7.6 μm 파장 영역의 다중 광 흡수 신호 파장 변조 분광법을 이용한 이산화황 농도 측정

송아란; 정낙원; 배성우; 황정호; 이창엽; 김대해; Aran Song; Nakwon Jeong; Sungwoo Bae; Jungho Hwang; Changyeop Lee; Daehae Kim

Clean Technology, Vol.26, No.4, 293-303, December, 2020

DOI10.7464/ksct.2020.26.4.293 Export Citation

7.6 μm 파장 영역의 다중 광 흡수 신호 파장 변조 분광법을 이용한 이산화황 농도 측정

Measurement of Sulfur Dioxide Concentration Using Wavelength Modulation Spectroscopy With Optical Multi-Absorption Signals at 7.6 μm Wavelength Region

송아란^{1, 2}, 정낙원^{1, 2}, 배성우^{1, 3}, 황정호², 이창엽^{1, †}, 김대해^{1, †}

¹한국생산기술연구원 청정에너지시스템연구부문, 31056 충청남도 천안시 서북구 입장면 양대기로길 89
²연세대학교 기계공학과, 03722 서울특별시 서대문구 연세로 50
³전북대학교 기계설계공학과, 54896 전라북도 전주시 덕진구 백제대로 567

Aran Song^{1, 2}, Nakwon Jeong^{1, 2}, Sungwoo Bae^{1, 3}, Jungho Hwang², Changyeop Lee^{1, †}, and Daehae Kim^{1, †}

¹Clean Energy System Research Department, Korea Institute of Industrial Technology, 89, Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si, Chungcheongnam-do 31056, Republic of Korea
²Mechanical Engineering Department, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
³Mechanical Design Engineering Department, Chonbuk University, 567, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea

E-mail:,

초록

세계보건기구에 따르면 대기오염은 건강에 대한 주요 위험원으로 대기오염으로 인해 매년 약 700만 명의 조기 사망이 발생하고 있다. 이산화황(SO2)은 대표적인 대기오염물질로 황 성분이 포함된 연료의 연소에서 다량 발생한다. SO2 발생량을 감소시키기 위해서는 대형 연소 환경에서 이를 실시간으로 정밀하게 측정하고 측정 값을 바탕으로 저감 설비를 최적화하는 과정이 필요하다. 이 논문에서는 미세먼지 전구물질인 SO2의 농도를 측정하기 위해 파장 가변형 다이오드 레이저 흡수 분광법 중 파장 변조 분광법을 이용하였다. 광원으로는 7.6 μm 양자 폭포 레이저를 사용하였고 7623.7 ~ 7626.0 nm 사이의 64개 다중 광흡수선으로 SO2 농도 측정이 가능함을 증명하였다. 실험은 1 atm, 296 K에서 28, 76 m multi-pass cell을 사용하여 수행되었다. SO2 농도는 고농도(1000 ~ 5000 ppm)와 저농도(10 ppm 이하)로 두 종류로 실험 하였다. 추가적으로 가스 셀 외에 레이저가 지나가는 경로에 질소를 채워 대기 중의 H2O가 SO2 측정에 미치는 영향을 확인하였다. SO2는 3 ppm까지 측정하였고 측정 된 SO2 농도는 전기 화학식 센서와 NDIR 센서 측정 결과와 비교되었다.

According to the World Health Organization (WHO), air pollution is a typical health hazard, resulting in about 7 million premature deaths each year. Sulfur dioxide (SO2) is one of the major air pollutants, and the combustion process with sulfur-containing fuels generates it. Measuring SO2 generation in large combustion environments in real time and optimizing reduction facilities based on measured values are necessary to reduce the compound’s presence. This paper describes the concentration measurement for SO2, a particulate matter precursor, using a wavelength modulation spectroscopy (WMS) of tunable diode laser absorption spectroscopy (TDLAS). This study employed a quantum cascade laser operating at 7.6 μm as a light source. It demonstrated concentration measurement possibility using 64 multi-absorption lines between 7623.7 and 7626.0 nm. The experiments were conducted in a multi-pass cell with a total path length of 28 and 76 m at 1 atm, 296 K. The SO2 concentration was tested in two types: high concentration (1000 to 5000 ppm) and low concentration (10 ppm or less). Additionally, the effect of H2O interference in the atmosphere on the measurement of SO2 was confirmed by N2 purging the laser’s path. The detection limit for SO2 was 3 ppm, and results were compared with the electronic chemical sensor and nondispersive infrared (NDIR) sensor.

