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. 78 (1999), No. 6

  • Scale-up of Advanced Low NOx and High Turndown Pulverized Coal Burner

    pp. 404-415

    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.78.404

    The specific low NOx burner, which is enabled to reduce both NOx and unburned carbon extremely and to perform the stable combustion at 20% load as like an oil burner, has been developed with a small size burner whose coal feed rate is 0.12 t/h in the previous study. To apply this burner to utility boilers, the influence of burner capacity on the combustion characteristics was investigated by comparison between the small burner (0.12 t/h) and a large burner (1.5 t/h) in this paper. The concept of this burner is follows. Coal particle is concentrated at outside of primary air nozzle by centrifugal force, and the coal concentration is controlled by a ring. At the exit of nozzle, the swirl of primary air is inhibited by straightener to reduce NOx efficiently.
    The swirl at the burner exit decreased with the increase of the straightener coefficient, which is a ratio of the gross area of the straightener to the cross section area of the primary pipe. When the straightener coefficient became greater than 1.2, the swirl was inhibited completely as same as 0.12 t/h burner. When the pulverized coal concentration control ring was placed close to the exit of nozzle, the local concentration of pulverized coal rose 1.7 times as high as the mean concentration in primary air. With this arrangement, the combustion flame kept stable at lower load and the minimum load of the burner was improved to 20% as like an oil burner. The unburned carbon in the fly ash was reduced very efficiently with a little increase of the NOx emission at lower load by controlling the coal concentration higher.
  • Properties and Residual Activities of Iron Based Catalyst after Direct Coal Liquefaction

    pp. 416-427

    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.78.416

    Liquefaction tests of Yallourn coal with iron based catalyst and elemental sulfur were carried out by using 0.1t/d BSU (Bench Scale Unit) to investigate the influence of the decrease in catalyst loading on oil yield. The properties of iron sulfide in CLB (Coal Liquid Bottom), recovered from the reactor after the coal liquefaction, were analyzed by powder X-ray Diffraction method with ldeg./min of scanning rate. It appeared that H2S concentration above lvol% in the gas phase was required to suppress the troilite (FeS) formation, keeping the pyrrhotite (Fe1-xS) on a smaller crystallite size. The liquefaction activities among the fresh and used catalyst (CLB-THFI) were strongly dependent on the crystallite size of pyrrhotite, indicating that the troilite was less active than pyrrhotite.
    γ-FeOOH catalyst had an excellent catalytic activity among the iron based catalysts due to the transformation into pyrrhotite with smaller crystallite size. It was concluded that the catalyst deactivation was suppressed by keeping the H2S concentration at lvol% in the gas phase, resulted in a successful reduction of γ-FeOOH catalyst loading down to 0.3 wt% daf as Fe through the bottom recycle in the BCL (Brown Coal Liquefaction) process.

Article Access Ranking

23 Sep. (Last 30 Days)

  1. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Vol.61(2021), No.9
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Preface to the Special Issue on “Recent Progress in Inclusion/ Precipitate Engineering” ISIJ International Vol.61(2021), No.9
  4. Evaluation of Interfacial Energy between Molten Fe and Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides ISIJ International Vol.61(2021), No.9
  5. Effect of Heating Rate on Carbothermic Reduction and Melting Behavior of Iron Ore-Coal Composite Pellets ISIJ International Advance Publication
  6. Analysis of Air-Mist Cooling Effect for Coil in the Electromagnetic Induction Controlled Automated Steel Teeming System ISIJ International Vol.61(2021), No.9
  7. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  8. Modeling of Wall Shear Stress Induced Inclusion Transport and Removal in Multi-Strand Tundish ISIJ International Vol.61(2021), No.9
  9. Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite ISIJ International Advance Publication
  10. Simultaneous Analysis of Soluble and Insoluble Oxygen Contents in Steel Specimens Using Inert Gas Fusion Infrared Absorptiometry ISIJ International Vol.61(2021), No.9

Search Phrase Ranking

23 Sep. (Last 30 Days)

  1. blast furnace
  2. inconel 600
  3. blast furnace productivity
  4. miyamoto goro
  5. b2o3 mold flux
  6. blue carbon
  7. investigation of arc behavior and temperature distribution corresponding to electrode and phase configurations in a multiphase ac arc
  8. ohno
  9. sei kimura
  10. skd61