Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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A Study on Reactivity of Iron-based Sorbents for $H_2S$ Removal

$H_2S$ 제거를 위한 철광석계 흡수제의 반응 특성 연구

Lee, Hae-Pyeong;Oh, Sea-Cheon;Yoon, Suk-Il;Kim, Hee-Taik
이해평;오세천;윤석일;김희택

  • Published : 20040400
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Abstract

To reduce $H_2S$ in the gas stream of IGCC process, the $H_2S$ sorption capacities of iron-based sorbent were examined at the temperature range of $400{\sim}700\;^{\circ}C$ with lab scale fixed-bed reactor. The $H_2S$ sorption capacities of sorbents increased with the temperature of sulfidation reaction but decreased above $600\;^{\circ}C$ due to the instability of sorbents. The effect of additives such as $Cr_2O_3,\;MnO,\;Co_2O_3,\;Ni_2O_3$ and phosphorus were investigated. Among them $Co_2O_3$ additive showed relatively higher $H_2S$ sorption capacity. The optimum content of phosphorus turned out to be about 2% although the $H_2S$ sorption capacity decreased. During the 5-cycle sulfidation/regeneration reaction in the fixed-bed reactor, all sorbents studied here maintained 90% of the initial $H_2S$ sorption capacity of their fresh samples.

Integrated Gasification Combined Cycle (IGCC)의 합성가스 중에 있는 $H_2S$를 제거하기 위해서 고정층 반응기를 이용하여 $400{\sim}700\;^{\circ}C$의 온도 구간에서 철광석계 흡수제의 $H_2S$ 흡수능을 고찰하였다. $H_2S$ 흡수능은 탈황반응의 온도가 증가함에 따라 증가하였지만 $600^{\circ}C$의 온도 이상에서는 흡수제의 열적 불안정성에 기인하여 감소하였다. $Co_2O_3,\;Ni_2O_3,\;Cr_2O_3,\;MnO$와 인의 첨가물 효과를 살펴본 결과, $Co_2O_3$를 첨가한 흡수제의 탈황성능이 가장 우수한 것으로 나타났으며, 흡수능이 감소할지라도 인의 최적 함량은 2% 정도임을 확인할 수 있었다. 본 연구에서는 흡수제를 5회 반복 황화/재생시켜 실험을 수행하였는데 초기 흡수능의 90% 정도를 유지하는 것으로 나타났다.

Keywords

References

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