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日本エネルギー学会誌 Vol. 73 (1994), No. 3

ISIJ International
belloff
オンライン版ISSN: 1882-6121
冊子版ISSN: 0916-8753
発行機関: The Japan Institute of Energy

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21 Dec. (Last 30 Days)

日本エネルギー学会誌 Vol. 73 (1994), No. 3

エネルギーの供給と炭酸ガス

白川 精一

pp. 167-176

DOI:

10.3775/jie.73.167

抄録

The future global energy demand will increase in exponential progression especially in developing countries. On the side of supply, however, the production of its major components such as oil, coal and natural gas is estimated to reach a plateau towards the earlier half of the 21st century. The objective of the present review is to search approaches how to make up the apparent gap between this demand and supply in near future.
The leading components of energy consumption in advanced countries are fossil fuels, hydraulic, and nuclear powers; however, in developing countries, 2, 000 million people live on firewood while the rest on firewood and fossil fuels as well. Therefore, the future lack in fossil fuels and resulting price hike will lead to overgathering of firewood. This will cause an accelerated deforestation in broader area, and will result in further acceleration in environmental destruction in worldwide scale.
In order to find major countermeasures against this sort of destruction, overall survey for the possibilities is made in the following items: (1) Improvement in efficiency of energy consumption/save-energy, (2) Further promotion of nuclear power, (3) Further development of natural energy resources, (4) Forest management for prevention of its conversion to farmland or pasture ground and overgathering firewood, and (5) Further promotion of sea-food and marine biomass production, etc.
These countermeasure items are closely connected mutually; therefore, further detailed investigation may be advised into the future gross balance of demand and supply by organizing joint-study teams on each specialty and interdisciplinary areas.

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石炭の化学構造研究 (II)

濱 浩史, 村田 聡, 野村 正勝, 安達 芳雄

pp. 177-184

DOI:

10.3775/jie.73.177

抄録

Authors have previously proposed a method to evaluate chemical structure of Akabira coal by combined use of pyrolysis and solid state 13C-NMR data. This method is to evaluate distribution of aromatic compounds using pyrolysis data of its extracts. Adjustment of distribution of aliphatic and aromatic carbons was carried out by using CP/MAS 13C-NMR data of raw coal.
In this method, volatile fraction of extracts in pyrolysis is assumed to represent whole constituents of the extracts. In order to examine whether above assumption is correct or not, distribution of 9 kinds of carbons in the coal, which is comparable with those from solid state NMR measurement, was calculated based on pyrolysis data. Above calculation was carried out for Illinois No.6 and Miike coals by using several assumptions (i) all alkyl aromatics are present as methylated derivatives, (ii) isomers ratio is equivalent, (iii) non protonated aromatic carbons are included in Ar-C, and (iv) aromatic carbons next to oxygen atom in benzo- and dibenzofuran are included in Ar-O. These results were compared with that of raw coal from CP/MAS 13C-NMR. This comparison brought about relatively good coincidence between the carbon distributions of Illinois No.6 coal from pyrolysis and NMR data, while there was a little discrepancy between these carbon distributions for Miike coal. This tendency was discussed briefly.

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微量PCBを含有する燃料の燃焼時の安全性の検討

竹内 正雄, 今川 隆, 宮崎 章, 荻須 吉洋

pp. 185-193

DOI:

10.3775/jie.73.185

抄録

In order to clarify the possibility of safe utilization of insulation oil in which contained trace amounts of polychlorinated biphenyls (PCBs)- on the order of 250ppm or less-as fuel, laboratory experiments for evaluation of degradation conditions of PCBs were conducted. Oxidative pyrolysis using a flow reactor and premixed combustion of vaporized oil were performed, and products were analyzed quantitatively for PCBs, polychlorinated dibenzo-p-dioxines (PCDDs) and polychlorinated dibenzofurans (PCDFs).
Pyrolysis experiments at the conditions in which oxygen in excess revealed that the complete degradation of PCBs was attained at 973K or more. This temperature was slightly lower than the case of pure PCBs. At the condition of 923K or less, not a little PCBs were remained and PCDFs were also detected. In combustion experiments, PCBs, PCDDs and PCDFs were not detected at all experimental conditions. Because the hazardous products were not detected at the condition of short residence time after combustion, it is found that the degradation of PCBs were completed in the flame zone.

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豪州褐炭から各種熱分解法で調製したチャーのガス化反応性と諸特性値の関連性

三浦 孝一, 査 浩明, 前 一広, 橋本 健治

pp. 194-202

DOI:

10.3775/jie.73.194

抄録

The gasification reactivity of the chars prepared from an Australian brown coal, Morwell, by several methods was measured, and was correlated with several char properties. Although the chars were prepared at the same temperature of 750° under the same heating rate, the char yield, the pore surface area and the ultimate analysis varied significantly depending on the coal pre-treatment method and/or the atmosphere during the pyrolysis. The pore surface area, for example, ranged from 240 to 520×103m2/kg, and the oxygen content varied also from 8.9 to 21.6%. The gasification rate of the char prepared from a coal-methanol mixture was only one-tenth of the char prepared from the raw coal. The reaction rate of the char prepared from a coal pre-swollen with tetralin was almost similar to the reaction rate of the char prepared from the raw coal, although the char yield of the former sample was smaller than that of the latter sample by 10kg/100kg-coal. An excellent correlation whose correlation coefficient was 0.99 was obtained between the gasification rate and the oxygen content of the char. This is because the oxygen content measured in this work well corresponds to the amount of active site of the char.

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石炭液化油の酸性, 中性, 塩基性油の水素化脱窒素反応におよぼすフェノール類の添加効果

菅野 元行, 真下 清, 和井 内徹

pp. 203-209

DOI:

10.3775/jie.73.203

抄録

The liquid products derived from Miike coal were separated into weakly acidic (WA1), strongly acidic (SA1), neutral-hexane insoluble (N-HI1), basic-benzene soluble (B-BS1), and basic-benzene insoluble and dichloromethane solu-ble (B-BI1) fractions. The additive effects of phenols on their denitrogenation (DN) were investigated in detail by the hydrogenolysis reactions with a sulfided Co-Mo/Al2O3 catalyst.
Additive effect of phenol could not be observed in DN of WA1, due to the increased acidity of the catalyst caused by phenols in WA1. However, phenol addition was very effective in DN of SA1 containing only a small amount of phenols. When 7.0% of phenol was added to N-HI1, the hydrogenolysis was promoted by the catalyst of increased acidity. The adsorption of nitrogen-containing aromatic rings of B-BS1 on the catalyst surface was inhibited by the steric hindrance of long-chain alkyl groups bonded to aromatic rings. Therefore, phenol addition did not affect the DN of B-BS1. On the other hand, the DN of B-BI1, which does not have long-chain alkyl groups bonded to aromatic rings, was slightly promoted by phenol addition. Cresol isomers were as effective as phenol for the DN.

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石炭液化油の酸性, 中性, 塩基性油の水素化脱窒素反応におよぼすフェノール類の添加効果

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