Minimum bubbling fluidization velocity in a supercritical water fluidized bed acquired by the dual-capacitance probe method

2019 ◽  
Vol 199 ◽  
pp. 359-370 ◽  
Author(s):  
Jikai Huang ◽  
Youjun Lu ◽  
Hao Wang
Keyword(s):  
Fluidized Bed ◽  
Supercritical Water ◽  
Probe Method ◽  
Fluidization Velocity ◽  
Capacitance Probe

scholarly journals Three-dimensional numerical study on flow dynamics characteristics in supercritical water fluidized bed with consideration of real particle size distribution by computational particle fluid dynamics method

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401877987 ◽  
Author(s):  
Zhenqun Wu ◽  
Hui Jin ◽  
Guobiao Ou ◽  
Liejin Guo ◽  
Changqing Cao
Keyword(s):  
Fluid Dynamics ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Supercritical Water ◽  
Expansion Process ◽  
Fluidization Velocity ◽  
Bed Expansion ◽  
Dynamics Method

Supercritical water fluidized bed is a promising reactor which can realize the efficient and clean gasification of coal to produce hydrogen. As the high pressure and temperature inside supercritical water fluidized bed, the study of the detail flow behaviors needs the help of numerical method. Considering the limitation of the two-fluid method and discrete element method, the computational particle fluid dynamics method was applied to this work. When particle size distribution was taken into consideration, the simulated results showed that the transformation from fixed bed regime to fluidized bed regime is a gradual process. With the increase in superficial fluid velocity, particles in small diameter migrate to the top of the bed and there exits layering phenomenon in the bed. Besides, though the particles are categorized as Geldart B group, the minimum fluidization velocity is not equal to the minimum bubbling fluidization velocity and there is a complicated bed expansion process after incipient fluidization. The bed expansion process is also influenced by the particle size distribution.

scholarly journals Prediction of minimum fluidization velocity in pulsed gas–solid fluidized bed

2020 ◽  
pp. 127965
Author(s):  
Yanjiao Li ◽  
Chenyang Zhou ◽  
Guannan Lv ◽  
Yongxin Ren ◽  
Yuemin Zhao ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Minimum Fluidization Velocity ◽  
Fluidization Velocity ◽  
Minimum Fluidization

Solid Holdup Dynamics of a Step Change in Liquid Fluidization Velocity within a Liquid–Solid Fluidized Bed

2006 ◽  
Vol 39 (8) ◽  
pp. 798-806
Author(s):  
Di Li ◽  
Kei Mizuta ◽  
Kazuki Ishihata ◽  
Toshihiko Kamiya ◽  
Hidetomo Shirai ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Step Change ◽  
Fluidization Velocity ◽  
Solid Holdup ◽  
Liquid Fluidization
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