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이대인(Dae In Lee),조현서(Hyeon Seo Cho),조천래(Chon Rae Cho),이정훈(Jeong Hoon Lee),강조해(Jo Hae Kang),최민호(Min Ho Choi),김도희(Do Hee Kim),윤진숙(Jin Suk Yoon) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
Temporal and spatial characteristics of pollutant loads from the various pollution sources in Kwangyang Bay were evaluated. Total discharging loadings of BOD, TN, and TP by unit loading estimation were 11,524㎏/day, 11,536㎏/day, and 827㎏/day, respectively, and were mainly affected by the industrial and population sources. The Yeosu and Kwangyang cities as administrative district had the highest pollutant loads. Flow rate ranges from about 30-4,406,400㎡/day in December to 240-35,337,600㎡/day in August with a flow rate of PS27(the Seomjin River} as the highest one. Total COD, TN, and TP loadings in August were about 89,915㎏/day, 2,077,845㎏/day, and 50,123㎏/day, respectively, which exceeded those of December. Especially, of input sources, the Seomjin river had the most pollutant loads. Wastewater discharging loads from the water treatment facilities was the greatest contributors to pollutant loads in the inner part of Kwangyang Bay. Point sources located in south-western part of the bay showed high concentration in heavey metals distribution. Seasonal variations of pollutant loads were related to the changes of flow rate, those were increased rapidly on August, 2004. For the improvement of water quality in this area, pollutant loads were reduced within the limits of the environmental capacity.
이대인(Dae In LEE),조현서(Hyeon Seo CHO),조천래(Chon Rae CHO),이정훈(Jeong Hoon LEE),강조해(Jo Hae KANG),최민호(Min Ho CHOI),김도희(Do Hee KIM),윤진숙(Jin Suk YOON) 전남대학교 수산과학연구소 2004 수산과학연구소논문집 Vol.13 No.-
Temporal and spatial characteristics of pollutant loads from the various pollution sources in Kwangyang Bay were evaluated. Total discharging loadings of BOD, TN, and TP by unit loading estimation were 11,524 ㎏/day, 11,536 ㎏/day, and 827 ㎏/day, respectively, and were mainly affected by the industrial and population sources. The Yeosu and Kwangyang cities as administrative district had the highest pollutant loads. Flow rate ranges from about 30-4,406,400 ㎥/day in December to 240-35,337,600 ㎥/day in August with a flow rate of PS27 (the Seomjin River) as the highest one. Total COD, TN, and TP loadings in August were about 89,915 ㎏/day, 2,077,845 ㎏/day, and 50,123 ㎏/day, respectively, which exceeded those of December. Especially, of input sources, the Seomjin river had the most pollutant loads. Wastewater discharging loads from the water treatment facilities was the greatest contributors to pollutant loads in the inner part of Kwangyang Bay. Point sources located in south-western part of the bay showed high concentration in heavy metals distribution. Seasonal variations of pollutant loads were related to the changes of flow rate, those were increased rapidly on August, 2004. For the improvement of water quality in this area, pollutant loads were reduced within the limits of the environmental capacity.
파울링 예측을 위한 가스-입자 이상 유동 해석(1)-고온 풍동 설계 및 성능실험-
하만영,이대래,Ha, Man-Yeong,Lee, Dae-Rae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.11
We designed the hot wind tunnel to reproduce the conditions of utility boiler and carried out its performance test, in order to investigate the particulate two-phase flow behaviour, the fouling and heat transfer characteristics to the heat exchanger. The hot wind tunnel introduces the control system to control the temperature in the test section. The particle is injected into the hot gas stream. The fouling probe (cylindrical tube) is positioned normal to the particulate gas-particle two-phase flow and cooled by the air. The temperature of gas and cooling air, and temperature in the fouling probe are measured as a function of time, giving the local and averaged heat transfer and fouling factor. The shape of particulate deposition adhered to the fouling probe is also observed.
염공부하에 따른 세라믹 화이버 버너의 배기 배출물과 분광학적 특성에 관한 연구
정용기(Yong Ki Jeong),이대래(Dae Rae Lee),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),Alexander Yun,위재혁(Jae Hyug Wie),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An experimental study was performed to investigate the effects of both non-perforated and perforated ceramic fiber mat on temperature, CO, NO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring emission and radiation characteristics. Combustion was achieved at the excess air ratio of 0.9~2, heat capacity of 1000~3000㎉/h. The local temperature distribution inside the mat and near the glass surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration decreased as the excess air ratio increases. The NO concentration is maximal at the excess air ratio of approximately 1. The both fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively.
