Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids

Gan, YY; Chen, W-H; Ong, HC; Lin, Y-Y; Sheen, H-K; Chang, J-S; Ling, TC

Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids

Gan, YY Chen, W-H Ong, HC Lin, Y-Y Sheen, H-K Chang, J-S Ling, TC

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Energy Conversion and Management, 2021, 227
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Gan, YY
dc.contributor.author	Chen, W-H
dc.contributor.author	Ong, HC
dc.contributor.author	Lin, Y-Y
dc.contributor.author	Sheen, H-K
dc.contributor.author	Chang, J-S
dc.contributor.author	Ling, TC
dc.date.accessioned	2022-04-18T23:08:37Z
dc.date.available	2022-04-18T23:08:37Z
dc.date.issued	2021-01-01
dc.identifier.citation	Energy Conversion and Management, 2021, 227
dc.identifier.issn	0196-8904
dc.identifier.issn	1879-2227
dc.identifier.uri	http://hdl.handle.net/10453/156353
dc.description.abstract	The experimental results of microalgae pyrolysis kinetics are beneficial to the reactor design in the biomass-to-energy process. To understand the complex pyrolysis process of microalgae, pyrolysis kinetics of microalgae components pretreated by wet torrefaction was evaluated using the independent parallel reaction model. Four and five reaction models were implemented to analyze the pyrolysis kinetics of microalgae Chlorella vulgaris ESP-31 (high-carbohydrate) and FSP-E (high-protein), respectively. Five pseudo-components were required to investigate the microalga FSP-E due to the extra carbonaceous material at temperatures higher than 600 °C. In the pyrolysis TGA curves, the first peak of microalga ESP-31 was diminished whereas only a slight decrease in the first peak of microalga FSP-E for the pretreated microalgae in water and H2SO4 solutions. From the results, pyrolysis kinetics with a fit quality of at least 97% was predicted for both species of microalgae. The activation energy of carbohydrates for microalga ESP-31 was decreased from 221.33 to 64.59 kJ mol−1 after pretreated in H2SO4. In contrast, the activation energies of proteins and lipids were increased for the pretreated microalgae ESP-31. Small changes in the activation energy range of carbohydrates, lipids, and other components were observed for microalga FSP-E compared to microalga ESP-31. On top of that, the thermal degradation temperatures and activation energies of carbohydrates and proteins for the pretreated microalgae ESP-31 and FSP-E displayed the opposite trend. In short, kinetic parameters of microalga ESP-31 could be effectively affected by low-temperature wet torrefaction compared to microalga FSP-E.
dc.language	English
dc.publisher	Elsevier
dc.relation.ispartof	Energy Conversion and Management
dc.relation.isbasedon	10.1016/j.enconman.2020.113609
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering, 0913 Mechanical Engineering
dc.subject.classification	Energy
dc.title	Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
dc.type	Journal Article
utslib.citation.volume	227
utslib.for	0906 Electrical and Electronic Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Information, Systems and Modelling
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-04-18T23:08:36Z
pubs.publication-status	Published
pubs.volume	227

Abstract:

The experimental results of microalgae pyrolysis kinetics are beneficial to the reactor design in the biomass-to-energy process. To understand the complex pyrolysis process of microalgae, pyrolysis kinetics of microalgae components pretreated by wet torrefaction was evaluated using the independent parallel reaction model. Four and five reaction models were implemented to analyze the pyrolysis kinetics of microalgae Chlorella vulgaris ESP-31 (high-carbohydrate) and FSP-E (high-protein), respectively. Five pseudo-components were required to investigate the microalga FSP-E due to the extra carbonaceous material at temperatures higher than 600 °C. In the pyrolysis TGA curves, the first peak of microalga ESP-31 was diminished whereas only a slight decrease in the first peak of microalga FSP-E for the pretreated microalgae in water and H2SO4 solutions. From the results, pyrolysis kinetics with a fit quality of at least 97% was predicted for both species of microalgae. The activation energy of carbohydrates for microalga ESP-31 was decreased from 221.33 to 64.59 kJ mol−1 after pretreated in H2SO4. In contrast, the activation energies of proteins and lipids were increased for the pretreated microalgae ESP-31. Small changes in the activation energy range of carbohydrates, lipids, and other components were observed for microalga FSP-E compared to microalga ESP-31. On top of that, the thermal degradation temperatures and activation energies of carbohydrates and proteins for the pretreated microalgae ESP-31 and FSP-E displayed the opposite trend. In short, kinetic parameters of microalga ESP-31 could be effectively affected by low-temperature wet torrefaction compared to microalga FSP-E.

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