황화수소를 제거함으로써 황화된 흡착제를 산소를 사용하여 산화적 재생반응을 행하는 도중 또 다른 환경오염원인 SO₂가 많이 발생하였다. 따라서 이를 제거하기 위하여 SO₂ 제거능력이 우수하다고 알려진 CaO 흡착제를 화화된 흡착제와 물리적으로 혼합하여 산화적 재생반응을 수행하면서 CaO의 입자크기, 혼합형태, 혼합비, 그리고 소성온도 등이 SO₂ 제거에 미치는 영향을 살펴 보았다. 초기 흡착제와 CaO 흡착제의 크기가 서로 비슷할 경우 CaO간의 응집이 입자 내 물질전달저항으로 작용하여 완전재생에 걸리는 시간이 길어지고 제거되지 않고 배출되는 SO₂의 양도 많았다. 또 SEM 사진으로부터 이 CaO의 응집을 확인할 수 있었다. CaO 입경이 작을수록 SO₂와의 반응성은 좋아 SO₂ 배출량이 적었다. 충전은 단순하게 혼합한 불균일 충전의 경우보다 이중층 형태로 충전하는 것이 효과적이었으며 황화된 흡착제와 CaO 흡착제와의 최적 혼합비는 약 1:3 정도였다. 그리고 CaO의 소성 온도가 높을수록 SO₂와의 반응성이 좋음을 알 수 있었다.

Our previous study showed that SO₂, one of prilous pollutant, was emitted during the oxidative regeneration of sorbents sulfided by H₂S. In order to prevent SO₂ emissions, the oxidative regeneration was carried out by mixing the sulfided sorbents with CaO which has been reported as excellent sorbent for SO₂ and the effects of particle size, packing type, mixing ratio and calcination temperature of CaO on the reactivity of CaO with SO₂ were investigated. CaO which has similar particle size with that of fresh sorbent has poor reactivity because agglomeration of CaO increased intraparticle transport resistance and SEM photographs confirmed this phenomenon. For smaller CaO particle, the SO₂ emitted was little. Double bed packing type was better than random mixing type for the removal of SO₂ and on SO₂ was emitted when the mixing ratio of ZnS to CaO was above 1:3. Higher calcination temperature of CaO was more favorable for SO₂ removal.

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