Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
Volume 80 , Issue 9
Showing 1-4 articles out of 4 articles from the selected issue
  • The Estimation by IR Spectrum
    Shigeki FURUKAWA, Masaki OKADA, Satoshi HARADA, Yohichi SUZUKI
    2001 Volume 80 Issue 9 Pages 835-842
    Published: September 20, 2001
    Released: June 28, 2010
    In aqueous solution, Nakayama coal reacts easily with chromic anhydride (CrO3). In comparison with the raw coal, the 1, 100-1, 300cm-1 IR band of CrO3 pretreated coal is remarkably diminished. The intensity change arises from the interaction with chromic anhydride and hydroxyl groups in the coal. The magnitude of the decrease correlates well with the amount of reacted chromic anhydride. From a comparison of the IR spectra of products obtained from the reaction of several model compounds with chromic anhydride, the behavior of 1, 100-1, 300cm-1 IR band was assigned to a change in the C-O stretching vibration in the phenolic hydroxyl groups present in the coal. The method may be applicable as a general method for the determination of phenolic hydroxy groups in coals.
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  • An Evaluation of Regional Electricity Supply Potentials by ROSE Model
    Hiroshi YAGITA, Yutaka GENCHI, Yasuhiko KONDO, Masayuki SAGISAKA, Atsu ...
    2001 Volume 80 Issue 9 Pages 843-853
    Published: September 20, 2001
    Released: June 28, 2010
    We developed an optimization-type energy model named ROSE (Refuse Option for Supplying Energy) to evaluate the energy-use technologies of the refuse in the city. ROSE is applied to the 23 wards in Tokyo. We evaluate the future potentials of the conventional refuse power generation, the large-scale refuse power generation and the RDF power generation from the views of cost and CO2 emission reduction.
    Without increasing system cost, CO2 emission can be reduced by refuse energy systems (refuse power generation, RDF power generation). When the large-scale refuse power generation system was assumed to be available, the system cost could be reduced largely. RDF power generation was introduced in case of the CO2 emission was limited.
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  • Masato KOUZU, Takashi HAYASHI, Masatoshi KOBAYASHI, Yoshikazu SUGIMOTO
    2001 Volume 80 Issue 9 Pages 854-863
    Published: September 20, 2001
    Released: June 28, 2010
    Polar fractions in recycle solvent used in a 150t/d NEDOL coal liquefaction pilot plant were divided into acidic, basic, and neutral polar fractions by extraction with NaOH and H2SO4 solutions. These fractions were analyzed by GCFID and GCMS to identify the chemical structure.
    The acidic fraction was mainly composed of phenols and indanols. Since the basic and neutral-polar fractions contained a large number of hydrogenated and alkylated homologues of polar aromatics, pyrolyzer-GC (Py-GC) system was useful in examining aromatic skeleton of these fractions. Nitrogen compounds in the basic fraction (1.7-5.5wt%) were pyridine type with 2-4 aromatic rings, and those in the neutral-polar fraction (3.3-5.9wt%) were pyrrole type with 2-4 aromatic rings. Most of the phenolic compounds in the neutral-polar fraction were with 3-4 aromatic rings, and the recycle solvent included 11.5-17.4wt% phenolic compounds in total.
    The content of the nitrogen compounds in the recycle solvent increased with an increase in nitrogen content of raw coal. The basic pyridine type markedly increased, compared with the neutral pyrrole type. The degree of deactivation of catalyst for solvent hydrotreatment was not influenced by the content of the basic nitrogen compounds.
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  • Shunichi YANAI, Toshiaki OKUI, Katsunori SHIMASAKI, Osamu OKUMA, Sator ...
    2001 Volume 80 Issue 9 Pages 864-870
    Published: September 20, 2001
    Released: February 23, 2011
    Coal liquefaction reactors are operated in high-temperature and high-pressure conditions, and the pulverized coal is fed to the reactor after making slurry using recycle solvent with wide boiling point range. Therefore, vapor-liquid distribution of solvent fraction in the reactors is one of the key issues to evaluate kinetic rate and reaction performance because it directly affects the actual residence time of the liquid phase in the reactors.
    Using continuous coal liquefaction facility, which has systems for sampling the liquid phase in the reactor, 94 runs were conducted. The liquid samples from the reactors as well as the product liquids were collected and analyzed. The ratio of vaporized solvent fraction to total solvent fraction (Rv (Solv)) was calculated using these data. Rv (Solv) strongly depended on the reaction conditions, and was changed from 25wt% to 95wt%. Mainly, Rv (Solv) was affected by temperature, pressure, gas flow rate through the reactor. It also depended on boiling point distribution and properties of the solvent.
    Vapor-liquid equilibrium calculation using SRK method was developed, and its results agreed well with Rv (Solv) obtained by the experiments. These results show that the vapor-liquid equilibrium calculation is useful for analyzing the reaction dynamics and designing coal liquefaction reactors.
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