Detailed modeling of hydrogen release and particle shrinkage during pyrolysis of inhomogeneous wood
(2023) In Proceedings of the Combustion Institute 39(3). p.3323-3332- Abstract
Hydrogen release during pyrolysis of woody biomass is studied considering anisotropicity and inhomogeneity of wood structure. A new anisotropic shrinkage model is proposed based on the decomposition of main wood constituents, i.e., cellulose, hemicellulose, and lignin. The new shrinkage model can predict the temporal evolution of the wood structure, and the differences between axial and radial shrinkage during pyrolysis. The model agrees very well with several experimental data from the literature. Based on particle temperature during conversion, the pyrolysis is partitioned into four stages, and the hydrogen release and H2 formation from each stage are investigated. Stage (IV) of pyrolysis, from 1000 to 1273 K, is found to... (More)
Hydrogen release during pyrolysis of woody biomass is studied considering anisotropicity and inhomogeneity of wood structure. A new anisotropic shrinkage model is proposed based on the decomposition of main wood constituents, i.e., cellulose, hemicellulose, and lignin. The new shrinkage model can predict the temporal evolution of the wood structure, and the differences between axial and radial shrinkage during pyrolysis. The model agrees very well with several experimental data from the literature. Based on particle temperature during conversion, the pyrolysis is partitioned into four stages, and the hydrogen release and H2 formation from each stage are investigated. Stage (IV) of pyrolysis, from 1000 to 1273 K, is found to be efficient for H2 production owing to the production of considerable mass of H2 with a minimal amount of tar species. Furthermore, the char quality is found to be different at the end of stages (II), (III), and (IV), where around 67.7, 80.5, and 93.4% wt. of solid residue is made of carbon, respectively. The model is also used to explain how the heating rate affects the temperature distribution inside the particle and how it shifts the peak of hydrogen release. Finally, the pyrolysis of two inhomogeneous wood samples - a beech twig with bark and a beech dowel with growth rings - are investigated. The bark can affect the pyrolysis rate, products, and flow pattern inside the particle. The growth rings do not have a considerable effect on the pyrolysis rate and products, but they have a significant impact on the flow pattern. This has an important implication for char conversion studies where the internal surface area and porosity field distribution have a significant effect on the gasification and oxidation rates.
(Less)
- author
- Mousavi, Seyed Morteza LU ; Ossler, Frederik LU ; Finney, Charles E.A. ; Bai, Xue Song LU and Fatehi, Hesameddin LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Biomass pyrolysis, Hydrogen release, Numerical modeling, Particle shrinkage, Woody biomass
- in
- Proceedings of the Combustion Institute
- volume
- 39
- issue
- 3
- pages
- 3323 - 3332
- publisher
- Elsevier
- external identifiers
-
- scopus:85137427844
- ISSN
- 1540-7489
- DOI
- 10.1016/j.proci.2022.07.108
- project
- Hydrogen in biomass pyrolysis and porous carbonaceous matierials: Energy conversion and storage
- language
- English
- LU publication?
- yes
- id
- 78fd37a1-e91b-4ba4-baa6-8fb8b3194f4e
- date added to LUP
- 2022-11-28 13:09:08
- date last changed
- 2023-11-06 23:43:54
@article{78fd37a1-e91b-4ba4-baa6-8fb8b3194f4e,
abstract = {{<p>Hydrogen release during pyrolysis of woody biomass is studied considering anisotropicity and inhomogeneity of wood structure. A new anisotropic shrinkage model is proposed based on the decomposition of main wood constituents, i.e., cellulose, hemicellulose, and lignin. The new shrinkage model can predict the temporal evolution of the wood structure, and the differences between axial and radial shrinkage during pyrolysis. The model agrees very well with several experimental data from the literature. Based on particle temperature during conversion, the pyrolysis is partitioned into four stages, and the hydrogen release and H<sub>2</sub> formation from each stage are investigated. Stage (IV) of pyrolysis, from 1000 to 1273 K, is found to be efficient for H<sub>2</sub> production owing to the production of considerable mass of H<sub>2</sub> with a minimal amount of tar species. Furthermore, the char quality is found to be different at the end of stages (II), (III), and (IV), where around 67.7, 80.5, and 93.4% wt. of solid residue is made of carbon, respectively. The model is also used to explain how the heating rate affects the temperature distribution inside the particle and how it shifts the peak of hydrogen release. Finally, the pyrolysis of two inhomogeneous wood samples - a beech twig with bark and a beech dowel with growth rings - are investigated. The bark can affect the pyrolysis rate, products, and flow pattern inside the particle. The growth rings do not have a considerable effect on the pyrolysis rate and products, but they have a significant impact on the flow pattern. This has an important implication for char conversion studies where the internal surface area and porosity field distribution have a significant effect on the gasification and oxidation rates.</p>}},
author = {{Mousavi, Seyed Morteza and Ossler, Frederik and Finney, Charles E.A. and Bai, Xue Song and Fatehi, Hesameddin}},
issn = {{1540-7489}},
keywords = {{Biomass pyrolysis; Hydrogen release; Numerical modeling; Particle shrinkage; Woody biomass}},
language = {{eng}},
number = {{3}},
pages = {{3323--3332}},
publisher = {{Elsevier}},
series = {{Proceedings of the Combustion Institute}},
title = {{Detailed modeling of hydrogen release and particle shrinkage during pyrolysis of inhomogeneous wood}},
url = {{http://dx.doi.org/10.1016/j.proci.2022.07.108}},
doi = {{10.1016/j.proci.2022.07.108}},
volume = {{39}},
year = {{2023}},
}