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Volume 45, Issue 8
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1966 Volume 45 Issue 8 Pages 525-526
Published: August 20, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (392K) -
Masamoto Miyahara1966 Volume 45 Issue 8 Pages 527-542
Published: August 20, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe present tendency in coke-oven operation is to perform it more economically by mechanisation and automation with an idealistic final aim of “no man” operation.
For charging coke-ovens, the author suggests the possibility of the followin devices:
(a) A battery without a chimney, in which hot waste gas is drawn mechanically, and the waste heat is utilized for drying the coal to be charged.
(b) A large, expensive coal bunker is replaced by a small one (sufficient for about 3 ovens only). Instead, a large scale blending and storage stations are installed on ground. Conveying of blended coal to the elevated small bunker thus becomes continuous. During this operation, the coal is dried by the waste hot gas as described in (a), making the moisture content of the coal charge constant, say 5%.
The author predicts the tendency of large-size ovens, i. e. higher ovens, mainly for economical reason. In Japan, the highest at present is 6m, but still higher 6.5m ovens (both of Carl-Still system) are under construction.
Possibility of fabrication of coke-oven refractories with higher refractoriness and better heat conductivity than in the present silica bricks is envisaged.
Up-to-date improvements in mechanisation and automation regarding coke-oven machineries, such as charging-car, coke-pusher, reversing winch etc. are described, and it is urged to further improve various operations in the sense of prevention of air pollution and the comfort of operaters, although there are certain limitations. In order to achieve such improvements, it is stressed that intimate cooperation of the coke-oven engineers, viz, team work, is vital beside individual exertion.View full abstractDownload PDF (3552K) -
Committee for utilization of indigenous coal for t, Committee for ut ...1966 Volume 45 Issue 8 Pages 543-562
Published: August 20, 1966
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSBy the request of the Ministry of International Trade and Industry a committee was installed in the Japan Iron and Steel Association sponsored by the Coal Association, the Coal Mining Research Center and 9 iron and steel companies for studying the utilization of indigenous coals for the production of blast furnace coke. As one of its undertakings, a test of total charging of briquettes was carried out during April 1 to December 20, 1965 at the Kukioka Works of the Yawata Iron and Steel Co. The test plant costed ¥ 175 million, one half of which was subsidized by the government.
The press was imported from Germany, and had a capacity of 35t/hr at a pressure of 5t/cm2 with a roll 1, 405mm∅×440mm. The size of a briquette obtained was 56×47× 27mm. It was found that water content of 5-7.5% and pressure of 320-340kg/cm2 most suitable for briquetting.
At first, briquettes made from 21 kinds of blends composed of indigenous coals and some imported coking coal in various compositions were coked in a 1/4 ton test oven with a flue temperature of 1, 150-1, 200°C. The experimental cokes so obtained showed:
(a) Microstrength increased.
(b) Lumps became smaller.
(c) Input in oven increased by 20%.
(d) Saving of about 15% of imported coking coal was realized.
(e) It is possible to blend 5-10% indigenous noncaking coal.
Next, similar tests were carried out in regular coke ovens of No.1 Battery of Kukioka Works (flue temperature: 1.150-1, 180°C, coking time: 19 hrs). The results obtained were the same as those of the test oven.
It was, therefore, concluded that this method, at least, is technically successful in fulfilling the object of blending indigenous coal to a certain extent, but it still embodies many problems, especially economical, which have to be solved before it becomes a complete success.View full abstractDownload PDF (2889K) -
Susumu Yoshida, Haruzo Sato1966 Volume 45 Issue 8 Pages 563-574
Published: August 20, 1966
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSFrom 1962, we have done several tests by the Preheated Coal Carbonisation Process at our laboratory and middle scale plant, and commercial coke oven. We used charging coal which mixed with more much quantity of Japanese coals from the point of utilization of domestic coals.
Results of these tests, for example, were following,
Seam Normal Preheating
Strong coking coal (import) 52-56% 20-40%
Weakly coking coal (import) 4-6%
Weakly coking coal (Japanese) 38-44% 30-70 %
Non or slightly coking coal (Japanese)-0-20 %
And preheated coal cokes have very nice coke strengths that 15mm indexes of JIS drum test are more 93.
Productivity for coke oven increases about more 20%, and probably any troubles shall not be happened by introducing preheating process for full scale coke oven.
Now, we believe that the Preheated Coal Carbonisation Process shall be able to use practicaly for commercial coke oven in Japan.View full abstractDownload PDF (1679K) -
Yuji Yoshida, Junjiro Kumai, Kiyoshi Yamaguchi, Tutomu Kato, Katsutosh ...1966 Volume 45 Issue 8 Pages 575-584
Published: August 20, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe results obtained for the manufacture of formed coke by a pilot plant installed in the Institute were reported for the first time. The plant consists of (a) a heating furnace of fluidization bed heated both internally and externally (170kg/hr capacity), (b) a double-roller press (It/cm2 pressure, 100-400kg/hr capacity) and (c) a carboniser (100-200kg/hr capacity). A suitably blended material (100-80% non-caking coal with 0-20% strongly caking coal) was first heated at 450°C for 3 minutes in (a), and briquetted while still hot by (b), giving briquettes with a drum index of 60-65%. These briquettes were finally carbonised in (c). It was found that coke with sufficient strength for metallurgical use could be expected by this method.View full abstractDownload PDF (1302K) -
Takashi Miyazu1966 Volume 45 Issue 8 Pages 585-593
Published: August 20, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBy exhaustive tests carried out at 5 places in 3 undertakings, the following conclusions were drawn:
Total moisture: Disadvantageous to Japanese undertakings in 0.2-2%.
Ash: Some are agreeing, while others are incongruent due to difference of method and apparatus employed for analysis.
Volatile matter: Similar to the case of ash.
Total sulphur: Generally disadvantageous to Japanese side.
Swelling index and Calorific value: Tends to deteriorate due to weathering during transportation.
As for determination of ash, volatile matter and total sulphur, comparative study of JIS (Japan Industrial Standard), ASTM, BS and ISO was also performed.View full abstractDownload PDF (1096K)
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