Steel Science Portal

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. 73 (1994), No. 8

  • Desulfurization Capacity of Iron Oxide Minerals for High Temperature Removal of H2S and its Relation to Their Physical Properties

    Satoshi KUSHIYAMA, Yutaka KOINUMA, Satoru KOBAYASHI, Reiji AIZAWA, Koichi MIZUNO

    pp. 737-747

    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.73.737

    Abstract

    SYNOPSIS: - H2S desulfurization capacity was compared between the sorbents of 0.59/0.84 mm particle size prepared from iron oxide minerals, i. e. ochers, red clays and iron ores. Reactions were carried out using a packed-bed microreactor with a 0.5 % H2S-20 % H2-N2 gas mixture at the condition of; temperature 500°C, GHSV 10, 000 h-1, pressure 1.4 kgf/cm2. Among the sorbents tested, ochers showed remarkably high capacity. Observations of sulfided sorbent particles by secondary electron microscopy (SEM) together with the measurements of surface area, Fe2O3 crystallite size and pore size distribution led to the conclusions as in the followings;
    1) Under the reaction condition utilized, the capacity is strongly controlled by intraparticle diffusion. Only a little influence was observed of the surface area and/or the Fe2O3 crystallite size.
    2) Pore size distribution is an important factor governing the capacity, namely, the larger the macropore volume, the higher the capacity. However, it is the most critical whether or not the dense layer of pyrrhotite is formed on the outer surface of sorbent particles in the course of desulfurization.
    3) Examination by SEM revealed that no such dense layer was formed for the sorbents prepared from ochers, while it was clearly seen for the other sorbents. This is very likely the reason of the markedly high performance exhibited by ochers.

  • Properties of Carbon Containing in Fly Ash Discharged from Pulverized Coal Combustion Boiler

    Yong CHEN, Shigekatsu MORI

    pp. 748-752

    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.73.748

    Abstract

    Fly ashes E and G those discharged from a same pulverized coal combustion boiler were classified into two components, such as smaller fly ash particle under 38, a m and larger fly ash particle above 125 μm. The carbon cotained in both components were separated from fly ash by using the Ultrasonic Oil Agglomeration method. Properties of separated carbons were investigated by applying the X-ray diffraction, SEM (Scanning Electron Microscope), EDX (Energy Dispersive X-Ray Micro Analyzer) and TGA (Thermogravimetric Analysis). Following results are obtained.
    (1) The carbon remains in the larger fly ash as the unburned char, and that cotained in smaller fly ash are carbon black and rock carbon.
    (2) Significant differences of the carbon contents and their properties between the fly ashes E and G are found. The carbon content in smaller components of fly ash G is fairly greater than that in smaller components of fly ash E, although the coal G shows a good combustibility.
    These observations of the properties of carbon containing in fly ash present significant informations on the for rational operation and control in the process of pulverized coal combustion process.

  • Liquefaction of Solvent Swollen Coal by Supercritical Fluid Extraction Under Pyrolysis Conditions

    Tsuyoshi SAKAKI, Masao SHIBATA, Hideharu HIROSUE

    pp. 753-758

    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.73.753

    Abstract

    In order to increase the extract yield of coal and decrease the loss of extraction solvent due to the condensation between the solvent molecules, Wandoan, Wabamun and Illinois No.6 coals were kneaded with a half amount of solvent such as tetralin prior to supercritical extraction of coal. The solvent added coals were swollen during preheating process, and then extracted with a supercritical solvent such as toluene under pyrolysis condition. As a result, the extract yield of Wandoan coal was remarkably increased and the condensation of toluene was suppressed. Wandoan coal swollen with a hydrogen-donor solvent including nitrogen, such as tetrahydroquinoline and piperidine, gave a high extract yield over 88 wt% during extraction with supercritical toluene. However, these solvents were also taken into the residue in fairly mass. The extract yield was further increased by raising the extraction temperature above 653 K which was the temperature giving the maximum extract yield in the usual supercritical extraction without swelling. The effect of solvent addition was more significant for a coal having a higher solvent swelling property, in the order of Wabamun < Wandoan<Illinois.
  • © 1994 The Japan Institute of Energy

Article Access Ranking

05 Oct. (Last 30 Days)

  1. Interaction Coefficients of Cu and Sn with Mn in Molten Iron at 1873 K ISIJ International Advance Publication
  2. Deformation of Non-metallic Inclusions in Steel during Rolling Process: A Review ISIJ International Advance Publication
  3. Thickness classifier on steel in heavy melting scrap by deep-learning-based image analysis ISIJ International Advance Publication
  4. Bandwidth Maximization of Disturbance Observer Based on Experimental Frequency Response Data SICE Journal of Control, Measurement, and System Integration Vol.13(2020), No.6
  5. Soft sensors and Diagnostic Models Using Real Time Data of Blast Furnaces at Tata Steel ISIJ International Advance Publication
  6. Effect of SiO2 content and mass ratio of CaO to Al2O3 on the viscosity and structure of CaO-Al2O3-B2O3-SiO2 slags ISIJ International Advance Publication
  7. Non-Cooperative Optimization Algorithm of Charging Scheduling for Electric Vehicle SICE Journal of Control, Measurement, and System Integration Vol.13(2020), No.6
  8. Thermodynamic Conditions of MgO and MgO·Al2O3 Formation and Variation of Inclusions Formed in Fe-17 mass%Cr Steel at 1873 K Tetsu-to-Hagané Vol.108(2022), No.8
  9. Effect of 2CaO·SiO2 Addition on Reaction Behavior of Iron Ore Sinters ISIJ International Vol.62(2022), No.9
  10. Comparison of Oxidation Behavior of Various Reactive Elements in Alloys during Electroslag Remelting (ESR) Process: An Overview ISIJ International Vol.62(2022), No.8

Search Phrase Ranking

05 Oct. (Last 30 Days)

  1. blast furnace
  2. 鉄と鋼
  3. si-killed spring steel
  4. steel
  5. hydrogen trapping
  6. isij international
  7. damping alloy
  8. matsumura
  9. process
  10. scrap