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

    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

    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

    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

    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

    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

    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.

Article Access Ranking

11 Dec. (Last 30 Days)

  1. Coating Film Profiles Generated by Fluctuating Location of the Wiping Pressure and Shear Stress ISIJ International Advance Publication
  2. Numerical Simulation of Decarburization Kinetics for Fe-3%Si Steel during Annealing ISIJ International Advance Publication
  3. Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding ISIJ International Advance Publication
  4. Effects of Coke Ash on Erosion of Carbon Composite Brick ISIJ International Advance Publication
  5. Mechanical Property of Ultrafine Elongated Grain Structure Steel Processed by Warm Tempforming and Its Application to Ultra-High-Strength Bolt Tetsu-to-Hagané Advance Publication
  6. Influence of Agitating Conditions on Agglomeration and Collapse of Iron Ore Mixture ISIJ International Vol.58(2018), No.11
  7. Change in Composition of Inclusions through the Reaction between Al-killed Steel and the Slag of CaO and MgO Saturation ISIJ International Advance Publication
  8. A Review of Fluorine-free Mold Flux Development ISIJ International Vol.58(2018), No.11
  9. Effect of Manganese on the Thermodynamic Property of Tellurium in Molten Iron ISIJ International Vol.58(2018), No.11
  10. Image-based Method for Measuring Pellet Size Distribution in the Stable Area of Disc Pelletizer ISIJ International Vol.58(2018), No.11

Search Phrase Ranking

11 Dec. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. 鉄と鋼
  4. blast furnace productivity
  5. depression in continuous casting of billet
  6. stainless steel
  7. automation in steel industry
  8. hot forming
  9. coil break
  10. cr(vi)