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Solid mass flux in a chemical-looping process for hydrogen production in a multistage circulating moving bed reactor
Authors:Yoon Seok Hong  Kyoung Soo Kang  Chu Sik Park  Sang Done Kim  Jong Wook Bae  Jae Wook Nam  Yoong Lee  Dong Hyun Lee
Affiliation:1. Department of Chemical Engineering, Sungkyunkwan University, Suwon, Republic of Korea;2. Hydrogen Energy Research Center, KIER, Republic of Korea;3. Department of Chemical and Biomolecular Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
Abstract:
We studied the solid flow characteristics of a multistage circulating moving bed reactor manufactured to produce high purity H2 using a chemical-looping process at high temperature. The reactor was constructed of stainless steel 304 and comprised an inclined fuel reactor ((bottom: 0.07 m, top: 0.16 m) × 0.06 × 1 m3), a steam reactor (0.16 × 0.06 × 1.4 m3), a riser (0.03 × 0.06 × 3.8 m3), two loop-seals (0.03 × 0.06 m2), and a cyclone. Zirconia beads (dp = 186 m, ρp = 3720 kg/m3, Umf = 4.95 × 10−2 m/s, Geldart classification B Group) were used as the bed material. To distribute compressed air, a bubble cap was used as the distributor. Solid mass flux appeared at 6.2–56.4 kg/m2s and the solid mean residence time appeared 92.5–889.3 s in the steam reactor and 75.3–717.7 s in the fuel reactor. Solid mass flux increased with increasing inlet gas velocity into the loop-seal, temperature and the bed height of the steam reactor. However, the solid mean residence time decreased with increasing inlet gas velocity into the loop-seal and the bed height of the steam reactor.
Keywords:Circulating fluidized bed   Loop-seal   Solid mass flux   Flow pattern   High temperature
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