Abstract
Biomass gasification consists of two procedures: pyrolysis and char gasification. To better understand the influences of additives on the biomass gasification with steam, the two procedures were studied in part 1 and part 2, respectively. This paper is the part 1 of this series, where we focus on the influences of additives on the pyrolysis procedure of biomass gasification in a fixed-bed reactor. The additives used for this paper were alkali metal carbonates (Na2CO3 and K2CO3), alkaline earth metal oxides (CaO and MgO), transition metals (Ni and Fe2O3), natural ores (dolomite, olivine, and sepiolite) and clays (kaoline and diatomite). The results demonstrated that alkali metal carbonates (AMC), alkaline earth metal oxides (AEMO), dolomite, and sepiolite mainly increased the yields of permanent gases (H2, CO2, etc.) and improved the quality of gaseous product by promoting the decomposition reactions of tar and light hydrocarbon (CnHm) and the gasification reaction of char; transition metals (TM) and olivi...
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