Coupling particle scale model and SuperDEM-CFD for multiscale simulation of biomass pyrolysis in a packed bed pyrolyzer

被引:47
|
作者
Gao, Xi [1 ,2 ]
Yu, Jia [1 ]
Lu, Liqiang [1 ,2 ]
Rogers, William A. [1 ]
机构
[1] Natl Energy Technol Lab, Morgantown, WV 26506 USA
[2] Leidos Res Support Team, Morgantown, WV USA
关键词
biomass; CFD‐ DEM; MFiX; non‐ spherical; pyrolysis; superquadric; HEAT-TRANSFER COEFFICIENTS; DIRECT NUMERICAL-SIMULATION; VERIFICATION; CONDUCTION; KINETICS; MASS;
D O I
10.1002/aic.17139
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
An efficient biomass pyrolysis process requires a comprehensive understanding of the chemical and physical phenomena that occur at multi-length and time scales. In this study, a multiscale computational approach was developed and validated for biomass pyrolysis in a packed-bed reactor by integrating pyrolysis kinetics, a particle scale model, and Superquadric Discrete Element Method-Computational Fluid Dynamics (SuperDEM-CFD) in open-source code MFiX. A one-dimensional particle-scale model that discretizes the characteristic length of biomass particle into layers was developed to predict the intraparticle phenomena inside a single particle. The 1D model was validated by comparing it with a single biomass particle pyrolysis experiment. A recently developed SuperDEM-CFD model was employed to simulate the non-spherical particle-particle contact and fluid-particle interaction. The coupled model was applied to simulate the pyrolysis of cubic biomass particles in a packed bed and validated by comparing with experimental data. Simulation with and without particle-scale model was compared, and the effect of the gas-solid heat transfer models was also investigated.
引用
收藏
页数:15
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