No.28 熱分解チャーの燃焼過程におけるフッ素の脱離と濃縮(灰・微量元素(3))

概要

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The fate of char-F in the fixed bed combustion of six pyrolyzed chars has been examined with a quartz reactor at 1000°C. HF formation starts after the apparent completion of CO_2 evolution with all chars. The yield after 8 h combustion is in the range of 13 to 45 %, and it is larger for the chars with higher burn-off of 93-94 %. The XPS spectra for the chars with HF yields of 30-45 % give the distinct F 1s signals, which can be identified to inorganic and organic fluorine, the proportion of the latter being as large as 70-80 mol%. A model experiment shows that HF can react with pure carbon without any minerals at 950°C. It is thus possible that part of HF evolved from char-F may react secondarily with unburned carbon remaining in ash after combustion to be transformed into organic C-F forms.
2010-09-21