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. 84 (2005), No. 5

  • The Structural Analysis of Rapid Preheated Coal Using ESR Spectroscopy

    pp. 426-430

    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.84.426

    Coal was heat-treated up to the softening temperature under the 2 types of heating conditions (10°C/min, 104°C/min). Spin concentration by high temperature Iusitu ESR, and the saturation behavior of the ESR spectrum were measured. Based on that result, effect of rapid preheating on coal molecular structure was examined.
    (1) Because the change in coal chemical structure by the cracking reaction is taking place, spin concen-tration of slow preheated coal is higher than that of rapidly preheated coal and raw coal. At 300°C or more, the spin concentration of rapidly preheated coal is same profile as raw coal. In the case of rapid preheating, it is indicated that the degree of coal structure change by cracking reaction is small.
    (2) The following results were obtained as the saturation power of ESR was measured. At 250°C or more, the saturation power of slow preheated coal declines as the temperature rises. One side, it confirmed that the saturation power of rapidly preheated coal became large at 370°C. The increase in saturation power indicates that the relaxation of coal structure progressed about coal molecular structure part that can be observed with ESR.
  • Trace Elements Behavior in Coal Gasification Based on Thermodynamics Equilibrium Calculation

    pp. 431-437

    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.84.431

    To understand behavior of trace elements in high temperature coal gasification accompanied with molten ash, the chemical compounds were estimated by thermodynamic equilibrium calculation. The calculation results were compared with the test results of a high temperature and pressurized coal gasification pilot plant with partial combustion. As for distribution of trace elements in slag discharged from pre-combustor, in the char separated by char collector and the product gas containing the fly ash, the estimated results for almost of non-volatile and some of volatile elements were corresponding to the test results well and those for semi-volatile elements as Mn, Cr, Pb, As and volatile elements as Hg and F were not well. The equilibrium calculation results of chemical compounds related to the semi-volatile elements suggested that the slagliquid phase exists together with solid phase in the char and the fly ash while the compounds in the molten slag discharged from the high-temperature gasifier over 1600°C were all slag-liquid phases. Furthermore, study on influence of operating condition on the chemical compounds suggested that increasing temperature of pre-combustor decreased the semi-volatile elements such as Pb in slag and increased it in char. Pressure increased it in slag and decreased it in other discharged. Gas cooling temperature strongly influenced the behavior, increased the semi-volatile elements in product gas and decreased it in slag and char.

Article Access Ranking

14 Jul. (Last 30 Days)

  1. Production and Technology of Iron and Steel in Japan during 2019 ISIJ International Vol.60(2020), No.6
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Numerical Simulation of Fluid Flow and Solidification in a Vertical Round Bloom Caster Using a Four-port SEN with Mold and Strand Electromagnetic Stirring ISIJ International Advance Publication
  4. Scheduling in Continuous Steelmaking Casting: A Systematic Review ISIJ International Vol.60(2020), No.6
  5. Numerical Simulation for the Influence of EMS Position on Fluid Flow and Inclusion Removal in a Slab Continuous Casting Mold ISIJ International Vol.60(2020), No.6
  6. From Iron Ore to Crude Steel: Mass Flows Associated with Lump, Pellet, Sinter and Scrap Iron Inputs ISIJ International Vol.60(2020), No.6
  7. Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography ISIJ International Vol.60(2020), No.6
  8. Experimental Evaluation of Texture Change during Grain Growth in Electrical Steel Sheets and Its Prediction by Phase Field Simulation Tetsu-to-Hagané Vol.106(2020), No.7
  9. Tension Leveling Using Finite Element Analysis with Different Constitutive Relations ISIJ International Vol.60(2020), No.6
  10. Deoxidation of Electroslag Remelting (ESR) – A Review ISIJ International Vol.60(2020), No.6

Search Phrase Ranking

14 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. cao sio2 viscosity
  5. 17-7 ph
  6. hole expansion ratio
  7. big data
  8. cao
  9. cold formed bainitic steel
  10. digitalization