29 Reaction rates of potassium catalyzed steam gasification of HyperCoal and coal in 775〜650℃ temperature range

概要

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HyperCoal is a clean coal with ash content <0.05wt%. Oaky Creek [OC] (C=82%), and Pasir [PAS] (C=68%) coals were subjected to solvent extraction method to prepare Oaky Creek HyperCoal [OCHPC], Pasir HyperCoal [PasHPC]. Experiments were carried out to compare the gasification reactivity of HyperCoals and parent raw coals with the 20, 40, 50 and 60% K_2CO_3 as a catalyst at 600, 650, 700 and 775℃ with steam. Gasification rates of both coals and HyperCoals were strongly influenced by the temperature and catalyst loading. Catalytic steam gasification of HyperCoals was found to be chemical re action controlled in the 600〜700℃ temperature range for all catalyst loadings. Gasification rates of HyperCoals were found to be always higher than parent coals at any given temperature for all catalyst loadings. XRD results showed that microstructure of chars prepared from coals and HyperCoals were similar. NMR results show no significant difference between the chemical compositions of the chars. SEM images showed that chars from HyperCoals had coral-reef like structures while dense chars were observed for coals.
一般社団法人日本エネルギー学会の論文
2008-10-09