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Volume 47, Issue 2
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1968 Volume 47 Issue 2 Pages 79
Published: February 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (254K) -
Akira Iwama1968 Volume 47 Issue 2 Pages 80-97
Published: February 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe state of technology of rocket propellants has taken great strides in the last decade. Developments of new materials and new processes for manufacturing rocket engines are many important contributions by chemical investigators and engineers.
This review deals with the major functional constituents for preparing composite and double-base solid propellants, and discusses the general trends of liquid and hybrid proplellants. The trend to higher combustion temperatures and chamber pressures has emerged as a result of higher energy propellants. Considerable progress has been made to improve the combustion stability by formulating new materials.
A new growing branch of rocket propellants for use in microrocket or microthrust engines is also described.View full abstractDownload PDF (2728K) -
Hiroshi Nishimura, Iwao Osoegawa1968 Volume 47 Issue 2 Pages 98-106
Published: February 20, 1968
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSUtilization of coal ash produced from power station has rapidly progressed in Japan.
The coal ash from dry bottom boilers is divided in following three divisions.
(a) Fly ash-Elective precipitator.
(b) Fly ash-Multi cyclone.
(c) Coarse ash-Bottom economizer and air heator.
(a) is mainly provided to the fly ash cement and pozzolan material. This supply amounted to 645, 162 _??_ per year in 1966.
Authors touched on various pozzoran effects of fly ash in this treatise.
(b) is mainly provided to farms as a special fertiger that is named Green Ash.This supply amounted to 81, 236 _??_ per year in 1966.
(c) is mainly utilized as a road-bace stabilizer that is named Coal Sand. We have reserched the fundamental workability of each Coal Sand rejected from several power station, Kyusyu Electric Power Co. Ltd. and obtained Satisfactory results. In recent 2 years, we have supplied about 100, 000 m3 of Coal Sand to Kyushu district.View full abstractDownload PDF (1462K) -
Toshiya Shibata, Nobuo Ekinaka, Yuji Matsumura1968 Volume 47 Issue 2 Pages 107-115
Published: February 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn the town-gas industry, the combustibility of fuel gas has been characterized with the relative quantities corresponding to maximum burning velocity of fuel gas.
The relation between its quantities and the maximum burning velocity of fuel gas is, however, not obvious for the fuel gases composed of many components. To make sure of this relation. it was attempted to calculate: the maximum burning velocity as a function of gas compositions under a certain theoretical consideration.
The derivation process of the calculation formula is shown in this paper with systematic measurements of the maximum burning velocity for the gas mixtures.View full abstractDownload PDF (943K) -
Gen Takeya, Tadao Ishii1968 Volume 47 Issue 2 Pages 116-128
Published: February 20, 1968
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSRecently chemical reactor design together with studies on operation have been directed toward the physical aspects of reactor such as optimization, reactor dynamics and the transport phenomena. However, we are of the opinion that studies on the chemical reaction itself is an equally important facet of the problem, and the design of industrial reactors can not be attempted without reliable rate data. This would also apply to the field of coal chemistry in spite of the complexities of coal structure and chemical reactions of coal. The term macrokinetics in the title is concerned with the rate of reaction under technical conditions.View full abstractDownload PDF (1785K) -
Reijiro Yamamura1968 Volume 47 Issue 2 Pages 129-136
Published: February 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn Ohio, U. S. A., it succeeded to transport coal slurry by long pipe line for the first time in the world. After industrializing, they have continued every kinds of studies and improvements on this operation.
In other countries, also, the researches have been made on transportation and utilization of coal slurry.
This paper describes above next three problems of these studies:
1) Counter plan to the corrosion achieved on the pipeline. It is very important problem in the economical point of view. In U. S. A. they have successfully reduced the inhibitor cost one tenth by the long term study.
2) Control system of coal slurry transportation. There are more difficulties in coal slurry transportation than the other liquids transportation. These problems have been solved in U. S. A., and the control system of the pipeline has been completely automated.
3) Direct burning of coal slurry. In a German power station, it was accomplished by improving of oil burners of usual boiler.View full abstractDownload PDF (1310K) -
1968 Volume 47 Issue 2 Pages 141-146
Published: February 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (803K)
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