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Volume 52, Issue 9
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[in Japanese]1973 Volume 52 Issue 9 Pages 707-708
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1334K) -
Delayed Coker-Calciner ProcessTakashi Yoshida, Shichiro Haseba, Yoshio Suetsugu, Harunori Miyazaki, ...1973 Volume 52 Issue 9 Pages 709-714
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSNittetsu Chemical considered the use of coal tar soft pitch as raw material for coke production because of relatively abundant supply, relatively low cost, and the need for coke in Japan. Although pitch coke has been produced commercially coking at high temperature in coke ovens, Nittetsu was looking for a quicker and economical process to produce pitch coke. The expansion of alminum industry greatly increases the demand for coke especially coke with low sulfur, ash, and metal contents.
Thus the world's first coking plant using coal tar sofe pitch was built in Tobata, Kita-Kyushu city, Japan. Delayed coking plant was designed to produce 75000 metric tons per year of green coke and calcining plant was designed to produce 60000 metric tons per year of calcined pitch coke.
The basic design and engineering of Delayed Coking Plant was prepared by The Lummus Company in United States. The detailed engineering and construction of the plant were carried out by Toyo Engineering Corporation. The basic design and engine-ering of Calcining Plant was prepared by Petrocarb Incorporated in the United States.
The detailed engineering and construction of the plant were carried out by Nissho-Iwai Co., Ltd.(Iwai & Co., Ltd. before merger) and Ishikawajima-Harima Heavy Industries Co., Ldt.
Nittetsu Plant has been in continuous good operation from start up (August 26. 1968) except for the scheduled shut-down.
The quality ofpitch coke by a new process is higher than petroleum coke and is now used for electrodes and anodes in the aluminum industry in Japan.View full abstractDownload PDF (762K) -
Shigeo Sugeta1973 Volume 52 Issue 9 Pages 715-720
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSI have been to U. S. S. R. for observing the coke dry quenching plants on 1971 and '72. Its reliability, the outline of the plant, the operating conditions and the quality of the dry quenched coke are to be reported here.
It is the process that cooling gas is circulated in a closed circuit by a smoke fan, between a quenching chamber and a waste heat boiler. The capacity of a quenching chamber is 56 T/H and generated steam is 0.43 to 0.45 T/T coke, at 40 kg/cm2, and 440°C.
Many plants have been in, operation and under construction, and especially at cherepovets iron and steel works, 5 units, each capacity 56 T/H, have been worked without any wet quenching station for new No.7 and 8 coke oven batteries.
From these facts, I can appraise that its engineering and operating technique have been established.
In regard to the quality of dry quenched coke, it is better than that of wet one, especially in strength and no moisture. Therefore it could bring better results for blast furnaces with using dry quenched coke.
From the point of air pollution in quenching coke, this plant is one of the most promiment one, now existing in the world.
The points to be improved furthermore, will be the dust arrestment device during charging hot coke in the chamber and establishing the engineering to various capacity of one unit.View full abstractDownload PDF (677K) -
Tatsuo Fukuyama, Takashi Miyazu, Yukio Terada1973 Volume 52 Issue 9 Pages 721-730
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe petrographic studies on coal are carried out by many Japanese steel mills for the following purposes:
1) Estimation of the coking property using a small amount of drilling core sample at coal.
2) Rapid checking of the quality of a shipment of coal.
3) Application as an auxiliary method in various studies.
It is of course desirable to use this technique for the routine operational control of coke plants, but the insufficiency of the reliability of it disturbs the actual application.
The authors, therefore, has studied on the following items to examine the repeat-ability within same laboratory and reproducibility between different laboratories.
a) Effects of the wave length of the filter and that of magnification of lens combination.
b) Statistical analyses for the results of the interlaboratory experiment held by the Japan National Committee for ISO/TC 27.
c) Statistical analyses for the results of the interlaboratory experiment held by the International Committee for Coal Petrology.
d) Theoretical considerations on the nos. of sample particle used for the petro-graphic analysis.
Informations obtained from the above studies are as follows:
1) Mean max. reflectance
i) The wave length of 525 nm results significant higher value (0.05-0.08) than that of 546 nm.
ii) The magnification of 600 x results higher value (about 0.04) than that of 250 x.
iii) Tolerances (Pr. 95%) calculated form the interlaboratory experiment are as follows:
within same lab.………0.03-0.04
Between diff. lab.……0.07-0.15
2) Maceral analysis
i) Precisions of maceral analysis are generally insufficient except Vt-group.The coefficients of variation (σ/x×100) for Ex.-group and In.-group frequently reaches 20-100%.
ii) One of the reason of these unpreciseness is considered as the less nos. of the sample particle tested.View full abstractDownload PDF (945K) -
Yasuhiro Yamada, Hidemasa Honda1973 Volume 52 Issue 9 Pages 731-738
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe chemical composition of binder pitches was examined by gas chromatography. Five kinds of pitches were used, that is, coar-tra straight pitch, three kinds of reformed binder pitches and naphtha-tar pitch.
The volatile components were determined by programmed temperature gas chrom-atography. The column of 5% SE-30 (silicon gum) coated chromosorb W was employed over the temperature range 200-260°C at the heating rate of 4°C/min. From the results obtained, it is considered that there is a relation between total amounts of volatile components and softening point of the pitch, and pitch containing large amounts of lower boiling components such as naphthalene shows low softening point.
Benzene insolubles in the pitch was examined by pyrolysis gas chromatography at temperature range 500-600°C. The components obtained were analyzed under the condition that the column of 5% SE-30 coated chromosob W was employed over the temperature range 100-260°C at the heating rate of 6°C/min. At the range of the above pyrolytic temperature, the components decomposed easily were those of composition which consist of the components bonded CH2 group.
The components decomposed were classified four group, that is, 1) Ring number of polycondenced aromatic was 1 (benzene and its derivatives), 2) Ring number was 2 such as naphthalene, 3) Ring number was 3 such as anthracene and 4) Ring number was 4 or larger such as pyrene.
The components decomposed at pyrolytic temperature 600°C were formed in larger quantities from benzene insolubles of naphtha-tar pitch comparing with those of coal-tar pitches. Main components obtained from benzene insolubles of naphtha-tar pitch were group 1 and 2, those from coal-tar pitches were 4. In the case of straight coal-tar pitch, however, the components of group 2 were formed in larger quantities comparing with those of reformed coal-tar pitches.View full abstractDownload PDF (1012K) -
1973 Volume 52 Issue 9 Pages 745-753
Published: September 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1242K)
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