Mixing and segregation of binary mixtures of biomass and silica sand in a fluidized bed

Aiming to better understand the biomass pyrolysis and gasification processes, a detailed experimental study of the mixing characteristics is conducted in a fluidized bed with binary mixtures. Rapeseed is used as biomass, and silica sand or resin as inert material. The effect of mixture composition, initial packing manner, and superficial gas velocity on the concentration distribution is investigated in a rectangular fluidized bed by means of photography and sampling methods. The results show that the mixture composition plays an important role in the axial solids profile of binary mixtures. The mixing behavior of binary mixture is dominated by the bubble movement. The axial distribution of binary mixtures becomes uniform with increasing superficial gas velocity, whilst no obvious effect of initial packing manner is observed in this study.

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Characteristics of Pressure Fluctuations in a Fluidized Bed of Binary Mixtures

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN ◽

10.1252/jcej.38.960 ◽

2005 ◽

Vol 38 (12) ◽

pp. 960-968 ◽

Cited By ~ 2

Author(s):

Zhanyong Li ◽

Noriyuki Kobayashi ◽

Masanobu Hasatani

Keyword(s):

Fluidized Bed ◽

Binary Mixtures ◽

Pressure Fluctuations

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Co-firing of oil palm residues in a fuel staged fluidized-bed combustor using mixtures of alumina and silica sand as the bed material

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2018.08.089 ◽

2018 ◽

Vol 144 ◽

pp. 371-382 ◽

Cited By ~ 6

Author(s):

Vladimir I. Kuprianov ◽

Pichet Ninduangdee ◽

Priatna Suheri

Keyword(s):

Fluidized Bed ◽

Oil Palm ◽

Silica Sand ◽

Bed Material ◽

Fluidized Bed Combustor

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Mixing and segregation behavior in an air dense medium fluidized bed with binary mixtures for dry coal beneficiation

Powder Technology ◽

10.1016/j.powtec.2020.05.094 ◽

2020 ◽

Vol 371 ◽

pp. 161-169 ◽

Cited By ~ 2

Author(s):

Zhijie Fu ◽

Jesse Zhu ◽

Shahzad Barghi ◽

Yuemin Zhao ◽

Zhenfu Luo ◽

...

Keyword(s):

Fluidized Bed ◽

Binary Mixtures ◽

Dense Medium ◽

Segregation Behavior ◽

Coal Beneficiation

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Experimental and Numerical Study of Cold Gas-Solid Flow Regimes in a Fluidized Bed Gasifier

Volume 2: I&C, Digital Controls, and Influence of Human Factors; Plant Construction Issues and Supply Chain Management; Plant Operations, Maintenance, Aging Management, Reliability and Performance; Renewable Energy Systems: Solar, Wind, Hydro and Geothermal; Risk Management, Safety and Cyber Security; Steam Turbine-Generators, Electric Generators, Transformers, Switchgear, and Electric BOP and Auxiliaries; Student Competition; Thermal Hydraulics and Computational Fluid Dynamics ◽

10.1115/power-icope2017-3263 ◽

2017 ◽

Author(s):

Anton Pylypenko ◽

Yevgenii Rastigejev ◽

Lijun Wang ◽

Abolghasem Shahbazi

Keyword(s):

Fluidized Bed ◽

Numerical Study ◽

Three Dimensional ◽

Operating Conditions ◽

Silica Sand ◽

State University ◽

Solid Flow ◽

Fluidized Bed Gasifier ◽

Isothermal Gas ◽

Cold Gas

The objective of this work is to analyze the dynamics and regimes of cold gas-solid flow in a biomass gasifier that is built at North Carolina Agricultural and Technical State University and to identify its corresponding ranges of operating conditions. The value of the minimum fluidization velocity Umf ≈ 8 cm/s has been found experimentally in a series of measurements of a pressure drop in the fluidized bed filled with Gledart type-B silica sand for the range of superficial gas velocities between 0 and 40 cm/s. To complement the experimental results, a set of three-dimensional numerical simulations of the isothermal gas-solid flow based on Eulerian-Eulerian approach has been performed. The analysis of the fluidization characteristics such as axial void fraction distributions has allowed us to evaluate the dependence of the bed expansion ratios from the flow superficial velocity. Good agreement between experimental and numerical results for the considered operating conditions of the gasifier has been observed.

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