63 Gasification reactivity of HyperCoals from lignite, sub-bituminous and bituminous coals at 650℃ under steam

概要

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HyperCoal is an extremely clean coal with ash content <500 ppm. Mulia [MUL] (C= 65.5%) a lignite coal and Pasir [PAS] (C= 72 %) a sub-bituminous coal were subjected to solvent extraction method to prepare Muria HyperCoal [MurHPC] and Pasir HyperCoal [PasHPC]. At 650℃, without catalyst both coals and HyperCoals prepared from them showed extremely slow rates. When 6 wt % K_2CO_3 was added as a catalyst to MUR, PAS, MurHPC and PasHPC, the gasification rates increased. Carbon conversion for MurHPC and PasHPC with catalyst was 99 % and 85 % in 60 min while for Mulia and Pasir coal with catalyst it was about 65 % and 60 %. These results show that addition of catalyst increased the reactivity of coals and Hypercoals in general but Hypercoals showed much higher reactivity increase than the coals with mineral. With addition of catalyst MurHPC and PasHPC showed dramatic increase in gas yield with gas composition as H_2: 55〜63 %; CO: 4〜2 %; CO_2: 40〜37 % indicating that H_2 rich gas was produced at as low as 650℃ with high production rates. The results showed that high gasification rates and reduction in gasification temperature can be achieved by using HyperCoals from low rank coals as feedstock for H_2 production by catalytic steam gasification process.
一般社団法人日本エネルギー学会の論文
2007-10-11