Journal of the Japan Institute of Energy
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 98 (2019), No. 8

  • Characteristic Analysis of Japanese Cedar Powder from Vibration Mill with Ring Media Pulverization Using Solid State NMR

    pp. 171-175

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.171

    We developed vibration mill with ring media as a highly efficient pretreatment technique to obtain monomeric sugar from biomass. The enzymatic digestibility of Japanese cedar powder was improved to 60% by vibration mill with ring media dry pulverization. However, improvement of enzymatic digestibility mechanism was not clarified because of pulverized powder agglomeration. This study investigated the structural change and domain size of a vibration milling with ring media pulverized Japanese cedar powder using solid state NMR. Results show that the between domain size of Japanese cedar powder decreased to 8 nm during 60 min pulverization. A relation was confirmed between domain size and enzymatic digestibility. The enzymatic digestibility was expected to improve by increase surface area through contact by cellulose enzymes. Furthermore, cellulose crystallinity remained almost natural. These results suggest that Japanese cedar powder from vibration milling with ring media can be used as a cellulose nanomaterial. Investigation using ICP-MS was applied to assess the noise of the NMR spectrum from the remnant carbon steel. Results showed no influence of any remnant carbon steel powder. This study clarified the improved enzymatic digestibility mechanism and demonstrated the possibility of cellulose nanomaterial production by dry pulverization.
    x

    Readers Who Read This Article Also Read

    1. Formation and Decomposition of Aromatic Hydrocarbons from High-volatile Coals under High-temperature Pressurized Gasifier Conditions Journal of the Japan Institute of Energy Vol.98(2019), No.11
    2. Thermal Designing of an Inner Cathode Type Alkali Metal Thermal to Electric Conversion (AMTEC) Cell Journal of the Japan Institute of Energy Vol.98(2019), No.11
    3. Homogenization of Heavy Tar and Plastics by Thermal Co-treatment to Prepare Liquid Fuel Feedstock Journal of the Japan Institute of Energy Vol.98(2019), No.11
  • A Study on the Structure of the Stable Inverse Diffusion Flame from the Producer Gas of Woody Biomass: Effects of Concentration of Carbon Dioxide on Partial Combustion

    pp. 176-185

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.176

    An inverse diffusion flame is formed during the partial combustion of the reformed gas for tar reduction in the producer gas generated by the gasification of woody biomass. The polymerization and decomposition of tar occur simultaneously in the vicinity of this inverse diffusion flame. The combustion reaction of producer gas proceeds in the diluted phase. In order to decompose tar without it polymerizing into soot, it is necessary to understand the flame structure. Therefore, this study is aimed at understanding the flame structure of an inverse diffusion flame. In particular, in order to analyze the influence of the diluent, the effect of the concentration of carbon dioxide as an oxidizer on the flame structure and tar decomposition was investigated by observing the CH* chemiluminescence, the planar laser-induced fluorescence (LIF) of polycyclic aromatic hydrocarbons (PAHs), and the laser-induced incandescence (LII) of soot. The results showed that the peak intensities of CH* chemiluminescence, LIF signals from PAHs, and LII signals from soot are distributed in the stated order in a radial direction from the central axis. While PAHs are formed in the upstream of the flame and decrease gradually along the mainstream direction, the relative volume fraction of primary soot particles continued to increase along the mainstream direction. Further, a high carbon dioxide concentration resulted in a longer flame. At the same time, it led to a large volume fraction of soot downstream of the flame. As the concentration of carbon dioxide in the oxidizer increased, carbon yield decreased, suggesting an increase in soot formation.
    x

    Readers Who Read This Article Also Read

    1. Formation and Decomposition of Aromatic Hydrocarbons from High-volatile Coals under High-temperature Pressurized Gasifier Conditions Journal of the Japan Institute of Energy Vol.98(2019), No.11
    2. Thermal Designing of an Inner Cathode Type Alkali Metal Thermal to Electric Conversion (AMTEC) Cell Journal of the Japan Institute of Energy Vol.98(2019), No.11
    3. Homogenization of Heavy Tar and Plastics by Thermal Co-treatment to Prepare Liquid Fuel Feedstock Journal of the Japan Institute of Energy Vol.98(2019), No.11
  • Baseline Study of Greenhouse Gas Emission from Stored Digested Slurry after Separation of Biogas Plant for Dairy Slurry in Spring Snowmelt Period

