Simulation and prediction of co-combustion of oil shale retorting solid waste and cornstalk in circulating fluidized bed using CPFD method

Jia, Chunxia; Li, Jiawei; Chen, Jiajia; Cui, Shuaishuai; Liu, Hongpeng; Wang, Qing

doi:10.1016/j.applthermaleng.2019.03.145

Cited by 16 publications

(1 citation statement)

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“…As compared with the CFD-DEM, this approach resolves the particle collision through the particle stress gradient instead of accurately determining the collision process. Thus, the MP-PIC method can provide a fast solution to the large-scale dense fluidizing apparatus, becoming more and more popular for modeling the dense two-phase flow currently. − Lan et al numerically explored solid back-mixing in a CFB riser with the MP-PIC method and found that solid back-mixing in the dilute phase transport regime can be attributed to the downward flow of the solid phase near the wall. The numerical work conducted by Chen et al demonstrated that the drag force in computational particle fluid dynamics is overestimated.…”

Section: Introductionmentioning

confidence: 99%

Shape Effect of the Riser Cross Section on the Full-Loop Hydrodynamics of a Three-Dimensional Circulating Fluidized Bed

Yang

Wang

2020

ACS Omega

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In this work, numerical simulation is carried out in a threedimensional full-loop pilot-scale circulating fluidized bed to explore the shape effect of the riser cross section on the typical flow characteristics of the bed via the multiphase particle-in-cell (MP-PIC) method. The gas and solid phases are modeled with the large eddy simulation and Newton's law of motion in the Eulerian and Lagrangian frameworks, respectively. The proposed model has been well validated with experimental data, followed by evaluating the typical core−annulus structure and the nonuniformity of the solid phase distributed along the radial and axial directions of the riser. Then, the particle-scale information of the solid phase distributed in different parts of the system is explored. The results demonstrate that (i) the square riser gives rise to a higher solid inventory in the standpipe owing to the stronger circulation intensity; (ii) the thickness of the solid back-mixing layer reduces along the riser height; the solid back-mixing tends to concentrate in the four corners, while it is not obvious near the sidewalls of the square riser; and (iii) nonuniform distribution of the particle-scale information of the solid phase (e.g., mass, flux, drag force, and slip velocity) can be observed. The square riser gives rise to comparatively more uniform axial mass distribution, a larger rising solid flux, larger horizontal transportation velocity between the core and annulus regions, and a larger horizontal dispersion coefficient in the riser, as compared with the corresponding ones in the circular riser.

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