Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Study on Reactivity of Zinc-Based Sorbents

아연계흡수제의 반응특성 규명연구

  • 연장희 (충남대학교 화학공학과) ;
  • 이영우 (충남대학교 화학공학과) ;
  • 이창근 (한국에너지 기술연구소 에너지환경연구부)
  • Published : 1998.03.01
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Abstract

In this research, effects of the types and amounts of binders and additives on desulfurization and regeneration reactivities of zinc titanate were investigated. Bentonite and kaolinite were used as binders and Mo-based, Ni-based, and Cu-based compounds were used as additives. A thermogravimetric analyzer (TGA) was utilized to investigate reactivities of desulfurization and regeneration for each sorbent. Two-cycle reactions of desulfurization-regeneration were performed in the TGA reactor. Results of XRD analysis showed that all sorbents had the crystalline phases of $Zn_2TiO_2$ and $Zn_2Ti_3O_8$ irrespective of the type and amount of binder and additive. Kaolinite-bound sorbents gave higher surface areas than bentonite-bound ones and the surface areas and pore volumes of sorbents increased with amount of binder increased. It was found that the most suitable temperatures for desulfurization and regeneration were 680$^{\circ}$C and 730$^{\circ}$C, respectively, and the sorbent prepared by the addition of 3 mol% CuO showed the best performance in terms of desulfurization and regeneration. Nio-added sorbents had good regenerability whereas $MoO_3-based$ sorbents showed poor performance. In cycle experiments in a fixed bed reactor 3 mol% CuO-added sorbents showed high reactivity.

본 연구에서는 ZnO 및 TiO2의 혼합소결시에 접합제 및 첨가제의 종류 및 구성비가 아연계 흡수제의 탈황 및 재생반응 특성에 미치는 영향을 분석하였다. 접합제로 bentomite와 kaolinite를, 첨가제로는 Mo계, Ni계, Cu계를 선정하여 함량을 변화시켰다. 흡수제에 대한 탈황-재생-탈황반응의 반복실험을 위해 연천칭분석기(TGA)계를 조립하여 각 흡수제에 대해 탈황-재생반응의 2사이클 반복실험특성을 조사하였다. XRD분석결과 접합제 및 첨가제의 종류 및 함량에 관계없이 대부분 Zn2 TiO4 와 Zn2 TiO8가 형성됨을 확인하였다. Kaolinite를 접합제로 사용한 탈황제의 표면적이 더 컸으며 접합제의 함량이 증가할수록 표면적과 세공부피는 증가하였다. 탈황반응은 68$0^{\circ}C$, 재생반응은 73$0^{\circ}C$가 적합하였으며 3 mol%의 CuO를 첨가제로 사용한 경우 탈황과 재생반응이 모두 우수하였다. NiO를 첨가제로 사용한 경우 재생성이 우수하였으며 MoO3를 첨가제로 사용한 경우 성능이 우수하지 못하였다. 3 mol%의 CuO를 첨가제로 사용한 흡수제에 대해 고정층에서 연속반복반응실험을 한 결과 반응성이 높게 유지되었다.

Keywords

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