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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.37, No.3, 430-438, 1999
Dry Sorbent Injection에 의한 배가스 처리:Calcium계와 금속산화물 흡착제를 이용한 HF 제거
Emission Control of Flue Gas by Dry Sorbent Injection : HF Removal by Calcium-Based and Metal Oxide Sorbents
이충무, 오세천, 이해평, 김희택, 류경옥
DSI공정을 이용하여 배가스 내의 HF를 제거하기 위하여 여러 가지 실험변수들에 따른 HF와 calcium계 흡착제의 반응성을 고찰하였다. 250-950℃의 반응온도구간에서 고정층 반응기로부터 배출되는 기체를 GC로 분석하였으며, 반응기구를 확인하기 위하여 BET, XRD, SEM/EDX, DLS, TG/DTA등의 기기 분석을 수행하였다. Calcium계 흡착제는 750℃에서 가장 높은 반응성을 나타냈다. 그 이상의 온도에서는 흡착제의 구조적 변화로 인하여 비표면적이 감소하므로 반응성이 저하되었다. 유입되는 HF의 초기 농도가 높을수록 반응성은 우수하였으며, HF의 유량은 150ml/min일 경우에 반응성이 가장 우수하였다. Calcium계 흡착제 이외에 Al2O3, Cu2O, Fe2O3, MgO, TiO2, ZnO와 같은 금속산화물 흡착제와 HF의 반응성을 살펴본 결과, 본 연구의 실험 조건하에서는 Fe2O3가 가장 반응성이 좋은 것으로 확인되었다.
In order to reduce HF in a flue gas via DSI process, the HF removal efficiency of calcium-based sorbent was investigated. By using gas chromatography the effluent gas exited from fixed-bed reactor was analyzed at temperature range of 250-950 ℃. Also BET, XRD, SEM/EDX, DLS and TG/DTA were carried out to certify the reaction mechanism. HF removal efficiency was maximum at 750 ℃ and decreased above this temperature because of specific surface area reduction resulted from structural changes of sorbent. Reactivity of sorbent was proportional to initial concentration of HF and flow rate of 150 ml/min showed the highest removal capacity. In addition, HF removal efficiency of various metal oxide sorbents such as A12O3, Cu2O, Fe2O3, MgO, TiO2 and ZnO was studied. As a result, Fe2O3 showed an excellent removal capacity in this study.
Keywords: DSI; HF; Calcium-Based Sorbent; Metal Oxide
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