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HWAHAK KONGHAK,
Vol.37, No.2, 250-261, 1999
Vol.37, No.2, 250-261, 1999
Dry Sorbent Injection에 의한 배가스 처리: Calcium계와 금속산화물 흡착제를 이용한 SO2 제거
Emission Control of Flue Gas by Dry Sorbent Injection: SO2 Removal by Calcium-Based and Metal Oxide Sorbents
광양제철소에 설치되어 있는 DSI공정에 대한 SO2제거의 최적 조건을 얻기 위하여 여러 가지 실험 변수들에 따른 Ca계 흡착제의 반응성을 고찰하였다. 현재 사용되고 있는 Ca계 흡착제의 가장 큰 단점인 낮은 이용도를 보완할 목적으로 CuO, Fe2O3, TiO2, ZnO등과 같은 금속산화물 흡착제의 탈황능을 고찰하였다. 반응온도에 따른 흡착제의 탈황능을 살펴본 결과, 현재 흡착제가 투입되고 있는 250 ℃ 영역에서는 5 %미만의 낮은 탈황능을 보인 반면에 SO2가 발생된 후 열교환기와 안정기로부터 배출되는 800-900 ℃영역에서는 최고 60%정도의 전화율을 보였다. 따라서 흡착제의 투입지점을 고온영역인 안정기의 출구 쪽으로 이동시킴으로써 더 높은 SO2 제거효율을 얻게 될 것으로 기대된다. 다른 금속산화물에 대한 탈황능을 고찰해 본 결과, 400 ℃이하의 저온영역에서는 CuO가 다른 금속산화물에 비해 우수한 탈황능을 보였지만 450 ℃이상에서는 Ca계 흡착제의 반응성이 더 좋음을 알 수 있었다.
In order to obtain the optimal conditions for dry sorbent injection process of Kwangyang steel Co., SO2, removal efficiency of calcium-based sorbent was examined at various experimental conditions. Development of metal oxide sorbents such as CuO, Fe2O3, TiO2 and ZnO was carried out to compensate for low utilization of calcium-based sorbent. Removal efficiency of sorbent was below 5 % at 250 ℃, the temperature of present injection point, and was maximum 60% at 800-900 ℃, the temperature of downstream of heat exchanger and stabilizer. Therefore, present injection point must be changed to higher temperature region. Comparison of removal efficiency of calcium-based sorbent and various metal oxide sorbents revealed that CuO was superior to the other sorbents below 400 ℃ and calcium-based sorbent was favorable at high temperature above 450 ℃.
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