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. 76 (1997), No. 2

  • Improvement of Alkali Soil by Gypsum and Fly Ash from Desulfurization Process of Coal Combustion Furnace

    Fukuya IINO, Masayoshi SADAKATA, Masanori AOKI, Yoshitaka NITTA, Satoshi MATSUMOTO

    pp. 119-124

    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.76.119

    Abstract

    Alkali soil harmfully affects the growth of most vegetation mainly due to its high pH caused by sodium carbonate. Calcium sulfate has been known as a chemical for improving this soil, because calcium ion dissolved from it substitutes sodium ion in the exchange site of the clay in the soil.
    The object of this research is to investigate an effect of desulfurization gypsum on the growth of wheat on the alkali soil. In the northern part of China, the soil is widely distributed and needed to be improved in order to increase the agricultural products. The use of desulfurization gypsum for the improvement of the alkali soil is paid attention for the possibility to promote the construction of desulfurization units.
    The experiment on the growth of the wheat was carried out on the soil imported from Shen Yang in China. It showed that 0.5 wt% of desulfurization gypsum provides a greater harvest than the case of the control. According to the benefit estimation with the ratio of 0.5 wt% CaSO4·2H2O, desulfurization units in Paotou in the Inner Mongolia will bring gypsum to 130 thousands of farmers in this area, if they are installed.

  • Modelling of Coal Pyrolysis on the Basis of Molecular Structure

    Kazuya GOTO, Akihiko INOMATA, Hideyuki AOKI, Takatoshi MIURA

    pp. 125-133

    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.76.125

    Abstract

    A new coal pyrolysis model based on FLASHCHAIN model is proposed to quantitatively estimate the amount of released tar and pyrolytic gases from different kind of coals. The FLASHCHAIN model derived from the molecular structure of coal has been proposed for the rapid pyrolysis by Niksa et al. and can consider the effect of the pyrolysis condition on the products yields. The new model parameters are determined from correlation equations of improved parallel first order reaction model previously proposed by Miura et al. and the ultimate analysis of coal. The simulated results are compared with our experiments on volatile matter and tar yield with various heating rate conditions (10 and 100 K/min) and coals (Witbank, Lusca and Warkworth) The new model can predict well both yields and consider the effect of molecular structure of coal on release rate of volatile matters. The model will be applied to the mathematical mnriellinv of earhnnizatinn nrneess in the irnnmakincr nrneess

  • A Preliminary Experiment of Volatilization of Minerals in Coal Ash by Chlorination Treatment

    Taihei SHIMADA, Takehiko KUMAGAI, Takashi TSURUE, Yoshinori NAKATA, Takeshi OKUTANI, Shohei TAKEDA, Jun-ichiro HAYASHI, Tadatoshi CHIBA

    pp. 134-144

    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.76.134

    Abstract

    Chlorination and volatilization characteristics of minerals in coal ashes were studied for chemical modification of the ash composition and properties. The ash samples were prepared by burning three bituminous coals, a lignite and a brown coal in a muffle furnace at 1088 K (high-temperature ash; HTA) and in an O2 plasma asher (low-temperature ash; LTA). On heating the ashes at 10 K/min to 1273 K in atmospheric chlorine gas flow in a thermobalance reactor, chlorination of minerals was found to take place even without oxygen sink and was followed by vaporization of the metal chlorides formed. Elemental analysis of the original and chlorine-treated HTAs revealed that most of K, Na, Mg and Fe and a portion of Ca were extracted while others such as Si and Al were hardly volatilized. Some pure metal oxides and a carbonate abundant in the ashes were treated at the same conditions. The result showed that Fe2O3 and Fe3O4 were rapidly volatilized in a temperature range of 900 to 1200 K. MgO was slowly but completely volatilized at 1273 K. Chlorination of CaO and CaCO3 occurred at much lower temperatures but vaporization of CaCl2 proceeded very slowly even at 1273 K. Changes in the ash weight with increasing temperature widely varied for the type of the initial ash. The variation was explained on the basis of the initial contents of metal oxides and carbonates. The chlorination treatment resulted in a significant reduction of differences in the mineral compositions, melting point temperatures and acid-base indices of residual solids from HTAs derived from the bituminous coals.

  • Effect of Heating Rate on Properties of Produced Char

    Hiroshi TAKAHASHI, Toshinori KOJIMA, Yasumasa YAMASHITA, Atsushi INABA

    pp. 145-149

    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.76.145

    Abstract

    The present paper describes the results of the THF-solubles accumulation phenomenon in chars. The chars obtained from two Japanese bituminous coals, Akabira and Miike coals, were pyrolyzed in a TG and a free fall reactor under a nitrogen stream at atmospheric pressure. The maximum temperature range and heating rates, respectively, were 300-600°C and 3 or 100°C /min in the TG, and were 363-682°C, up to 1.0 × 105°C /min calculated in the free fall reactor. The properties of chars produced by each apparatus were analyzed and compared at the same conversion by THF extraction, H/C ratio and FT-IR. For each coal, rapid pyrolysis (100 and 105°C /min heating rates) allowed the THF-solubles fraction (thought of as heavy primary products) to accumulate in the char as heating rate increased. The maximum yields of THF-solubles in chars also appeared at low conversions, 0.15-0.2 for Akabira coal and 0.08-0.13 for Miike coal. Variations in H/C and Har/Hal ratios were small in this region of low conversion. From these results, we can say that heavy primary products still remain in char particles without secondary reaction.

    Recommended Articles: Rapid Production of Metallurgical Coke by A Pressurized Hot-briquetting Method [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Rapid Production of Metallurgical Coke by A Pressurized Hot-briquetting Method Journal of the Japan Institute of Energy Vol.72(1993), No.9
    2. Reaction and Consumption Behavior of Unburnt Char in Lower Part of Blast Furnace Tetsu-to-Hagané Vol.87(2001), No.5
    3. Influence of Strength and Reactivity of Formed Coke on Reaction, Heat Transfer and Permeability in Lower Part of Blast Furnace Tetsu-to-Hagané Vol.83(1997), No.1
  • © 1997 The Japan Institute of Energy

Article Access Ranking

17 Apr. (Last 30 Days)

  1. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining ISIJ International Advance Publication
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Influence of Ore Assimilation and Pore Formation during Sintering on Reduction Behavior of Sintered Ores Tetsu-to-Hagané Vol.107(2021), No.3
  4. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  5. Numerical Simulation of Flow, Heat, Solidification, Solute Transfer and Electromagnetic Field for Vertical Mold and Curved Mold of Billet ISIJ International Vol.61(2021), No.3
  6. Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath ISIJ International Vol.61(2021), No.3
  7. Dissolution Behavior of Mg and Ca from Dolomite Refractory into Al-killed Molten Steel ISIJ International Advance Publication
  8. Effect of Rare Earth Ce on the Morphology and Distribution of Al2O3 Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process ISIJ International Vol.61(2021), No.3
  9. Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire ISIJ International Advance Publication
  10. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

17 Apr. (Last 30 Days)

  1. blast furnace
  2. coke oven gas injection
  3. tetsu-to-hagané
  4. blast furnace permeability
  5. blast furnace productivity
  6. slag
  7. ultrasonic inclusion
  8. continuous casting of electrical steel
  9. deoxygen in liquid iron
  10. electrical steel and continuous casting