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양원,류창국,최상민,Yang, Won,Ryu, Chang-Kook,Choi, Sang-Min 한국연소학회 2002 한국연소학회지 Vol.7 No.3
Processes in an iron ore sintering bed can characterized as a relatively uniform progress of fuel, cokes combustion and complicated physical change of solid particles. The sintering bed was modelled as an unsteady one-dimensional progress of the fuel layer, containing two phases: solid and gas. Coke added to the raw mix, of which the amount is about 3.5% of the total weight, was assumed to form a single particle with other components. Numerical simulations of the condition in the iron ore sintering bed were performed for various parameters: moisture contents, cokes contents and air suction rates, along with the various particle diameters of the solid for sensitivity analysis. Calculation results showed that the influence of these parameters on the bed condition should be carefully evaluated, in order to achieve self-sustaining combustion without high temperature section. The model should be extended to consider the bed structural change and multiple solid phase, which could treat the inerts and fuel particles separately.
양원,류창국,최상민,최응수,이덕원,허완욱,Yang, Won,Ryu, Chang-Kook,Choi, Sang-Min,Choi, Eung-Soo,Ri, Deok-Won,Huh, Wan-Wook 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.7
Thermo-fluid characteristics in coke oven, sintering machine and blast furnace in iron-making facility are key processes related to the quality and productivity of the pig iron. Solid material in the processes usually forms a bed in a gas flow. For simulation of the processes by mathematical model, the solid beds are idealized to be a continuum and a reacting solid flow in the gas flow. Governing equations in the form of partial differential equations for the solid material can be constructed based on this assumption. Iron ore sintering bed is simulated and limited amount of parametric study have been performed. The results have a good agreement with the experimental results or physical phenomena, which shows the validity and applicability of the model.
다중 고체상을 고려한 소결기의 코크스 연소-열전달 모델링
양원(Won yang),류창국(Chang kook Ryu),최상민(Sangmin choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this study we propose an undteady 1-dimensional model of an ieon ore sinterring bed with multiple solid phases, which confers a phase on each solid material. This model contains combustion, limestone decomposition, gaseous reaction, heat transfers between each phase, and geomentric chanes of the solid particles. Simulation results are compared with the limited experimental data set of various coke conrents and air supply rates. Effect of the coke diameter is also evaluated. They predict the experikental results well and show applicabilities to the varioussystem of the fuel bed with various solid materials.
액체금속을 이용한 고온 연료가스내의 황화수소 제거 평가
이명일(Ming-ri Li),류창국(Chang-kook Ryu) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The synthetic gases, produced from coal gasification contain H2S and COS which are acidic and therefore to be removed from the gases before they enter electrical or chemical conversion processes. The conventional desulfurization requires cooling down of the hot gas which causes loss of energy or corrosion in heat exchangers. In order to avoid this, a novel idea was investigated to use liquid metal as absorbent of sulfur compounds at high temperatures. Tin(Sn) was chosen to be the best candidate with extremely low volatility and low toxicity as well as low costs. The theoretical limits of H2S removal were calculated by chemical equilibrium for different concentrations and temperatures. Experiments were also carried out in a bubble column reactor with different compositions of H2 and H2S at various temperatures. The sulfur removal efficiency was 93% in the test reactor, which could be further increased in actual reactors.
채태영(Tae-Young Chae),나익환(Ik-hwan Na),류창국(Chang-kook Ryu),양원(Won Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
This study is aimed to compare results of computational fluid dynamics and experimental results by non-catalytic partial oxidation of methane. The experiment result, pure oxygen burner was used and experiment was performed by measuring syngas concentration for various stoichiometric ratios. Based on experiments pilot scale reformer were employed and its parameter was resulted by using fluent 6.3. The simulation results similar that experimental results, and we confirmed the simulation of tthe internal reformer. In this study will be helped design modification of reformer.
SRF 연소로 2차 공기 주입 부분의 형상변화에 따른 연소 특성 연구
양승재 ( Seung-jae Yang ),노희지 ( Hee-ji Roh ),채종성 ( Jong-seong Chae ),엄태인 ( Tae-in Ohm ),류창국 ( Chang-kook Ryu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 추계학술발표논문집 Vol.2019 No.-
국내 각종 폐기물 발생량은 인구의 증가, 경제의 발전 등 도시화가 급속히 진행됨에 따라 정부의 저감 노력에도 불구하고 폐기물의 배출량이 꾸준히 증가하고 종류도 점점 다양해지고 있다. 따라서 SRF를 보다 더 친환경적이고 안정적으로 처리하면서 폐열을 효과적으로 회수하여 에너지 이용효율이 가장 높은 전력생산이 가능한 전용 연소로 최적 설계 기술이 절실하다. 본 연구에서는 SRF 전용 연소보일러를 설계 제작하기 위해서 2차 공기를 주입하는 목 형상이 각각 다른 연소로에 동일 조건의 연료성상, 공기량 비율 등에 대하여 연소로 내부유동장 및 온도장을 계산하였다. 특히 연소실내 고온영역 발생을 억제할 수 있도록 하여 NOx 발생을 최소화하기 위한 해석을 전산유체역학(CFD)을 이용하여 계산하였다. 1, 2차공기 주입은 각각 50%로 고정하고 연소실내에서 연소가스 온도와 속도의 변화를 계산한 후 연소실 높이에 따른 CO<sub>2</sub>, CO, SRF, O<sub>2</sub> 등 화학종 반응의 배출특성을 비교 분석하여 SRF 전용 연소보일러를 설계, 제작하는데 기초자료로 활용하고자 한다.