Co-gasification is a promissing way to convert biomass and coal into gas fuels, which could well solve the problems normally occurring during the gasification of biomass or coal alone such as lower energy density and the pollutants emissions. Introduction of catalysts into the co-gasification system is expected to further enchance the gasfication reactivity of the blended fuels and to improve the gas products quality. This study aims to explore the influence of catalysts species and addition amount on the gasfication reactivity of the biomass/coal blends. Gasfication reactivity of the biomass/coal blends were studied using a thermogravimetric analyzer coupled with a steam generator. The results showed that, as for the catalysts of different types, Ni-based catalyst Ni(CH3COO)2 and the alkali K-based catalyst K2CO3 showed stronger catalytic role in both the co-pyrolysis stage and the mixed char gasification stage during co-gasification, while the Fe-based catalyst iron ore and the Ca-based catalyst CaO only showed a weaker catalytic role in the co-pyrolysis stage and no any significant catalytic role in the mixed char gasification stage. With regard to the potassium salt catalysts with different anions, execpt the KCl catalyst only in co-pyrolysis stage, K2CO3, CH3COOK, and K2SO4 showed catalytic role in both co-pyrolysis and mixed char gasification stage. In addition, when using K2CO3 as catalyst, the gasification ractivity of the biomass/coal blend was significantly increased with the increment of catalyst addition.

In situ catalytic co-gasification of biomass and coal: Influence of catalysts on the gasification reactivity

2019 Spring National Meeting

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