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Volume 69, Issue 5
Displaying 1-13 of 13 articles from this issue
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[in Japanese]1990 Volume 69 Issue 5 Pages 319
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (212K) -
Kyosuke MATSUI1990 Volume 69 Issue 5 Pages 320-327
Published: May 20, 1990
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSApproximately 60% of the total power generating capacity in Japan is occupied by fossil fuel-fired power plants.
As such, it is highly important that these plants be efficiently used so as to meet the present and future load-growth requirements.
To maintain the reliability and performance of these plants, it is required to inspect the equipment and assess the remaining life of the plants in a strict manner.
Moreover, the maintenance and improvement of plants through this assessment is a vital factor in assuring the stable supply of electricity.
This report describes the content of regular inspection, current status and items pertaining to the remaining life assessment on fossil fuel-fired power plants.View full abstractDownload PDF (1102K) -
Makoto HAYASHI1990 Volume 69 Issue 5 Pages 328-334
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSafety is especially essential in gas utility. For safety of gas, Tokyo Gas has developed intelligent gas meter as a means off fail-safe-system. It shut the gas off when the gas flow is extremely large or continues for an abnormally long period. And now, for improvement of safety and convenience of gas appliances, Tokyo Gas has developing new 24 hours security services and supervision systems, which we call “Intelligent Service Systems”. “STATION 24” -the 24 hours monitoring center of Tokyo Gas -monitors customer's various gas appliance, such as Security-Systems and intelligent gas meter, by use of computer and telecommunication technologies. In case of troubles emergency, the terminals at customer site make a phone call automatically and send emergency information to STATION 24. As soon as information is displayed on screen, operators call customers back and send repairs out immediately from local branch office of Tokyo Gas if necessary.
“Intelligent Service System” guards customer's safety over the 24 hours.View full abstractDownload PDF (792K) -
Atsushi MIYAKAWA1990 Volume 69 Issue 5 Pages 335-342
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSafety operation is of vital importance to many engineers in the petroleum refinery industry. In this paper, we describe our basic conception of advance in plant reliability and shutted down maintenance methods. On stream inspection is regarded as of major importance nowadays. And we will outline a few of actual technique. For example, radiography testing, monitering system, acoustic emission.View full abstractDownload PDF (1079K) -
Masashi NAKASHIRO1990 Volume 69 Issue 5 Pages 343-354
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIt is very popular NDE technology to detect the defects of structure material by ultrasonic techniques. But, it is need to develop the newly ultrasonic technique to assess the micro damages such as cavities and micro cracks in creep, fatigue and creep-fatigue damages. Recently, the assessment for these damages by ultrasonic techniques have been developed by many research organizations. This report are described the newly ultrasonic techniques to assess the material degradation by creep and fatigue etc.View full abstractDownload PDF (1349K) -
Relation of the Plastometric Indices to the Agglomerating Conditions of Coal ParticlesToshihiro ARAMAKI, Yoshiaki MIURA, Mitsuhiro SAKAWA, Yoshihisa SAKURAI1990 Volume 69 Issue 5 Pages 355-360
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbonized contact layer of two kinds of coal particles was investigated by polarizing microscope from the view point of its cohesive strength, and the following results were obtained.
1) Contact conditions after carbonization were classified microscopically as follows: cohesive contact (diffusive or non-diffusive) and brittle contact (fissile or porous).
2) It was found that the contact conditions of coal particles depended on the caking indices by Gieselar plastometer.
These relationships could be shown by MF1 (maximum fluidity of test coal) and ΔST (difference of the solidification temperature of two kinds of coal) diagrammatically.
3) Small ΔST is the necessary condition for good cohesive contacts.
