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NUMERICAL SIMULATION OF GAS-SOLID TWO PHASE FLOW IN BAGHOUSE DUST COLLECTORS WITH A LOW ENTRY

Hui Gao
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China

Liejin Guo
State Key Laboratory of Multiphase Flow in Power Engineering (SKLMF), Xi'an Jiaotong University, 28 Xianning West Road, Xi'an 710049, Shaanxi, China

Xuejun Chen
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China

Abstract

The gas-solid two-phase flow in a baghouse dust collector and its ameliorated type are numerically predicted in the basis of computational fluid dynamics (CFD) commercial software, FLUENT5.0. The gas phase flow is simulated using a k−ε model, while particle trajectories are computed in a Lagrangian frame of reference. It shows that a recirculation pattern with vortex is formed within the baghouse and the pressure field is nonuniform. The filtration velocity and can velocity exceed the threshold greatly at the rear end. The mechanism which leads bag to failure is exposed. By means of using larger inlet pipe and arranging blunts in the hopper, the flow field in the ameliorated type becomes improved. The recirculation flow with vortex in the original structure has been changed into a three streams pattern directed by the blunts. The filtration velocity and the can velocity become quite uniform.

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