No.1-4 熱分解温度がチャーのガス化反応性および性状に与える影響の炭種間比較

抄録

The authours have been investigating the effect of steam injection to IGCC gasifier to achieve higher thermal efficiency. Decreased temperature in gasifier is expected by injected steam, and we clarified that gasification reactivity and char characteristics were affected by pyrolysis temperature in the experiments of a sub-bituminous coal (AD coal). In this study, the effects of pyrolysis temperature on char gasification reactivity and characteristics were compared between AD coal and a bituminous coal (KZ coal). KZ char samples with various thermal histories were prepared with DTF, and gasified under CO2 or steam condition with TGA. Gasification reactivity of KZ char prepared at lower pyrolysis temperature was higher as with the case of AD char, while the difference was limited. Char characteristics were analyzed with XRD, STEM-EDX, and XAFS. The growth of graphitization, the dispersiveness of iron in char and the chemical forms of iron in coal were different between coal types.