Simulation of Gas-Solid Flow in Slug Coolers
of Circulating Fluidized Beds
Xu Yongquan,Li Yongxing,Yang Dong,Chen Tingkuan
(State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University,
Xi'an 710049, China)
Abstract: Numerical simulation of gas-solid flow in slug coolers of circulating
fluidized beds characterized by high granular concentration, strong interactions among
particles was performed, which was based on an Eulerian approach. The Eulerian formulation
of mass balances and moment balances equations treated physically isolated particles as a
continuous phase with the use of the kinetic theory of granular flow. The flux of
discharged ash and flow patterns at different moments are obtained and compared to the
experimental results for the slug cooler. Good agreements are obtained and the errors of
the flux of discharged ash between computations and experiments lay in the range of ¡À25%.
The result indicates that the model used is proper to predict the gas-solid flow in slug
coolers. The motion of gas and solid was further investigated considering bubble¡¯s
generation, growth, and rip, and it is found that the motion depends strongly on the bed
position and bubble position.
Keywords: gas-solid flow; slug cooler; Eulerian approach; numerical simulation