• 한국연소학회:학술대회논문집
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• 한국연소학회 2002년도 제25회 KOSCI SYMPOSIUM 논문집
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• pp.105-112
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• 2002

The objective of this research is to determine generally applicable design principles for the development of internally staged combustion devices. Utilizing a triple annulus combustor, air staged commercial propane flame configuration are studied. For this triple air staged combustor, the angular momentum weighted by it's swirl number and air distribution ratio was observed to be the critical criteria. An internal recirculation zone which develops on the centerline of the flame immediately downstream of the burner entraps the fuel into a fuel rich eddy. Then sufficient heat must he transferred from the flame via radiation to the chamber heat transfer surfaces, such that when the second air is introduced, peak flame temperatures are suppressed. It is experimentally found out that the total NOx emission level in this type of burner is lower than 0.75g/kg.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2001년도 제23회 KOSCO SYMPOSIUM 논문집
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• pp.153-160
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• 2001

The combustion test used DTF was performed to obtain the characteristics of NOx emission and reduction. In this test, major factor of NOx emission was a stoichiometric air ratio. At the onset of combustion to be rich oxygen, NOx was produced rapidly. Optimum condition for NOx reduction was formed under about AR:0.7 in the combustion test of Alaska coal. Investigations were undertaken with 200KW(th) test combustor. In combustion test, the major variables were coal feed ratio of center/outer, stoichiometric air ratio at the onset of combustion. The lowest NOx emission, 182ppm(6% O2 base), was achieved at about AR:0.6 of the first combustion stage with low NOx burner. Also, unburned carbon content of char collected in this combustion condition was about 1wt%.

• 한국연소학회지
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• 제21권3호
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• pp.7-15
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• 2016

The fuel in conventional liquid fuel combustor is atomized by spray method for high efficiency and low emissions. To improve the overall fuel efficiency and lower pollutant emissions in liquid fuel combustion systems, the effective spatial and temporal separation of droplet evaporation from normal spray process is needed. In this paper, the recuperation of high temperature burnt gas for fuel evaporation was proposed to develop a cylindrical premixed combustor. The recuperation process using U shaped tube is effective to evaporate the liquid fuel. The results show that the flame mode is changed into red radiation flame, blue flame and lift off flame with decreasing equivalence ratio as gas fuel combustion mode. In particular, the blue flame is found to be very stable at heating load 9.2 kW and equivalence ratio 0.731. NOx was measured blow 105 ppm ($O_2$ zero base) from equivalence ratio 0.705 to 0.835. CO which is a very important emission index in liquid fuel combustor was observed below 5 ppm ($O_2$ zero base) under the same equivalence region.

• 한국대기환경학회지
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• 제18권5호
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• pp.401-410
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• 2002

Concerns for energy conservation, environmental pollution, and the fact that organic wastes account for a major portion of our waste materials, have created the interest of biogas, which usually contains about 60 to 70 percent methane, 30 to 40 percent carbon dioxide, and other gases, including ammonia, hydrogen sulfide, mercaptans and other noxious gases. Cyclone combustors are used for homing a wide range of fuels such as low calorific value gas, waste water, sludge. coal, etc. The 3-dimensional swirling flow, combustion and emission in a tangential inlet cyclone incinerator under different inlet conditions are simulated using a standard k-s turbulence model and ESCRS (Extended Simple Chemically-Reacting System) model. The commercial code Phoenics Ver.3.4 was used for the present work. The main parameters considered in this work are inlet velocity and air to fuel ratio. The results showed that the change of operating conditions had an influence on the shape and size of recirculation zones, mixture fraction and axial velocity which are important factors for combustion efficiency and emission behavior. The application of this kind of computer program seams to be promising as a potential tool for the optimum design of a cyclone combustor with low emission.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.254-257
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• 2017

