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Volume 47, Issue 8
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[in Japanese]1968 Volume 47 Issue 8 Pages 605-606
Published: August 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1597K) -
T. Fukuyama, T. Miyazu, Y. Okuyama, H. Kimura, M. Shiraishi1968 Volume 47 Issue 8 Pages 607-615
Published: August 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis study is of great importance to clarify the thermal behaviours of cokes in blast furnace or electric furnace.
Studies on the changes of the physical and chemical properties by heat-treatment were carried out for heat-treated cokes at various high temperatures (1, 200-2, 000°C). The coke sample packed in a carbon box was heat-treated with a heating rate of 10°C/ min. up to 1, 350°C, 5°C/min. in the range 1, 350°C-2, 000°C in a vacuum carbon re-sistance furnace (40kW) and then held for 20min. at the desired top temperature.
The characteristics of cokes are listed in Table 3. As the results of research, the following informations were obtained.
(1) The reactivity of coke (Fig.6) shows minimum at the temperature range 1, 350-1, 500°C, but it rises again with increase of heat-treatment temperature (1.700°C or above). The reactivity index of coke heat-treated at 2, 000°C shows sometimes higher value than that of original coke. It is supposed that the catalytic action of metalytic iron reduced during heat-treatment of coke (Fig.7, 8) causes such higher reactivity.
(2) The micro-strength index (Fig.9) and the thickness of crystallites along the c-axis, Lc (Fig.10) increase with the ascent of heat-treatment temperature, and the both of them show similar behavior. There is significant correlation, therefore, between them.
(3) The contents of most element of mineral matter in coke, especially Fe, Mg and P (Fig.14, 15), decrease with the ascent of heat-treatment temperature, but the contents of Si and Al (Fig.13) decrease slightly.View full abstractDownload PDF (1949K) -
Takashi Miyazu, Tadashi Endo, Hiroshi Haramoto1968 Volume 47 Issue 8 Pages 616-624
Published: August 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFree Swelling Test of coal and Fusibility Test of coal ash were studied for revision of JIS M8801 and K2151.
As a result of the research, the following informations were obtained,
1) Free Swelling Test of Coal
a) It is desirable that the weight of each crucible is similar as possible.
b) It should be use the burner of same type, especially same diameter, since the index is differed by the change of it.(dmax≤1).
c) It is desirable to determine the index from the relationship of the areas of the standard profiles to swelling indexes, when the shape of button is irregular or the index exceeds 9.
2) Fusibility Test of Coal and Coke Ash
a) The bias of the ash fusion temperature between JIS M8801-1963 and ASTM D1857-64T is rather large (ca. 49 deg.).
b) Effects of ash preparation, cone size, heating rate were all significant. They are main cause of the bias of ash fusion temperature between JIS and ASTM.
c) There is no trouble to employ the Reducing Atmosphere Test in revisingw JIS.View full abstractDownload PDF (789K) -
Coal Briquetting Comitee, The Iron and Steel Insti1968 Volume 47 Issue 8 Pages 625-634
Published: August 20, 1968
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSIt is well recognized that the bulk density of coal charge in coke oven is affected by its size and moisture. The degree of such influence on the lower-moistured coal charge (particularly below 5%) has not so far been determined in the pilot coke oven similar to commercial coke oven plant.
The Japan Iron and Steel Institute erected equipments for the process that makes, the total coal charge to the briquette, in 1964, with the subsidy appropriated in the same year for the purpose of promoting coal treatment technique. As one of these apparatus was installed to determine the bulk density of coal charged. The Institute, this time, tried to study about the influence of the moisture and size of coal charge on the bulk density, using the large scale apparatus. The test result shows a tendency, approximately similar to those already comfirmed by the laboratory test, with couple of exceptions of rather unexpected results.
In handling of dry coal various phenomena, which required our special atten-tion, were observed. The moisture limit of non-dust-generating coal charge is properly regarded as around 6%.View full abstractDownload PDF (2671K) -
Chuei Chiba1968 Volume 47 Issue 8 Pages 635-642
Published: August 20, 1968
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSThe Nagoya Works was first opened as a works of the Tokai Iron and Steel Co. Ltd. capitalized by the Fuji Iron and Steel Co. Ltd. in collaboration with local business interests as a nucleus of heavy chemical industries in the Chubu (Nagoya) district. It was later taken over by the Fuji Iron and Steel and Co. Ltd.
The production capacity was first planned as 12, 500 tons of pig per day, and 5 million tons of crude steel per year, but now it is aimed at 7 million tons of crude steel per year.
As for the coke-ovens, it was decided to adopt 5 meter high Didier “flow-controlled” oven from technical as well as economical point of view. The first battery was put into regular operation on August 20, 1964, and No.2 battery, consisting of 110 ovens, was added last year.
At present, both batteries are working with a very high rate of productivityView full abstractDownload PDF (1216K) -
Shintaro Matsuzawa, Shojiro Ito, Hirokazu Nakao1968 Volume 47 Issue 8 Pages 643-651
Published: August 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSNo.1 coke oven battery at the Mizushima Works was erected for thepurpose of supplying the coke to No.1 blast furnace at the Mizushima Works of Kawasaki Steel Co. Ltd. The battery is of Carl Still type and consists of two batteries, IA and IB, each 39 ovens.
The major oven dimensions are as following.
Height of chamber, 6, 550mm
Length of chamber, 15, 900mm
Width of chamber, 420mm
Distance between oven centers, 1, 375mm
The total weight of brick used in lining the 39 ovens amounts to some 12, 000 tons, or 310 tons per oven.
Heating-up of IA battery was begun from 10th January, 1967, using the Buthane-Air gas (about 5, 000kcal/Nm3) as the fuel for heating-up.The temperature of ovens was determined by measuring temperatures at two spots in each flue, 2, 600mm below the oven top and taking their average. On the 57th day after the start of heating-up at the temperature of 750°C, it was reversed to regular heating and went into operation on the 18th March, 1967.
Heat quantityper brick ton was 513 x 103 kcal/t. The expected values and actual values of expansionof the ovens are in a good agreement. About three weeks after the start of the operation, IA battery was put to a guarantee test when heated with coke oven gas, and the satisfactory results were obtained in each items of the test.
Now it is operated with the constant operating ratio of 156‰.View full abstractDownload PDF (1125K)
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