各種低品位炭の回分式熱分解--生成物分布に与える原炭組成および熱分解温度の影響
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概要
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The devolatilization of various coals with carbon content between 35 and 86 wt% (d.a.f.) was performed by means of a batch reaction furnace in the range of devolatilization temperatures of 300 to 1100°C. The effects of carbon content of original coals and devolatilization temperatures on the yields and compositions of devolatilization products were examined over a wide range of reaction conditions.<BR>The composition of gaseous product is largely different between low-rank coals (lignite and brown coal) and high-rank coals (bituminous coal). The gas from the former contains a relatively large percentage of CO and CO<SUB>2</SUB>, while the latter produces the gas of a comparably high content of hydrocarbons. The temperature effect on the H<SUB>2</SUB> production has a similar dependency for all the coals employed. The gross heating value of gaseous product from low-rank coals increases with increase in temperature and reaches a constant value (about 17, 000 kJ/Nm<SUP>3</SUP>) above about 800°C. On the other hand, for high-rank coals the gross heating value decreases exponentially with increase in temperature. The yields of both CO and CO<SUB>2</SUB> have a maximum at some carbon content of coals. For example, at 1000°C the maximum was observed at about 65 wt %. Above 800°C, the char-yield is scarcely affected by the devolatilization temperature, ranging between 45 and 60 wt% depending on type of coal. The gaseous sulfur compounds evolved include not only H<SUB>2</SUB> but also SO<SUB>2</SUB>. The value of SO<SUB>2</SUB>/ (SO<SUB>2</SUB>+H<SUB>2</SUB>S) increases with decrease in carbon content of original coals.
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