Keywords:TDLAS;WMS;Sulfur dioxide (SO2);Multi-absorption lines;Mid-IR

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[1] Geiser P, Sensors, 15(9), 22724 (2015)

[2] Kim TO, Ishida T, Adachi M, Okuyama K, Seinfeld JH, Aerosol Sci. Technol., 29(2), 111 (1998)

[3] Khaniabadi YO, Polosa R, Chuturkova RZ, Daryanoosh M, Goudarzi G, Borgini A, Tittarelli A, Basiri H, Armin H, Nourmoradi H, Babaei AA, Naserian P, Process Saf. Environ. Protect., 111, 346 (2017)

[4] Sappey AD, Masterson P, Huelson E, Howell J, Estes M, Hofvander H, Jobson A, Combust. Sci. Technol., 183(11), 1282 (2011)

[5] Nelson CM, Knight KS, Bonanno AS, Serio MA, Solomon PR, Halter MA, Opt. Sensing Environ. Monitoring, 15 (1993).

[6] Teichert H, Fernholz T, Ebert V, Appl. Opt., 42(12), 2043 (2003)

[7] Hieta T, Merimaa M, Appl. Phys. B-Lasers Opt., 117(3), 847 (2014)

[8] Genner A, Martin-Mateos P, Moser H, Waclawek JP, Lendl B, SPIE, 10926, 95 (2019)

[9] Li YQ, Demerjian KL, J. Geophys. Res. D Atmos., 109(16), 1 (2004)

[10] Henningsen J, Hald J, Appl. Phys. B-Lasers Opt., 76(4), 441 (2003)

[11] Rawlins WT, Hensley JM, Sonnenfroh DM, Oakes DB, Allen MG, 2005 Conf. Lasers Electro-Optics, CLEO, 44(31), 6635-6643 (2005).

[12] Berkoff TA, Wormhoudt JC, Miake-Lye RC, Environ. Monitoring Remediation Technol., 3534, 686-693 (1999).

[13] Gao Q, Zhang Y, Yu J, Wu S, Zhang Z, Zheng F, Lou X, Guo W, Sens. Actuators A-Phys., 199, 106 (2013)

[14] Lou X, Somesfalean G, Chen B, Zhang Z, Appl. Opt., 48(5), 990 (2009)

[15] Supplee JM, Whittaker EA, Lenth W, Appl. Opt., 33(27), 6294 (1994)

[16] Reid J, Labrie D, Appl. Phys. B Photophysics Laser Chem., 26(3), 203 (1981)

[17] Philippe LC, Hanson RK, Appl. Opt., 32(30), 6090 (1993)

[18] Liu JTC, Jeffries JB, Hanson RK, Appl. Phys. B Lasers Opt., 78(3-4), 503 (2004)

[19] Zhou X, “Diode-laser Absorption Sensors for Combustion Control,” 186 (2005).

[20] Gordon LE, Rothman LS, Hill C, Kochanov RV, et al., J. Quant. Spectrosc. Radiat. Transf., 203, 3 (2017)

[21] Rieker GB, Jeffries JB, Hanson RK, Appl. Opt., 48(29), 5546 (2009)

[22] McRae GJ, J. Air Pollut. Contr. Assoc., 30(4), 394 (1980)

[23] Molloy KC, Oxford, Woodhead Publishing, 218 (2010).

[24] Flaud JM, Lafferty WJ, Sams RL, J. Quant. Spectrosc. Radiat. Transf., 110(9-10), 669 (2009)

[25] van der Lans RP, Glarborg P, Dam-Johansen K, Prog. Energy Combust. Sci., 23(4), 349 (1997)

[26] Gu H, Liu L, Li Y, Chen R, Wen L, Wang J, SPIE, 7160 (2008)