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산화제 결핍 분위기에서의 층류 확산화염내 OH, PAHs 및 그을음 분포
심성훈,신현동,Shim, Sung-Hoon,Shin, Hyun-Dong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10
We investigate the flame behavior and spatial distribution of OH, PAHs and soot in a confined buoyant diffusion flame with decrease of the coflowing air flow rate. Direct photographs and Schlieren images represent that flame is Ally occupied by blue flame and becomes unstable, which is partially detached to the fuel nozzle tip in a near extinction flame under extremely reduced oxidizer condition. Laser induced fluorescence profiles clearly shows that OH is still generated in near-extinction flame, although intensity becomes weak with decreasing air flow rate. But soot scattering image cannot be seen any more in an oxidizer deficient ambience and simultaneously the PAHs are widely distributed downstream. These results are due to that a decrease of oxygen concentration in the combustion chamber leads to a temperature drop of flame, as a consequence, to a delay in soot growth and to a expanding of the PAHs, as soot precursors.
SiC 필라멘트를 이용한 소염 직전의 확산화염 온도 계측
심성훈,신현동,Shim, Sung-Hoon,Shin, Hyun-Dong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
The thin SiC filament technique has been employed to identify the possibility of measuring flame temperature, and especially unstable near-extinction flame temperature in an oxidizer deficient ambience, by comparing the relative visible (non-IR) luminosities of SiC filaments with thermocouple measured temperature in co-flowing, laminar propane/air diffusion flames. The results show good agreement between the digitized relative visible luminosity profiles of the SiC filaments and temperature profiles measured using a thermocouple at temperatures above $700^{\circ}C$, although, a non-linear calibration is probably required far the whole temperature range. The highest radial peak temperature exists near to the nozzle exit. and the centerline temperatures were virtually unchanged with increasing flame height in an oxidizer deficient near-extinction flame.
심성훈(Sung Hoon Shim),정상현(Sang Hyun Jeong),민효기(Hyo Ki Min),이상섭(Sang Sup Lee) 大韓環境工學會 2014 대한환경공학회지 Vol.36 No.2
하수슬러지의 해양투기 규제에 따른 처리대안으로 석탄화력발전소 보조연료로서의 활용이 제안되고 있다. 슬러지를석탄과 혼합하여 사용한다면 연료의 조성변화로 인하여 산성가스의 배출특성이 달라질 것으로 예상된다. 본 연구에서는 국내하수처리장 7곳에서 발생한 하수슬러지를 수거하여 석탄과 혼합한 뒤 실험실 규모의 연소로에서 연소시킨 후 배출되는 질소산화물(NOx), 이산화황(SO₂), 염화수소(HCl), 염소(Cl₂) 가스를 분석하였다. NOx는 슬러지 혼합에 따른 배출농도 변화가 가장작았고, SO₂는 슬러지를 혼합하여 연소하였을 때 석탄 연소가스와 비교하여 높은 배출농도 증가를 보였다. HCl + Cl₂는 슬러지의 염소함량에 따라 서로 다른 배출농도를 보였다. Using dried sludge as a secondary fuel of a coal-fired power plant is proposed as an alternative option for sludge disposal. Because elemental contents of sludge are different from those of coal, different levels of acidic gas emissions are expected from the co-combustion of sludge with coal. In this study, sludge samples were obtained from 7 sewage treatment plants in Korea. Each sludge sample was combusted together with coal in a lab-scale combustor, and the concentrations of nitrogen oxides (NOx), sulfur dioxide (SO₂), hydrogen chloride (HCl), chlorine (Cl₂) in the flue gas were analyzed. Compared to the combustion of coal only, NOx concentration was slightly higher in the flue gas from the co-combustion of coal and sludge. SO₂ emission increased with the combustion of sludge due to the higher content of sulfur in sludge than in coal. For most of the tested samples, the concentrations of HCl and Cl₂ were varied depending on the chlorine content in the sludge sample.
심성훈(Sung Hoon Shim),정상현(Sang Hyun Jeong) 한국연소학회 2010 한국연소학회지 Vol.15 No.3
Combined technique of burner and DOC has been used for regeneration of Diesel Particulate Filter. Experiments has been performed to increase the temperature of engine exhaust gas to burn the collected soot in DPF at all conditions of operation of 3 liter diesel engine. Ignition temperature of soot can be successfully obtained by heats of burner flame and residual fuel oxidation at diesel oxidation catalyst even in the condition of oxygen deficiency. It is found that the load of air compressor and heat loss can be reduced to the level of practical application. It is also found that CO and THC emissions are not increase by additional combustion of regeneration burner.
심성훈(Shim, Sung-Hoon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
MILD combustion has been successfully applied to gaseous fuels and few commercial systems are now in operation. Extending MILD combustion applicability to solid fuel of sawdust is the focus of the present work. The MILD combustion furnace at the University of Adelaide in Australia was used in this study. A measurement of O₂ and CO emissions have been carried out in parallel with consideration of NOx emission and compared in each modes of conventional natural gas combustion, natural gas MILD combustion, NOx emission in natural gas MILD combustion mode can be reduced to 20% in comparison with conventional combustion. Emission in cases of air carrying sawdust combustion and CO₂ carrying sawdust combustion were also compared. Air and CO₂ were sued as a carry gas for the sawdust. It was found that MILD conditions are possible for sawdust particles of less than 355{mu}m without additional air pre-heating. It was also found that when using CO₂ as the carry gas the flame inside the furnace was not visible anymore and that NOx emission dropped to less than two folds.
MILD Combustion Technology for Recycled Fuel
심성훈(Shim, Sung Hoon),정상현(Jeong, Sang Hyun),이상섭(Lee, Sang Sup) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Optimum operation conditions of low-NOx MILD combustion for gaseous and solid fuels have been investigated by experimental and computer simulation. Loop reactor type MILD combustor without air pre-heater has been used in the present work. The results show that the balance of injection velocities of fuel and surrounding air is major factor for maintaining MILD combustion mode. Temperature difference between lower and upper part can be reduced less than 20 degree of Celsius. It was found that NOx emission in MILD combustion also can be remarkably reduced to more than 85% in comparison with conventional premixed combustion, and reduced to more than 50% in case of nitrogen and carbon dioxide carrying dried waste water sludge and pulverized coal in comparison with the same of air carrying. It was also found that carbon monoxide emission increase was not appeared at the time of changeover to MILD combustion mode from premixed or air carrying combustion at optimum operation condition.