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Search / Korean Journal of Chemical Engineering
Korean Chemical Engineering Research,
Vol.42, No.1, 107-114, 2004
매체순환식 가스연소기 적용을 위한 Ni계 및 NiO계 산소공여입자의 반응특성
Reaction Characteristics of Ni and NiO Based Oxygen Carrier Particles for Chemical-Looping Combustor
류호정, 배달희, 조성호, 진경태
매체순환식 가스연소기에 적용하기 위한 최적의 산소공여입자를 결정하기 위해 금속산화물(NiO)의 함량 변화에 따라 네가지(NiO 26, 44, 58, 78 wt%)의 산소공여입자를 제조하여 열중량 분석기에서 환원반응특성을 측정 및 비교하였다. 제조된 입자들 중에서 NiO 함량이 약 60 wt%인 입자가 산소전달능력 및 반응속도 면에서 다른 입자들에 비해 우수한 성능을 나타내었다. 산소공여입자의 제조과정에서 금속산화물 형태의 영향을 살펴보기 위해 금속산화물의 출발물질로 Ni과 NiO를 사용하여 NiO 함량이 동일한(약 60%) 두 종류의 입자를 제조하였으며 열중량 분석기와 고정층 반응기를 이용하여 반응속도, 재생성, 환원반응 유지시간 및 CO2 선택도 등을 측정 및 고찰하였다. 금속산화물의 출발물질로 NiO를 사용한 입자가 Ni을 사용한 입자에 비해 반복 실험시에 정상반응조건에 빨리 도달하였고 반응속도와 CO2 선택도가 높았으며 환원반응 유지시간이 길게 나타났다. 실험결과에 의해 본 연구에서 고려한 산소공여입자 중에서 금속산화물의 출발물질로 NiO를 사용한 NiO 함량이 60 wt%인 입자를 최적의 산소공여입자로 선정하였다.
To find a suitable oxygen carrier particle for chemical-looping combustor, four kinds of particles (NiO 26, 44, 58, 78 wt%) were prepared and the reactivity of the reduction was measured and investigated by a thermo-gravimetrical analyzer. From the viewpoint of oxygen transfer capacity and reaction rate, the particle containing 60 wt% of NiO showed better performance than the other particles. Also, we have prepared two kinds of oxygen carrier particles to investigate the effect of the starting material for a metal oxide component (i.e., Ni based and NiO based particles, where the weight percents of both samples were set at 60 wt% as NiO). The reaction rate, regenerative ability, duration of the reduction, and CO2 selectivity were measured and investigated by a thermo-gravimetrical analyzer and a fixed bed reactor. The results obtained here indicated that the NiO based oxygen carrier particle containing 60 wt% of NiO showed better regenerative ability, reaction rate, CO2 selectivity, and duration of the reduction, compared with the other particles, therefore we selected this particle as an optimum oxygen carrier particle.
Keywords: Chemical-Looping Combustion; Oxygen Carrier Particle; Nickel oxide
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[Cited By]
  1. Ryu HJ, Kim JW, Jo WK, Park MH, Korean Chemical Engineering Research, 45(5), 506, 2007
  2. Ryu HJ, Shun DW, Bae DH, Park MH, Korean Journal of Chemical Engineering, 26(2), 523, 2009
  3. Lee JK, Kim CG, Bae KK, Park CS, Kang KS, Jeong SU, Kim YH, Joo JH, Cho WC, Korean Chemical Engineering Research, 54(3), 394, 2016
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