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고온건식탈황 유동층 반응기에서 아연계 탈황제의 재생반응에 미치는 산소농도의 영향
Effects of O2 Concentration on Regeneration Reaction of a Zinc Titanate in a Hot Gas Desulfurization Fluidized Reactor
한국에너지기술연구원 에너지환경연구부, 대전 305-343 1충북대학교 화학공학부, 청주 361-763
Korea Institute of Energy Research, Daejeon 305-343, Korea 1Department of Chemical Engineering, Chungbuk National University, Chongju 361-763, Korea
HWAHAK KONGHAK, December 2001, 39(6), 739-743(5), NONE
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Abstract
Zinc titanate 탈황제를 사용하여 내경 4.5 cm인 소형유동층 반응기에서 재생반응특성을 연구하였다. 산소농도를 5%에서 21%까지 변화시키면서 재생실험을 수행하였다. 산소의 농도변화에 따라 배출되는 SO2의 최대농도는 양론적으로 이론치와 일치하였다. 발열반응으로 인한 재생반응기의 온도상승은 산소농도가 증가함에 따라 증가하였다. 2차 황화반응 초기에 SO2가 발생되지 않는 것으로 보아 sulfate가 형성되지 않았다는 것을 확인할 수 있었다. 재생반응 후 시료의 물리-화학적 특성 분석결과 zinc titanate 탈황제는 부반응 및 물성변화가 없는 것으로 판단할 수 있었다. 이와 같은 실험으로 분무 건조법으로 성형된 zinc titanate 탈황제는 유동층 반응기에서 산소농도 21%의 공기로 재생 가능성을 보여 주었다.
The regeneration characteristics of spray-dried zinc titanate sorbent in a fluidized bed reactor were examined at temperatures of 650℃ and 700℃ with the regenerated gas of the oxygen concentrations from 5% to 21%. The outlet SO2 peak concentrations were coincided with the theoretical values depending on inlet O2 concentration. As the oxygen concentration was increased, the temperature rise in the regeneration reactor was increased due to the heat of exothermic reaction. During the initial stage of the second sulfidation reaction, SO2 was not detected in the outlet gases. It was an indirect indication that zinc sulfate had not been formed during the first regeneration reaction. The various analysis results showed little differences in physical and chemical properties between fresh and regenerated sorbent.
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Rhee YW, Lee TJ, Yi CK, Chem. Ind. Technol., 15(3), 237 (1997)
Lee TJ, Park NK, Kim JH, Kim KS, Park YW, Yi CK, HWAHAK KONGHAK, 34(4), 435 (1996)
Kang SH, Rhee YW, Kang Y, Han KH, Lee CK, Jin GT, HWAHAK KONGHAK, 35(5), 642 (1997)
Yi CK, Park J, Cho SH, Jin GT, Son JE, HWAHAK KONGHAK, 37(1), 81 (1999)
Berggren MH, Jha MC, "Enhanced Durability and Reactivity for Zinc Ferrite Desulfurization Sorbent," DOE/MC/23172-2764(DE90000422) (1989)
Cicero DC, "METC Hot Gas Desulfurization Program Overview," Proceedings of the Coal-Fired Power Systems 94, DOE/METC-94/1008(DE94012252) 219 (1994)
Gangwal SK, Gupta RP, McMichael WJ, Heat Recov. Syst. CHP, 15, 205 (1996)
Gupta RP, Gangwal SK, "High-Temperature. High-Pressure Testing of Zinc Tatanate in a Bench-Scale Fluidized-Bed Reactor for 100Cycles," Topical Report to DOE/METC (1993)
Gupta RP, Gangwal SK, Khare GP, "Fluidized-Bed Testing of Z-sorb III Sorbent," Topical Report to DOE/METC (1994)
Jothimurugesan K, Gangwal SK, Ind. Eng. Chem. Res., 37(5), 1929 (1998)
Choi JH, Yi CK, Son JE, Kim SD, HWAHAK KONGHAK, 38(5), 698 (2000)
Yi CK, Cho SH, Son JE, Moon YS, Choi JH, HWAHAK KONGHAK, 39(2), 251 (2001)
Ayala RE, "Enhanced Durability of High-Temperature Desulfurization Sorbents for Moving-Bed Applications Option 2 Program: Development and Testing of Zinc Titanate Sorbents," DOE/MC/25003-3495(DE94000028) (1993)
Ayala RE, Chuck T, Gal E, Guota RP, "Development of Sorbents for High-Temperature Desulfurization in Moving-Bed Systems," Proceedings of the Coal-Fired Power Systems 94, DOE/METC-94/1008(DE94012252), 637 (1994)
Lew S, Jothimurugesan K, Flytzani-Stephanopoulos M, Ind. Eng. Chem. Res., 28, 535 (1989)
Gupta RP, Gangwal SK, "Enhanced Durability of Desulfurization Sorbents for Fluidized-Bed Applications," DOE/MC/25006-3271(DE93000247) (1992)
Gupta RP, Gangwal SK, Johnson EW, "Integration and Testing of Hot Desulfurization and Entrained-Flow Gasification for Power Generatio Systems Vol II. Evaluation of Zinc Loss from Zinc Titanate Sorbents During Hot Gas Desulfurization," DOE/MC/23277-3548(DE94000074) (1993)
