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Volume 55, Issue 11
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[in Japanese]1976 Volume 55 Issue 11 Pages 873-874
Published: November 20, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (498K) -
Utaji Koyama1976 Volume 55 Issue 11 Pages 875-891
Published: November 20, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe purpose of this paper is to review recent developments of combustion technology relevant to design and operation of furnace and combustor, specially for reducing NOx formation and enegy saving.
Another purpose of this paper is to show the activity of IFRF (International Flame Recearch Foundation).View full abstractDownload PDF (2791K) -
Ken-ichi Yanagi1976 Volume 55 Issue 11 Pages 892-898
Published: November 20, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe water spray cooling of hot steel is applied to many processes at the iron works, such as cooling of cast iron at a continuous casting machine and cooling of steel plate and rollers in mills.
The mechanism of the heat transfer from the steel plate to Spray droplets has not made clear completely because of complicated boiling phenomena attended with ydrodynamic movement of droplets. But, actually, this method is used at many process on the ground of simplicity of cooling apparatus and being able to get large cooling speed.
In this lecture, some illustrations of spray cooling applications are introduced, and the basic mechanisms of the heat transfer are explained qualitatively refering to the research works and the cooling curve of fog cooling. And the tests for spray and fog cooling, these were accomplished at our laboratory, are briefly mentioned.View full abstractDownload PDF (1065K) -
Selection of Sulfonation Reagents and Optimum Condition for Sulfonation of AsphaltKazuyoshi Kudo, Kiyoshi Terada, Akira Yokogawa, Mitsuyuki Mitooka, Yoj ...1976 Volume 55 Issue 11 Pages 899-906
Published: November 20, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThis paper describes the selection of sulfonation reagents and the optimum condition for sulfonation of asphalt.
The influence of the content of SO3, which was contained in sulfonation reagents, on the yield of char was investigated with the increasing rate of yield of char per unit weight of SO3.
It was recognized that the yield of char increased gradually with the content of SO3 and reached the maximum value at about 60-80wt.% SO3.
It was found that the utilization of 60wt.%-oleum was more effective for sulfona-tion after general consideration of the yield of char, its shapes, its hardness, freezing point of sulfonation reagents etc. Futhermore, the optimum condition to produce non-caking char by 60wt.%-oieum became evident after the detailed consideration of various conditions for sulfonation of asphalt which influenced on the yield of char or activated carbon.View full abstractDownload PDF (1235K) -
Carbonization of BriquetsShohei Takeda, Hiroshi Nishino, Midori Yumiyama, Toshimasa Hirama, Yuj ...1976 Volume 55 Issue 11 Pages 907-917
Published: November 20, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe authors carried out basic investigation to develop a new process for making metallurgical formed coke from a mixture of non-coking coal and coking one.
In the present paper the results of experiments using laboratory scale apparatus and a pilot plant were discribed.View full abstractDownload PDF (2089K) -
On a Horizontal Continuous Type Fluidized Sand Bed CarbonizerMidori Yumiyama, Toshimasa Hirama, Shohei Takeda, Hiroshi Nishino, Aki ...1976 Volume 55 Issue 11 Pages 918-927
Published: November 20, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSManufacturing test of metallurgical formed coke were carried out using horizontal continuous fluidized sand bed carbonizer. In the horizontal fluidized bed given temperature distribution were set and the formed cokes were continuously made by allowing the briquets to flow through the fluidized bed.
Prior to the pilot plant test, basic investigations to determine the fluidizing conditions of large particles such as briquets were carried out and the characteristics of a horizontal continuous fluidized bed were also studied using laboratory scale apparatus. As a results it was shown that even in the case of large particles such as briquets, fluidization of briquets is possible if an appropriate density of the fluidized particles is used as the medium. Further, the lateral thermal diffusivity of the fluidized bed is approximately 1/10 of that of the vertical direction, and by inserting suspended pack-ings into the bed, it was ascertained that the lateral thermal diffusivity could be still further minimized. Therefore, it was clearly shown that the horizontal continuous fluidized sand bed carbonizer is an advantageous apparatus for having a temperature distribution in a lateral direction.
Based on the above preliminary findings a pilot plant scale pre-heater and car-bonizer were designed and built. Of these the Peclet number obtained from flow characteristics tests at room temperature using the carbonizer, within the range of the present experiments was 3-50, and if an appropriate selection of operational conditions are made, irregularities of the formed coke properties can be minimized.
Owing to limitations of the carbonizer, carbonizing tests at over 900t were not conducted, but it was ascertained that continuous operations are possible and at the same time the weight loss of briquets during carbonization was investigated.View full abstractDownload PDF (1558K) -
Hiromi Ozaki, Mamoru Yamane1976 Volume 55 Issue 11 Pages 928-939
Published: November 20, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAs environmental regulations to prevent sulfur oxide emissions will become stricter in the future, it will be necessary to effectively crack residual oils of high sulfur contents by-produced in refineries.
On the other hand, it is conceivable that thesteel industry in Japan will, in the near future, suffer from shortages of coking coals for producing blast furnace cokes. Accordingly, petroleum green cokes produced by coking of petroleum residualoils are now used for producing blast furnace cokes in many steel mills. However, such conventional green cokes have neither coking properties nor fluidity. So those cokes are used merely as a carbon source of low ash content.
Therefore, it is considered very urgent and significant, from the viewpoints of petroleumrefining as well as steel manufacturing, to produce synthetic coking coals from residual oils.
For the purpose asdescribed above, authors have made studies to produce synthetic coking coals having good coking properties and fluidity from residual oils and to produce thermal-cracked oils which can be easily hydrodesulfurized.
Based on the basic studies, a research using a pilot plant is now in progress for the purpose of constructing commercial plants.
In the present paper, the results obtained pythose basic studies concerning the production of synthetic coking coals from petroleum residual oils have been reviewed.View full abstractDownload PDF (2020K)
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