4) The larger the ΔST is, the weaker the strength of the contact zone is. In this case, larger MF1 is the necessary condition for good cohesive contacts.View full abstractDownload PDF (2439K) -
Hiroyuki KAWASHIMA, Yasumasa YAMASHITA, Mamoru KAIHO, Mitsuo KOBAYASHI ...1990 Volume 69 Issue 5 Pages 361-371
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSOxidative reforming of coal liquefaction residues was performed for two samples (Illinois No.6 and Yallourn coal liquefaction residues) at 150-290°C to change some physical constants to adequate values for the gasification in a coal gasification reactor. These physical constants (softening point and fluidity) and reactivities (pyrolysis and reaction with CO2) were also investigated. As the oxidation proceeded, softening points increased gradually and fluidities decreased for both samples. Adhesion forces decreased with oxidation and reached the value of original coal at 290°C for 0.5h for both samples. Pyrolysis reactivity was decreased by oxidation. Reactivity with CO2 increased for the Illinois No.6 liquefaction residue and decreased for the Yallourn liquefaction residue. To obtain information on structural changes during oxidation and their relation to properties and reactivities, FT-IR spectra of the samples were taken. Aliphatic and aromatic structures in the Illinois No.6 liquefaction residue decomposed and some carbonylic and hydroxylic functionalities were formed. Aliphatic structures in the Yallourn liquefaction residue decomposed and some carbonylic, ester and ethereal crosslinks were formed. Properties and pyrolysis reactivities were changed by formation of oxygen-containing functional groups. The difference of reactivity with CO2 in the two samples was due to the difference in structural change caused by oxidation.View full abstractDownload PDF (3832K) -
The Effect of Hydrogenation Catalyst at the First StageKeiji MIKI, Yoshitaka YAMAMOTO, Tohru KAMO, Atsushi INABA, Yoshiki SAT ...1990 Volume 69 Issue 5 Pages 372-377
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTo investigate the feasibility of nondistillable bottom recycle for the enhancement of liquid yields, two stage liquefaction of Yallourn and Taiheiyo coals were conducted using NiMo/Al2O3 with red mud at the first stage.
Over successive passes, high coal conversion (>96wt%) at the first stage was maintained, and yields of gas and THFI were not increased. It was also indicated that 60wt% of both coals were converted to cyclohexane solubles at the initial stage accompanied with the promoted conversion of coal and/or cyclohexane insolubles. The improvement of conversion and product selectivity seems to be related with the changes in quality of recycle solvent in terms of the efficiency of hydrogen transfer reaction, and with the removal of hetero compounds causing the regressive reaction.
The above results suggest the possibility of highly efficient conversion of organics inherent in both brown and subbituminous coals to liquid products.View full abstractDownload PDF (699K) -
Jun-ichiro HAYASHI, Makoto ANDO, Toshiki MAEZONO, Katsuki KUSAKABE, Sh ...1990 Volume 69 Issue 5 Pages 378-384
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFlash pyrolysis of two bituminous coals (Pittston, Optimum) in a free fall reactor was studied at the temperature of 700-1200K. The structure of tar was determined by 1H NMR, and the number-average molecular weight and the molecular weight distribution were measured by means of VPO and GPC.
The tar yield reaches the maximum value at 900-950K for both coals. The aromaticity increases monotonously with an increase in the pyrolysis temperature, which is due to the elimination of aliphatic peripheral groups occurring below 973 K. At higher temperatures, the change in the structure unit is caused by the condensation of aromatic ring.
The calculated molecular weight of a structure unit agrees with the number-aver-age molecular weight of tar obtained by VPO. This indicates the tar mainly consists of 1-2 structure units. The molecular weight distribution of tar is hardly dependent on the pyrolysis temperature in spite of the elimination of aliphatic groups below 900 K. However, the distribution shifts toward the lower molecular weight range above 900 K, which is properties of γ fraction in char are very similar to those of the low temperature tar, and little structural change is observed in the range of 800-1100K.View full abstractDownload PDF (749K) -
[in Japanese]1990 Volume 69 Issue 5 Pages 385-391
Published: May 20, 1990
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSDownload PDF (934K) -
[in Japanese]1990 Volume 69 Issue 5 Pages 394
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (136K) -
[in Japanese], [in Japanese]1990 Volume 69 Issue 5 Pages 395
Published: May 20, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (126K) -
1990 Volume 69 Issue 5 Pages 398
Published: 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (100K)
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