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TDLAS를 이용한 고온로 내 산소 농도 측정에 관한 연구
소성현(Sunghyun So),유미연(Miyeon Yoo),맹새롬(Saerom Maeng),이창엽(ChangYeop Lee) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.2
The use of a tunable diode laser absorption sensor(TDLAS) for concentration measurement of oxygen in a high temperature furnace is presented. The concentration of oxygen was chosen as the target species to increase the energy efficiency and to reduce the pollutants. The sensor utilizes diode laser of having the visible absorption band of oxygen near 13142.5 cm<SUP>-1</SUP>. And both scanned-wavelength direct absorption spectroscopy and wavelength modulation spectroscopy with second-harmonic detection (WMS-2f ) techniques were used to measure oxygen concentration precisely. The results in this paper show that the advantages of wavelength modulation spectroscopy method over direct absorption spectroscopy appear in diagnosing the high temperature environment in which the measuring distance is short.
근적외선 파장 영역에서 레이저 흡수 분광법을 이용한 화염 내 OH 라디칼 농도 측정에 관한 실험적 연구
소성현(Sunghyun So),유미연(Miyeon Yoo),박지연(Jiyeon Park),김대해(Daehae Kim),박대근(Dae Geun Park),황정호(Jungho Hwang),이창엽(Changyeop Lee) 한국연소학회 2020 한국연소학회지 Vol.25 No.1
As primary carrier of chain branching and propagation reactions, OH (Hydroxyl) radical is one of the most important species in hydrocarbon combustion environment. However, it is no easy to measure the OH radicals concentration in the flame, because it has short duration time, big fluctuation and rapid reaction characteristics. Nevertheless, it is important to measure OH radicals precisely because OH radicals in fames are closely related to combustion efficiency and pollutant emission. To overcome the OH radical concentration measurement in the rapid chemical reaction, TDLAS (Tunable Diode Laser Absorption Spectroscopy) can be a very attractive analysis technique for measuring the concentration of certain species in a gaseous mixture in the flame. In this study, an optical absorption region of OH radical was selected in the near infrared laser (6419 ㎝<SUP>-1</SUP>) to measure OH radical quantitatively in flame. Unfortunately, Most of the light absorption signals of OH radical are interfered by the absorption signals of H₂O. So, the OH radical concentration should be calculated after excluding the contribution of H₂O absorption from united absorption signal of OH and H₂O.
근적외선 영역의 흡수 분광법을 이용한 불균일 온도 분포 조건에서의 정밀 산소 농도 측정에 관한 연구
소성현(Sunghyun So),유미연(Miyeon Yoo),맹새롬(Saerom Maeng),김대해(Daehae Kim),박호영(Hoyoung Park),이창엽(Changyeop Lee) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.1
This study describes a measurement of oxygen concentration at Non-uniform high temperature region. Accurate measuring of internal temperatures and oxygen concentrations in high-temperature gases is important for improving energy efficiency of a combustion system and reduction of pollutant. However, it is not easy to measure the temperature inside combustion boiler by T/C(Thermocouple). because of its internal temperature and solid particles. And to overcome the reliability problem of measured temperature in huge combustion system such as power plant boiler, it is necessary to measure the line average temperature like as TDLAS method. TDLAS is a very attractive analysis technique for measuring the temperature and concentration of certain species in a gaseous mixture inside the combustion system. When a gas concentration is measured by TDLAS, Line-strength which is one of the important physical parameter becomes a indispensable value. Because the line-strength varies according to temperature change, accurate temperature values are needed to measure a gas concentration precisely. In this study, The temperature was measured via the strong H₂O absorption signals with a four near infrared diode lasers. And the oxygen concentration was measured using a visible diode laser in addition to applying exact line averaged temperature measured by H₂O absorption signals.