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

07 May. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  3. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4
  4. Automatic Ultrasonic Testing of Non-metallic Inclusions Detectable with Size of Several Tens of Micrometers Using a Double Probe Technique along the Longitudinal Axis of a Small-diameter Bar ISIJ International Vol.61(2020), No.1
  5. Rapid Method to Measure Hydrogen Diffusion Coefficient in Metal Using a Multi-sine Wave Signal ISIJ International Vol.61(2021), No.4
  6. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining ISIJ International Advance Publication
  7. Review of Positron Lifetime Studies of Lattice Defects Formed during Tensile Deformation in a Hydrogen Environment ISIJ International Vol.61(2021), No.4
  8. Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel ISIJ International Vol.61(2021), No.4
  9. A Visualization Method of Quantifying Carbon Combustion Energy in the Sintering Packed Bed ISIJ International Advance Publication
  10. Effects of Stress and Plastic Strain on Hydrogen Embrittlement Fracture of a U-bent Martensitic Steel Sheet ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

07 May. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. coke oven gas injection
  4. ultrasonic inclusion
  5. blast furnace productivity
  6. continuous casting of electrical steel
  7. slag
  8. activities in the liquid solution sio2-cao- mgo-al2o3 at 1600℃
  9. activity coefficient of ti in liquid iron
  10. cokes gasification