Downward Gas-Solids Flow Characteristics in a High-Density Downer Reactor

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概要

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• A specially designed high-density downward gas-solids flow fluidized bed, which is composed of a solids reservoir tank, a solid distributor, an acrylic downer (3.0 m high), a gas-solid separator and a solid receiver tank, was developed to study the fundamentals of high- density downward gas-solids flow characteristics in the downer reactor. Experiments were carried out using two types of sand particles (ρp=2600 kg/m3, dp=80 and 320 µm) as bed materials with superficial downward gas velocities (Ugd) ranging from 0 to 5 m/s. Particle diameter had great effect on the solids mass flux (Gs) and solids hold-up (εs) in the downer. It is found that Gs in a 50 mm diameter downer reached up to 1876 and 815 kg/m2·s, with average εs up to 0.16 and 0.07 in the developed region, for 80 and 320 µm sand, respectively. The solids hold-up decreased with increasing Ugd at a fixed solids mass flux in the developed region. By considering the effects of downer diameters, operating conditions, and solids properties, a correlation for the prediction of dense solids hold-up (εs>0.07) in the developed region of the downer was proposed based on experimental data from the literature and this study.

著者

• Tsutsumi Atsushi

  Collaborative Research Center For Energy Engineering Institute Of Industrial Science The University

• SUZUKI YOSHIZO

  Clean Fuel Research Group, Institute for Energy Utilization, AIST

• Guan Guoqing

  North Japan Research Institute for Sustainable Energy (NJRISE), Hirosaki University

• Fushimi Chihiro

  Department of Chemical Engineering, Tokyo University of Agriculture and Technology

• Ishizuka Masanori

  Collaborative Research Center for Energy Engineering, Department of Mechanical and Biofunctional Systems, Institute of Industrial Science, The University of Tokyo

• Suzuki Yoshizo

  Clean Gas Group, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology

• Tsutsumi Atsushi

  Collaborative Research Center for Energy Engineering, Department of Mechanical and Biofunctional Systems, Institute of Industrial Science, The University of Tokyo

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