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Received January 7, 2004
Accepted September 13, 2004
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H2O2 Leaching 공정을 이용한 저 유황탄의 연소 전 탈황
Desulfurization Characteristics of Low Sulfur Coals before Combustion using H2O2 Leaching Process
숭실대학교 환경·화학공학과, 156-743 서울시 동작구 상도5동 1-1
Deprartment of Chemical and Environmental Engineering, Soongsil University, 1-1, Sangdo-5-dong, Dongjak-gu, Seoul 156-743, Korea
Korean Chemical Engineering Research, December 2004, 42(6), 754-761(8), NONE Epub 11 January 2005
Abstract
본 연구에서는 저 유황탄(수입 유연탄 2종과 국산 무연탄 2종)을 대상으로 연소 전 탈황 공정인 H2O2 leaching 공정을 적용하여 탈황 특성을 파악하고 최적의 탈황 조건을 연구하였다. H2O2 leaching시 적정 탈황조건은 반응시간 60분, 반응온도 90 ℃, H2O2 농도 20% 이상 이였으며 탈황률은 무연탄(55-80%)이 유연탄 (58-67%)보다 다소 높았다. 입경이 탈황률에 미치는 영향은 실험 오차 이내로 미미하였으며 유연탄의 발열량은 다소 감소하는 경향을, 무연탄은 약간 증가하는 경향을 보였다. 회분 제거율은 유연탄 11-22%, 무연탄 9-26%였다. Leaching 후의 유연탄과 장성탄은 연소시 배연탈황장치를 가동하지 않아도 현재의 SO2 배출 허용 기준을 충족시킬 것으로 기대된다.
This research aimed to elucidate desulfurization characteristics of low sulfur coals (two imported bituminous coals and two domestic anthracite coals) before combustion and to optimize desulfurization conditions in a leaching process using hydrogen peroxide. The optimum condition for the leaching process was obtained when the experiments were carried out for 60 minutes at 90 ℃ using 20% H2O2. The sulfur removal efficiency for the anthracite and bituminous coals were 55-80% and 58-67%, respectively. The effect of particle size on desulfurization efficiencies was negligible within experimental error. Heating values of treated bituminous coals slightly decreased, while those for anthracite coals slightly increased. The ash removal efficiency for bituminous and anthracite coals were 11-22% and 9-26%, respectively. It is thought that some of chars processed by leaching process would meet the current SO2 emission standard without flue gas desulfurization process.
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Sydorovych YYE, Gaivanovych VI, Martynets EV, Fuel, 75(1), 78 (1996)
Ersahan H, Boncukcuoglu R, Kocakerim MM, Fuel, 74(11), 1682 (1995)
Palmer SR, Hippo EJ, Dorai XA, Fuel, 74(2), 193 (1995)
Friedman S, Warzinski RP, J. Engineering for power, 361 (1977)
Cho EH, Luo QL, Fuel Process. Technol., 46(1), 25 (1996)
Lin L, Khang SJ, Keener TC, Fuel Process. Technol., 53(1), 15 (1997)
Ryu HW, Chang YK, Kim SD, HWAHAK KONGHAK, 31(3), 325 (1993)
Ali A, Sunil K, Srivastava RH, Fuel, 71, 835 (1992)
Borah D, Baruha MK, Haque I, Fuel, 80, 1475 (2001)
Karaca H, Ceylan K, Fuel Process. Technol., 50(1), 19 (1997)
Finar IL, "Organic Chemistry," Vol. I., Longman Group Ltd. (1980)
Gilbert EE, "Sulfonation and Related Reaction," Interscience (1965)
THOMS T, Fuel Process. Technol., 43(2), 123 (1995)
Karr C, Jr., "Analytical Methods for Coal and Coal Products," Academic Press (1978)
Ratanakandilok S, Ngamprasertsith S, Prasassarakich P, Fuel, 80, 1937 (2001)
Culfaz M, Ahmed M, Gurkan S, Fuel Process. Technol., 47(2), 99 (1996)
Hamamci C, Kahraman F, Duz MZ, Fuel Process. Technol., 50(2), 171 (1997)
Sonmez O, Giray ES, Fuel Process. Technol., 70, 159 (2001)
Park KS, "A Study on Desulfurization Characteristics of Low Sulfur Coal before Combustion," Ph. D. Thesis, Soongsil University, Korea (2003)
Laat JD, Le GT, Legube B, Chemosphere, 55, 715 (2004)
Truong GL, Laat JD, Legube B, Water Res., 38, 2383 (2004)
