All issues
Successor
Volume 46, Issue 6
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1967 Volume 46 Issue 6 Pages 443-444
Published: June 20, 1967
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (236K) -
Zenjiro Hokao1967 Volume 46 Issue 6 Pages 445-455
Published: June 20, 1967
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSThe possible application of underground gasification in Japan and some problems connected with it are now discussed by investigation committee of underground gasification. As well known this underground gasification techniques were mainly developed in Russia and now they produced gasified gas about 2500 million cubic meters per year.
They gasify coal seam by boring from the surface and their first aim is to eliminate underground heavy works in coal mines. Today many coal mines in Japan are scraped for ecconomic reasons. We discuss and propose the underground gasification of coal in scraped mines. Many scraped mines contain sufficient coal seams in which we can carry out trials of gasification. The underground gasification of coal in scraped mine requires some underground works but has also many advantages. We may call this method “underground method” compared with “surface method” in Russia.
Underground method, we are now discuss in committee, has the following advantages.
1. The boring from the surface to coal seam is not necessary and we can use the gallaries and many roads in scraped mine.
2. It is very eassy to make channel of gasification in coal seam. We can bore from the gate road to coal Seam.
3. It is eassy to transport gasified gas to the surface. We can use the pipe lines in gallaries.
We can use many technical data which obtained in Russia and we believe the und-erground gasification of coal in scraped mines in Japan will be success.View full abstractDownload PDF (1386K) -
Kenichi Azuma1967 Volume 46 Issue 6 Pages 456-463
Published: June 20, 1967
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSPossibility of the long distance pipeline operation in Japan has been investigated by a committee origanized by Agency of Science and Technology since 1964. As a member of the committee, the author referred only to the question in the pipeline enterprise on the basis of the committee's report. In this country, the pipeline has not yet been diffused and moreover there are no companies dealing mainly with the pipeline construction. Accordingly, the author discussed business problems, making several models and modifyng them. Namely, he described the following: (1) transportation by pipeline and characteristics in Japan, (2) general consideration in the pipeline business, (3) chara-cteristics in the business, (4), questions to be solved, and (5) business system in the realization of the enterprise.View full abstractDownload PDF (1301K) -
Masaichi Yamamoto1967 Volume 46 Issue 6 Pages 464-473
Published: June 20, 1967
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThis paper discribed the definition of hydro-dealkylation. Recent supply and demand for both benzene and Naphthalene in Japan was briefly stated.
Hydro-dealkylation and hydro-pyrolysis were reviewed and compared each other by means of the literatures cited. Finally details of Hydeal process for the manufacture of both benzene and naphthalene from petroleun, and also its economics were described.View full abstractDownload PDF (1274K) -
High Vacuum PyrolysisShuya Fujii, Masaaki Niimura1967 Volume 46 Issue 6 Pages 474-482
Published: June 20, 1967
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSJapanese original coals and heat treated coals were employed as samples for high vacuum pyrolysis and following results were obtained.
1. The effect of temperature was studied for Yubari coal. The yields of the distillates and gaseous products increased with increasing temperature. The ultimate analysis of distill-ates shows that the carbon content is approximately equal to that of original coal, but the hydrogen content (about 8%) is 2% higher than that of the original coal.
2. The effect of coal rank was examined with various kinds of coals, at the fixed heating temperature (500°C). The yields of distillates and gaseous products were found to be proportional to the hydrogen content and oxygen content of original coal, respectively. This suggests that each yield is influenced strongly by hydrogen or oxygen content. And in all kinds of coals, the hydrogen content of distillate is higher than that of original coal. The oxygen content of distillate is almost same with that of the residual coal, but is less than that of original coal.
The hydrogen distribution to distillate increases almost linearly with increase in hy-drogen content of original coal, while the hydrogen distribution to residual coal and gaseous products remains constant, irrespective of thehydrogen content of original coal. The oxygen distribution to gaseous products changes under the influence of the oxygen content of original coal, but those to distillate and residual coal remains constent.
3. The high vacuum pyrolysis of heat treated caol was performed under the identical condition (500°C) and the effect of heat treatment temperature was investigated. The yields of distillates and gaseous products generally decrease with increasing heat treatment temperature, though there are some exceptions. In heat treated coals, the yield of distillate also decrease curvilinearly with a decrease in hydrogen content of coal samples. However, on the contrary to original coals, the yields of gaseous products decrease rapidly with decreasing oxygen content in heat treated coals. When the atomic composition of distillate is expressed on the H/C-O*/C diagram, O*/C of distillate remains nearly constant apart from heat treatment temperature, and also agrees with O*/C of residual coal.View full abstractDownload PDF (997K) -
Minoru Shiraishi, Junjiro Kumai, Hideo Kimura, Yuji Yoshida1967 Volume 46 Issue 6 Pages 483-492
Published: June 20, 1967
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAs coke is a heterogeneous, porous and fissured solid, the adequate information concerning the mechanical properties of coke itself has not been obtained in spite of the necessity to be clarified. Such practical measures as the shatter test and drum test give little fundamental knowledge.
In the present investigation, the Knoop hardness, by which the yield stress or the plastic flow stress could be obtained in an ideal hardness test, was adopted.
Five kinds of coke-two for blast furnace, two for foundry and one for general use were cut into small square blocks at 2cm and 9cm distant from coke oven wall end, and then planes vertical and parallel to coke oven wall were polished plishad surfaces of rectangular specimens were pressed with a diamond Knoop indenter at various tempera-tures from 20°C to 1, 100°C during heating.
The trend of the Knoop hardness of five cokes to temperature was much the same, and there was little variance in hardness with kineds of coke, the orientation and the distance from oven wall end.
At a room temperature Knoop hardness number H is about 280kg/mm2, which agrees closelly with those obtained by other workers. It does not change up to 500°C, but begins to decrease slightly at 700°C. With increasing temperature from 900°C to 1, 100°C H abruptly decreases to 150kg/mm2, which is about one-half of the value at a room temperature. Young's modulus and failure stress of coke deduced from hardness number are 7.7×1010dyne/cm2, 7×109 dyne/cm2 respectively at a room temperature.
The thermal dependences of hardness is reversible under heating and cooling for all cokes except one, so that it seems the decrease of H at high temperatures is not due to the structual transformation of coke, but to the thermal energy.
From these results it is considered that coke is composed of segments which have primary bonds and are in random orientation in the mass.View full abstractDownload PDF (1106K) -
1967 Volume 46 Issue 6 Pages 498-501
Published: June 20, 1967
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (486K)
- |<
- <
- 1
- >
- >|