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Investigating the Effect of Processing Parameters on the Products of Hydrothermal Carbonization of Corn Stover

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Title: Investigating the Effect of Processing Parameters on the Products of Hydrothermal Carbonization of Corn Stover
Authors: Mohammed, Ibrahim Shaba Browse this author
Na, Risu Browse this author
Kushima, Keisuke Browse this author
Shimizu, Naoto Browse this author →KAKEN DB
Keywords: corn stover
hydrothermal liquid
gas fraction
bioenergy management system
Issue Date: 23-Jun-2020
Publisher: MDPI
Journal Title: Sustainability
Volume: 12
Issue: 12
Start Page: 5100
Publisher DOI: 10.3390/su12125100
Abstract: Corn stover is an abundant and underused source of lignocellulose waste biomass that can be transformed into a high-quality energy resource using hydrothermal carbonization (HTC). This investigation has focused on the effect of processing parameters on the products of HTC-namely solid fuel or hydrochar and liquid and gas fractions. HTC was conducted in a temperature-controlled small batch reactor with corn stover and deionized water under oxygen-free conditions obtained by pressurizing the reactor headspace with nitrogen gas. The properties of the hydrochar and liquid and gas fractions were evaluated as a function of the process temperature (250-350 degrees C), residence time (30-60 min) and biomass/water ratio (0.09-0.14). Central composite design modules in a response surface methodology were used to optimize processing parameters. The maximum mass yield, energy yield and high heating value (HHV) of the hydrochar produced were 29.91% dry weight (dw), 42.38% dw and 26.03 MJ/kg, respectively. Concentrations of acetic acid and hydrogen gas were 6.93 g/L and 0.25v/v%, respectively. Experimental results after process optimization were in satisfactory agreement with the predicted HHV. The optimal HTC process parameters were determined to be 305 degrees C with a 60 min residence time and a biomass/water ratio of 0.114, yielding hydrochar with a HHV of 25.42 MJ/kg. The results confirm the feasibility of an alternative corn stover management system.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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