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Zr 계 벌크비정질합금의 마이크로 단조를 이용한 미세 성형성 평가와 유한요소해석 적용에 관한 연구
강성규(S. G. Kang),나영상(Y. S. Na),박규열(K. Y. Park),손선천(S. C. Son),이종훈(J. H. Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Micro-forming is a suited technology to manufacture very small metallic parts(several mm~㎛). Micro-forming of Zr?₂Cu₁?Ni₁₃Al? bulk metallic glass(BMG) as a candidate material for this developing process are feasible at a relatively low stress in the supercooled liquid state without any crystallization during hot deformation. In this study, micro-formability of a representative bulk metallic glass, Zr?₂Cu₁?Ni₁₃Al?, was investigated for micro-forging of U-shape pattern. Micro-formability was estimated by comparing R<SUB>f</SUB> values (=A<SUB>f</SUB>/A<SUB>g</SUB>), where Ag is cross-sectional area of U groove, and A<SUB>f</SUB> the filled area by material. Microforging process was simulated and analyzed by applying finite element method. FEM simulation results should reasonable agreement with the experimental results when the material properties and simulation conditions such as top die speed, remeshing criteria and boundary conditions tightly controlled. The micro-formability of Zr?₂Cu₁?Ni₁₃Al? was increased with increasing load and time in the temperature range of the supercooled liquid state. Also, FEM Simulation using DEFORM was confirmed to be applicable for the micro-forming process simulation.
Reducing technology of fuel-NOx generation using fuel-rich/-lean catalytic combustion
S.K. Kang(강성규),S.J. Lee(이승재),I.S. Ryu(유인수),H.D. Shin(신현동),H.S. Han(한헌식) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A two-step fuel-rich/fuel-lean catalytic combustion seems to be one of the most effective methods to control simultaneously the NO generation and the hydrocarbon (HC) conversion from fuel-bound nitrogen. By controlling equivalent air ratio for maintaining fuel-rich and fuel-lean condition over each catalytic layer, space velocity, inlet temperature, and catalyst component, the HCand ammonia conversion efficiency higher than 95% could be achieved, with ammonia conversion to NO remaining below 5%. The experimental results wouldbe applied to the combustion of land fill gas and to gasified refuse-derived fuels as a method of minimizing NO generation.
강성규(S.K. Kang),이승재(S.J. Lee),유인수(I.S. Ryu),이규철(K. C. Lee) 한국연소학회 2007 한국연소학회지 Vol.12 No.4
Utilization of sewage sludge for industrial fuel should be considered in appropriate calory with low emission of environmental pollutants and the amount of sewage sludge for continuously long-time operation. For the low grade fuel(<4,000kcal/㎏), one of proper processes is that coal and oil are added into sewage sludge to remove impurities and increase calory(>7,000kcal/㎏) and the amount of fuel having sewage sludge. Recently, 2-step agglomeration has been attempted by secondarily agglomerate sewage sludge onto the primary nuclei formed by agglomeration of coal and oil. Furthermore, sawdust and waste oil can substitute about 1/3 each for coal and mineral oil consumed in this process, which will lead to securing alternative energy resources from environmental pollutants as well as cost reduction.
유상필(S.P. Yu),정남조(N.J. Jeoung),이승재(S.J. Lee),류인수(I.S. Ryu),강성규(S.K. Kang),송광섭(K.S. Song) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-
Compared to conventional flame combustion. catalytic combustion had the advantage of oxidation of V.O.C. gas which was high voluminous, low caloric mixture flow. However, the temperature of mixture gas should be over the one of catalytic reaction start and the control of reaction on the catalytic surface tends to be vulnerable. To overcome these obstacles, composition of both catalytic combustor and heat exchanger was devised and named the sequential catalytic combustion system. In this system, only trigger unit needed preheating process for transient starting time. Once trigger unit was ignited, the next unit was supplied heat to ignite from that and same process was performed to the last one sequentially. When it come to steady state, whole mixture gas was oxidated at each unit simultaneously and preheating for trigger unit was not needed any more. System of 100 kcalh/hr capacity was devised and operated successfully.