Fluidization Characteristics of Binary Mixtures of Biomass and Quartz Sand in an Acoustic Fluidized Bed

2008 ◽  
Vol 47 (23) ◽  
pp. 9773-9782 ◽  
Author(s):  
Chongdian Si ◽  
Qingjie Guo
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Quartz Sand

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

Particuology ◽  
2021 ◽  
Author(s):  
Tolu Emiola-Sadiq ◽  
Jiachen Wang ◽  
Lifeng Zhang ◽  
Ajay Dalai
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Silica Sand

Characteristics of Pressure Fluctuations in a Fluidized Bed of Binary Mixtures

2005 ◽  
Vol 38 (12) ◽  
pp. 960-968 ◽  
Author(s):  
Zhanyong Li ◽  
Noriyuki Kobayashi ◽  
Masanobu Hasatani
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Pressure Fluctuations

Solids Flow Pattern in the Bottom Zone of a Rectangular Cross-Section Circulating Fluidized Bed

2003 ◽  
Author(s):  
Hong-Shun Li ◽  
Yi-Jun Wang ◽  
Shi-Ping Jin
Keyword(s):  
Flow Pattern ◽  
Fluidized Bed ◽  
Cross Section ◽  
Quartz Sand ◽  
Circulating Fluidized Bed ◽  
Rectangular Cross Section ◽  
Temperature Response ◽  
Cold Model ◽  
Hot Particles ◽  
Bottom Zone

Solids flow pattern in the bottom zone of a rectangular cross-section CFB was investigated by using hot particles as the tracer. The experiments were carried out in a cold model circulating fluidized bed. The riser has an inner cross-section of 0.3 m by 0.5 m and a height of 5.8 m. The solids were returned into the riser at a height of 0.75 m above the air distributor within an angle of about 40 degree. Quartz sand was used as the bed material. The hot particles were also quartz sand but with a little smaller size. Specially designed miniature electrically heating devices were installed flush with the inner bed wall or inside the bed. At each run, about 10–15 cm3 hot particles were slowly pulled into the bed. The temperature response around the device was measured with four copper-constantan thermocouples. Based on the experimental results, a 3-D core-annulus model describing the solids flow pattern in the bottom zone of the CFB riser is proposed.

CFD-DEM Numerical Simulation and Experimental Validation of Heat Transfer and Two-Component Flow in Fluidized Bed

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Feihong Guo ◽  
Zhaoping Zhong
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluidized Bed ◽  
Quartz Sand ◽  
Thermal Imager ◽  
Gas Velocity ◽  
Bed Height ◽  
Two Component ◽  
Superficial Gas Velocity ◽  
Infrared Thermal Imager

AbstractBased on the improved computational fluid dynamics and discrete element method (CFD-DEM), heat transfer and two-component flow of biomass and quartz sand have been studied from experiments and numerical simulation in this paper. During experiments, the particle temperature and moving images are respectively recorded by infrared thermal imager and high speed camera. With the increase of the velocity, the mixing index (MI) and the cooling rate of the particles are rising. Due to larger heat capacity and mass, the temperature of biomass drops slower than that of quartz sand. Fictitious element method is employed to solve the incompatibility of the traditional CFD-DEM where the cylindrical biomass are considered as an aggregation of numerous fictitious sphere particles arranged in certain sequence. By the comparison of data collected by infrared thermal imager and the simulated results, it can be concluded that experimental data is basically agreement with numerical simulation results. Directly affected by inflow air (25℃), the average temperature of particles in the bed height area (h>30 mm) is about 3 degrees lower than that of the other heights. When the superficial gas velocity is larger, the fluidization is good, and the gas temperature distribution is more uniform in the whole area. On the contrary, bubbles are not easy to produce and the fluidization is restricted at lower superficial gas velocity. Gas-solid heat transfer mainly exists under the bed height of 10 mm, and decreases rapidly on fluidized bed height. The mixing index (MI) is employed to quantitatively discuss the mixing effectiveness, which first rises accelerate, then rising speed decreases, finally tends to a upper limit.

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

2020 ◽  
Vol 371 ◽  
pp. 161-169 ◽  
Author(s):  
Zhijie Fu ◽  
Jesse Zhu ◽  
Shahzad Barghi ◽  
Yuemin Zhao ◽  
Zhenfu Luo ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Dense Medium ◽  
Segregation Behavior ◽  
Coal Beneficiation

scholarly journals Mixing Characteristics of Binary Mixture with Biomass in a Gas-Solid Rectangular Fluidized Bed

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2011
Author(s):  
Guiying Wu ◽  
Bangting Yu ◽  
Yanjun Guan ◽  
Xuehui Wu ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Binary Mixture ◽  
Fluidized Bed ◽  
Binary Mixtures ◽  
Silica Sand ◽  
Mixture Composition ◽  
Inert Material ◽  
Gas Velocity ◽  
Mixing Characteristics ◽  
Superficial Gas Velocity ◽  
Initial Packing

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.

Dry coal beneficiation by the semi-industrial Air Dense Medium Fluidized Bed with binary mixtures of magnetite and fine coal particles

Fuel ◽  
2019 ◽  
Vol 243 ◽  
pp. 509-518 ◽  
Author(s):  
Zhijie Fu ◽  
Jesse Zhu ◽  
Shahzad Barghi ◽  
Yuemin Zhao ◽  
Zhenfu Luo ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Dense Medium ◽  
Fine Coal ◽  
Coal Beneficiation ◽  
Coal Particles

Dynamic characteristics of binary mixtures in a two-jet fluidized bed

2011 ◽  
Vol 66 (8) ◽  
pp. 1702-1714 ◽  
Author(s):  
Pei Pei ◽  
Kai Zhang ◽  
Bangting Yu ◽  
Jing Gao ◽  
Guiying Wu ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Dynamic Characteristics

scholarly journals Comparing Active Bed Materials in a Dual Fluidized Bed Biomass Gasifier: Olivine, Bauxite, Quartz-Sand, and Ilmenite

2016 ◽  
Vol 30 (6) ◽  
pp. 4848-4857 ◽  
Author(s):  
Teresa Berdugo Vilches ◽  
Jelena Marinkovic ◽  
Martin Seemann ◽  
Henrik Thunman
Keyword(s):  
Fluidized Bed ◽  
Quartz Sand ◽  
Dual Fluidized Bed ◽  
Bed Materials
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