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Volume 47, Issue 4
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[in Japanese]1968 Volume 47 Issue 4 Pages 225
Published: April 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (263K) -
Takezo Obata1968 Volume 47 Issue 4 Pages 226-237
Published: April 20, 1968
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSIt was reported by Nihon Keizai Shinbun on Jun. 1st of this year, gross national production rate per unit area in Japan was over eight times of that in U. S. A. So we can say, amount of the pollutants which produced by the production would be over eight times of that in U. S. A. From these facts, it we hope to keep our surroundings as U. S. A., we must do our best to controll the pollutions, and to endeavor over eight times of that American do.
For the illustration of the status of the pollution controll, here I have reviewed the trends of the research and the development of the technique for “ Petroleum Refining and Petro-Chemical Waste Water Pollution and its Treatment ” from the Japanese Patents Government Publication and foreign literatures.
From these facts and figures, we can not to say the activities of the research in this field in Japan are prosperous than that in foreign countries.View full abstractDownload PDF (1325K) -
Kazuo Akita1968 Volume 47 Issue 4 Pages 238-246
Published: April 20, 1968
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe mechanism of flame extinction is classified into three groups of (1) quenching due to heat loss (thermal effect), (2) quenching based on flammability limits (chemical effect), and (3) quenching by flame stabilizing limit (aerodynamic effect), and the foundamental problems of each mechanism are discussed from a stand-point of combustion physics and chemistry. In first group, the utilization of heat dissipation due to solid surface such as wire gauze, inert powder and porous metals, and the latent heat of li iuid vaporization are dealt with, in second group, the limits of inflammability of fuel-air mixtures and the effect of additives as inert gases and inhibitors are main subject, and in last group, the possibility of using the blow off of flame by high speed air flow is discussed.
In particula, author spends much space for the combustion inhibiting effect of halogenated hydrocarbons and alkali metal salts under expectation of appearance of more effective method for fire extinction.View full abstractDownload PDF (1271K) -
Course of Formation of Coke Balls in a Rotary RetortSeiichi Nomura1968 Volume 47 Issue 4 Pages 247-258
Published: April 20, 1968
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESS(1) The course of formation of coke balls in a rotary retort (200mm∅×180mm) by low temperature carbonization with and without passing air stream, was observed. Samples examined were as follows: Miike coal-Tagawa senseki, Yubari coal-Sunagawa low temperatue coke, Yubari coal-Ashibetsu coal and Yubari coal-Sunagawa coal.
(2) When coal was carbonized without passing air stream, it was found that the charged coal which was heated to it's melting point, was changed wholly into mushy state and when it was held to a certain height, it failed down by it's weight along the retort wall. And when carbonization advanced and coal approached it's solidifing point, fluidity of coal decreased and coal paste was devided into several small pieces or was bended itself or such small piece was held by bended coal paste and then they started tambling in the rotary retort, some pieces of them adhered each other and formed a larger ball, which was solidified gradually.
When caking power of the charged coal was too high, the coke ball obtained had tendency to break into several pieces on cooling.
With the decrease of caking power (for example, as the caking coal was mixed with natural coke or coalite) the coke ball formed became smaller and the time of formation of coke balls was shortened.
(3) By passing air stream into a rotary retort, the time of formation of coke balls was shortened and as the flow rate of air increased, the coke balls formed became smaller.
Decrease of the size of the coke ball was observed by passing air stream in every period including not only the powder period, but also the plastic period and the coke ball forming period.
(4) Observation of the section of the coke ball revealed that the coke ball was made of several small soft coke pieces adhered each other or of a coke ball held with other soft coke.
(5) Analytical data of several portions of single coke ball gave the information that carbonization of coal substance proceeded rather evenly throughout the every portion of the coke ball formed.View full abstractDownload PDF (2538K) -
Masaki Horioka1968 Volume 47 Issue 4 Pages 259-264
Published: April 20, 1968
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSMany hot corrosions of marine engine have been experienced in C fuel oil operation. This oil has approximately 40-400 p.p.m. vanadium, 50 p.p.m. Na and 3 3.5 wt % sulphur.
This paper describes on “because of hot corrosions, how to prevent these troubles and how to assure proper corrosions controll”.
Controlling factors for its corrosive effect are deposits on metal surfaces (V2O5, Na2SO4, SO3), elevated temperature (500 to 700°C), pulsating combustion pressure and so on.
Corrosion experimental tests were carried on 2 austenitic steels (14Cr-14Ni-2W and 17-4PH), 3 ferritic steels (2Si-11Cr-1Mo, 1Cr-1Mo-1/4V and 1Cr-1/4Mo) and 3 facing alloys (45Co-33Cr-18W, 65Co-28Cr-4W and 29Cr-39Ni-15W-10Co). Corrosion tests results on various alloy at 600°C and V2O5 90 wt % and Na2SO4 10 wt % are as follows. 2 austenitic steels, 1 ferritic steel 2Si-11Cr-lMo and 1 facing alloy 29Cr-39Ni-15W-10Co are relatively protective to vanadium attack. 2 facing alloys (45Co-33Cr-18W and 65Co-28Cr-4W) are the most corrosive.
Aluminized process to develop Al-Fe alloy layer on each steel surfaces are experimentally confirmed to be protective to vanadium attack as well as to minimize oxidizing loss and strengthen fatigue resistance at elevated temperature, if proper materials to aluminized process are selected.
12 aluminized exhaust valves (6; 14Cr-14Ni-2W and 6; 2Si-11Cr-lMo) were used on actual marine service to assure corrosion controll.
Besides proper material selection to corrosion, creep and strength and aluminized process to develop Al-Fe alloy layer, a program of deposits cleaning and recoating on metal surfaces after a marine service are recommended to assure proper corrosion controll of marine engine.View full abstractDownload PDF (1188K) -
Toyohiko Yamasaki1968 Volume 47 Issue 4 Pages 265-271
Published: April 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn this paper it was introduced to peacefully utilize underground atomic nuclear explosions which had been started in New Mexico, 1967. Now, the five projects have been developed in U. S. A. However, those projections are highly speculative and open to serious questions for practice.
World Oil informed to discuss the such speculations and questions.
Journal of Petroleum and Quarterly of Colorado School of Mines had reported about recovering oil from nuclear chimney retort and current Coal Age published a Thunderbird Project which was a nuclear trigger for coal gasification.View full abstractDownload PDF (1086K) -
1968 Volume 47 Issue 4 Pages 277-279
Published: April 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (363K)
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