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Volume 48, Issue 10
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[in Japanese]1969 Volume 48 Issue 10 Pages 731
Published: October 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (279K) -
Yoshiteru Jamoto, Hiroshi Matsuoka, Susumu Ota1969 Volume 48 Issue 10 Pages 732-737
Published: October 20, 1969
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe carbon adhered to the coke oven wall can be classified into “primary” and “secondary” ones, the former being laminar parallel to the wall, and the latter granuler with less content of ash.
By employing a test oven with 8kg coal charge, the factors that influence rate of carbon growth were studied.
Rate of growth is influenced by the temperature of adhesion surface, coal volatile matter and moisture, and expressed by following formula.
D (mm/day) =64.5e-7.95×103/T (°K) ·VM (%) [1-0.0476W (%)]
Where D, T, VM and W denote rate of growth, temperature of adhesion surface, volatile matter and moisture respectively.
By using this formula, at the space temperature of 800°C for a charge with 30% volatile matter and 10% moisture, the rate of growth was found to be 0.6mm per day, which is nearly much of result by notych and value observed usually at coke oven.View full abstractDownload PDF (1033K) -
Yuji Yoshida, Junjiro Kumai, Kiyoshi Yamaguchi, Yuzo Toda, Minoru Shir ...1969 Volume 48 Issue 10 Pages 738-745
Published: October 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBased on the fundamental studies and the operation results of the pilot plant reported previously, another pilot plant was installed to make formed coke of larger size. Caking coal and non-caking coal are separately pre-heated in two contnuous fluidized bed retorts. The heating temperature of caking coal is lower than that of non-caking coal to prevent agglomerating or sticking in the retort. These temperatures are selected according to the mixing rate and plastic properties of coals used so that the adequate temperature for hot briquetting may be obtained after mixing in a paddle mixer. An oil press of rotary table type is used to make briquettes of 70 mm in height and diameter.
A set of carbonizer consists of a pre-carbonizer using hot sand as a heat carrier and a high temperature carbonizer heated internally by hot combustion gas.
According to the results obtained by a laboratory test apparatus, non caking coal must not be heated over 600°C, because it becomes innert char, which gives finally abrasive formed coke, even if caking coal is added. It is desirable to pre-carbonize a briquette to prevent it from fissuring due to heat shock.View full abstractDownload PDF (1350K) -
Results of Interlaboratory ExperimentTechnical Committee for Testing of Coal and Coke1969 Volume 48 Issue 10 Pages 746-753
Published: October 20, 1969
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSIt is the purpose of this paper to discuss the problems of analytical technics in relation to the difference between JIS M8801 and ISO R501.
Subjects included are as follows:
1. Difference in gas heating method and electrical heating method (ISO R501).
1.1 Comparison of mean values of two methods.
1.2 Comparison of precisions of two methods.
2. Effect of difference in weight of crucibles.
3. Tolerances (maximum acceptable difference of the serial test) of two methods.
4. Adoption of caribration curve for the determination of F.S. I.
It is concluded that, (1) the differences in mean values and precisions of two methods are not significant, (2) there is no difficulty for employing the electrical heating method in revised JIS M8801 and (3) the effect of difference in weights of crucibles is negligible small.View full abstractDownload PDF (996K) -
Shintaro Matsuzawa, Akitoshi Masanao, Hirokazu Nakao1969 Volume 48 Issue 10 Pages 754-765
Published: October 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe coke oven batteries at the Mizushima Works are of Carl Still type consisting of No.1 battery, 78 (39×2) ovens and No.2 A battery, 43 ovens of 6.55m high, 15.9m long, 420mm wide. In order to acquire the data for examining the maximum productivity of coke ovens and planning the operation in the future, We made up the plan of high-rate operation test of about 170%.
Before the test, we confirmed the possibility and security of such a high-rate opera-tion by examining the brick-quality, heat control data, and the ability of the coke oven machinery, and predicting the maximum productivity of the coke ovens. The test took 16 days for No.1 batery and 36 days for No.2A battery from February to March, 1969. Operation data during the test period are as follows:
No.1A No.1B No.2A
Operating-rate (%) 169 165
Av. temp.-of flue (°C): 1, 331 (M.G.) 1, 334 (M.G.) 1, 353 (C.O.G.)
Net coking-time (hr): 13.5 13.8
Although there were some troubles during the test period as for the heat controlling and operating, we not only came through the first object, but also acquired the valuable data.
Shintaro Matsuzawa, Akitoshi Masanao, Hirokazu Nakao are, respectively, assis-tant general manager of Mizushima Works, chief of Coke Manufacturing Section, sub-section chief of Coke Manufacturing Section, Manufacturing Dept., Mizushima Works of the Kawatetsu Chemical Industry Co., Ltd., Japan.View full abstractDownload PDF (1670K) -
Bedding System and Other FacilitiesShintaro Matsuzawa, Shoziro Ito, Hiroshi Narahara, Shigeru Kuwashima1969 Volume 48 Issue 10 Pages 766-774
Published: October 20, 1969
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe new yard blending system was adopted at the Mizushima Works of the Kawatetsu Chemical Industry Company, which was attempted for the first time in the coke industry, and was put to practical use on a commercial scale. A Hewitt-Robins double wheel type reclaimer was installed, and as an excellent advantage of this bedding system, the row-mixture in each cross-section towards pile length gives little variation. However, the reclaiming mechanism cannot avoid much variation of the components in the wheel cuts, that is, the harrows moving forth and back with the wheels through the pile areas, so the scooped coal is unsuitable as blended coal to coking. Therefore, as a means of resolving this defect, a large mixing system has been developed by our own technique and installed. Consequently, in comparison with the conventional blending system, the process has been simplified, making the blending quality more stable and the blending facility easily automated. Moreover, because of the large capacity of the system, a scale effect is expected, which is considered to reduce construction and operating costs.
Otherwise it was possible to achieve a cost reduction for the stock yard system by the adoption of stackreclaimers. Those storage and reclaiming can operate smoothly the same as the conventional stacker and reclaimer system, since the travelling time is shortened. At other stations, extremely new facilities have been constructed, and with the exception of reclaiming operation at the stock yard all the facilities are controlled remotely from a central control room. Since the initial start up, all the operations have been smoothly performed and satisfactory results are being obtained.View full abstractDownload PDF (1717K) -
1969 Volume 48 Issue 10 Pages 784-788
Published: October 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (733K) -
1969 Volume 48 Issue 10 Pages e1
Published: 1969
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDownload PDF (62K)
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