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미세한 입자의 석회석 slurry를 이용한 아황산 가스의 흡수
Absorption of Sulfur Dioxide into Slurry Containing Fine Limestone Particles
HWAHAK KONGHAK, June 1981, 19(3), 149-158(10), NONE
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Abstract
미세한 석회석입자를 이용한 아황산가스의 흡수현상을 2 반응면 모델(3영역 모델)을 적용하여 이론적으로 해석하였다. 제안된 모델을 확인하기 위하여, 평평한 기액 계면을 갖는 교반조 흡수기를 사용하여 20 ℃에서 행산 흡수 실험으로부터 구해진 액막 물질전달계수에 대한 증진인자(enhancement factor) 또는 모델로부터 이론적으로 산출된 값과 비교되었는데, 비교적 좋은 일치를 보였다. 석회석의 용해를 증진시킴으로써 아황산가스 흡수 속도가 증가되었다. 액막의 두께가 석회석 입자보다 훨씬 클 경우, CaSO3·1/2(H2O)의 생성이 석회석입자 표면에 축적되는 현상을 고려해야 함이 제시되었다.
Chemical absorption mechanism of sulfur dioxide into the slurry containing fine limestone particles was analyzed theoretically by a two reaction planes model(three zone model). As an experimental verification of the model, enhnncement factors for the liquid film mass transfer coefficients, which were obtained by the absorption using a stirred tank absorber with a plane gas-liquid interface at 20 ℃, were compared with the values predicated theoretically. It was shown that the absorption rates can be satisfactorily predicted by the proposed model. The data of absorption rate indicate that it is necessary to enhance the solid dissolution in order to improve the absorption rase. Blinding in the liquid film as well as in the bulk slurry must be considered significantly when the limestone particle is much smaller than the thickness of liquid film.