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Volume 60, Issue 2
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1981 Volume 60 Issue 2 Pages 75
Published: February 20, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (228K) -
Teruo NOZAKI1981 Volume 60 Issue 2 Pages 76-94
Published: February 20, 1981
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSAs a result of the Bali meeting of OPEC nations at the end of 1980, the era of US $40 per barrel crude is now at hand.To make matters worse, the increased de-mand for middle distillates and decreased demand for heavy fuel oil due to the conversion of land-based industries to alternative energy sources will result in increased processing of heavy fuel.
From the view point of operating economy, diesel engines will continue to be the main means of marine propulsion for another 20 years.However, it will be necessary to use low quality heavy fuel produced by cracking processes.
This paper discuss the trends of marine bunker fuel oil toward higher viscosity and lower quality and problems anticipated because of the use of such low quality fuel.View full abstractDownload PDF (2396K) -
Junkichiro DAI1981 Volume 60 Issue 2 Pages 95-105
Published: February 20, 1981
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSThe mass balance relation of hydrocarbon fuel combustion accompanying carbon formation is considered in the present paper.X and z denote the mole fraction of carbon dioxide and carbon presented respectively.
It is assumed that the hydrogen in the fuel is completely converted into water.
In order to represent the performance of combustion, the solid figure of isosceles prisms is employed.
The patterns of stoichiometric and partial theoretical air planes have similar trends to those in the foregoing report.
In general, concentration surfaces of oxygen and nitrogen shift towards the right as excess air ratio increases.
When hydrogen-carbon ratio is more than 2, the nitrogen surface of dry products removes to the left as excess air increases.
On the specified plane of nitrogen, it should be noted that, in these states, the group of particular lines which is independent of excess air forms identical plane.
It will be found that, with the increase of feed air, carbon dioxide or monoxide surface gradually approaches towards the x-z plane.
The maximum difference among the constituents concentration for dry and wet products, has a trend to obtain the same value in foregoing report, but in this paper this trend is confirmed in the very wide range of fuels.
The series of alignment charts have been constructed by giving the fuel composition.
This is a weak point in regard to the treatment.View full abstractDownload PDF (1196K) -
Toshio SATO, Kinji HAMAMURA, Sadayoshi KANBARA1981 Volume 60 Issue 2 Pages 106-110
Published: February 20, 1981
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe reduction of aromatic nitroso compounds (Ar-NO) by hydrosulfide to N-hydroxylamines (Ar-NHOH) has been studied kinetically in aqueous media.In this reaction hydrosulfide is oxydized to sulfur by Ar-NO, and Ar-NO is Ar-NO +H2S→Ar-NHOH+S converted into unstable products (Ar-NHOH) which regenerated the original nitroso compounds by bubbling oxygen through the solution.This process has been successfully utilized for the desulfurization of fuel gas containing hydrogen sulfide.
The reduction rate of Ar-NO was accerated by the addition of polysulfide, and that polysulfide is responsible for autocatalytic nature of the reduction.The rate was found to be proportional to the concentration of Ar-NO, hydrosulfide and hydronium ion.The effect of temperature obeyed the Arrhenius equation.View full abstractDownload PDF (564K) -
Shigeru MORIKAWA, Kazumasa TAKAHASHI, Satoru KURITA1981 Volume 60 Issue 2 Pages 111-116
Published: February 20, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe catalytic activities of CaO, CaCO3, CaSO3 and CaSO4 for the reduc-tion of nitric oxide with carbon monoxide were studied. The CaO and CaCO3 catalysts showed the highest activity in the reduction of NO with CO, that is, more than 90% NO conversion at 700°C under the following conditions: CO/O2 2.0 (mole ratio), space velocity=6000 vol/ vol/hr. The catalytic activity of the CaO catalyst was not affected by the space velocity (<30000 vol/vol/hr) and the concentration of SO2 (<500 ppm). A. catalyst whose composi-tion is 50% CaO and 50% CaSO4 remained the NO conversion of CaO.View full abstractDownload PDF (756K) -
Yoneshiro TAZAKI, Shohei TAKEDA, Midori YUMIYAMA, Senji HONMA, Kunihir ...1981 Volume 60 Issue 2 Pages 117-120
Published: February 20, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSProperties of coal ash as well as fine dust were analyzed and studied.Coal char was fed continuously to the bed and gasified by air-steam mixture in pressurized fluidized bed gasifier with an inner diameter of 75mm.
Coal ash was over-flowed from a pipe which was situated at 300 mm from the gas distributor. Fine dust was removed by cyclone and gas purifier.
Produced rate, size distribution, proximate analysis, ultimate analysis and chemical analysis of ash and dust were studied.Especially, chemical analysis of over-flow ash was compared with that of fly ash generated by electric power plant using coal.View full abstractDownload PDF (566K) -
Yoshihiro OGISU1981 Volume 60 Issue 2 Pages 121-127
Published: February 20, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAs an example of practical combustors, the pot type burner and the premixed gas burner were studied.The relations between the level and the spectrum or combustion noise from these types of combustor and the condition of combustion were studied experimentally, and three suggestions for the low noise burner were shown as follows.
1) to burn in premixed
2) to use smaller and many ports, distributed in three-dimentional position
3) to use strong flame holding system (As the bluff body causes excessive turbulence, pilot burner type flame holding is favourable.)View full abstractDownload PDF (885K) -
Hiroshi UCHIDA, Daijiro TERASAKI, Takashi KOJIMA1981 Volume 60 Issue 2 Pages 128-133
Published: February 20, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe liquid redox desulfurization using acid aqueous solutions has been studied in a cyclic desulfurization apparatus for 0.5Nm3/hr gas at pH 2.2-5.1.The experi-mental results indicated that most part of the removed hydrogen sulfide is oxidized to sulfur at the desulfurization.Accordingly, it was found that the consumption of alkaline chemicals to the desulfurization decreases markedly.The experimental results using various catalysts showed that chelates such as Fe (III)-NTA and Fe (III)-EDTA are marked high actived catal-ysts.Furthermore, the addition of organic solvents such as diethylene glycol monobuthyl ether and ethylene glycol monoethyl ether into the acid aqueous solution effects higher desul-furization coefficiency.View full abstractDownload PDF (845K)
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