39 石炭熱処理におけるアルカリ金属の放出に及ぼす鉱物質添加の影響(灰付着,アルカリ金属)

概要

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In order to efficiently capture Na and K in solid during heat treatments of coal, two kinds of phyllosilicate (kaolinite and pyrophylite) were added to low-rank Yallourn and Barau coals which contained high contents of volatile H_2O-soluble and ion-exchangeable fractions of these alkali metals. By addition of kaolinite, more than 90 % of alkali metals in these raw coals remained in solid phase after pyrolysis and CO_2 gasification. For Yallourn coal, 1wt.% of kaolinite addition was enough to control K release during heat treatments. On the other hand, it was needed to add high content of kaolinite (10 wt.%) for Na capture. A possible reason was ascribed to change of H_2O-soluble Na to H_2O-insoluble at higher temperature 600〜900℃, compare to the case of K.
一般社団法人日本エネルギー学会の論文
2007-10-11