본 논문에서는 항공 가스 터빈용 연소기 개발을 위한 단일 연소기 섹터 시험 결과에 대한 논의하였다. 연소기로 공급되는 전체 공기 중 주 연소 영역으로 공급되는 공기비율을 변화 시키면서 배출물 농도, 라이너 표면 온도 분포 및 연소기 출구 온도 패턴 등의 연소 성능 변화를 연구하였다. 주 연소 공기량이 증가함에 따라 CO와 NOx 배출 농도가 증가하는 경향이 있었으며, 연소기 출구 패턴은 개선되는 것으로 나타났다. 희석 공기공을 회전시켜 배치하는 경우 연소기 출구 온도 패턴의 변화가 민감하게 변하는 것을 확인하였다. 이러한 연구 결과는 연소기의 효율, 내구성 및 배출물 감소 성능을 고려한 연소기 라이너 설계 최적화 과정의 기초 자료로 활용할 예정이다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 1998년도 제10회 학술강연회논문집
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• pp.2-2
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• 1998

현대우주항공(주)가 미국의 AlliedSignal사와 함께 국제 공동 개발중인 10MW급의 ASE120 엔진은 항공용 엔진을 산업용으로 개조한 개조형 엔진으로서 희박 예혼합 예기화(Lean Premix prevaporization) 방식의 연소기를 쓰고 있다. 이 연소기는 연소에 관여하는 공기량을 부하에 따라 가감하여 일정 공연비를 유지하는 air staging법을 사용하고 있으며 이로써 연소화염온도를 일정치로 조절하여 연소중 생성되는 유해가스의 양을 목표치 이하로 제어한다. 연소화염온도 설계치는 2912$^{\circ}$F이며 배기가스 발생량은 NOx, CO모두 궁극적으로 10ppmv 이하를 목표로 하고 있다. 이러한 건식 저 배기가스(Dry Low Emission) 연소기가 그 역할을 다하기 위하여는 양호한 혼합기를 확보하는 것이 선결 문제이다. 본 연구소에서는 두 개의 혼합기(mixing can)가 180$^{\circ}$ 간격으로 환형 연소기(annular type)에 접선 방향으로 설치되어 대칭을 이루고 있고 혼합기의 혼합성능을 측정하기 위하여 제작된 시험장치에는 하나의 혼합기만을 쓰고 있다.

• 한국추진공학회지
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• 제2권2호
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• pp.99-107
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• 1998

ASE120 엔진 연소기에 쓰이는 벤츄리(venturi)형 예혼합기의 혼합성능을 시험 평가하였다. 이 시험에서는 가스연료 대신 찬공기를 주입하고 혼합공기의 온도를 측정함으로 혼합정도를 계산하였다. DOE 기법을 사용하여 시험변수 matrix를 구성하고 시험결과를 분석하여 최적의 변수조합을 가지는 형상을 도출하였다. 선정된 형상에 대하여 확인시험이 수행되었다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
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• pp.307-313
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• 2002

In the paper, the prototype development of a 75kW class microturbine for the distributed generation market is partly presented which has continued with the government funding. In the introduction, an overview of the development of microturbines in the world is presented. A series of development procedures are shown with design, manufacture and self-sustaining tests. During the first year, aerodynamic and structural design/analysis, mechanical design are performed for the compressor, the turbine and the combustor. A premixed lean burn combustor technology is used fur the low emission requirements. Foil air bearings and high-speed motors are employed for higher reliability. The self-sustaining conditions have been successfully achieved with the prototype manufactured engine as a preceding operation.

• 한국대기환경학회지
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• 제19권5호
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• pp.541-549
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• 2003

A basic experimental study was conducted in order to find the optimum combustion control technology to decrease the thermal NO$_{x}$, by applying the catalytic combustion method with natural gas. NO$_{x}$ emission increased with increasing space velocity due to temperature rising in the furnace. In order to overcome the low resistance to high temperature, secondary air was supplied to the CST combustor. The following secondary fuel formed combustible mixture in part, which resulted in steep increase of the exiting temperature of the 2nd catalyst bed. It led to the more generator of NO$_{x}$, 30∼60% of the 1 st catalyst bed. It might be due to the potential increase of thermal NO$_{x}$.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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• pp.122-127
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• 2006

The objective of this research is to determine generally applicable design principles for the development of Rapid mix burner. Details operating RMB(Rapid mix burner) is designed that thermal NOx and prompt NOx formation be reduced through control of low peak flame temperature, and nearly uniform flame temperature by rapid mixing at the ignition point. Results from RMB(Rapid mix burner) achieving lower than 43 ppm NOx emissions and nearly flame temperature uniform