Product characteristics of torrefied wood sawdust in normal and vacuum environments

Yi Kai Chih, Wei Hsin Chen, Hwai Chyuan Ong, Pau Loke Show

研究成果: Article

摘要

To investigate the efficacy of torrefaction in a vacuum environment, wood sawdust was torrefied at various temperatures (200-300 C) in different atmospheres (nitrogen and vacuum) with different residence times (30 and 60 min). It was found that the amount of biochar reduced at the same rate-regardless of atmosphere type-throughout the torrefaction process. In terms of energy density, the vacuum system produced biochar with better higher heating value (HHV, MJ/kg) than the nitrogen system below 250 C. This was the case because the moisture and the high volatility compounds such as aldehydes diffused more easily in a vacuum. Over 250 C, however, a greater amount of low volatility compounds evaded from the vacuum system, resulting in lower higher heating value in the biochar. Despite the mixed results with the solid products, the vacuum system increased the higher heating value of its liquid products more significantly than did the nitrogen system regardless of torrefaction temperature. It was found that 23% of the total energy output came from the liquid products in the vacuum system; the corresponding ratio was 19% in the nitrogen system. With liquid products contributing to a larger share of the total energy output, the vacuum system outperformed the nitrogen system in terms of energy density.

原文English
文章編號3844
期刊Energies
12
發行號20
DOIs
出版狀態Published - 2019 十月 11

指紋

Sawdust
Wood
Vacuum
Nitrogen
Heating
Liquid
Energy Density
Volatility
Liquids
Atmosphere
Residence Time
Output
Aldehydes
Moisture
Energy
Efficacy
Temperature

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

引用此文

Chih, Yi Kai ; Chen, Wei Hsin ; Ong, Hwai Chyuan ; Show, Pau Loke. / Product characteristics of torrefied wood sawdust in normal and vacuum environments. 於: Energies. 2019 ; 卷 12, 編號 20.
@article{f59a563c7b654831b98fe979c0c45cb9,
title = "Product characteristics of torrefied wood sawdust in normal and vacuum environments",
abstract = "To investigate the efficacy of torrefaction in a vacuum environment, wood sawdust was torrefied at various temperatures (200-300 ◦C) in different atmospheres (nitrogen and vacuum) with different residence times (30 and 60 min). It was found that the amount of biochar reduced at the same rate-regardless of atmosphere type-throughout the torrefaction process. In terms of energy density, the vacuum system produced biochar with better higher heating value (HHV, MJ/kg) than the nitrogen system below 250 ◦C. This was the case because the moisture and the high volatility compounds such as aldehydes diffused more easily in a vacuum. Over 250 ◦C, however, a greater amount of low volatility compounds evaded from the vacuum system, resulting in lower higher heating value in the biochar. Despite the mixed results with the solid products, the vacuum system increased the higher heating value of its liquid products more significantly than did the nitrogen system regardless of torrefaction temperature. It was found that 23{\%} of the total energy output came from the liquid products in the vacuum system; the corresponding ratio was 19{\%} in the nitrogen system. With liquid products contributing to a larger share of the total energy output, the vacuum system outperformed the nitrogen system in terms of energy density.",
author = "Chih, {Yi Kai} and Chen, {Wei Hsin} and Ong, {Hwai Chyuan} and Show, {Pau Loke}",
year = "2019",
month = "10",
day = "11",
doi = "10.3390/en12203844",
language = "English",
volume = "12",
journal = "Energies",
issn = "1996-1073",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "20",

}

Product characteristics of torrefied wood sawdust in normal and vacuum environments. / Chih, Yi Kai; Chen, Wei Hsin; Ong, Hwai Chyuan; Show, Pau Loke.

於: Energies, 卷 12, 編號 20, 3844, 11.10.2019.

研究成果: Article

TY - JOUR

T1 - Product characteristics of torrefied wood sawdust in normal and vacuum environments

AU - Chih, Yi Kai

AU - Chen, Wei Hsin

AU - Ong, Hwai Chyuan

AU - Show, Pau Loke

PY - 2019/10/11

Y1 - 2019/10/11

N2 - To investigate the efficacy of torrefaction in a vacuum environment, wood sawdust was torrefied at various temperatures (200-300 ◦C) in different atmospheres (nitrogen and vacuum) with different residence times (30 and 60 min). It was found that the amount of biochar reduced at the same rate-regardless of atmosphere type-throughout the torrefaction process. In terms of energy density, the vacuum system produced biochar with better higher heating value (HHV, MJ/kg) than the nitrogen system below 250 ◦C. This was the case because the moisture and the high volatility compounds such as aldehydes diffused more easily in a vacuum. Over 250 ◦C, however, a greater amount of low volatility compounds evaded from the vacuum system, resulting in lower higher heating value in the biochar. Despite the mixed results with the solid products, the vacuum system increased the higher heating value of its liquid products more significantly than did the nitrogen system regardless of torrefaction temperature. It was found that 23% of the total energy output came from the liquid products in the vacuum system; the corresponding ratio was 19% in the nitrogen system. With liquid products contributing to a larger share of the total energy output, the vacuum system outperformed the nitrogen system in terms of energy density.

AB - To investigate the efficacy of torrefaction in a vacuum environment, wood sawdust was torrefied at various temperatures (200-300 ◦C) in different atmospheres (nitrogen and vacuum) with different residence times (30 and 60 min). It was found that the amount of biochar reduced at the same rate-regardless of atmosphere type-throughout the torrefaction process. In terms of energy density, the vacuum system produced biochar with better higher heating value (HHV, MJ/kg) than the nitrogen system below 250 ◦C. This was the case because the moisture and the high volatility compounds such as aldehydes diffused more easily in a vacuum. Over 250 ◦C, however, a greater amount of low volatility compounds evaded from the vacuum system, resulting in lower higher heating value in the biochar. Despite the mixed results with the solid products, the vacuum system increased the higher heating value of its liquid products more significantly than did the nitrogen system regardless of torrefaction temperature. It was found that 23% of the total energy output came from the liquid products in the vacuum system; the corresponding ratio was 19% in the nitrogen system. With liquid products contributing to a larger share of the total energy output, the vacuum system outperformed the nitrogen system in terms of energy density.

UR - http://www.scopus.com/inward/record.url?scp=85074909990&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85074909990&partnerID=8YFLogxK

U2 - 10.3390/en12203844

DO - 10.3390/en12203844

M3 - Article

AN - SCOPUS:85074909990

VL - 12

JO - Energies

JF - Energies

SN - 1996-1073

IS - 20

M1 - 3844

ER -