    pp. 186-193

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.186

    The purpose of this research was to provide an accurate estimate of greenhouse gas (GHG) emissions during the storage of liquid digested slurry after separation (LDSS) produced by a dairy-manure-fed biogas plant in Hokkaido, Japan, in order to create a reliable gas inventory for life-cycle assessment (LCA) of the system. To the best of our knowledge, there have been no case studies measuring GHG generation by anaerobic digesters in such snowy cold regions. Therefore, a GHG measurement method adapted to snowfall and freeze-thaw conditions was newly developed; we measured the amounts of GHGs produced before and after the melting of frozen LDSS at the surface layer of the storage tank during the snowmelt period. The concentrations of CO2, CH4, N2O and NH3 in the LDSS storage tank (above ground, open-type, diameter: 44 m, capacity (effective volume): 6,839 m3 (5,471 m3)) were measured with a multi-gas monitor (infrared photoacoustic detector manufactured by INNOVA) using an openchamber technique. The measurements were conducted at the LDSS storage tank for a biogas plant in Ebetsu City, central Hokkaido, Japan from February 20 to April 3, 2018. This plant processes 29 m3/day, has a fermentation temperature of 40 °C, and hydraulic retention time (HRT) of 40 days. The results revealed that almost no GHG emissions were observed from the frozen storage tank. In addition, when the frozen LDSS began to melt, the GHG emission pattern showed diurnal fluctuations that generally moved in tandem with the ambient temperature. The GHG emissions greatly changed during the period immediately after the frozen LDSS began melting until it melted completely. After the frozen LDSS was melted, CH4, CO2, and N2O emissions were 113.0 mg CH4/m2/day, 88.8 mg CO2/m2/day, and 0.021 mg N2O/m2/day.
  • Preparation and Characterization of Nanocelluloses from Oil Palm Empty Fruit Bunch Cellulose

    pp. 194-201

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.194

    This study aims to prepare nanocelluloses from chemically purified celluloses of oil palm empty fruit bunch (CPC-OPEFB) by using acid hydrolysis. The nanocelluloses from CPC-OPEFB was prepared with sulfuric acid treatment at the concentration of 67 wt% and temperature of 40 ± 1 °C, for 10, 20, 30, and 40 min. As a comparison, nanocelluloses from commercial microcrystalline cellulose (C-MCC) were also prepared with the same condition. The effects of hydrolysis time on the morphology and physical properties of the obtained nanocelluloses were investigated. Observation with TEM showed that nanocelluloses from CPC-OPEFB were long and fibril, whereas the ones from C-MCC showed a rod-like structure and crystalline. This observation was in agreement with the DSC analysis, i.e. the endothermic peaks were not present on the DSC curve of nanocelluloses from CPCOPEFB, whereas it was clearly observed on the DSC curve of nanocelluloses from C-MCC, indicating that the nanocelluloses from CPC-OPEFB were amorph, and the ones from C-MCC were crystalline. The particle size analysis revealed that the diameter of the obtained nanocelluloses was affected by hydrolysis time. The best hydrolysis time to obtain the smallest diameter of NFCs from CPC-OPEFB and NCCs from C-MCC was 30 and 40 min, respectively.
  • Table of Contents (in English)

    p. 9808tce_1

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.9808tce_1

    x

    Readers Who Read This Article Also Read

    1. Preparation and Characterization of Nanocelluloses from Oil Palm Empty Fruit Bunch Cellulose Journal of the Japan Institute of Energy Vol.98(2019), No.8
  • Table of Contents (in Japanese)

    p. 9808tcj_1

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.98.9808tcj_1

Article Access Ranking

24 Jul. (Last 30 Days)

  1. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  2. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Advance Publication
  3. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  4. Effect of Ore Type and Gangue Content on Carburization and Melting Behavior of Carbon-Iron Ore Composite ISIJ International Vol.61(2021), No.6
  5. Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology ISIJ International Vol.61(2021), No.6
  6. Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces ISIJ International Vol.61(2021), No.6
  7. Behavior of Jet from Nozzle Set on Side Wall of Lance ISIJ International Vol.61(2021), No.6
  8. Hydrogen Effects on the Migration of Nanoscale Cavities in Iron ISIJ International Advance Publication
  9. Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid ISIJ International Vol.61(2021), No.6
  10. Thermal Stability of Molten Slag in Blast Furnace Hearth ISIJ International Advance Publication

Search Phrase Ranking

24 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. 34crmo4 pressure vessel
  4. high hole expansion ratio
  5. 34crmo4
  6. blast furnace permeability
  7. carburization
  8. characteristics of high speed steel/ductile cast iron composite roll manufactured by electroslag remelting cladding
  9. frp cylinder using cr−mo steel liner for storing high pressure hydrogen gas
  10. gas carburization