Abstract
Internally circulating fluidized bed reactor (ICFB) is the system with combining the function of reactor, cyclones and loop seal of a conventional circulating fluidized bed reactor (CFB) into a single reactor column. In this type of reactor, the reactor column is separated into two sections (riser and downer) by baffles and is linked together via connecting ports. This system is then considered as compact operation when comparing with the conventional CFB reactor. However, the simplicity of the ICFB reactor is trade-off with a gas leakage which takes place between the two sections through the connecting ports. In addition, the solid particle movement inside the system can cause the erosion on the inserting pipes which are used for heating or cooling this ICFB reactor column. In this study, the system hydrodynamics and erosion behavior inside ICFB reactor with inserting pipe were investigated by computational fluid dynamics (CFD) using two-dimensional Eulerian-Eulerian model. The adjusted Gidaspow drag model was applied to compute the interaction between the gas and solid particle phases. Then, the system hydrodynamics was obtained and the wall shear stress was calculated in the existent of the erosion at the surface region of the inserting pipes. The results from this simulation were used to design the inserting pipe arrangement inside this ICFB reactor.
Highlights
The gas and solid particle multiphase flow system is conventionally used in many industrial processes such as chemical, petrochemical, environmental and power production processes [1]
The validation between the experiment and simulation results was conducted to confirm that the developed computational fluid dynamics (CFD) simulation model could represent the Internally circulating fluidized bed reactor (ICFB) reactor
System Hydrodynamics and Erosion Behavior of ICFB with Inserting Pipe The introduction of the inserting pipes was a cause of the increasing of gas velocity in the downer section
Summary
The gas and solid particle multiphase flow system is conventionally used in many industrial processes such as chemical, petrochemical, environmental and power production processes [1]. The solid particles can be circulated in a single reactor column of ICFB by applying this reactor column with unequal fluidizing velocities. The effect of fluidization velocity on solid particle circulation rate and pressure distribution in the ICFB reactor was found. Hassan et al [9] investigated the circulation characteristics of binary mixture of solid particles in ICFB reactor. The development of a CFD model of an ICFB reactor with inserting pipes was investigated to explore system hydrodynamic and erosion behavior. The wall shear stress was used to represent to the erosion behavior at the surface region of the inserting pipes The results from this simulation could be used as a guideline for designing the inserting pipe arrangement inside the ICFB reactor. The pressure profile from the experimental data of Zaabout et al [15] was selected to compare with the obtained CFD simulation data from this study
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