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고온석탄가스에서 아연계 탈황제에 의한 H2S의 제거

Re- moval of H2S by Zinc-Based Sorbents from High Temperature Coal-Derived Gases

HWAHAK KONGHAK, August 1996, 34(4), 435-442(8), NONE
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Abstract

복합금속산화물인 zinc ferrite와 zinc titanate 탈황제를 사용하여 석탄가스에서 H2S의 제거 가능성을 연구하였다. 고온가스에 함유한 H2S와 탈황제의 반응에 있어서 최적반응온도를 찾기 위해서 500-750℃ 범위에서 조사하였으며, 실험결과 zinc ferrite와 zinc titanate의 H2S제거 효율은 각각 550℃와 650℃에서 최적조건을 나타내었다. 또한 SEM과 BET분석을 통해서도 최적온도에 대한 입자의 특징을 확인할 수 있었다. 황하-재생의 연속반응 10-cycle 실험은 탈황제의 연속적인 사용가능성을 평가하기 위해서 충전층 반응기에서 수행하였으며 표본시료에 대한 BET표면적, XRD, SEM 등의 분석도 같이 수행하였다. 황화-재생반응의 cycle이 반복되는 동안 zinc ferrite는 탈황제의 화학적 변형으로 인해서 황수용 능력이 증가하는 특이한 결과가 나타났으며, zinc titanate는 연속적인 cycle에서 거의 일정한 황수용 능력을 보였다.
Removal of H2S by mixed-metal oxides was studied experimentally to demonstrate the potential use of zinc ferrite and zinc titanate as a sorbent in high temperature desulfuri- zation of coal gas. To find optimal temperature, the reactions of sorbents with a hot gas con- taining H2S were investigated over a temperature range of 500-750℃. The experimental results showed that optimal H2S removal efficiency of zinc ferrite and zinc titanate sorbents was obtained at 550℃ and 650℃ respectively, and SEM and BET analyses were in accord with this feature. Ten cycles of sulfidation and regeneration were sequentially conducted in the packed-bed reactor to determine the long-term performance of the sorbents. A series of characterizations were also performed sample including BET surface area, XRD, and SEM. Zinc ferrite sorbent exhibited a significant rise in sulfur capacity during the repeated cycles of absorption and regeneration due to the chemical transformations of the sorbent, while zinc ti- tanate sorbent showed nearly constant sulfur capacity with the successive cycle operation.

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