis performed for turbulent reactive flow and radiative heat transfer in the furnace.

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Experimental Investigation of NOX Reduction using a Hybrid Fuel Lean Reburning System (NOx 저감을 위한 하이브리드 연료희박 재연소 연구)

  • Kim, Hak-Young;Baek, Seung-Wook;Hwang, Chang-Hwan
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.3
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    • pp.283-290
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    • 2010
  • The main goal of this study is to examine the use of a hybrid -fuel lean reburning system with air staging for $NO_X$ reduction. The experimental variables include the reburn fuel fraction, sizes of reburn- fuel-injection nozzles, oxygen enrichment ratio, and location of reburn- fuel- injection. The effect of the flow field induced by air- staging combustion on $NO_X$ reduction is considered, and then, the $NO_X$ reduction rate is compared with only fuel lean reburning system. On the basis of the effectiveness of each De-$NO_X$ process, the advantage of using the hybrid reburning system with air staging is determined and discussed.

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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    • 2003.05a
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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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An Experimental Study on the Combustion Characteristics of a Low NOx Burner Using Reburning Technology

  • Ahn, Koon-Young;Kim, Han-Seok;Son, Min-Gyu;Kim, Ho-Keun;Kim, Yong-Mo
    • Journal of Mechanical Science and Technology
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    • v.16 no.7
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    • pp.950-958
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    • 2002
  • The combustion characteristics of a low NOx burner using reburning technology have been experimentally studied. The return burner usually has three distinct reaction zones which include the primary combustion zone, the reburn zone and the burnout zone by provided secondary air. NOx is mainly produced in a primary combustion zone and a certain portion of NOx can be converted to nitrogen in the rebury zone. In the burnout zone, the unburned mixtures are completely oxidated by supplying secondary air. Liquefied Petroleum Gas (LPG) was used as main and reburn fuels. The experimental parameters investigated involve the main/reburn fuel ratio, the primary/secondary air ratio, and the injection location of rebury fuel and secondary air. When the amount of return fuel reaches to the 20-30% of the total fuel used, the overall NO reduction of 50% is achieved. The secondary air is injected by two different ways including vertical and parallel injection. The injector of secondary air is located at the downstream region of furnace for a vertical-injection mode, which is also placed at the inlet primary-air injection region for a parallel-injection mode. In case of the vertical injection of the secondary air flow, the NOx formation of stoichiometric condition at a primary combustion zone is nearly independent of the rebury conditions (locations, fuel/air ratios) while the NOx emission of the fuel-lean condition is considerably influenced by the reburn conditions. In case of the parallel injection of the secondary air, the NOx emission is sensitive to the air ratio rather than the fuel ratio and the reburning process often coupled with the multiple air-staging and fuel-staging combustion processes.