期刊
RENEWABLE ENERGY
卷 140, 期 -, 页码 751-760出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.03.095
关键词
Multiphase; Turbulence; Biomass pyrolysis; Euler-Lagrange; CFD; Riser
资金
- National Science Foundation Graduate Research Fellowship
This work presents a numerical study of biomass pyrolysis in turbulent riser flow. Eulerian Lagrangian simulations of unbounded sedimenting gas-solid flows are performed to isolate the effects of particle clustering on the production of syngas and tar. This configuration provides a framework to resolve the relevant length- and time-scales associated with thermal, chemical and multiphase processes taking place in the fully-developed region of a circulating fluidized bed riser. A four-step kinetic scheme is employed to model the devolatilization of biomass particles and secondary cracking of tar. Two-way coupling between the phases leads to clusters of sand particles that generate and sustain gas-phase turbulence and transport biomass particles. Neglecting the heterogeneity caused by clusters was found to lead to a maximum over-prediction of syngas yield of 33%. Further, it was found that two-dimensional simulations over-predict the level of clustering, resulting in an under-prediction of syngas and tar yields. (C) 2019 Elsevier Ltd. All rights reserved.
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