The 62nd Hiroshima University Biomass Evening Seminar
(The 29th Hiroshima University ACE Seminar)was held.
Date & Time: Fri .2 Mar., 2018 16:20-17:50
Place: Engineering 110 Lecture Room, Higashi-Hiroshima Campus, Hiroshima University
<Program>
Commentary: Yukihiko MATSUMURA
Professor, Graduate School of Engineering, Hiroshima University
Lecture: Hiroshi ITO
M2 Student,Graduate School of Engineering, Hiroshima University
“Behavior of Organic Compounds and Kelp Cell during Hydrothermal Pretreatment”
Kelp is known as usable resource for renewable energy because it includes fermentable sugar which are alginic acid and mannitol. However, most of the organic matter exist inside the cell membrane. Hydrothermal process can break the cell structure and make this organic matter released. To make the best of the organic matter, the condition to make this release take place should be elucidated. However, it is yet to be decided. The purpose of this study is to indicate the condition where cells of kelp break under hydrothermal pretreatment. In this research, kelp was treated by continuous flow reactor under hydrothermal condition. The experimental condition, temperature was varied from 110 to 190 ℃, pressure was fixed at 5 MPa, and residence time was set at 10 min.The carbon recovery yield in liquid phase was measured using total organic carbon (TOC) analyzer. The state of kelp cell was observed using optical microscope. After hydrothermal pretreatment, the TOC value increaced when treatment temperature is higher than 130 ℃. Observation by the optical microscope confirmed that cell wall of kelp was destroyed at 130 ℃. This results suggests that hydrothermal pretreatment at 130 ℃, 10 min and 5 MPa in hydrothermal pretreatment of kelp is effective for releasing organic matter.
Lecture: Mutsumi KUROKI
B4 Student, School of Engineering, Hiroshima University
1.”Examination of direct sampling from hydrothermal conditions using a capillary tube”
We developed an in situ mass spectrometry (in situ MS) analysis method using capillary tube for the first time. The in situ MS analysis was performed by coupling a tubular batch reactor with a quadrupole mass analyzer via custom-built connection fittings. The products of glucose decomposition were investigated by in situ MS. We conducted experiment at 120℃ and reaction time is 5, 10, 20 minutes. Pressure reduction was successfully made, and MS analysis was conducted. By making the capillary longer, in situ MS should be applied to reactions under pressure higher than that employed in this study.
- “Determination of Hydrothermal Glucose Decomposition Products Using Mass Spectrometry”
We developed an in situ mass spectrometry (in situ MS) analysis method using capillary tube for the first time. The in situ MS analysis was performed by coupling a tubular reactor with a quadrupole mass analyzer via stainless capillary tube. The products of glucose decomposition were investigated by in situ MS. We conducted experiment at 120ºC and reaction time was 5, 10 and 20 min. Pressure reduction was successfully made, and MS analysis was conducted. By making the capillary longer, in situ MS should be applied to reactions under pressure higher than that employed in this study.
Lecture: Satoshi GOTO
M2 Student,Graduate School of Engineering, Hiroshima University
“Discussion on slurry feeding for supercritical water gasification reactor”
Recently biomass energy is attracting attention, but utilization method for wet biomass Can be still developed. Supercritical water gasification is effective to convert wet biomass slurry feedstock into the energy because of water with high reactivity. When such slurry feedstock is used for this gasification, slurry feeder is needed. However there is no solid procedure for feeding slurry and mass balance in many researches are not well closed. That is why this research is focusing on establishing slurry feeder and making sure key parameters of mixing slurry materials. High pressure container was made for this research and the evaluation of this feeder was conducted by the recovery rate with changing the agitation rate, the amount of feedstock and the distance between the plate and the feedstock. In this research, shochu residue and activated carbon was used as slurry feedstock.
Chair: Nattacha PAKSUNG
Researcher , Graduate School of Engineering, Hiroshima University