Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification
Hydrothermal gasification (HTG) experiments were carried out to extract hydrogen from biomass. Although extensive research has been conducted on hydrogen production with HTG, limited research exists on the use of biochar as a raw material. In this study, woodland residues (wood chip) and biochar fro...
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doaj-ffee97ea4af145a8ba82381e2985b5fb2021-07-15T15:32:58ZengMDPI AGEnergies1996-10732021-06-01143793379310.3390/en14133793Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal GasificationBingyao Zeng0Naoto Shimizu1Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Hokkaido, JapanField Science Center for Northern Biosphere, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Hokkaido, JapanHydrothermal gasification (HTG) experiments were carried out to extract hydrogen from biomass. Although extensive research has been conducted on hydrogen production with HTG, limited research exists on the use of biochar as a raw material. In this study, woodland residues (wood chip) and biochar from wood-chip pyrolysis were used in HTG treatment to generate hydrogen. This research investigated the effect of temperature (300–425 °C) and biomass/water (0.5–10) ratio on gas composition. A higher temperature promoted hydrogen production because the water–gas shift reaction and steam-reforming reaction were promoted with an increase in temperature. The methane concentration was related positively to temperature because of the methanation and hydrogenation reactions. A lower biomass/water ratio promoted hydrogen production but suppressed carbon-monoxide production. Most reactions that produce hydrogen consume water, but water also affects the water–gas shift reaction balance, which decreases the carbon-monoxide concentration. By focusing on the practical application of HTG, we attempted biochar treatment by pyrolysis (temperature of heating part: 700 °C), and syngas was obtained from hydrothermal treatment above 425 °C.https://www.mdpi.com/1996-1073/14/13/3793hydrothermal gasificationpyrolysishydrogen productionbioenergy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bingyao Zeng Naoto Shimizu |
spellingShingle |
Bingyao Zeng Naoto Shimizu Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification Energies hydrothermal gasification pyrolysis hydrogen production bioenergy |
author_facet |
Bingyao Zeng Naoto Shimizu |
author_sort |
Bingyao Zeng |
title |
Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification |
title_short |
Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification |
title_full |
Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification |
title_fullStr |
Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification |
title_full_unstemmed |
Hydrogen Generation from Wood Chip and Biochar by Combined Continuous Pyrolysis and Hydrothermal Gasification |
title_sort |
hydrogen generation from wood chip and biochar by combined continuous pyrolysis and hydrothermal gasification |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2021-06-01 |
description |
Hydrothermal gasification (HTG) experiments were carried out to extract hydrogen from biomass. Although extensive research has been conducted on hydrogen production with HTG, limited research exists on the use of biochar as a raw material. In this study, woodland residues (wood chip) and biochar from wood-chip pyrolysis were used in HTG treatment to generate hydrogen. This research investigated the effect of temperature (300–425 °C) and biomass/water (0.5–10) ratio on gas composition. A higher temperature promoted hydrogen production because the water–gas shift reaction and steam-reforming reaction were promoted with an increase in temperature. The methane concentration was related positively to temperature because of the methanation and hydrogenation reactions. A lower biomass/water ratio promoted hydrogen production but suppressed carbon-monoxide production. Most reactions that produce hydrogen consume water, but water also affects the water–gas shift reaction balance, which decreases the carbon-monoxide concentration. By focusing on the practical application of HTG, we attempted biochar treatment by pyrolysis (temperature of heating part: 700 °C), and syngas was obtained from hydrothermal treatment above 425 °C. |
topic |
hydrothermal gasification pyrolysis hydrogen production bioenergy |
url |
https://www.mdpi.com/1996-1073/14/13/3793 |
work_keys_str_mv |
AT bingyaozeng hydrogengenerationfromwoodchipandbiocharbycombinedcontinuouspyrolysisandhydrothermalgasification AT naotoshimizu hydrogengenerationfromwoodchipandbiocharbycombinedcontinuouspyrolysisandhydrothermalgasification |
_version_ |
1721299860114636800 |