CFD simulation via conventional Two-Fluid Model of a circulating fluidized bed riser: Influence of models and model parameters on hydrodynamic behavior

2015 ◽  
Vol 272 ◽  
pp. 260-268 ◽  
Author(s):  
Mukesh Upadhyay ◽  
Jong-Ho Park
Keyword(s):  
Fluidized Bed ◽  
Cfd Simulation ◽  
Circulating Fluidized Bed ◽  
Fluid Model ◽  
Model Parameters ◽  
Hydrodynamic Behavior ◽  
Two Fluid Model ◽  
Two Fluid

scholarly journals Catalytic Cracking of Heavy Oil from Waste Plastic in Tapered Circulating Fluidized Bed Riser Reactor

2020 ◽  
Vol 141 ◽  
pp. 01012
Author(s):  
Parinya Khongprom ◽  
Thanapat Whansungnoen ◽  
Permsak Pienduangsri ◽  
Waritnan Wanchan ◽  
Sunun Limtrakul
Keyword(s):  
Fluidized Bed ◽  
Heavy Oil ◽  
Catalytic Cracking ◽  
Circulating Fluidized Bed ◽  
Fluid Model ◽  
Plastic Waste ◽  
Hydrodynamic Behavior ◽  
Continuous Increase ◽  
Waste Plastic ◽  
Two Fluid Model

Because of the continuous increase in the amount of plastic waste, catalytic cracking is an interesting method that could be used to convert heavy oil from thermal cracking of plastic waste into fuel. The objective of this study was to investigate the hydrodynamic behavior and the performance of catalytic cracking of heavy oil in a circulating fluidized bed reactor using computational fluid dynamics. The two– fluid model incorporated with the kinetic theory of granular flow was applied to predict the hydrodynamic behavior with a reactive flow. Three reactor geometries were studied, which included a conventional riser, tapered–out riser, and tapered–in riser. The four–lump kinetic model was used to describe the catalytic cracking of heavy oil from waste plastic. A core–annulus flow pattern was found in the three reactor geometries. The solid fraction distribution of the tapered reactor was found to be more uniform than that of the conventional riser. The tapered–in riser showed the highest heavy oil conversion with the lowest gasoline selectivity. However, the heavy oil conversion and gasoline selectivity of the conventional and tapered–out reactors were not significantly different.

Bubbling Flow in a Multi-Jet Fluidized Bed

2020 ◽  
Author(s):  
Liwu Wang ◽  
Sijun Zhang
Keyword(s):  
Fluidized Bed ◽  
Fluidized Beds ◽  
Fluid Model ◽  
Bubble Formation ◽  
Model Parameters ◽  
Phase Flow ◽  
Two Phase ◽  
Single Jet ◽  
Two Fluid Model ◽  
Two Fluid

Abstract This work concerns with numerical simulation of dense gas-particle two-phase flow in a fluidized bed in the framework of two-fluid model, where attention is given to the bubble formation in a single-jet and multi-jet fluidized beds. The kinetic theory is implemented in the model to avoid empirically determined model parameters. The validity of the approach is confirmed through the comparison between the computed results and the measurements in the literature. The results show that increasing the number of jets results in different behavior in bubble formation and the flow pattern in a multi-jet bed is much more complex than that in a single-jet bed.

Simulations of vertical jet penetration using a filtered two-fluid model in a gas–solid fluidized bed

Particuology ◽  
2017 ◽  
Vol 31 ◽  
pp. 95-104 ◽  
Author(s):  
Shuyan Wang ◽  
Baoli Shao ◽  
Xiangyu Li ◽  
Jian Zhao ◽  
Lili Liu ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluid Model ◽  
Jet Penetration ◽  
Two Fluid Model ◽  
Two Fluid ◽  
Vertical Jet

Two-Fluid Model Simulations of the National Energy Technology Laboratory Bubbling Fluidized Bed Challenge Problem

2016 ◽  
Vol 55 (17) ◽  
pp. 5063-5077 ◽  
Author(s):  
Musango Lungu ◽  
Haotong Wang ◽  
Jingdai Wang ◽  
Yongrong Yang ◽  
Fengqiu Chen
Keyword(s):  
Fluidized Bed ◽  
Fluid Model ◽  
Energy Technology ◽  
Model Simulations ◽  
Bubbling Fluidized Bed ◽  
Two Fluid Model ◽  
Two Fluid

Simulation Study of Gas-Solid Macro-Mixing Characterization in Small Fixed-Fluidized Bed Reactor

2011 ◽  
Vol 236-238 ◽  
pp. 1537-1545
Author(s):  
Wen Jing Liu ◽  
Hui Zhao ◽  
Chao He Yang ◽  
Hong Hong Shan
Keyword(s):  
Fluidized Bed ◽  
Raw Materials ◽  
Fluid Model ◽  
Structural Parameters ◽  
Flow Behavior ◽  
Fluidized Bed Reactor ◽  
Operating Conditions ◽  
Laboratory Evaluation ◽  
Two Fluid Model ◽  
Two Fluid

In fixed-fluidized bed reactor, laboratory evaluation of different catalyst, raw materials and process parameters can be implemented, so it has wide applications in the refining process. In this study, we focused on small fixed-fluidized bed reactor, using Eulerian-Eulerian two-fluid model, simulated the gas-solid flow behavior in it. Gas residence time distribution was measured in order to characterize macro-mixing. At the same time, by changing the reactor structure and operating conditions, we studied their effects on gas-solid macro-mixing characterization. The results show that the effects of structural parameters are larger than operating conditions, and different parameters have different effects. Different parameters can be adjusted to change the gas-solid macro-mixing characterization in small fixed-fluidized bed reactor. Therefore, the small fixed-fluidized bed reactor can provide better results in more application areas.

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