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홍성원(Seong Weon Hong),이필형(Pil Hyong Lee),차천륜(Chun Loon Cha),송기종(Ki Jong Song),임현진(Hyun Jin Im),황상순(Sang Soon Hwang) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.44
The flameless combustion has been considered as one of the promising combustion technology for high energy efficiency and reducing NOx and CO emissions. To investigate the effects of fluid conditions on the formation of flameless combustion, a numerical approach was performed. The flameless combustion possesses lower temperature region and more uniform temperature distribution than conventional flame. The results show that the flow rate of the system which mainly influence on recirculation ratio is the most important parameter for flameless combustion.
홍성원(Seong Weon Hong),이필형(Pil Hyong Lee),황상순(Sang Soon Hwang) 한국연소학회 2013 한국연소학회지 Vol.18 No.2
The flameless combustion has been considered as one of the promising combustion technology for high thermal efficiency, reducing NOx and CO emissions. In this paper, the effect of air and fuel injection condition on formation of flameless combustion was analyzed using three dimensional numerical simulation. The results show that the high temperature region and the average temperature was decreased due to increase of recirculation ratio when air velocity is increased. The average temperature was also affected by entrainment length. Generally mixing effect was enhanced at low entrainment length and dilution was dominated at high entrainment length. This entrainment length was greatly affected by air and fuel injection velocity and distance between air and fuel. It is also found that the recirculation ratio and dilution effect were generally increased by entrainment length and the recirculation ratio, mixing and dilution effect are the significant factor for design of flameless combustion system.
1㎾급 개질기용 예혼합 Swirl 버너의 화염안정성 분석
차천륜(Chun Loon Cha),홍성원(Seong Weon Hong),조순혜(Soon Hye Jo),이필형(Pil Hyong Lee),박봉일(Bong Il Park),황상순(Sang Soon Hwang),양시원(Si Won Yang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Fuel processing systems which convert fuel into rich gas need high temperature environment(600-1000℃). Generally, anode-off gas or mixture of anode-off gas and natural gas is used as input gas of fuel reformer. The purpose of this study is to develop a premixed swirl burner that can be used for 0.5-1.5㎾ fuel cell reformer. Premixed swirl burner experiments using natural gas and mixture of natural gas & anode off gas were carried out respectively to investigate the flame characteristics by heating capacity and equivalence ratio. The results show that the flame length is getting shorter with increasing the hydrogen content and flame stability region is confirmed in the experiment at equivalence ratio. Carbon monoxide emission is under 50ppm between 0.65 and 0.85 of equivalence ratio and NOx emission is below 50ppm in the all range.
Perforated SiC 관 내부에서 초단열화염의 형성 및 개질에 대한 연구
이필형(Pil Hyong Lee),차천륜(Chun Loon Cha),홍성원(Seong Weon Hong),황상순(Sang Soon Hwang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Meso scale combustion process in the perforated silicon carbide (SiC) tube was numerically simulated for reforming methane to the syngas with GRI Mechanism 1.2. To verify the existence of super adiabatic flame, the combustion process under the equivalence ratio of mixture of 1.0 and inlet flow velocity of 60㎝/s was examined. Its result shows that the flame with temperature spike can be stabilized in a meso scale SiC tube reactor. And under operating conditions of rich equivalence ratio of 2.0 relevant to reforming process of methane, it was observed that the shape of flame temperature peak shows similar to that at equivalence ratio of 1.0. The position of flame temperature peak was moved to outlet region gradually with increasing the inlet velocity.
형상 및 작동조건의 변화가 순산소무화염 형성에 미치는 영향
차천륜(Chun Loon Cha),이필형(Pil Hyong Lee),홍성원(Seong Weon Hong),황상순(Sang Soon Hwang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Flameless combustion using the oxygen as an oxidizer is considered as one of the promising combustion technology for high energy efficiency and reducing nitrogen oxides and carbon dioxide emissions. To investigate the effects of geometry and operating conditions on the formation of oxygen flameless combustion, a numerical approach was performed. The recirculation ratio(Kv) as main parameter for flameless combustion was defined as the ratio of recirculated mass of product gas to the mass of fuel and oxidizer entering the furnace. Results show that the flameless combustion possesses the low temperature region and more uniform temperature distribution. Lower than 20ppm CO emissions under the equivalence ratio of 0.4 was produced under conditions of the oxygen nozzle diameter of 3㎜ and the distance between fuel and oxygen nozzles of 10㎜ or 20㎜.