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Received October 31, 2005
Accepted July 3, 2006
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파일럿 규모의 흐름반응기에서 유기 및 무기 첨가제가 질소산화물의 선택적 무촉매 환원반응에 미치는 영향
Effects of Organic and Inorganic Additives on Selective Non Catalytic Reduction Reaction of NOx in a Pilot Scale Flow Reactor
광운대학교 환경공학과, 139-701 서울시 노원구 월계동 447-1 1한국과학기술연구원 나노환경연구센터, 136-791 서울시 성북구 하월곡동 39-1 2서울시립대학교 환경공학부, 130-473 서울시 동대문구 전농동 90
Eco-Nano Research Center, Korea Institute of Science and Technology, 39-1, Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea 1Dept. of Environmental Engineering, Kwangwoon University, 447-1, Wolgye-dong, Nowon-gu, Seoul 139-701, Korea 2Faculty of Environmental Engineering, University of Seoul, 90, Jeonnong-dong, Dongdaemun-gu, Seoul 130-743, Korea
Korean Chemical Engineering Research, October 2006, 44(5), 540-546(7), NONE Epub 14 November 2006
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Abstract
파일럿 크기의 흐름반응기에서 유기와 무기 첨가제가 질소산화물의 선택적 무촉매 환원반응에 미치는 영향을 공정변수 변화에 따라 고찰하였다. 질소산화물 저감효율은 반응기의 체류시간과 초기 NOx 농도 증가에 따라 증가하였다. 요소용액에 의한 NOx 환원반응은 850 ℃에서 시작되어 970 ℃에서는 최대값을 나타내었으며, NSR = 2.0까지 증가하였다. 유기첨가제로서 에탄올과 페놀의 첨가는 온도창을 저온 영역으로 이동시켰으며, 에탄올 구조내의 탄화수소에 의한 부반응으로 최대의 NOx 저감효율이 감소하였다. NaOH 첨가는 NaOH의 연쇄반응과 N2O 저감으로 인하여 온도창을 확대시키고, 최대 NOx 저감효율을 10％ 정도 향상시켰다.
Effects of organic and inorganic additives on the SNCR reaction of NOx were investigated in a pilot scale flow reactor with a variation of operating parameters. NOx reduction efficiency increased with the increase of a residence time and an initial NOx concentration. NOx reduction reaction by urea solution started to appear about 850 and then reached to maximum value around 970 ℃. NOx reduction efficiency also increased with the increase of NSR (Normalized Stoichiometric Ratio) up to 2.0. Addition of ethanol and phenol as an organic additives shifted the optimum temperature window to lower region with decreasing the maximum NOx reduction efficiency. This might be due to the side reaction of hydrocarbon in ethanol structure. NaOH addition widened the temperature window and enhanced the NOx reduction efficiency about 10％ due to the chain reaction of NaOH and the reduction of N2O.
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