Investigation on the intra-particle anisotropic transport properties of a beech wood particle during pyrolysis  

作　　者：Andrea Dernbecher Supriya Bhaskaran Nicole Vorhauer-Huget Jakob Seidenbecher Suresh Gopalkrishna Lucas Briest Alba Dieguez-Alonso 

机构地区：[1]TU Dortmund University,Faculty Biochemical and Chemical Engineering,Laboratory of Transport Processes,Emil-Figge-Str.68,44227,Dortmund,Germany [2]Otto-von-Guericke-Universität Magdeburg,Universitätsplatz 2,39106,Magdeburg,Germany

出　　处：《Particuology》2025年第3期172-190,共19页颗粒学报(英文版)

基　　金：the funding by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)-Project-ID 422037413-TRR 287.

摘　　要：In the present study,the influence of the dynamic and anistropic pore microstructure of wood and char samples on the intra-particle flow permeability and tortuosity was investigated.To this end,a beech wood sphere was pyrolysed at different temperatures(100℃,200℃,300℃,400℃,and 500℃)and characterised,after each pyrolysis step,by X-ray micro-computed tomography(μ-CT).From theμ-CT images,the structural geometry of the particle at the different conversion degrees achieved at each temperature level was extracted.The porosity evolution was characterised,accounting for pores larger than 15μm,which was the limit of resolution forμ-CT imaging in this study.The structural geometry was divided in subdomains and used for CFD(computational fluid dynamics)simulations,where the pressure loss at different velocities and in different directions with respect to the main pores(vessel cells)was determined and used to estimate the dynamic and anisotropic permeabilities.The permeability differed by an order of magnitude in the direction of the main pores(vessel cells)in comparison to the perpendicular directions,supporting the need to develop permeability tensors for improved simulations of the pyrolysis process at particle level,accounting for the coupled effects of microstructure,transport,and reaction.

关 键 词：BIOMASS PYROLYSIS Anisotropic pore structure Permeability tensor 

分 类 号：TK6[动力工程及工程热物理—生物能]