95.亜/超臨界水処理による低炭化度炭の改質

概要

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A low rank coal (North Dakota, Beulah-Zap seam) was treated by sub/supercritical water and atmospheric nitrogen at 200〜500℃. Then the treated coals were gasified in an air atmosphere. The gasification reactivities of the coals treated by sub/supercritical water could be varied by changing the treatment temperature and time, whereas those of the coals treated by atmospheric nitrogen were not significantly different from the gasification reactivities of the raw coal. From the X-ray analysis, calcium in coal was found to be crystallized to form CaCO_3 during sub/supercritical water treatment to lose the catalytic activity for gasification. It was also found that the structural change of coal brought about by sub/supercritical water treatment affects the gasification reactivities.
一般社団法人日本エネルギー学会の論文
1998-11-19