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Volume 58, Issue 3
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1979 Volume 58 Issue 3 Pages 183-184
Published: March 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (335K) -
Susumu YOKOYAMA1979 Volume 58 Issue 3 Pages 185-202
Published: March 20, 1979
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSCoal liqids consist of a complex mixture of compounds that contains saturate and aromatic hydrocarbons and polar compounds containing oxygen and nitrogen, with their molecular size varying broadly . It is very important to elucidate the chemical structure of coal liquids derived from coal liquefaction in order to utilize them properly as raw material for chemical industries, fixing the conditions required for the products desired .
In this review, recents studies about the separation procedures and characterization of products for example molecular size, compound types and aromatic groups are described. Predominantly, 13C- and 1H-NMR spectroscopy are powerful tools for estimation of the average structure of product. Besides that, mass spectroscopy is also useful procedure for obtaining compound type and the distribution of carbon number for their analogous series.View full abstractDownload PDF (2283K) -
You SAITOH, Teruaki ISHII1979 Volume 58 Issue 3 Pages 203-211
Published: March 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to establish the rapid method for analyzing carbon, hydrogen and ash in fuel, the improved method have been studied. The analytical procedure is as follows. A sample (200-300mg) on boat is gradually incinerated up to 800°C in helium gas using the newly-devised apparatus. The produced gas is passed through needled copper oxide heated at 800°C and oxidized completely. The atmosphere in the tube is changed from helium gas to pure oxygen gas (the purity is more than 99.99%) and the sample is burned completely, and the occured CO2 and H2O are absorbed to the absorbers with soda asbestoes or anhydrone res-pectively. Then carbon and hydrogen are determined by means of weighing the increased weight respectively. Also ash is determined by means of weighing the combustion residue. Analytical time is only 17 minutes, and analytical precision is equal to that of JIS method (Liebig method).View full abstractDownload PDF (1074K) -
Yoneshiro TAZAKI, Junichi KAWABATA1979 Volume 58 Issue 3 Pages 212-218
Published: March 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCoal char particles were successfully burnt in a fluidized bed of silica sand particles whenever both particles were mixed well and char particles were gasified by steam in a sand-free bed without agglomerate formation under conditions of low oxygen concentration.
A horizontal perforated plate was used to devide the fluidized bed into two stages. When the mixture of char and silica sand particles was fluidized in the two-stage fluidized bed, only a small amount of char particles was fluidized within the sand bed while larger amount in the upper stage.
The two-stage gasifier, therefore, was composed of combuster where the char was burnt by air in the bed of silica sand particles, providing the process heat, and a gasifier where char was gasified by steam, producing low-heating-value gas. Coal char particles were fed continuously to the lower stage of the bed and ash particles were discharged from the upper stage.
Experimental data were reported on the carbon gasified, heat conversion and exit gas composition. Results of continuous ash removal tests were also examined briefly for a three-stage fluidized bed gasifier.View full abstractDownload PDF (765K) -
Senji HONMA, Junichi KAWABATA, Midori YUMIYAMA, Yoneshiro TAZAKI, Shoh ...1979 Volume 58 Issue 3 Pages 219-224
Published: March 20, 1979
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSA single-stage pressurized fluidized bed gasifier was developed for producing low-heating-value gas from coal.
Coal char was gasified by air-steam mixture at temperatures of 880 and 950°C and at pressures of 3, 5 and 7kg/cm2G. At the higher temperature of 950°C, char was gasified in the bed of silica sand particles in order to prevent ash agglomeration.
Experimental data were analyzed on carbon conversion and the heating value of produced gas. The through-put of char was determined from the feed rate of air and the operating temperature.
It was found that increase in operating pressure causes the elutriation of fine dusts from the gasifier.
From the present experimental work several information was obtained useful to improve an overall process design.View full abstractDownload PDF (790K) -
Iwao MATSUMOTO, Tadato YAMAMOTO1979 Volume 58 Issue 3 Pages 225-234
Published: March 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFollowing are the results of obtained from the study on the characteristics of the power output and exhaust gas emission of gasoline mixed with C1-C8 alcohols by engine test method.
(1) Almost the same maximum power output as normal gasoline was observed when ratio of excess air was set a little higher value
(2) The content of CO, hydrocarbon and aldehyde in the exhaust gas was decreased in the above condition wihch may due to higher ratio of excess air setting.
(3) Ratio of excess air did not affect the power output so much as in normal gasoline.
(4) Such effects described from (1) to (3) were more significant when lower alcohols such as C1-C4 were added.
(5) Some deterioration of starting performance was observed when 35% of front and was substituted by C1-C4 alcohol mixture.View full abstractDownload PDF (1060K)
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