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이필형(Pil Hyong Lee),조순혜(Soon Hye Jo),박봉일(Bong Il Park),황상순(Sang Soon Hwang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
In this paper, meso scale combustion process in the silicon carbide(SiC) tube using a two dimensional approaches with GRI Mechanism 1.2 was investigated. The numerical simulation model is based on SIMPLE algorithm using segregated solver of Fluent. The computational mesh structure which is divided into 60×15 and boundary conditions are set to constant mass flow rate at the inlet and constant pressure condition at the outlet respectively. To verify the existence of super adiabatic flame, the combustion process under the lean equivalence ratio of mixture of 0.65 and inlet flow velocity of 60㎝/s was simulated. Its result shows that the flame with temperature spike can be stabilized in a SiC burner. The flame temperature peak was located about 27㎜ away from the inlet region. The temperature on this peak was roughly 435K higher than the adiabatic flame temperature of 1753K for a free laminar flame at these conditions. And the position of flame temperature peak was moved to outlet region gradually with increasing the inlet velocity.
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.
이필형(Pil Hyong Lee),박봉일(Bong Il Park),조순혜(Soon Hye Jo),황상순(Sang Soon Hwang) 한국연소학회 2010 한국연소학회지 Vol.15 No.3
Fuel processing systems which convert fuel into rich gas (such as stream reforming, partial oxidation, autothermal reforming) need high temperature environment (600~1,000℃). Generally, anode-off gas or mixture of anode-off gas and LNG is used as input gas of fuel reformer. In order to make efficient and low emission burner system for fuel reformer, it is necessary to elucidate the combustion and emission characteristic of fuel reformer burner. The purpose of this study is to develop a porous premixed flat ceramic burner that can be used for 1~5 ㎾ fuel cell reformer. Ceramic burner experiments using natural gas, hydrogen gas, anode off gas, mixture of natural gas & anode off gas were carried out respectively to investigate the flame characteristics by heating capacity and equivalence ratio. Results show that the stable flat flames can be established for natural gas, hydrogen gas, anode off gas and mixture of natural gas & anode off gas as reformer fuel in the porous ceramic burner. For all of fuels, their burning velocities become smaller as the equivalence ratio goes to the lean mixture ratio, and a lift-off occurs at lean limit. Flame length in hydrogen and anode off gas became longer with increasing the heat capacity. In particular, the blue surface flame is found to be very stable at a very lean equivalence ratio at heat capacity and different fuels. The exhausted NOx and CO measurement shows that the blue surface flame represents the lowest NOx and CO emissions since it remains very stable at a lean equivalence ratio.