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HWAHAK KONGHAK,
Vol.39, No.2, 251-256, 2001
Vol.39, No.2, 251-256, 2001
Zine Titanate 탈황제의 탈황·재생 반응 속도 해석
An Analysis of Desulfurization and Regeneration Reaction Rates of Zinc Titanate Sorbent
석탄가스중의 황화수소를 제거하기 위한 zinc titanate 탈황제의 탈황반응 및 재생 반응 특성을 열 중량 분석기를 이용하여 측정 및 고찰하였다. 탈황 반응에는 새 탈황제를, 재생 반응에는 53% 황화된 탈황제를 사용하였다. 황화 반응은 600-750 ℃, 재생 반응은 650-750 ℃의 온도 범위에서 수행되었다. 재생 반응의 산소 농도 범위는 3-21 부피 %이었다. 탈황 및 재생 반응의 활성화 에너지는 각각 13.36 kcal/gmol, 37.94 kcal/gmol이었다. 재생 반응의 산소 농도에 대한 반응 차수는 0.662이었다. 탈황 반응 속도는 탈황제의 전환율이 증가함에 따라 감소하여 전환율 0.789에서 활성이 소멸되었다. 재생 반응은 전환율이 증가함에 따라 증가하여 전환율 약 0.5에서 최대 값을 보인 후 감소하였다. 탈황 및 재생 반응에 대한 상관식을 제시하였다.
Characteristics of desulfurization and regeneration reactions of a zinc titanate sorbent used to absorb hydrogen sulfide in coal gas have been investigated by using a thermo-gravimetric analyzer. Desulfurization was carried out with fresh sorbent and regeneration with sorbent sulfurized as much as 53%. Temperature ranged from 600℃ to 750℃ and from 650℃ to 750℃ for desulfurization and regeneration, respectively. Oxygen concentration ranged from 3 vol% to 21 vol% for regeneration. Activation energies of desulfurization and regeneration were found as 13.36 kcal/gmol and 37.94 kcal/gmol, respectively. The order of regeneration reaction with respect to oxygen concentration was found as 0.662. The rate of desulfurization decreased as the conversion of sorbent increased. The desulfurization ability of sorbent was depleted at a conversion about 0.789. The rate of regeneration decreased after an initial increase as conversion increased. The maximum regeneration rate occurred at a conversion about 0.5. Rate equations of desulfurization and regeneration were suggested.
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