위재혁(Jae Hyug Wie),이대래(Dae Rae Lee),김영수(Young Soo Kim),전충환(Chung Hwan Jeon) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Energy efficient and low pollution combustion systems the use gaseous fuels have been in great demand in recent year. Radiant burner in many different forms are emerging as very desirable combustion systems for same reason. Porous radiant burners are used in drying, preheating and curing, and in other type of materials processing and manufacturing processes. However, little knowledge is available about the operating characteristics and the structure of flames in porous ceramic fiber radiant burners. The objective of the present work is to investigate the global performance characteristics of the ceramic fiber burner. A detailed study which includes the spectral intensity, gas temperature, radiation efficiency and global pollutant emissions. Another objective is to study the flame structure of the ceramic fiber burner by measuring the local gas temperature. The results indicate that ceramic fiber burner do offer a 19-44% gain in radiant efficiency. The ceramic fiber burner exhibit significant spectral intensity peaks in the band at 2.0-2.5㎛. The local temperature distribution inside the mat and near the mat surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. Nox emission from ceramic fiber burner is less than 25ppm throughout the operating range.
정용기(Yong-Ki Jeong),김영수(Young-Soo Kim),이대래(Dae-Rae Lee),양대봉(Dae-Bong Yang),류정완(Jung-Wan Ryu),Alexander Yun,장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was performed to investigate the effects of mixing Quality, inlet pressure, nozzle diameter on CO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring temperature, CO emission and radiation characteristics. Combustion was achieved at the firing rate of 88~99 ㎉/hr, inlet pressure of 100~250㎜H₂O. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration increased as the firing rate increases. The reason for rise of CO concentration is that it becomes the relatively rich condition. The fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively. There is a small difference in the variable mixing tube. However spectral intensity increased with the firing rate.
저현서(Cho Hyeon-Seo),강조해(Kang Jo-Hae),조천래(Cho Chon-Rae),박정채(Park Jeong Chae),이대인(Lee Dae-In) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
시화호내ㆍ외해수와 유입되는 하천수 중 PFCs의 농도분포를 2005년 11월에 채취한 시료를 이용하여 분석하였다. 시화호의 표층수, 저층수 및 유입하천수 중의 농도는 perfluorohexanesulfonate (PFHS)가 ND~0.8, 0.3~0.5, 1.8~35.9 ng/L, perfluorooctanesulfonate (PFOS)는3 3.6~11.6, 3.6~8.1, 5.8~253.2 ng/L, perfluorooctanesulfonamide (PFOSA)는 ND~0.5, ND~0.4, 0.3~2.7 ng/L, perfluorononanoic acid (PFNA)는 ND~3.5, ND~0.6, ND-125.0 ng/L, pefluorooctanoic acid (PFOA)는 ND~3.3, ND~0.7, 0.7~405.5 ng/L의 범위로 각각 검출되었다. 전반적으로 PFOS와 PFOA가 전체 PFCs에서 상대적으로 높았으며, 지역별로는 시화호로 유입되는 하천수 중 산업단지부근에 위치한 L1~L5 지점에서 다른 조사지점의 농도에 비해 상대적으로 매우 높은 농도를 보였다. Water samples collected from the surface and bottom layer of Sihwa lake, and the inflow stream water around Sihwa lake were analyzed to determine the concentration of PFCs on November, 2005. Ranges of concentrations of perfluorohexanesulfonate (PFHS) in seawater of the surface and bottom layer of Sihwa lake and the inflow stream water around Sihwa lake were ND-0.8, 0.3~0.5 and 1.8~35.9 ng/L, respectively. Those of perfluorooctanesulfonate (PFOS) were 3.6~11.6, 3.6~8.1, 5.8~253.2 ng/L, perfluorooctanesulfonamide (PFOSA) were ND~0.5, ND~0.4, 0.3~2.7 ng/L, perfluorononanoic acid (PFNA) were ND~3.5, ND~0.6, ND~125.0 ng/L, perfluorooctanoic acid (PFOA) were ND~3.3, ND~0.7, 0.7~405.5 ng/L, respectively. Dominant compounds of PFCs were PFOS and PFOA. Concentrations in site(L1~L4) of inflow stream located on the industrial complex were higher than the values of seawater and the others stream.