CFD simulation of gas-particle flow in gas-solid fluidized bed
Abstract
The gas-solid fluidized bed is widely used in industry due to its excellent
operability and generality. It can not only realize the physical processes between
gas and solid phases, such as heat transfer, mass transfer, transportation,
adsorption, etc. As a reactor, chemical reactions such as combustion, synthesis,
cracking, and gasification are accelerated by fluidization techniques. As the core
mechanism of gas-solid fluidized bed, multiphase flow is the key to develop and
improve the gas-solid fluidized bed. However, due to the complex motion and
interaction among the components of multiphase flow, it is impossible to solve
practical problems based on theoretical knowledge alone. With the development
of computer technology and hardware, the research on gas-solid phase flow by
computer has achieved good results, and even can provide basis and conditions
for industrial scale-up fluidized bed. Under the condition of the same gas-solid
fluidized bed CFD model, control variates is taken to analyze the sensitivity of the
gas-solid fluidized bed system in this paper.
Fluent software is one of the most widely used and comprehensive CFD
software. It can adjust the grid according to the calculation results. The grid
generation program is very effective. Therefore, in this experiment, Fluent is
selected as the calculation software and ICEM-CFD as the mesh generation
software. In this paper, we adopt the Euler-Euler model to study the seven
operating parameters about particle collision coefficient, drag model, inlet gas
velocity, initial bed height, gas type, particle diameter, and solid density.
Compared with the value of pressure drop and solid volume fraction, the particle
collision coefficient has the least influence on the above conditions, while the
density, particle size and gas velocity of solid phase have influence on the
calculation results obviously.
We hope that the study and simulation of CFD software such as Fluent and
ICEM can promote us to understand the mechanism of gas-solid flow more deeply
and sum up the main factors of the fluidized bed system in order to provide some
help for the optimization and design of gas-solid fluidized bed.
Key Words： gas-solid fluidized bed， Euler-Euler model， control
variates， pressure contour，volume fraction contour
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