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

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 p...

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Main Authors: Gan, Yong Yang, Chen, Wei-Hsin, Ong, Hwai Chyuan, Lin, Yu-Ying, Sheen, Herng-Kuang, Chang, Jo-Shu, Ling, Tau Chuan
Format: Article
Published: Elsevier 2021
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QC Physics
Online Access:http://eprints.um.edu.my/28652/
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spelling my.um.eprints.286522022-04-06T05:29:27Z http://eprints.um.edu.my/28652/ Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids Gan, Yong Yang Chen, Wei-Hsin Ong, Hwai Chyuan Lin, Yu-Ying Sheen, Herng-Kuang Chang, Jo-Shu Ling, Tau Chuan QC Physics 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 degrees 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. Elsevier 2021-01-01 Article PeerReviewed Gan, Yong Yang and Chen, Wei-Hsin and Ong, Hwai Chyuan and Lin, Yu-Ying and Sheen, Herng-Kuang and Chang, Jo-Shu and Ling, Tau Chuan (2021) Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids. Energy Conversion and Management, 227. ISSN 0196-8904, DOI https://doi.org/10.1016/j.enconman.2020.113609 <https://doi.org/10.1016/j.enconman.2020.113609>. 10.1016/j.enconman.2020.113609
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
spellingShingle QC Physics
Gan, Yong Yang
Chen, Wei-Hsin
Ong, Hwai Chyuan
Lin, Yu-Ying
Sheen, Herng-Kuang
Chang, Jo-Shu
Ling, Tau Chuan
Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
description 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 degrees 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.
format Article
author Gan, Yong Yang
Chen, Wei-Hsin
Ong, Hwai Chyuan
Lin, Yu-Ying
Sheen, Herng-Kuang
Chang, Jo-Shu
Ling, Tau Chuan
author_facet Gan, Yong Yang
Chen, Wei-Hsin
Ong, Hwai Chyuan
Lin, Yu-Ying
Sheen, Herng-Kuang
Chang, Jo-Shu
Ling, Tau Chuan
author_sort Gan, Yong Yang
title Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
title_short Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
title_full Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
title_fullStr Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
title_full_unstemmed Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
title_sort effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
publisher Elsevier
publishDate 2021
url http://eprints.um.edu.my/28652/
_version_ 1735409567537299456
score 13.211869

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