The 90th Hiroshima University Biomass Evening Seminar(The75th Hiroshima University ACE Seminar)

The90th Hiroshima University Biomass Evening Seminar

(The75th Hiroshima University ACE Seminar) was held.


Date & Time: Tue.1 Dec., 2020   16:20-17:50

Place: Engineering 110 Lecture Room, Higashi-Hiroshima Campus, Hiroshima University



Commentary: Yukihiko MATSUMURA

Professor, Graduate School of Advanced Science and Engineering, Hiroshima University


Lecture: Yukihiko MATSUMURA

Professor, Graduate School of Advanced Science and Engineering, Hiroshima University

“Possible collaboration related to biomass field: Activities of Hiroshima University Advanced Core for Energetics”


Collaboration is not always easy.  This is because common sense in one field is not so for researchers in another field, and what you need is not provided as it is.  Still, when it works, collaboration results in very fruitful outcome.  As an example of useful collaboration, activity of Hiroshima University Advanced Core for Energetics (HU-ACE) is introduced.  Since its foundation in 2016, members of HU-ACE have collaborated from one project to another.  In relation to biomass, Hiroshima scenario was developed by the mutual understanding of the energy researchers and collaborative projects are successful to get funding. 


Lecture: Pattraporn CHANGSUWAN

D3 student, Graduate School of Engineering, Hiroshima University

“Char formation from guaiacol in supercritical water gasification “


Supercritical water gasification (SCWG) is suitable technology with synergistic application of renewable energy and waste processing.  However, the char formation produced by side reactions will cause plugging in the reactor when in operation for a long time and reduces carbon gasification efficiency in the process.  This study investigated the decomposition of shochu residue (Japanese distilled liquor) as actual biomass and guaiacol as model compound of lignin to predict carbon product yield and conversion efficiency during the gasification of both types of biomass. Shochu residue and guaiacol were conducted in a continuous flow reactor at a temperature of 600 °C and pressure of 25 MPa. Firstly, to design the supercritical water gasification reactor, it is always needed to determine the gasification characteristics of the actual feedstock. Considering that most of the wet organic waste is composed of solid and liquid components. The secondary studies that investigated the effect of guaiacol concentration (0.05-1.0 wt%) and residence time (5-94 s) on the carbon production yield and gas composition. Solid yields increased with increased feedstock concentration, reflecting an order of reaction greater than one for solid production. A reaction model was developed, and the reaction rate constants were determined successfully to reproduce experimental results. Finally, the interaction between guaiacol and radical scavengers like acetic acid was elucidated.  It was found that acetic acid is a good radical scavenger for inhibiting radical char formation from guaiacol under SCWG conditions. The interaction parameters indicated that adding acetic acid has a significant effect on the product yields, especially char yield.


Chair: Yukihiko MATSUMURA

Professor, Graduate School of Advanced Science and Engineering, Hiroshima University