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다이오드 레이저를 이용한 사각로 내 O<SUB>2</SUB> 및 온도 측정에 관한 연구
윤성운(Sungwoon Youn),신명철(Myoungchul Shin),김세원(Sewon Kim),이창엽(Chanyeop Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Controlling oxygen concentration in heating furnace is the most important factor in the steel making progress. Tunable diode laser absorption spectroscopy sensor is applied to measure the oxygen concentration and temperature in lab-scale electric furnace. A DFB type diode laser of 760nm line centre frequency is used to measure oxygen concentration and temperature is measured using a pair of oxygen transitions near 760nm Scanned-wavelength direct absorption spectroscopy method is applied and experimental data are obtained. As part of the sensor development effort, fundamental spectroscopic parameters including the line strength, absorption, line centre frequency are measured to improve the current databases.
다이오드 레이저를 이용한 배기가스 O<SUB>2</SUB> 농도 및 온도 동시 측정에 관한 실험적 연구
김세원(Sewon Kim),신명철(Myoungchul Shin),이창엽(Changyeop Lee),윤성운(Sungwoon Youn),김영일(Young-Il Kim) 한국연소학회 2012 한국연소학회지 Vol.17 No.1
Simultaneous measurements of oxygen concentration and temperature using diode laser in the combustion environment are successfully accomplished. A single DFB type diode laser of 760 nm line centre frequency is used and the scanned-wavelength direct absorption spectroscopy method and wavelength modulation spectroscopy method are applied to measure absorption signals below 793 K temperature region. The experimental results show that oxygen concentration are measured within 1% accuracy and temperature are measured within 5% accuracy. This new method of simultaneous measurements of concentration and temperature with a single diode laser shows a great promise.
관군연소보일러 연소기의 저 NO<SUB>X</SUB> 연소특성에 관한 연구
권승진(Seungjin Kwon),신명철(Myoungchul Shin),김세원(Sewon Kim),이창엽(Changyeop Lee) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The objective of this research is to determine generally applicable design principles for the development of low NOx burner which is used for high efficiency industrial boiler. In case of the high efficiency industrial boiler, combustion chamber is smaller than that of general boiler. So furnace volume heat release rate is relatively high. In order to reduce volume of industrial boiler, non-furnace combustion type boiler concept is introduced kind of water tube boiler. In this type of boiler, burner flame directly impinged at water tube. The advantages of this type boiler are a compact size of boiler system and high efficiency. However, because of flame impingement at water tube, CO emission is very high. The experimental study has been mainly motivated to obtain generally applicable design for the front premixed burner and optimization parameters for NOX and CO. It is the design concept of the front premixed burner that fuel and air are mixed near the ignition point. And strong internal recirculation zone, which is caused by high swirling flow, is developed on the centerline of the flame. By the flame quenching at water tube, the flame temperature is suppressed and thermal NOX is minimized. In case of CO concentration, it decreased by the optimization of the distance between burner exit and water-tube and CO oxidation zone in combustion champer
흡수 분광법을 이용한 배기가스 중 CO 농도 계측에 대한 실험적 연구
김세원(Sewon Kim),신명철(Myoungchul Shin),윤성운(Sungwoon Youn),이창엽(Changyeop Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
A tunable diode laser sensing system based on CO absorption spectroscopy near 1.568 ㎛ was developed to measure CO concentration in exhaust gas. The sensor was designed, tested, and demonstrated in the multi-pass cell. Gas concentration measuring test in a multi-pass cell were used to verify the sensor accuracy at 296K. Absorbing intensity and 2f signal height were monitored over the path length range of 450㎝ to 3530㎝ using DAS and WMS. WMS techniques were used to improve the detection limit in the short path length. Absorption spectra were based on the HITRAN2008 database.
WMS 기법을 이용한 사각 덕트 내 배기가스 O₂ 및 온도 측정에 관한 실험적 연구
윤성운(Sungwoon Youn),김세원(Sewon Kim),신명철(Myoungchul Shin),이창엽(Changyeop Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Simultaneous measurements of oxygen concentration and temperature using diode laser in the combustion environment are successfully accomplished. A single DFB type diode laser of 760㎚ line centre frequency is used and the wavelength modulation spectroscopy method is applied to measure absorption signals below 793K temperature region which is not measured using scanned - wavelength direct absorption spectroscopy method. The experimental results showed that oxygen concentration are measured 1% accuracy and temperature are measured within 5% accuracy. This new method of simultaneous measurements of concentration and temperature with a single diode laser shows a great promise.
Hydrolysis of Waste Cooking Oil in Sub-critical Water Condition
( Sufi Ullah Siddik Bhuyan ),( Taeha Kim ),( Ruri Lee ),( Myoungchul Shin ),( Kwanghyeon Song ),( Yongchan Seo ),( Younghwan Chu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol (MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃, 0.4<p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO<sub>2</sub> medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.